Re: Next release for clojure.tools.cli? Is it dead?
On Thu 23 Jul 2015 at 09:33:13PM -0700, Keith Irwin wrote: There are some handy additions committed to the tools.cli project at: https://github.com/clojure/tools.cli but there hasn’t been a release in ~1.5 years (not even a snapshot release). In fact, these commits have been sitting there for over a year. I’m especially interested in this one: http://dev.clojure.org/jira/browse/TCLI-9 Any chance of a new release? Sean Corfield has volunteered to be the new maintainer of tools.cli, and knowing Sean, there will likely be a new release very soon. Sung Pae -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. signature.asc Description: PGP signature
Re: Twitter bot crashing on Heroku
Are you actually binding to a port? I didn't find it in your code. If you don't bind to the PORT env variable, heroku will fail. If you have a bot you may not need to bind to a port... but heroku needs that on the default web dynos. Don't know if you can skip that validation. On Mon, Jul 27, 2015 at 12:08 PM, Gary Verhaegen gary.verhae...@gmail.com wrote: Just peeked at your code, and it seems to indeed compile everything at startup. I'm not quite remembering all of the details, but I remember that Chestnut got it right: on Heroku, you can set things up so that an uberjar is created on git push and then started with java -jar on startup, which is usually much faster. See for example: https://github.com/plexus/chestnut/blob/master/src/leiningen/new/chestnut/Procfile I *think* it was enough to declare an :uberjar-name entry in the prpject.clj to trigger that behaviour on Heroku, but I am not quite sure. You'll have to experiment a bit (or hope someone else can answer more definitely). On Monday, 27 July 2015, Gary Verhaegen gary.verhae...@gmail.com wrote: the error message also sugget that your process may not have started quickly enough. How do you deploy on heroku? Do you have a Procfile? What does it say? Do you prepackage on push, or recompile everything on startup? On Monday, 27 July 2015, Divyansh Prakash divyanshprakas...@gmail.com wrote: Hi! I had written a poetry generator http://yushing.herokuapp.com/ sometime back and wanted to convert it into a Twitter bot. I followed this tutorial https://howistart.org/posts/clojure/1 to do so. You can find my code here https://github.com/divs1210/yushing-bot. The bot's working fine from my local machine, but sporadically crashes on Heroku with the following message: 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Error R10 (Boot timeout) - Web process failed to bind to $PORT within 60 seconds of launch 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Stopping process with SIGKILL 2015-07-27T10:23:07.550373+00:00 heroku[web.1]: Process exited with status 137 2015-07-27T10:23:07.561392+00:00 heroku[web.1]: State changed from starting to crashed Some answers on SO suggest that this is because Heroku already provides a port to bind to and I might be trying to bind to some other port, but this is not the case. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- Pedro Santos Home - http://psantos.zi-yu.com -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Twitter bot crashing on Heroku
the error message also sugget that your process may not have started quickly enough. How do you deploy on heroku? Do you have a Procfile? What does it say? Do you prepackage on push, or recompile everything on startup? On Monday, 27 July 2015, Divyansh Prakash divyanshprakas...@gmail.com wrote: Hi! I had written a poetry generator http://yushing.herokuapp.com/ sometime back and wanted to convert it into a Twitter bot. I followed this tutorial https://howistart.org/posts/clojure/1 to do so. You can find my code here https://github.com/divs1210/yushing-bot. The bot's working fine from my local machine, but sporadically crashes on Heroku with the following message: 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Error R10 (Boot timeout) - Web process failed to bind to $PORT within 60 seconds of launch 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Stopping process with SIGKILL 2015-07-27T10:23:07.550373+00:00 heroku[web.1]: Process exited with status 137 2015-07-27T10:23:07.561392+00:00 heroku[web.1]: State changed from starting to crashed Some answers on SO suggest that this is because Heroku already provides a port to bind to and I might be trying to bind to some other port, but this is not the case. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure@googlegroups.com'); Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com'); For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com');. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Twitter bot crashing on Heroku
Thanks for the response, everyone. My Procfile says: worker: lein trampoline run I'm not binding to any port because my app doesn't require it. How do I do so, though? Will it be available as a part of lein-environ? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Twitter bot crashing on Heroku
Hi! I had written a poetry generator http://yushing.herokuapp.com/ sometime back and wanted to convert it into a Twitter bot. I followed this tutorial https://howistart.org/posts/clojure/1 to do so. You can find my code here https://github.com/divs1210/yushing-bot. The bot's working fine from my local machine, but sporadically crashes on Heroku with the following message: 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Error R10 (Boot timeout) - Web process failed to bind to $PORT within 60 seconds of launch 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Stopping process with SIGKILL 2015-07-27T10:23:07.550373+00:00 heroku[web.1]: Process exited with status 137 2015-07-27T10:23:07.561392+00:00 heroku[web.1]: State changed from starting to crashed Some answers on SO suggest that this is because Heroku already provides a port to bind to and I might be trying to bind to some other port, but this is not the case. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
WebService request are not getting served properly
On running the below mentioned code on browser I am getting Page not
found for each type of request.
Can anybody suggest me where I am doing a mistake.
(ns currentday.core
(:require [compojure.core :refer :all]
[compojure.route :as route]
[compojure.handler :as handler]
[ring.middleware.defaults :refer :all]
[ring.util.response :refer :all])
(:use ring.adapter.jetty))
(defn now []
(new java.util.Date))
(defn say-hello []
Hello!! everyone. I am home page of webservice.)
(defn date-is [req]
Today's date is: (str (now)))
(defn get-date [req]
(- (response (date-is))
(content-type text/html)))
(defn add-data [a b]
(- (response Sum of two no. is: (str (+ a b)))
(content-type text/html)))
(defn sub-data [a b]
(- (response Subtraction of two no. is: (str (- a b)))
(content-type text/html)))
(defroutes my-routes
(GET / [] Hello)
(GET /date req (get-date [req]))
(GET /add/:a/:b [a b] (add-data a b))
(GET /sub/:a/:b [a b] (sub-data a b))
(route/not-found Page not found))
(def app
(handler/site my-routes))
(defonce server (run-jetty #'app {:port 3032 :join? false}))
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Re: Twitter bot crashing on Heroku
Just peeked at your code, and it seems to indeed compile everything at startup. I'm not quite remembering all of the details, but I remember that Chestnut got it right: on Heroku, you can set things up so that an uberjar is created on git push and then started with java -jar on startup, which is usually much faster. See for example: https://github.com/plexus/chestnut/blob/master/src/leiningen/new/chestnut/Procfile I *think* it was enough to declare an :uberjar-name entry in the prpject.clj to trigger that behaviour on Heroku, but I am not quite sure. You'll have to experiment a bit (or hope someone else can answer more definitely). On Monday, 27 July 2015, Gary Verhaegen gary.verhae...@gmail.com wrote: the error message also sugget that your process may not have started quickly enough. How do you deploy on heroku? Do you have a Procfile? What does it say? Do you prepackage on push, or recompile everything on startup? On Monday, 27 July 2015, Divyansh Prakash divyanshprakas...@gmail.com javascript:_e(%7B%7D,'cvml','divyanshprakas...@gmail.com'); wrote: Hi! I had written a poetry generator http://yushing.herokuapp.com/ sometime back and wanted to convert it into a Twitter bot. I followed this tutorial https://howistart.org/posts/clojure/1 to do so. You can find my code here https://github.com/divs1210/yushing-bot. The bot's working fine from my local machine, but sporadically crashes on Heroku with the following message: 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Error R10 (Boot timeout) - Web process failed to bind to $PORT within 60 seconds of launch 2015-07-27T10:23:06.574908+00:00 heroku[web.1]: Stopping process with SIGKILL 2015-07-27T10:23:07.550373+00:00 heroku[web.1]: Process exited with status 137 2015-07-27T10:23:07.561392+00:00 heroku[web.1]: State changed from starting to crashed Some answers on SO suggest that this is because Heroku already provides a port to bind to and I might be trying to bind to some other port, but this is not the case. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: What is the best way to pass log configs everywhere without a global var?
Have you guys looked at dire? https://github.com/MichaelDrogalis/dire/blob/master/README.md it could be used to take decomplection one step further, by not defining monitoring things inline at all. A library author could define additional logging namespace(s) with fns that load different levels of logging. On Monday, 27 July 2015, Colin Yates colin.ya...@gmail.com wrote: I don’t have a proof of concept either but if somebody is going to put some effort into writing a new library I had a great idea they could incorporate. Continuing the ‘decomplecting’ that James started, the other thing that is decomplected (or actually not addressed at all) is _why_ we want logging to be produced. For me, I often want to see WARNING and above all the time and only see INFO and below if something interesting happened. ‘Interesting’ typically being an exception happened. My notion was to add an adapter which at some point (e.g. around the use-case service/transaction boundary) started collecting all the logs in-memory and if the service executed correctly would simply drop the INFO and below messages. However, if the service aborted (e.g. threw an Exception) only then would the INFO and below logs get written to disk. It’s so simple and useful I can’t believe nobody else has already written it. My excuse is good old time. Clojure, Agents, robert-hooke - couldn’t be easer. On 27 Jul 2015, at 08:28, crocket crockabisc...@gmail.com javascript:_e(%7B%7D,'cvml','crockabisc...@gmail.com'); wrote: Can I see your proof of concept on github? Is it just an idea? On Mon, Jul 27, 2015 at 2:27 PM, James Reeves ja...@booleanknot.com javascript:_e(%7B%7D,'cvml','ja...@booleanknot.com'); wrote: On 27 July 2015 at 05:25, crocket crockabisc...@gmail.com javascript:_e(%7B%7D,'cvml','crockabisc...@gmail.com'); wrote: How those logs are outputted is stored in a global state called log configuration. So, I think the separation was done. How else do you want to separate that? Traditionally, logging code is written something like: (log/info HTTP request to (:request-method req) (:uri req)) So the priority of the log (info) and the formatting of the log line is inlined into the source code. A less complected piece of code would separate out what we want to monitor (req) from how we monitor it. So inline we just write: (monitor/monitor req :ring/request) This monitors the variable req and associates it with the namespaced keyword :ring/request. In our logging namespace, we can then later define how we want to report on that monitor: (monitor/add-reporter :ring/request (fn [req] (log/info HTTP request to (:request-method req) (:uri req This separates *what* we want to monitor from *how* we eventually log it. It means we can do things like define a set of useful monitoring points in a library, and then in a separate application decide on what's important. - James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure@googlegroups.com'); Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com'); For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/9YiGAp6axcY/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com');. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure@googlegroups.com'); Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com'); For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com javascript:_e(%7B%7D,'cvml','clojure%2bunsubscr...@googlegroups.com');. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send
Re: WebService request are not getting served properly
Hi Gary,
You are right, the points that you mentioned are valid. Those things are
already taken care of. I am new to Ring and Compojure so was trying out
some stuff.
I was confused at some part, but now it got cleared and code if running as
required.
Thanks for your time and reply.
On Monday, July 27, 2015 at 5:50:10 PM UTC+5:30, Gary Verhaegen wrote:
On Monday, 27 July 2015, hemant gautam gomz...@gmail.com javascript:
wrote:
On running the below mentioned code on browser I am getting Page not
found for each type of request.
Can anybody suggest me where I am doing a mistake.
(ns currentday.core
(:require [compojure.core :refer :all]
[compojure.route :as route]
[compojure.handler :as handler]
[ring.middleware.defaults :refer :all]
[ring.util.response :refer :all])
(:use ring.adapter.jetty))
(defn now []
(new java.util.Date))
(defn say-hello []
Hello!! everyone. I am home page of webservice.)
(defn date-is [req]
Today's date is: (str (now)))
(defn get-date [req]
(- (response (date-is))
(content-type text/html)))
(defn add-data [a b]
(- (response Sum of two no. is: (str (+ a b)))
(content-type text/html)))
(defn sub-data [a b]
(- (response Subtraction of two no. is: (str (- a b)))
(content-type text/html)))
(defroutes my-routes
(GET / [] Hello)
(GET /date req (get-date [req]))
(GET /add/:a/:b [a b] (add-data a b))
(GET /sub/:a/:b [a b] (sub-data a b))
(route/not-found Page not found))
(def app
(handler/site my-routes))
(defonce server (run-jetty #'app {:port 3032 :join? false}))
I'm not in a position to actually try that code, so I'm shooting blind.
Here are a few comments:
* You do not seem to be using the ring.middleware.defaults, but instead
use the deprecated compojure.handler ns.
* Your say-hello function is not used.
* Your / route returns a String, which as far as I know is not a valid
ring response. Try with {:status 200 :body Hello!} instead of just a
string?
* Your add and subtract handlers look like they should throw exceptions,
as you're calling response with 2 args and it's defined to receive a single
string argument.
* From what I see here, I do not see any reason why the /date route does
not work.
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Re: WebService request are not getting served properly
Hi Hermant, are you running this at a REPL? What URL exactly are you going to
(http://localhost:3032/ http://localhost:3032/ should work if the server is
running)?
On 27 Jul 2015, at 10:55, hemant gautam gomze...@gmail.com wrote:
On running the below mentioned code on browser I am getting Page not found
for each type of request.
Can anybody suggest me where I am doing a mistake.
(ns currentday.core
(:require [compojure.core :refer :all]
[compojure.route :as route]
[compojure.handler :as handler]
[ring.middleware.defaults :refer :all]
[ring.util.response :refer :all])
(:use ring.adapter.jetty))
(defn now []
(new java.util.Date))
(defn say-hello []
Hello!! everyone. I am home page of webservice.)
(defn date-is [req]
Today's date is: (str (now)))
(defn get-date [req]
(- (response (date-is))
(content-type text/html)))
(defn add-data [a b]
(- (response Sum of two no. is: (str (+ a b)))
(content-type text/html)))
(defn sub-data [a b]
(- (response Subtraction of two no. is: (str (- a b)))
(content-type text/html)))
(defroutes my-routes
(GET / [] Hello)
(GET /date req (get-date [req]))
(GET /add/:a/:b [a b] (add-data a b))
(GET /sub/:a/:b [a b] (sub-data a b))
(route/not-found Page not found))
(def app
(handler/site my-routes))
(defonce server (run-jetty #'app {:port 3032 :join? false}))
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Re: Twitter bot crashing on Heroku
Thanks for the response, everyone. My Procfile says: worker: lein trampoline run I'm not binding to any port because my app doesn't require it. How do I do so, though? Will it be available as a part of lein-environ? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: WebService request are not getting served properly
On Monday, 27 July 2015, hemant gautam gomze...@gmail.com wrote:
On running the below mentioned code on browser I am getting Page not
found for each type of request.
Can anybody suggest me where I am doing a mistake.
(ns currentday.core
(:require [compojure.core :refer :all]
[compojure.route :as route]
[compojure.handler :as handler]
[ring.middleware.defaults :refer :all]
[ring.util.response :refer :all])
(:use ring.adapter.jetty))
(defn now []
(new java.util.Date))
(defn say-hello []
Hello!! everyone. I am home page of webservice.)
(defn date-is [req]
Today's date is: (str (now)))
(defn get-date [req]
(- (response (date-is))
(content-type text/html)))
(defn add-data [a b]
(- (response Sum of two no. is: (str (+ a b)))
(content-type text/html)))
(defn sub-data [a b]
(- (response Subtraction of two no. is: (str (- a b)))
(content-type text/html)))
(defroutes my-routes
(GET / [] Hello)
(GET /date req (get-date [req]))
(GET /add/:a/:b [a b] (add-data a b))
(GET /sub/:a/:b [a b] (sub-data a b))
(route/not-found Page not found))
(def app
(handler/site my-routes))
(defonce server (run-jetty #'app {:port 3032 :join? false}))
I'm not in a position to actually try that code, so I'm shooting blind.
Here are a few comments:
* You do not seem to be using the ring.middleware.defaults, but instead use
the deprecated compojure.handler ns.
* Your say-hello function is not used.
* Your / route returns a String, which as far as I know is not a valid
ring response. Try with {:status 200 :body Hello!} instead of just a
string?
* Your add and subtract handlers look like they should throw exceptions, as
you're calling response with 2 args and it's defined to receive a single
string argument.
* From what I see here, I do not see any reason why the /date route does
not work.
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[clojure-rabbitmq] ANN Langohr 3.3.0 is released
Langohr [1] is a small, feature complete Clojure client for RabbitMQ. Release notes: http://blog.clojurewerkz.org/blog/2015/07/27/langohr-3-dot-3-0-is-released/ 1. http://clojurerabbitmq.info -- MK Staff Software Engineer, Pivotal/RabbitMQ -- You received this message because you are subscribed to the Google Groups clojure-rabbitmq group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure-rabbitmq+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Generating varying sized map using test.check
On 27 July 2015 at 18:10, Carlo Zancanaro carlozancan...@gmail.com wrote: You're generating two random things: the map, and the subset of the keys. You can't generate the subset of the keys without first knowing the full set of keys, so bind lets you make the subset generator depend on the result of the map generator. Thanks. That makes sense. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Generating varying sized map using test.check
Whoops, forgot the group on this. On 27 July 2015 at 18:10, Carlo Zancanaro carlozancan...@gmail.com wrote: You're generating two random things: the map, and the subset of the keys. You can't generate the subset of the keys without first knowing the full set of keys, so bind lets you make the subset generator depend on the result of the map generator. I should also point out that shrinking isn't the only problem with your original function. Normally in test.check you can repeat a test case by providing a seed to the generator. With your original code it would be more difficult to repeat a test case. On 27/07/2015 5:14 pm, Mayank Jain firesof...@gmail.com wrote: It also might be helpful to know that there is already a subset generator available in this library https://github.com/gfredericks/test.chuck#generators. Thanks, this looks good, will check it out. What you've done here might appear to work, but it will get you into trouble when test.check starts to shrink your inputs. When test.check runs your generators it relies you you using it as your only source of randomness, and so your use of `rand-int` will cause some problems. Ah yes, I didn't think of shrinking. Thanks a lot for your help! :) The trick is to use the `bind` function to make a generator which depends on the value of another generator (in this case, to capture the generated map so you can call rand-subset with the correct set of keys): I didn't get why I had to use a bind here. What if I had only used fmap? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
New Functional Programming Job Opportunities
Here are some functional programming job opportunities that were posted recently: Software Developer | Scala, Clojure | Spark, Solr, Agile at Elmar Reizen http://functionaljobs.com/jobs/8848-software-developer--scala-clojure--spark-solr-agile-at-elmar-reizen Cheers, Sean Murphy FunctionalJobs.com -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[bug] Reflector can't resolve a method in a non-public generic-typed abstact class
Reproducible minimal example
here: https://github.com/alexander-yakushev/generics-reflection-bug . Clone
it and do `lein run`.
The example is small enough to paste it here. So we have a class called
AbstractStorage:
abstract class AbstractStorageT {
T thingToStore;
public AbstractStorage(T thingToStore) {
this.thingToStore = thingToStore;
}
public T get() {
return thingToStore;
}
}
It is a non-public abstract generic-typed class. It's only use is to store
some object of the type T, and give out that object when get() is called.
Simple enough.
Then we have a concrete implementation of that class, StringStorage:
public class StringStorage extends AbstractStorageString {
public StringStorage(String thingToStore) {
super(thingToStore);
}
}
It is even simpler. It just extends the abstract class and says that the
type of object it will hold is a String. The constructor just passes the
call up to AbstractStorage.
Now comes the trouble. When you try to do the following from Clojure:
(.get (StringStorage. hello))
It fails with:
Exception in thread main java.lang.IllegalArgumentException: Can't call
public method of non-public class: public java.lang.Object
bug.AbstractStorage.get(),
compiling:(/tmp/form-init579170128820879977.clj:1:72)
at clojure.lang.Compiler.load(Compiler.java:7239)
at clojure.lang.Compiler.loadFile(Compiler.java:7165)
at clojure.main$load_script.invoke(main.clj:275)
at clojure.main$init_opt.invoke(main.clj:280)
at clojure.main$initialize.invoke(main.clj:308)
at clojure.main$null_opt.invoke(main.clj:343)
at clojure.main$main.doInvoke(main.clj:421)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at clojure.lang.Var.invoke(Var.java:383)
at clojure.lang.AFn.applyToHelper(AFn.java:156)
at clojure.lang.Var.applyTo(Var.java:700)
at clojure.main.main(main.java:37)
Caused by: java.lang.IllegalArgumentException: Can't call public method of
non-public class: public java.lang.Object bug.AbstractStorage.get()
at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:88)
at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:28)
at bug.core$_main.doInvoke(core.clj:9)
at clojure.lang.RestFn.invoke(RestFn.java:397)
at clojure.lang.Var.invoke(Var.java:375)
at user$eval2912.invoke(form-init579170128820879977.clj:1)
at clojure.lang.Compiler.eval(Compiler.java:6782)
at clojure.lang.Compiler.eval(Compiler.java:6772)
at clojure.lang.Compiler.load(Compiler.java:7227)
... 11 more
I tried to type-hint the call, but neither of the following work:
(.get ^AbstractStorage (StringStorage. hello))
(.get ^StringStorage (StringStorage. hello))
I suppose hinting to AbstractStorage should have helped, but because the
actual class has a generic type, the classes mismatch and Reflector is
still invoked. Any ideas what to do with this?
P.S.: As I was finishing writing this. I found the reported bug on JIRA:
CLJ-1243 http://dev.clojure.org/jira/browse/CLJ-1243. Still, I suppose it
will be useful to have a minimal reproducible example for this bug, and to
remind it exists.
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Re: a question about Chris Zheng's Abstract Container Pattern
I guess I'm wondering why take Zheng's approach, versus something more direct? I'm especially reacting to this: One way to look at design using abstract classes (or any language feature for that matter) is that it is a programming contract that is strictly enforced by the language itself. When we inherit functionality from an abstract class, we make a binding contract with the compiler. …Essentially, it mimics the structure of how abstract classes are defined and used in object orientated design through simple use of protocols and multimethods. But why mimic such a contract? Why not just clearly write a contract, using a library that is meant to write contracts? I mean, why not use something like Typed Clojure? On Monday, July 27, 2015 at 1:37:41 PM UTC-4, Lawrence Krubner wrote: I have a question about this: Servers that are running on a particular port can be tracked and stopped. I have to say, this was the feature that I wanted the most, which motivated the framework's design. The annoying thing about development in emacs is that I have to be careful of not losing the reference to the server. Since there was no way of stopping it unless the repl is restarted. I wanted to implement a registery for references to running servers to be saved. http://z.caudate.me/the-abstract-container-pattern/ I have the impression that he's going over the same territory as that covered by Stuart Sierra, though Zheng doesn't mention Component nor Sierra. But he offers this as an example of what he's after: (defprotocol IRunnable (start! [system]) (stop! [system]) (restart! [system]) (started? [system]) (stopped? [system])) That much seems similar to Sierra's system. Zheng seems to add an additional layer by simulating an abstract class above his protocols. As he says: - A single deftype acts as the *abstract container*, extending one or more protocols - A set of methods defined through defmulti that is used within the deftype form act as *abstract methods* - The *abstract methods* all dispatch on map keys (usually :type). I am curious if others have found this useful? Most of the people who work with Clojure have backgrounds with Object Oriented Programming, so that paradigm sometimes seems natural, or at least familiar. I often think these designs are more verbose than they need to be, but I am curious how others feel. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
a question about Chris Zheng's Abstract Container Pattern
I have a question about this: Servers that are running on a particular port can be tracked and stopped. I have to say, this was the feature that I wanted the most, which motivated the framework's design. The annoying thing about development in emacs is that I have to be careful of not losing the reference to the server. Since there was no way of stopping it unless the repl is restarted. I wanted to implement a registery for references to running servers to be saved. http://z.caudate.me/the-abstract-container-pattern/ I have the impression that he's going over the same territory as that covered by Stuart Sierra, though Zheng doesn't mention Component nor Sierra. But he offers this as an example of what he's after: (defprotocol IRunnable (start! [system]) (stop! [system]) (restart! [system] ) (started? [system]) (stopped? [system])) That much seems similar to Sierra's system. Zheng seems to add an additional layer by simulating an abstract class above his protocols. As he says: - A single deftype acts as the *abstract container*, extending one or more protocols - A set of methods defined through defmulti that is used within the deftype form act as *abstract methods* - The *abstract methods* all dispatch on map keys (usually :type). I am curious if others have found this useful? Most of the people who work with Clojure have backgrounds with Object Oriented Programming, so that paradigm sometimes seems natural, or at least familiar. I often think these designs are more verbose than they need to be, but I am curious how others feel. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: What is the best way to pass log configs everywhere without a global var?
On 27 July 2015 at 08:28, crocket crockabisc...@gmail.com wrote:
Can I see your proof of concept on github? Is it just an idea?
Well, my first attempt at this was Inquest:
https://github.com/weavejester/inquest
The idea of Inquest was to (ab)use alter-var-root to insert monitoring into
existing functions, but I quickly discovered that there were quite a few
anonymous functions I would like to monitor, as well as specific variables
inside functions. I played around with ways of wrapping functions to inject
monitoring of arguments and return values, but in the end it felt too
clumsy and complicated.
So instead, I've been considering a macro like:
(monitor key body)
For example, if you wrote:
(let [x 10] (monitor :user/example (inc x)))
This would produce messages that look like this:
{:tag :user/example
:timestamp 468822291902146
:thread-id 1502
:namespace user
:event :enter
:form (inc x)
:locals {x 10}}
{:tag :user/example
:timestamp 468822291902261
:thread-id 1502
:namespace user
:event :exit
:form (inc x)
:locals {x 10}
:return 11
:duration 115}
These messages would be passed to any listeners interested in the tag
:user/example. If there were no appropriate listeners, the macro would
execute the code without any additional wrapping. I've also been
considering having the listeners declare ahead of time what keys they're
interested in, as some keys might be expensive to generate (e.g. a
:stacktrace key).
The upshot is that you'd get a whole bunch of information that you could
then narrow down to produce any output you happen to want. If you're not
interested in listening to a particular monitor, then there's minimal
performance impact (perhaps around 50ns).
- James
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Re: Twitter bot crashing on Heroku
By default, Heroku sets up a web worker for your project. Check your project resources. It sounds like you have an extra web worker setup trying to bind to the port. - Carin On Monday, July 27, 2015 at 10:04:16 AM UTC-4, Divyansh Prakash wrote: Thanks for the response, everyone. My Procfile says: worker: lein trampoline run I'm not binding to any port because my app doesn't require it. How do I do so, though? Will it be available as a part of lein-environ? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: a question about Chris Zheng's Abstract Container Pattern
I think his last sentence gives you the answer: A warm shoutout to Tushar, Lyndon, Dean, Alan, Hank, Derek, and all the guys at clj-melb that gave feedback and helped flesh out this rehash of OO design.” (my emphasis) He wanted an OO approach and has implemented one; specifically behaviour and state coupled together. I think neither Typed Clojure nor Contracts would have achieved this guy’s goal as they are about enforcing a contract (either the shape of data or effects of a fn) in the ‘functional’ paradigm; this guy clearly wanted something in the OO paradigm. Is there a ‘functional’ implementation which gives the same benefits; sure, but that isn’t what he wanted. Are there a bunch of ‘upgrades’ that I am sure we could all apply; sure, but again it seems like he was setting out with a very specific goal in mind and has achieved that. On 27 Jul 2015, at 18:37, Lawrence Krubner lawre...@rollioforce.com wrote: I have a question about this: Servers that are running on a particular port can be tracked and stopped. I have to say, this was the feature that I wanted the most, which motivated the framework's design. The annoying thing about development in emacs is that I have to be careful of not losing the reference to the server. Since there was no way of stopping it unless the repl is restarted. I wanted to implement a registery for references to running servers to be saved. http://z.caudate.me/the-abstract-container-pattern/ I have the impression that he's going over the same territory as that covered by Stuart Sierra, though Zheng doesn't mention Component nor Sierra. But he offers this as an example of what he's after: (defprotocol IRunnable (start! [system]) (stop! [system]) (restart! [system]) (started? [system]) (stopped? [system])) That much seems similar to Sierra's system. Zheng seems to add an additional layer by simulating an abstract class above his protocols. As he says: A single deftype acts as the abstract container, extending one or more protocols A set of methods defined through defmulti that is used within the deftype form act as abstract methods The abstract methods all dispatch on map keys (usually :type). I am curious if others have found this useful? Most of the people who work with Clojure have backgrounds with Object Oriented Programming, so that paradigm sometimes seems natural, or at least familiar. I often think these designs are more verbose than they need to be, but I am curious how others feel. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [ANN] Clojure 1.8.0-alpha2
Off topic, but I wonder if there was ever any discussion of megarefs being
added to Clojure?
https://github.com/cgrand/megaref
On Tuesday, July 21, 2015 at 3:30:46 PM UTC-4, Rangel Spasov wrote:
Ok, I think someone already mentioned this - sorry. Got it to compile by
bumping to [potemkin 0.4.1] - thanks Zach + all : )
On Tuesday, July 21, 2015 at 12:24:43 PM UTC-7, Rangel Spasov wrote:
Hey guys,
Getting this error with 1.8.0-alpha2, I think related to aleph (using
0.4.0, latest version at the moment).
#error {
:cause IllegalName:
compile__stub.aleph.http.core.aleph.http.core/HeaderMap
:via
[{:type clojure.lang.Compiler$CompilerException
:message java.lang.NoClassDefFoundError: IllegalName:
compile__stub.aleph.http.core.aleph.http.core/HeaderMap,
compiling:(aleph/http/core.clj:81:1)
:at [clojure.lang.Compiler analyzeSeq Compiler.java 6798]}
{:type java.lang.NoClassDefFoundError
:message IllegalName:
compile__stub.aleph.http.core.aleph.http.core/HeaderMap
:at [java.lang.ClassLoader preDefineClass ClassLoader.java 654]}]
:trace
[[java.lang.ClassLoader preDefineClass ClassLoader.java 654]
[java.lang.ClassLoader defineClass ClassLoader.java 758]
[java.lang.ClassLoader defineClass ClassLoader.java 642]
[clojure.lang.DynamicClassLoader defineClass DynamicClassLoader.java 46]
[clojure.lang.Compiler$NewInstanceExpr compileStub Compiler.java 7815]
[clojure.lang.Compiler$NewInstanceExpr build Compiler.java 7680]
[clojure.lang.Compiler$NewInstanceExpr$DeftypeParser parse
Compiler.java 7590]
[clojure.lang.Compiler analyzeSeq Compiler.java 6791]
[clojure.lang.Compiler analyze Compiler.java 6592]
[clojure.lang.Compiler analyze Compiler.java 6553]
[clojure.lang.Compiler$BodyExpr$Parser parse Compiler.java 5929]
[clojure.lang.Compiler$LetExpr$Parser parse Compiler.java 6247]
[clojure.lang.Compiler analyzeSeq Compiler.java 6791]
[clojure.lang.Compiler analyze Compiler.java 6592]
[clojure.lang.Compiler analyze Compiler.java 6553]
[clojure.lang.Compiler$BodyExpr$Parser parse Compiler.java 5929]
[clojure.lang.Compiler$FnMethod parse Compiler.java 5359]
[clojure.lang.Compiler$FnExpr parse Compiler.java 3959]
[clojure.lang.Compiler analyzeSeq Compiler.java 6789]
[clojure.lang.Compiler analyze Compiler.java 6592]
[clojure.lang.Compiler eval Compiler.java 6847]
[clojure.lang.Compiler eval Compiler.java 6839]
[clojure.lang.Compiler load Compiler.java 7295]
[clojure.lang.RT loadResourceScript RT.java 372]
[clojure.lang.RT loadResourceScript RT.java 363]
[clojure.lang.RT load RT.java 453]
[clojure.lang.RT load RT.java 419]
[clojure.core$load$fn__5448 invoke core.clj 5866]
[clojure.core$load doInvoke core.clj 5865]
[clojure.lang.RestFn invoke RestFn.java 408]
[clojure.core$load_one invoke core.clj 5671]
[clojure.core$load_lib$fn__5397 invoke core.clj 5711]
[clojure.core$load_lib doInvoke core.clj 5710]
[clojure.lang.RestFn applyTo RestFn.java 142]
[clojure.core$apply invoke core.clj 632]
[clojure.core$load_libs doInvoke core.clj 5749]
[clojure.lang.RestFn applyTo RestFn.java 137]
[clojure.core$apply invoke core.clj 632]
[clojure.core$require doInvoke core.clj 5832]
[clojure.lang.RestFn invoke RestFn.java 551]
[aleph.http.server$eval9251$loading__5340__auto9252 invoke
server.clj 1]
[aleph.http.server$eval9251 invoke server.clj 1]
[clojure.lang.Compiler eval Compiler.java 6850]
[clojure.lang.Compiler eval Compiler.java 6839]
[clojure.lang.Compiler load Compiler.java 7295]
[clojure.lang.RT loadResourceScript RT.java 372]
[clojure.lang.RT loadResourceScript RT.java 363]
[clojure.lang.RT load RT.java 453]
[clojure.lang.RT load RT.java 419]
[clojure.core$load$fn__5448 invoke core.clj 5866]
[clojure.core$load doInvoke core.clj 5865]
[clojure.lang.RestFn invoke RestFn.java 408]
[clojure.core$load_one invoke core.clj 5671]
[clojure.core$load_lib$fn__5397 invoke core.clj 5711]
[clojure.core$load_lib doInvoke core.clj 5710]
[clojure.lang.RestFn applyTo RestFn.java 142]
[clojure.core$apply invoke core.clj 632]
[clojure.core$load_libs doInvoke core.clj 5753]
[clojure.lang.RestFn applyTo RestFn.java 137]
[clojure.core$apply invoke core.clj 632]
[clojure.core$require doInvoke core.clj 5832]
[clojure.lang.RestFn invoke RestFn.java 457]
[aleph.http$eval1594$loading__5340__auto1595 invoke http.clj 1]
[aleph.http$eval1594 invoke http.clj 1]
[clojure.lang.Compiler eval Compiler.java 6850]
[clojure.lang.Compiler eval Compiler.java 6839]
[clojure.lang.Compiler load Compiler.java 7295]
[clojure.lang.RT loadResourceScript RT.java 372]
[clojure.lang.RT loadResourceScript RT.java 363]
[clojure.lang.RT load RT.java 453]
[clojure.lang.RT load RT.java 419]
[clojure.core$load$fn__5448 invoke core.clj 5866]
[ANN] clojure.java.jdbc 0.4.1
Clojure contrib library that provides JDBC wrapper. https://github.com/clojure/java.jdbc • Release 0.4.0 / 0.4.1 on 2015-07-26 • db-do-prepared now allows transaction? to be omitted when a PreparedStatement is passed as the second argument JDBC-111 - Stefan Kamphausen. • Nested transaction checks isolation level is the same JDBC-110 - Donald Ball (new contributor!). • Default PostgreSQL port; Support more dbtype/dbname variants JDBC-109. • Drop Clojure 1.2 compatibility. The jump from 0.3.7 to 0.4.x is because I'm dropping Clojure 1.2 compatibility. (if anyone wonders why 0.4.0 and 0.4.1 are the same release, it was finger trouble while trying to run the Maven Release Build on the Clojure build server… sorry!) Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
ANN Langohr 3.3.0 is released
Langohr [1] is a small, feature complete Clojure client for RabbitMQ. Release notes: http://blog.clojurewerkz.org/blog/2015/07/27/langohr-3-dot-3-0-is-released/ 1. http://clojurerabbitmq.info -- MK -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Java 8 Lambda Interop
Thanks for the reply Gary. Sounds like I'm on as good a track as I can be with current Clojure. I am curious though why you say that it is unrealistic for IFn to support arbitrary @FunctionalInterface. It certainly seems like it would require compiler changes, but I would think that either through emitting bytecode closer to Java 8 lambdas or through some form of type coercion it would possible. For example, Groovy just coerces their Closures to any Single Abstract Method type. I'm not sure how java.util.function.* as protocols would work, but still would require implementing for each SAM you come across. IFn as a protocol seems to address a different interop use case. Maybe for receiving a Java lambda you want to use as if it's a Clojure function. Most of the Java interop from Clojure is slick (sometimes more clear than in Java itself), it would be unfortunate to leave functions as second-class citizens for interop. Granted, there may be a simplicity argument against this (maybe that's why Java varargs require an explicit array?). Andrew Oberstar On Mon, Jul 27, 2015 at 4:16 AM Gary Verhaegen gary.verhae...@gmail.com wrote: On Sunday, 26 July 2015, Andrew Oberstar ajobers...@gmail.com wrote: Hi, I'm wondering if anyone has a good approach for making calls from Clojure to Java APIs (e.g. Stream API) that expect a @FunctionalInterface type. Ideally, IFn would transparently work, but I'm guessing that requires some compiler changes. Right now, the best I can think of is a function or macro to reify a wrapper around a Clojure function to implement all of the usual interfaces from java.util.function. Anyone have any better ideas? Andrew Oberstar You're probably aware of this, but @FunctionalInterface is not a type, it's an annotation. All it does is ensure, at compile time, that the annotated element is an interface with a single non-default and non-static method. At the type-system level, it's just an interface like any other, and the lambda syntax is just a shorthand for an anonymous instance of a well-defined type. Since the lambda syntax is java-compiler magic, you can't access it from Clojure, and the most straightforward option right now is to actually know which type is expected, e.g.: user= (- (doto (java.util.ArrayList.) (.add 1) (.add 2)) (.stream) (.map (reify java.util.function.Function (apply [_ arg] (inc arg (.collect (java.util.stream.Collectors/toList))) [2 3] user= As neither IFn nor Function are Clojure protocols, I do indeed think you're best bet is a macro to essentially generate the above reify. You can of course do a single macro that reifies to all of the protocols that you need. I don't think it's realistic to hope that IFn will cover any arbitrary @FunctionalInterface, as that is Java compiler magic. It may, in the future, be extended to cover all of the standard ones in java.util.function, or even all the ones in the standard library, but it's not going to happen until Java 7 support is dropped. I guess the best you could hope for in the short term would be to have IFn changed to a protocol. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Java 8 Lambda Interop
It could certainly be achieved in the Clojure compiler, by allowing (some-functional-interface .) to compile to the appropriate function call even if it doesn't implement IFn It would be quite a big change though and would probably have some limitations, e.g.: a) It probably wouldn't work with regular vars since it wouldn't be able to handle re-binding b) You would probably have to type hint the some-functional-interface object in some way so that the compiler knows to do this at compile time A less invasive option would be to just have some code to wrap functional interfaces in an appropriate IFn. Worth a JIRA ticket for consideration at least? On Tuesday, 28 July 2015 08:52:47 UTC+8, Andrew Oberstar wrote: Thanks for the reply Gary. Sounds like I'm on as good a track as I can be with current Clojure. I am curious though why you say that it is unrealistic for IFn to support arbitrary @FunctionalInterface. It certainly seems like it would require compiler changes, but I would think that either through emitting bytecode closer to Java 8 lambdas or through some form of type coercion it would possible. For example, Groovy just coerces their Closures to any Single Abstract Method type. I'm not sure how java.util.function.* as protocols would work, but still would require implementing for each SAM you come across. IFn as a protocol seems to address a different interop use case. Maybe for receiving a Java lambda you want to use as if it's a Clojure function. Most of the Java interop from Clojure is slick (sometimes more clear than in Java itself), it would be unfortunate to leave functions as second-class citizens for interop. Granted, there may be a simplicity argument against this (maybe that's why Java varargs require an explicit array?). Andrew Oberstar On Mon, Jul 27, 2015 at 4:16 AM Gary Verhaegen gary.ve...@gmail.com javascript: wrote: On Sunday, 26 July 2015, Andrew Oberstar ajobe...@gmail.com javascript: wrote: Hi, I'm wondering if anyone has a good approach for making calls from Clojure to Java APIs (e.g. Stream API) that expect a @FunctionalInterface type. Ideally, IFn would transparently work, but I'm guessing that requires some compiler changes. Right now, the best I can think of is a function or macro to reify a wrapper around a Clojure function to implement all of the usual interfaces from java.util.function. Anyone have any better ideas? Andrew Oberstar You're probably aware of this, but @FunctionalInterface is not a type, it's an annotation. All it does is ensure, at compile time, that the annotated element is an interface with a single non-default and non-static method. At the type-system level, it's just an interface like any other, and the lambda syntax is just a shorthand for an anonymous instance of a well-defined type. Since the lambda syntax is java-compiler magic, you can't access it from Clojure, and the most straightforward option right now is to actually know which type is expected, e.g.: user= (- (doto (java.util.ArrayList.) (.add 1) (.add 2)) (.stream) (.map (reify java.util.function.Function (apply [_ arg] (inc arg (.collect (java.util.stream.Collectors/toList))) [2 3] user= As neither IFn nor Function are Clojure protocols, I do indeed think you're best bet is a macro to essentially generate the above reify. You can of course do a single macro that reifies to all of the protocols that you need. I don't think it's realistic to hope that IFn will cover any arbitrary @FunctionalInterface, as that is Java compiler magic. It may, in the future, be extended to cover all of the standard ones in java.util.function, or even all the ones in the standard library, but it's not going to happen until Java 7 support is dropped. I guess the best you could hope for in the short term would be to have IFn changed to a protocol. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com
Re: Java 8 Lambda Interop
Mikera, I think you're addressing a different interop concern. I'm particularly interested in something like this: (- (IntStream/range 0 100) (.filter odd?) (.limit 5) (.collect Collectors/toList)) Where odd? is a normal Clojure IFn that I want to use when calling a Java API that expects something implementing a single-method-interface (Predicate in this case). Right now I need to do something like this: (defn lambda [f] (reify Predicate (test [x] (f x (- (IntStream/range 0 100) (.filter (lambda odd?)) (.limit 5) (.collect Collectors/toList)) Andrew Oberstar On Mon, Jul 27, 2015 at 8:16 PM Mikera mike.r.anderson...@gmail.com wrote: It could certainly be achieved in the Clojure compiler, by allowing (some-functional-interface .) to compile to the appropriate function call even if it doesn't implement IFn It would be quite a big change though and would probably have some limitations, e.g.: a) It probably wouldn't work with regular vars since it wouldn't be able to handle re-binding b) You would probably have to type hint the some-functional-interface object in some way so that the compiler knows to do this at compile time A less invasive option would be to just have some code to wrap functional interfaces in an appropriate IFn. Worth a JIRA ticket for consideration at least? On Tuesday, 28 July 2015 08:52:47 UTC+8, Andrew Oberstar wrote: Thanks for the reply Gary. Sounds like I'm on as good a track as I can be with current Clojure. I am curious though why you say that it is unrealistic for IFn to support arbitrary @FunctionalInterface. It certainly seems like it would require compiler changes, but I would think that either through emitting bytecode closer to Java 8 lambdas or through some form of type coercion it would possible. For example, Groovy just coerces their Closures to any Single Abstract Method type. I'm not sure how java.util.function.* as protocols would work, but still would require implementing for each SAM you come across. IFn as a protocol seems to address a different interop use case. Maybe for receiving a Java lambda you want to use as if it's a Clojure function. Most of the Java interop from Clojure is slick (sometimes more clear than in Java itself), it would be unfortunate to leave functions as second-class citizens for interop. Granted, there may be a simplicity argument against this (maybe that's why Java varargs require an explicit array?). Andrew Oberstar On Mon, Jul 27, 2015 at 4:16 AM Gary Verhaegen gary.ve...@gmail.com wrote: On Sunday, 26 July 2015, Andrew Oberstar ajobe...@gmail.com wrote: Hi, I'm wondering if anyone has a good approach for making calls from Clojure to Java APIs (e.g. Stream API) that expect a @FunctionalInterface type. Ideally, IFn would transparently work, but I'm guessing that requires some compiler changes. Right now, the best I can think of is a function or macro to reify a wrapper around a Clojure function to implement all of the usual interfaces from java.util.function. Anyone have any better ideas? Andrew Oberstar You're probably aware of this, but @FunctionalInterface is not a type, it's an annotation. All it does is ensure, at compile time, that the annotated element is an interface with a single non-default and non-static method. At the type-system level, it's just an interface like any other, and the lambda syntax is just a shorthand for an anonymous instance of a well-defined type. Since the lambda syntax is java-compiler magic, you can't access it from Clojure, and the most straightforward option right now is to actually know which type is expected, e.g.: user= (- (doto (java.util.ArrayList.) (.add 1) (.add 2)) (.stream) (.map (reify java.util.function.Function (apply [_ arg] (inc arg (.collect (java.util.stream.Collectors/toList))) [2 3] user= As neither IFn nor Function are Clojure protocols, I do indeed think you're best bet is a macro to essentially generate the above reify. You can of course do a single macro that reifies to all of the protocols that you need. I don't think it's realistic to hope that IFn will cover any arbitrary @FunctionalInterface, as that is Java compiler magic. It may, in the future, be extended to cover all of the standard ones in java.util.function, or even all the ones in the standard library, but it's not going to happen until Java 7 support is dropped. I guess the best you could hope for in the short term would be to have IFn changed to a protocol. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you
Re: ANN: ClojureScript 0.0-3308, fixes enhancements
After running lein new mies test and then scripts/watch I am getting the following exception: π ./scripts/watch Building ... Reading analysis cache for jar:file:/Users/ajmorgan/.m2/repository/org/clojure/clojurescript/0.0-3308/clojurescript-0.0-3308-aot.jar!/cljs/core.cljs Compiling src/test/core.cljs Analyzing jar:file:/Users/ajmorgan/.m2/repository/org/clojure/clojurescript/0.0-3308/clojurescript-0.0-3308-aot.jar!/clojure/browser/repl.cljs Analyzing jar:file:/Users/ajmorgan/.m2/repository/org/clojure/clojurescript/0.0-3308/clojurescript-0.0-3308-aot.jar!/clojure/browser/net.cljs Analyzing jar:file:/Users/ajmorgan/.m2/repository/org/clojure/clojurescript/0.0-3308/clojurescript-0.0-3308-aot.jar!/clojure/browser/event.cljs Analyzing jar:file:/Users/ajmorgan/.m2/repository/org/clojure/clojurescript/0.0-3308/clojurescript-0.0-3308-aot.jar!/cljs/repl.cljs Compiling out/cljs/core.cljs Using cached cljs.core out/cljs/core.cljs Compiling out/clojure/browser/repl.cljs Compiling out/clojure/browser/event.cljs Compiling out/cljs/repl.cljs Compiling out/clojure/browser/net.cljs java.lang.NoSuchMethodError: cljs.js_deps.IJavaScript._closure_lib_QMARK_()Ljava/lang/Object; at cljs.closure$rel_output_path.invoke(closure.clj:1155) at cljs.closure$write_javascript.invoke(closure.clj:1177) at cljs.closure$source_on_disk.invoke(closure.clj:1205) at cljs.closure$output_unoptimized$fn__3061.invoke(closure.clj:1239) at clojure.core$map$fn__4553.invoke(core.clj:2624) at clojure.lang.LazySeq.sval(LazySeq.java:40) at clojure.lang.LazySeq.seq(LazySeq.java:49) at clojure.lang.RT.seq(RT.java:507) at clojure.core$seq__4128.invoke(core.clj:137) at clojure.core$filter$fn__4580.invoke(core.clj:2679) at clojure.lang.LazySeq.sval(LazySeq.java:40) at clojure.lang.LazySeq.seq(LazySeq.java:49) at clojure.lang.RT.seq(RT.java:507) at clojure.core$seq__4128.invoke(core.clj:137) at clojure.core$map$fn__4553.invoke(core.clj:2616) at clojure.lang.LazySeq.sval(LazySeq.java:40) at clojure.lang.LazySeq.seq(LazySeq.java:49) at clojure.lang.RT.seq(RT.java:507) at clojure.core$seq__4128.invoke(core.clj:137) at clojure.core$apply.invoke(core.clj:630) at cljs.closure$deps_file.invoke(closure.clj:1041) at cljs.closure$output_deps_file.invoke(closure.clj:1061) at cljs.closure$output_unoptimized.doInvoke(closure.clj:1247) at clojure.lang.RestFn.applyTo(RestFn.java:139) at clojure.core$apply.invoke(core.clj:632) at cljs.closure$build.invoke(closure.clj:1519) at cljs.closure$watch$buildf__3163.invoke(closure.clj:1564) at cljs.closure$watch.invoke(closure.clj:1594) at cljs.closure$watch.invoke(closure.clj:1552) at cljs.closure$watch.invoke(closure.clj:1547) at cljs.build.api$watch.invoke(api.clj:182) at user$eval2964.invoke(watch.clj:3) at clojure.lang.Compiler.eval(Compiler.java:6782) at clojure.lang.Compiler.load(Compiler.java:7227) at clojure.lang.Compiler.loadFile(Compiler.java:7165) at clojure.main$load_script.invoke(main.clj:275) at clojure.main$script_opt.invoke(main.clj:337) at clojure.main$main.doInvoke(main.clj:421) at clojure.lang.RestFn.invoke(RestFn.java:408) at clojure.lang.Var.invoke(Var.java:379) at clojure.lang.AFn.applyToHelper(AFn.java:154) at clojure.lang.Var.applyTo(Var.java:700) at clojure.main.main(main.java:37) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93) at clojure.lang.Reflector.invokeStaticMethod(Reflector.java:207) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93) at clojure.lang.Reflector.invokeStaticMethod(Reflector.java:207) at user$eval5.invoke(form-init6371333665776042787.clj:1) at clojure.lang.Compiler.eval(Compiler.java:6782) at clojure.lang.Compiler.eval(Compiler.java:6772) at clojure.lang.Compiler.load(Compiler.java:7227) at clojure.lang.Compiler.loadFile(Compiler.java:7165) at clojure.main$load_script.invoke(main.clj:275) at clojure.main$init_opt.invoke(main.clj:280) at clojure.main$initialize.invoke(main.clj:308)
Re: Java 8 Lambda Interop
Ah, I get what you are doing now. Don't think that is likely to work unless Clojure starts making IFn instances implement the right java.util.function.* interfaces. Which seems unlikely given the conservatism of Clojure development. Having said that, I do think it is possible, have been playing around with a little toy language implementation that does something similar. I think you are better off for now writing a function or macro that allows you to wrap a Clojure function as a java.util.function.Predicate and lets you do something like: (.filter (predicate odd?)) On Tuesday, 28 July 2015 09:53:25 UTC+8, Andrew Oberstar wrote: Mikera, I think you're addressing a different interop concern. I'm particularly interested in something like this: (- (IntStream/range 0 100) (.filter odd?) (.limit 5) (.collect Collectors/toList)) Where odd? is a normal Clojure IFn that I want to use when calling a Java API that expects something implementing a single-method-interface (Predicate in this case). Right now I need to do something like this: (defn lambda [f] (reify Predicate (test [x] (f x (- (IntStream/range 0 100) (.filter (lambda odd?)) (.limit 5) (.collect Collectors/toList)) Andrew Oberstar On Mon, Jul 27, 2015 at 8:16 PM Mikera mike.r.an...@gmail.com javascript: wrote: It could certainly be achieved in the Clojure compiler, by allowing (some-functional-interface .) to compile to the appropriate function call even if it doesn't implement IFn It would be quite a big change though and would probably have some limitations, e.g.: a) It probably wouldn't work with regular vars since it wouldn't be able to handle re-binding b) You would probably have to type hint the some-functional-interface object in some way so that the compiler knows to do this at compile time A less invasive option would be to just have some code to wrap functional interfaces in an appropriate IFn. Worth a JIRA ticket for consideration at least? On Tuesday, 28 July 2015 08:52:47 UTC+8, Andrew Oberstar wrote: Thanks for the reply Gary. Sounds like I'm on as good a track as I can be with current Clojure. I am curious though why you say that it is unrealistic for IFn to support arbitrary @FunctionalInterface. It certainly seems like it would require compiler changes, but I would think that either through emitting bytecode closer to Java 8 lambdas or through some form of type coercion it would possible. For example, Groovy just coerces their Closures to any Single Abstract Method type. I'm not sure how java.util.function.* as protocols would work, but still would require implementing for each SAM you come across. IFn as a protocol seems to address a different interop use case. Maybe for receiving a Java lambda you want to use as if it's a Clojure function. Most of the Java interop from Clojure is slick (sometimes more clear than in Java itself), it would be unfortunate to leave functions as second-class citizens for interop. Granted, there may be a simplicity argument against this (maybe that's why Java varargs require an explicit array?). Andrew Oberstar On Mon, Jul 27, 2015 at 4:16 AM Gary Verhaegen gary.ve...@gmail.com wrote: On Sunday, 26 July 2015, Andrew Oberstar ajobe...@gmail.com wrote: Hi, I'm wondering if anyone has a good approach for making calls from Clojure to Java APIs (e.g. Stream API) that expect a @FunctionalInterface type. Ideally, IFn would transparently work, but I'm guessing that requires some compiler changes. Right now, the best I can think of is a function or macro to reify a wrapper around a Clojure function to implement all of the usual interfaces from java.util.function. Anyone have any better ideas? Andrew Oberstar You're probably aware of this, but @FunctionalInterface is not a type, it's an annotation. All it does is ensure, at compile time, that the annotated element is an interface with a single non-default and non-static method. At the type-system level, it's just an interface like any other, and the lambda syntax is just a shorthand for an anonymous instance of a well-defined type. Since the lambda syntax is java-compiler magic, you can't access it from Clojure, and the most straightforward option right now is to actually know which type is expected, e.g.: user= (- (doto (java.util.ArrayList.) (.add 1) (.add 2)) (.stream) (.map (reify java.util.function.Function (apply [_ arg] (inc arg (.collect (java.util.stream.Collectors/toList))) [2 3] user= As neither IFn nor Function are Clojure protocols, I do indeed think you're best bet is a macro to essentially generate the above reify. You can of course do a single macro that reifies to all of the protocols that you need. I don't think it's realistic to hope that IFn will cover any arbitrary @FunctionalInterface, as that is Java compiler magic. It may, in the future, be extended to cover
Re: Java 8 Lambda Interop
I think Mike was suggesting something like this: (- (IntStream/range 0 100) (.filter ^Predicate odd?) (.limit 5) (.collect Collectors/toList)) and having the Clojure compiler figure out that you’re trying to cast an IFn to a functional interface and therefore do the magic for you. I don’t know whether this is even feasible (FWIW, I certainly don’t think it is desirable). The compiler would have to know about all the possible functional interfaces in order to reify them behind the scenes for you (since each one has a different method name, so something needs to know how to get from the Java interface type to the method name behind it). I’m not sure I get your use case — if you’re dealing with that much Java interop it seems like it might be a good idea to create a DSL (functions, maybe macros) that make the code cleaner and hide the low-level details of Java interop anyway. Besides, your example sounds like something Clojure can already do natively and much more cleanly. Can you perhaps give us more detailed motivation for what you’re trying to achieve? Perhaps there’s a cleaner way altogether…? Sean On Jul 27, 2015, at 6:53 PM, Andrew Oberstar ajobers...@gmail.com wrote: Mikera, I think you're addressing a different interop concern. I'm particularly interested in something like this: (- (IntStream/range 0 100) (.filter odd?) (.limit 5) (.collect Collectors/toList)) Where odd? is a normal Clojure IFn that I want to use when calling a Java API that expects something implementing a single-method-interface (Predicate in this case). Right now I need to do something like this: (defn lambda [f] (reify Predicate (test [x] (f x (- (IntStream/range 0 100) (.filter (lambda odd?)) (.limit 5) (.collect Collectors/toList)) Andrew Oberstar On Mon, Jul 27, 2015 at 8:16 PM Mikera mike.r.anderson...@gmail.com mailto:mike.r.anderson...@gmail.com wrote: It could certainly be achieved in the Clojure compiler, by allowing (some-functional-interface .) to compile to the appropriate function call even if it doesn't implement IFn It would be quite a big change though and would probably have some limitations, e.g.: a) It probably wouldn't work with regular vars since it wouldn't be able to handle re-binding b) You would probably have to type hint the some-functional-interface object in some way so that the compiler knows to do this at compile time A less invasive option would be to just have some code to wrap functional interfaces in an appropriate IFn. Worth a JIRA ticket for consideration at least? On Tuesday, 28 July 2015 08:52:47 UTC+8, Andrew Oberstar wrote: Thanks for the reply Gary. Sounds like I'm on as good a track as I can be with current Clojure. I am curious though why you say that it is unrealistic for IFn to support arbitrary @FunctionalInterface. It certainly seems like it would require compiler changes, but I would think that either through emitting bytecode closer to Java 8 lambdas or through some form of type coercion it would possible. For example, Groovy just coerces their Closures to any Single Abstract Method type. I'm not sure how java.util.function.* as protocols would work, but still would require implementing for each SAM you come across. IFn as a protocol seems to address a different interop use case. Maybe for receiving a Java lambda you want to use as if it's a Clojure function. Most of the Java interop from Clojure is slick (sometimes more clear than in Java itself), it would be unfortunate to leave functions as second-class citizens for interop. Granted, there may be a simplicity argument against this (maybe that's why Java varargs require an explicit array?). Andrew Oberstar On Mon, Jul 27, 2015 at 4:16 AM Gary Verhaegen gary.ve...@gmail.com wrote: On Sunday, 26 July 2015, Andrew Oberstar ajobe...@gmail.com wrote: Hi, I'm wondering if anyone has a good approach for making calls from Clojure to Java APIs (e.g. Stream API) that expect a @FunctionalInterface type. Ideally, IFn would transparently work, but I'm guessing that requires some compiler changes. Right now, the best I can think of is a function or macro to reify a wrapper around a Clojure function to implement all of the usual interfaces from java.util.function. Anyone have any better ideas? Andrew Oberstar You're probably aware of this, but @FunctionalInterface is not a type, it's an annotation. All it does is ensure, at compile time, that the annotated element is an interface with a single non-default and non-static method. At the type-system level, it's just an interface like any other, and the lambda syntax is just a shorthand for an anonymous instance of a well-defined type. Since the lambda syntax is java-compiler magic, you can't access it from Clojure, and the most straightforward option right now is to actually know which type is expected, e.g.: user= (-
Re: Generating varying sized map using test.check
It also might be helpful to know that there is already a subset generator available in this library https://github.com/gfredericks/test.chuck#generators. Thanks, this looks good, will check it out. What you've done here might appear to work, but it will get you into trouble when test.check starts to shrink your inputs. When test.check runs your generators it relies you you using it as your only source of randomness, and so your use of `rand-int` will cause some problems. Ah yes, I didn't think of shrinking. Thanks a lot for your help! :) The trick is to use the `bind` function to make a generator which depends on the value of another generator (in this case, to capture the generated map so you can call rand-subset with the correct set of keys): I didn't get why I had to use a bind here. What if I had only used fmap? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: What is the best way to pass log configs everywhere without a global var?
I don’t have a proof of concept either but if somebody is going to put some effort into writing a new library I had a great idea they could incorporate. Continuing the ‘decomplecting’ that James started, the other thing that is decomplected (or actually not addressed at all) is _why_ we want logging to be produced. For me, I often want to see WARNING and above all the time and only see INFO and below if something interesting happened. ‘Interesting’ typically being an exception happened. My notion was to add an adapter which at some point (e.g. around the use-case service/transaction boundary) started collecting all the logs in-memory and if the service executed correctly would simply drop the INFO and below messages. However, if the service aborted (e.g. threw an Exception) only then would the INFO and below logs get written to disk. It’s so simple and useful I can’t believe nobody else has already written it. My excuse is good old time. Clojure, Agents, robert-hooke - couldn’t be easer. On 27 Jul 2015, at 08:28, crocket crockabisc...@gmail.com wrote: Can I see your proof of concept on github? Is it just an idea? On Mon, Jul 27, 2015 at 2:27 PM, James Reeves ja...@booleanknot.com mailto:ja...@booleanknot.com wrote: On 27 July 2015 at 05:25, crocket crockabisc...@gmail.com wrote: How those logs are outputted is stored in a global state called log configuration. So, I think the separation was done. How else do you want to separate that? Traditionally, logging code is written something like: (log/info HTTP request to (:request-method req) (:uri req)) So the priority of the log (info) and the formatting of the log line is inlined into the source code. A less complected piece of code would separate out what we want to monitor (req) from how we monitor it. So inline we just write: (monitor/monitor req :ring/request) This monitors the variable req and associates it with the namespaced keyword :ring/request. In our logging namespace, we can then later define how we want to report on that monitor: (monitor/add-reporter :ring/request (fn [req] (log/info HTTP request to (:request-method req) (:uri req This separates *what* we want to monitor from *how* we eventually log it. It means we can do things like define a set of useful monitoring points in a library, and then in a separate application decide on what's important. - James -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/9YiGAp6axcY/unsubscribe https://groups.google.com/d/topic/clojure/9YiGAp6axcY/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com mailto:clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit
Re: Java 8 Lambda Interop
On Sunday, 26 July 2015, Andrew Oberstar ajobers...@gmail.com wrote: Hi, I'm wondering if anyone has a good approach for making calls from Clojure to Java APIs (e.g. Stream API) that expect a @FunctionalInterface type. Ideally, IFn would transparently work, but I'm guessing that requires some compiler changes. Right now, the best I can think of is a function or macro to reify a wrapper around a Clojure function to implement all of the usual interfaces from java.util.function. Anyone have any better ideas? Andrew Oberstar You're probably aware of this, but @FunctionalInterface is not a type, it's an annotation. All it does is ensure, at compile time, that the annotated element is an interface with a single non-default and non-static method. At the type-system level, it's just an interface like any other, and the lambda syntax is just a shorthand for an anonymous instance of a well-defined type. Since the lambda syntax is java-compiler magic, you can't access it from Clojure, and the most straightforward option right now is to actually know which type is expected, e.g.: user= (- (doto (java.util.ArrayList.) (.add 1) (.add 2)) (.stream) (.map (reify java.util.function.Function (apply [_ arg] (inc arg (.collect (java.util.stream.Collectors/toList))) [2 3] user= As neither IFn nor Function are Clojure protocols, I do indeed think you're best bet is a macro to essentially generate the above reify. You can of course do a single macro that reifies to all of the protocols that you need. I don't think it's realistic to hope that IFn will cover any arbitrary @FunctionalInterface, as that is Java compiler magic. It may, in the future, be extended to cover all of the standard ones in java.util.function, or even all the ones in the standard library, but it's not going to happen until Java 7 support is dropped. I guess the best you could hope for in the short term would be to have IFn changed to a protocol. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
