Re: is ok use a blocking get !! at the end of sequence of async calls
thanks for the reply Erik, that's what I feared, I'm using vertx with the
ring adapter, basically I do several http async request in my handler and
I've rewrote several libs for adapt thes e to vertx, so block my server is
really bad for me :D ...
http-kit offers an adaptation for ring which handle channel responses
and https://github.com/mpenet/jet seems do something similar, unfortunately
vertx doesnt have a big community and could take some time for get this
adaptations..
seems than I'll need keep using clojure with vertx directly and don't use
nice libs like compojure,buddy,liberator...that is sad...if you know about
some small adapter or some code which can I use please let me know...
thanks
El miércoles, 25 de marzo de 2015, 17:29:29 (UTC-4:30), Erik Price escribió:
There is no best approach for this. Yes, you do end up blocking the
request thread, but that’s what needs to happen if you the response
requires the value returned by the channel. You can’t return a response to
the browser and then change it later when the channel sends its value.
(You’d have the same problem with Rx, btw.)
The closest equivalent to Rx’s complete event is that a channel is closed
(in which case anything blocked or parked on that channel will receive nil
).
e
On Wed, Mar 25, 2015 at 12:08 AM, coco clasespart...@gmail.com
javascript: wrote:
Hi guys...I've a code similar to this:
(defn user-data []
(!/go
(let [a (!/! (fun-async 2))
b (!/! (fun-async a))]
{:response b})))
(defn handler-something []
(let [data (!/!! (user-data))] ;;block here
(print data)
(response data..)))
user-data do a sucession of async calls and return a channel (because
it's inside a go block no?)
my handler-something need extract this data and return it in a ring
response...I can wrap my response function inside a go block, if I do this
I get
java.lang.IllegalArgumentException: No implementation of method: :render
of protocol: #'compojure.response/Renderable found for class:
clojure.core.async.impl.channels.ManyToManyChannel
so basically I use a block get !! and then return the data...I'm more
familiar with FRP and in FRP I would use a onComplete method which
basically do the same as !!
this pattern is correct or I'll end blocking code?...which could be the
best approach for this?..thanks!
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is ok use a blocking get !! at the end of sequence of async calls
Hi guys...I've a code similar to this:
(defn user-data []
(!/go
(let [a (!/! (fun-async 2))
b (!/! (fun-async a))]
{:response b})))
(defn handler-something []
(let [data (!/!! (user-data))] ;;block here
(print data)
(response data..)))
user-data do a sucession of async calls and return a channel (because it's
inside a go block no?)
my handler-something need extract this data and return it in a ring
response...I can wrap my response function inside a go block, if I do this
I get
java.lang.IllegalArgumentException: No implementation of method: :render of
protocol: #'compojure.response/Renderable found for class:
clojure.core.async.impl.channels.ManyToManyChannel
so basically I use a block get !! and then return the data...I'm more
familiar with FRP and in FRP I would use a onComplete method which
basically do the same as !!
this pattern is correct or I'll end blocking code?...which could be the
best approach for this?..thanks!
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about binding and dynamic vars
Hi guys, I'm curious about how work some codes with binding and dynamics
vars, for instance, in sqlkorma you define your db settings
(defdb prod (postgres {:db korma
:user db
:password dbpass}))
and then you can use other functions like this
(select user
(with address)
(fields :firstName :lastName :address.state)
(where {:email ko...@sqlkorma.com}))
without pass your config db as parameter..
some korma functions expects your db configuration as first parameter...but if
you had defined your db before using defdb macro, then you can omit this
parameter
(defentity users
;; Basic configuration
(pk :id) ;; by default id. This line is unnecessary.
;; it's used for relationships joins.
(table :users) ;; by default the name of the symbol.
;; The line above is also unecessary.
(database db) ;; if none is specified the last defdb ---
;; will be used. Also unnecessary.
)
I've found this pattern in many clojure codes, but I can't understand how it
works..can someone provides me a simple and clear example about how write
something like this?..thank so much!
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about binding and dynamic vars
Hi guys, I'm curious about how work some codes with binding and dynamics
vars, for instance, in sqlkorma you define your db settings
(defdb prod (postgres {:db korma
:user db
:password dbpass}))
and then you can use other functions like this
(select user
(with address)
(fields :firstName :lastName :address.state)
(where {:email korma sqlkorma.com})) ko...@sqlkorma.com}))
without pass your config db as parameter..
some korma functions expects your db configuration ...but if you had
defined your db before using defdb macro, then you can omit this parameter,
other sample:
(defentity users
;; Basic configuration
(pk :id) ;; by default id. This line is unnecessary.
;; it's used for relationships joins.
(table :users) ;; by default the name of the symbol.
;; The line above is also unecessary.
(database db) ;; if none is specified the last defdb ---
;; will be used. Also unnecessary.
)
I've found this pattern in many clojure codes, but I can't understand how
it works..can someone provides me a simple and clear example about how
write something like this?..thank so much!
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Re: avian vm or robovm for desktop binary executables?..anyone has tried??
thanks for the reply skuro, yep aviam seems a bit immature yet and even the scala support fails, robovm seems more promising, there is a package for build native iOS apps with clojure https://github.com/oakes/lein-fruit , I think than would be great use clojure for scripting and command line apps but the low startup and how heavy the jvm is makes me rethink it again :D...hope someone has experience with robovm and clojure. El domingo, 15 de marzo de 2015, 2:28:42 (UTC-4:30), skuro escribió: Hi coco, I tried with Avian, and unfortunately there's quite a big part of the standard classes that Clojure needs that Avian still doesn't implement. Clojure fails to bootstrap altogether. c. Il giorno sabato 14 marzo 2015 00:59:01 UTC+1, coco ha scritto: Hi guys, I'm curiouss if its possible use avian or robovm for distribute binary desktop executables for linux,mac or windows...seems to be possible https://news.ycombinator.com/item?id=7579737 , http://labb.zafena.se/?p=673 but I've not found so much information about it :S.. I think than it would be a great big step for java , dont depend of VM which consume a lot of memory and slow app startups caused by JIT compiler...the jvm is great for web apps but obviously it's not the better choice for desktop apps and considering than clojure is great language for scripts and sys admin but the jvm is not, would be great use an alternative for command line apps too... what do you think? anyone has experience using avian or robovm?..what disadvantages has found? any problem or issue?...thanks!! -- 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.
avian vm or robovm for desktop binary executables?..anyone has tried??
Hi guys, I'm curiouss if its possible use avian or robovm for distribute binary desktop executables for linux,mac or windows...seems to be possible https://news.ycombinator.com/item?id=7579737 , http://labb.zafena.se/?p=673 but I've not found so much information about it :S.. I think than it would be a great big step for java , dont depend of VM which consume a lot of memory and slow app startups caused by JIT compiler...the jvm is great for web apps but obviously it's not the better choice for desktop apps and considering than clojure is great language for scripts and sys admin but the jvm is not, would be great use an alternative for command line apps too... what do you think? anyone has experience using avian or robovm?..what disadvantages has found? any problem or issue?...thanks!! -- 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: about macro exception : Unable to resolve classname: LinkedList, macro question and possible better approach
All your macro needs to do is to convert the first form into the second. thanks james, that make sense for me... I don't know what the rest of your function is supposed to be doing you can check my second example (def data (atom )) (defmacro blahhh [] (go (let [ch (chan)] (do (loop [] (let [res (! ch)] (if (= res secret) (do (println res) (reset! data res)) (recur) (do(doseq [word [blah bang secret goal]] (put! ch word)) It only waits a specific value in the channel and do somehting...in this case change an atom...I'm still curious about why I get that error when I declare it likes macro but it works when it's a function 3) I've this other code (defmacro defbus [bus-name args code] `(eb/on-message (str *ns* : ~bus-name) (fn ~args ~code))) basically I need convert from this (defbus some-bus [a] (eb/reply (str a))) to this (eb/on-message some-namespace:some-bus (fn [a](eb/reply (str a I did this (defmacro defbus [bus-name args code] `(eb/on-message (str *ns* : ~bus-name) (fn ~args ~code))) or (defmacro def-bus [bus-name args code] `(let [fun# (fn ~args ~code)] (eb/on-message (str *ns* ~bus-name) fun#))) the macro-expansion looks ok but when I try use it..I get some-bus is not defined..seems than it's trying evaluate the name..is it ok??..how can avoid it??... thanks again 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 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: about macro exception : Unable to resolve classname: LinkedList, macro question and possible better approach
Sure, because you haven't quoted the symbol. If you write: (str *ns* : some-bus) ups!!, yes I forget quoted the symbol, thanks james!!... In Clojure, then Clojure will look for a variable called some-bus. The error you get is because it can't find such a variable. You want to either quote the symbol, or turn it into a string, e.g. (str *ns* : (quote ~bus-name)) ; or (str *ns* : ~(str bus-name)) - James just now I'm gonna use the defbus macro, I preferred use a function instead for the other case based in your suggestion and works really well (I changed the async code for a more readable too :D)... -- 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: about macro exception : Unable to resolve classname: LinkedList, macro question and possible better approach
sorry for my crappy code, but I was changing some conditions and testing my parameters before and I end with this code (if (not (false? res)) res (recur)) I must write just (if res res (recur)) -- 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.
about macro exception : Unable to resolve classname: LinkedList, macro question and possible better approach
Hi guys, first I'm really noob using macros, basically I've this (!b (function-blah hi)) Hey..I didn't know than intellij copy/paste the text with format!..cool! Ok..returning to my question...I don't need call to function-blah...I need send a message to one address possibly named some-namespace:blah..how I discover which is the correct namespace is simple...I send a message to every possible namespace stored in a vector..when some bus return a response, I index it in a map (:function full-address) ...next calls only needs find the correct address in the map and send the message... just now I've this code: (defmacro !b [f] (if (some nil? [(resolve 'vertx-bus-routes) (resolve 'solved-vertx-routes)]) (println need use require-vertx function first) (let [function-name (first f) arguments (rest f)] (if-let [function-route (get @solved-vertx-routes function-name false)];;if the route address was indexed (send function-route arguments) ;;only send the message using this address (go (let [full-names (map #(str % : function-name) @vertx-bus-routes) ;;1)concatenate the name with the full address list response-channel (chan (count @vertx-bus-routes)) ;;2)create a channell [correct-route res] (loop [] ;;4) take only the address where you get a non false response (let [res (! response-channel)] (if (not (false? res)) res (recur] (do (doseq [name full-names] (test-bus name arguments response-channel)) ;;3) take the address list and send a message to every address (assoc @solved-vertx-routes function-name correct-route) ;;5) store the correct address in a map function-name - correct address res))) I add this to gist https://gist.github.com/anonymous/9fc79679e17e36c47994 when I try run it I get: CompilerException java.lang.IllegalArgumentException: Unable to resolve classname: LinkedList I did a simplified version of the code (also uploaded to gist line 25)..I move the correct response outside the let thinking than maybe could be the problem...but this fails (def data (atom )) (defmacro blahhh [] (go (let [ch (chan)] (do (loop [] (let [res (! ch)] (if (= res secret) (do (println res) (reset! data res)) (recur (doseq [word [blah bang secret goal]] (put! ch word)) I've three questions: 1) why the exception 2) is correct use a macro?..I'm using a macro because I need avoid try evaluate the function in the argument and instead I use it as data..but the code results a bit weird because I'm not generating code..I though than I need quote the full macro body but I read this article http://www.braveclojure.com/writing-macros/ and He did something similar (defmacro postfix-notation [expression] (conj (butlast expression) (last expression))) (macroexpand '(postfix-notation (1 1 +))); = (+ 1 1) One key difference between functions and macros is that function arguments are fully evaluated before they're passed to the function, whereas macros receive arguments as unevaluated data structures. 3) Any better way of do it?...suggestion?..the way how I use the channel is not elegant neither... thanks so much guys! 2 -- 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: call superclass constructor in clojure class generation with defrecord
Sorry for don't reply before, thanks so much michael, that works...and gary
for the explanation, now it's much more clear to me...thanks guys
El viernes, 30 de enero de 2015, 18:35:02 (UTC-4:30), coco escribió:
Hi everybody, I need implement this java code in clojure
public class MyWindow extends Window
{
public MyWindow()
{
super(My Window!);
}
}
MyWindow myWindow = new MyWindow();
unfortunately the clojure documentation for generate classes is not so
complete or straightforward for my understand...must I use gen-class or can
I use defrecord for this task?...how can I call super class
constructors??...
thanks
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Re: call superclass constructor in clojure class generation with defrecord
thanks Michael this does the job...in this code, now I've other doubt
public class MyWindow extends Window
{
public MyWindow() // --- not clear where I need declare it
{
super(My Window!);
Panel horizontalPanel = new Panel(new Border.Invisible(),
Panel.Orientation.HORIZONTAL);
Panel leftPanel = new Panel(new Border.Bevel(true),
Panel.Orientation.VERTICAL);
Panel middlePanel = new Panel(new Border.Bevel(true),
Panel.Orientation.VERTICAL);
Panel rightPanel = new Panel(new Border.Bevel(true),
Panel.Orientation.VERTICAL);
horizontalPanel.addComponent(leftPanel);
horizontalPanel.addComponent(middlePanel);
horizontalPanel.addComponent(rightPanel);
addComponent(horizontalPanel); // this is a confusing part too
}
}
in this code addComponent(horizontalPanel) is basically something like
this.addComponent(horizontalPanel)
does clojure have the this reference??...how can I call the
constuctor...I'm thinkingin something like this
(defn MyWindow []
(proxy [Window] [My windows!!]
(MyWindow [] (. this addComponent (Label. Bang!!)
is it wrong no? :D
thanks!!!
El viernes, 30 de enero de 2015, 18:47:48 (UTC-4:30), Michael Blume
escribió:
(defn my-window []
(proxy [Window] []))
should do the trick
Proxy takes a vector of implemented interfaces and at most one superclass
(in your case, Window), and then a second vector of arguments to pass to
the superclass constructor (in your case, an empty vector) and then a
series of methods implemented/overridden on the parent class/interfaces --
in your case there's none of those.
My understanding is that proxy is not quite as performant as
reify/defrecord, but it's the only game in town if you actually want to
subclass something.
Hope this helps =)
On Fri Jan 30 2015 at 3:05:11 PM coco clasespart...@gmail.com
javascript: wrote:
Hi everybody, I need implement this java code in clojure
public class MyWindow extends Window
{
public MyWindow()
{
super(My Window!);
}
}
MyWindow myWindow = new MyWindow();
unfortunately the clojure documentation for generate classes is not so
complete or straightforward for my understand...must I use gen-class or can
I use defrecord for this task?...how can I call super class
constructors??...
thanks
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call superclass constructor in clojure class generation with defrecord
Hi everybody, I need implement this java code in clojure
public class MyWindow extends Window
{
public MyWindow()
{
super(My Window!);
}
}
MyWindow myWindow = new MyWindow();
unfortunately the clojure documentation for generate classes is not so
complete or straightforward for my understand...must I use gen-class or can
I use defrecord for this task?...how can I call super class
constructors??...
thanks
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Re: noob question about error with tail recursion
now I'm in a similar trouble...I'm trying resolve the problem 31 from 4clojure ...It says: Write a function which packs consecutive duplicates into sub-lists. [image: test not run] (= (__ [1 1 2 1 1 1 3 3]) '((1 1) (2) (1 1 1) (3 3))) I know than I can use identity and others clojure functions but I wanna resolve this using loop too my idea is it: I've a mem..this is the final list than I will return and a temporary list... first I compare my first and second item and if these are the same I include it in my temp list if they are different then I include my temp list inside mem (a better name would be final_list) and clear my temp putting the second item in it I iterate until than my list become empty the code could be this: (defn packing [lista] (loop [[fst snd rst] listamem []tmp '(fst)] (if (seq? lista) (if (= fst snd) (recur (rest lista) mem (cons snd tmp)) (recur (rest lista) (conj mem tmp) (list snd))) (seq mem if I run this I get a java.lang.OutOfMemoryError: Java heap space (NO_SOURCE_FILE:0) It is tail recursive, I'm not sure if I can use 2 distinct recursions inside a loop but I think than must be possible..what am I doing wrong??... thanks so much -- 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
Re: noob question about error with tail recursion
yep..that is an error but (recur (rest rst) I think wouln't work...maybe something like (defn packing [lista] (loop [[fst snd :as all] listamem []tmp '(fst)] (print all is all \n\n) ;;something is wrong...all always is a empty list (if (seq? all) (if (= fst snd) (recur (rest all) mem (cons snd tmp)) (recur (rest all) (conj mem tmp) (list snd))) (seq mem something is still wrong..:( -- 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
noob question about error with tail recursion
Hi..I've a little problem using recur for recursive calling...I'm trying do the clojure koans and the recursive reverse function [1 2 3 4] - '(4 3 2 1) first I try this code: (defn recursive-reverse [coll] (loop [col coll mem '()] (if (empty? coll) mem ((cons (last col) mem) (recur (butlast col) mem) this didn't work and I thought the problem was (butlast col) and rewrite the code to this (defn recursive-reverse [coll] (loop [col (butlast coll) mem (list (last coll))] (if (empty? coll) mem ((cons (last col) mem) (recur col mem) why isn't a tail recur?...my recursion is de latest operation in the functin thanks so much I hope learn a lot about functional programming -- 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
Re: noob question about error with tail recursion
thanks for the answer, well, I rewrote the function lik this: (defn recursive-reverse [coll] (loop [col coll mem '()] (if (empty? col) mem (recur (rest col) (cons (first col) mem)) ))) I've a little logic problem but I fix it thanks On Nov 23, 12:54 am, Sean Corfield seancorfi...@gmail.com wrote: On Tue, Nov 22, 2011 at 8:49 PM, coco clasesparticulares...@gmail.com wrote: ((cons (last col) mem) (recur (butlast col) mem) ... ((cons (last col) mem) (recur col mem) In both of these, you have a function call with (cons (last col) mem) as the function... You're going to need (recur something something-else) as the else expression for recur to be in the tail position. HTH, -- Sean A Corfield -- (904) 302-SEAN An Architect's View --http://corfield.org/ World Singles, LLC. --http://worldsingles.com/ 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
Clojure vs Clisp...How big is the difference??
Hi everybody...I'm interested in learning clojure but there're only a few books and more focused to advanced programmers...I found today a nice book about Clisp but I don't know how different is itplease can tell if can be recommendable learn first Clisp with a easy follow book..or if there are many differences about these and It's not recommendable THANKS!! and greetings from Italy -- 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
