Re: [nodejs] Re: how to create a singleton
Sure that's the common explanation, but don't fall for it: globality has everything to do with it. If the singleton didn't care about creating global state, it could just have `this.created = true;` for its *only* internal state and have thrown exceptions from the constructor for any subsequent calls. That's the simplest way to ensure that only one instance gets constructed. In the browser, where there's no module system to stop your global variables from spraying everywhere, any singleton can just as safely be replaced by a simple single global instance instantiated normally. There's absolutely no difference in control or globality whatsoever, and you get better performance by not making completely unnecessary getInstance() calls just to get your instance. The singleton pattern is really nothing more than a hack to get globals into java via the global class namespace. Even in java, it's pretty common to solve the same problems with IoC containers now instead of singletons, because global state is generally considered A Bad Thing (unless used extremely judiciously). G On Tue, Nov 26, 2013 at 9:50 PM, dhtml dhtmlkitc...@gmail.com wrote: On Thursday, November 21, 2013 7:13:48 AM UTC-8, Gregg Caines wrote: So how do you achieve the same effect in javascript? In the browser, you have globals. The global object has nothing to do with web browsers. If you want just one instance of a thing, create it, and set it to a global variable. You can use that global variable everywhere. (If you're thinking but global variables are bad!, I mostly agree. This is one of the reasons that the singleton itself is actually considered an anti-pattern by many. Singleton is necessary when the program must have at most one instance of an object; where having two would be a problem. In javascript, it's well-used where the initialization of that one object needs some variables or configuration to initialize itself. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to a topic in the Google Groups nodejs group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/nodejs/GmUto9AN47U/unsubscribe. To unsubscribe from this group and all its topics, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [nodejs] Re: how to create a singleton
I'm not 100% sure of your requirements, but this is what I assume you're
after:
-
file : soapClient.js
var memoizedClient;
var soap = require('soap');
var create = function (cb){
if (memoizedClient){
return cb(null, memoizedClient);
}
var url = http://172.31.19.39/MgmtServer.wsdl;;
var endPoint = https://172.31.19.39:9088;;
var options = {};
options.endpoint = endPoint;
soap.createClient(url, options, function(err, result) {
if (err) {
return cb(null, memoizedClient); // pass errors properly! :)
}
setSecurity(new soap.BasicAuthSecurity('admin-priv', 'password'));
memoizedClient = result;
cb(null, result);
});
exports.create = create;
exports.client = memoizedClient; // I don't do this, but I think it's what
you're looking for
-
file: someClientCode.js
var client;
require('soapClient').create(function(err, client){
// do stuff here
});
-
ALSO:
If you're somehow sure that you've already called create() previously, you
could just do:
var client = require('soapClient').client;
// do stuff here
I know that's a hell of a lot prettier, but I usually don't do that because
I like to not
have to worry about whether i've called create() or not. I just call
create() everytime, and
suck up the fact that there's a callback. In the cases that I'd use this
pattern like you are
using it, it's ONLY because I'd like to not have to incur the network cost
of the asynch call
everywhere I use it, and not because I want fewer indentations in my code.
I do this with
database connection pools as well, for example, because those shouldn't be
created over
and over for every use. So in short, ALL of this hinges on my assumption
that
soap.createClient involves a network call that you don't want to repeat
everytime you
want to make a soap request. Otherwise, there's no good reason to memoize
(cache state).
Often I put a setter on the memoizedClient as well because it works nicely
for dependency
injection in unit tests.
S... I think I have to admit in retrospect that this is indeed a
singleton. At least this
way you can be more idiomatic than any general javascript singleton code
I've seen.
(I never ran any of this code, so it's probably broken in 14 ways)
Hope that helps,
G
On Thu, Nov 21, 2013 at 9:03 AM, Reza Razavipour
reza.razavip...@gmail.comwrote:
Ok so this is the way i have it constructed... SoapClient is my module and
I want it to be used as a singleton, i.e. if it is initialized, it just
returns the connection, or SoapClient.instance...
var SoapClient = function() {
var soap = require('soap');
this.init = function (){
var url = http://172.31.19.39/MgmtServer.wsdl;;
var endPoint = https://172.31.19.39:9088;;
var options = {};
options.endpoint = endPoint;
soap.createClient(url, options, function(err, result) {
if (err) {
console.log('soap client create failed ' + err);
return;
}
console.log('init is called ready');
SoapClient.instance = result;
SoapClient.instance.setSecurity(new soap.BasicAuthSecurity(
'admin-priv', 'password'));
});
};
};
SoapClient.getInstance = function () {
if (SoapClient.instance) {
return SoapClient.instance;
}
new SoapClient().init();
return SoapClient.instance;
};
SoapClient.instance = null;
module.exports = SoapClient;
Thoughts
On Thursday, November 21, 2013 8:34:14 AM UTC-8, Reza Razavipour wrote:
this I get the jist of the conversation but my Javascript skills, less
than 2 months, does not allow me to be able to code this up.
Also, as a starter in the new language the last thing I want to do is to
miss out on the language correct way of things and force lets say the Java
way of doing things in JS.
Can you show me a skeleton of such function and a tiny consumer of that?
The reason I say that is the fact that all of the examples are all done in
the same JS file and not setup as module and when I try to change to a
module and a consumer, I run into syntax problems and
I do not understand the difference between a class exporting an object as
opposed to a constructor
Thank you so much for showing me the correct way
On Thursday, November 21, 2013 7:37:32 AM UTC-8, Kamil Leszczuk wrote:
Aah, nevermind then, I misunerstood ;)
21 lis 2013 16:36 Gregg Caines gr...@caines.ca napisał(a):
Yeah... that's what I'm saying :)
G
On Thu, Nov 21, 2013 at 7:33 AM, Kamil Leszczuk kami...@gmail.comwrote:
For example, if I have a module for emailing with a send() method on
it, I don't have it export a constructor; I have it export an object.
That
object might maintain some state or it might not. When the module is
subsequently require()'d, it will have any state that it has accumulated
since.
For.most of the time, that's unnecessary - multiple require() calls
for the same module return same, cached module, so you can store state
Re: [nodejs] Re: how to create a singleton
For example, if I have a module for emailing with a send() method on it, I don't have it export a constructor; I have it export an object. That object might maintain some state or it might not. When the module is subsequently require()'d, it will have any state that it has accumulated since. For.most of the time, that's unnecessary - multiple require() calls for the same module return same, cached module, so you can store state just by using local variables in that module. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [nodejs] Re: how to create a singleton
this I get the jist of the conversation but my Javascript skills, less than 2 months, does not allow me to be able to code this up. Also, as a starter in the new language the last thing I want to do is to miss out on the language correct way of things and force lets say the Java way of doing things in JS. Can you show me a skeleton of such function and a tiny consumer of that? The reason I say that is the fact that all of the examples are all done in the same JS file and not setup as module and when I try to change to a module and a consumer, I run into syntax problems and I do not understand the difference between a class exporting an object as opposed to a constructor Thank you so much for showing me the correct way On Thursday, November 21, 2013 7:37:32 AM UTC-8, Kamil Leszczuk wrote: Aah, nevermind then, I misunerstood ;) 21 lis 2013 16:36 Gregg Caines gr...@caines.ca javascript: napisał(a): Yeah... that's what I'm saying :) G On Thu, Nov 21, 2013 at 7:33 AM, Kamil Leszczuk kami...@gmail.comjavascript: wrote: For example, if I have a module for emailing with a send() method on it, I don't have it export a constructor; I have it export an object. That object might maintain some state or it might not. When the module is subsequently require()'d, it will have any state that it has accumulated since. For.most of the time, that's unnecessary - multiple require() calls for the same module return same, cached module, so you can store state just by using local variables in that module. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nod...@googlegroups.comjavascript: To unsubscribe from this group, send email to nodejs+un...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to a topic in the Google Groups nodejs group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/nodejs/GmUto9AN47U/unsubscribe. To unsubscribe from this group and all its topics, send an email to nodejs+un...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nod...@googlegroups.comjavascript: To unsubscribe from this group, send email to nodejs+un...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+un...@googlegroups.com javascript:. For more options, visit https://groups.google.com/groups/opt_out. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [nodejs] Re: how to create a singleton
I recommend being wary of any broad generalizations about programming patterns :P Rick On Thu, Nov 21, 2013 at 7:13 AM, Gregg Caines cai...@gmail.com wrote: The singleton pattern is actually unnecessary in most languages outside of java, including javascript. You should be wary of any javascript book that tries to teach you singletons at all. Many of those gang of four patterns simply don't translate outside of java and c++ (eg if you want to implement command, strategy, or factory patterns, you should really first check out javascript's first class functions.). So how do you achieve the same effect in javascript? In the browser, you have globals. If you want just one instance of a thing, create it, and set it to a global variable. You can use that global variable everywhere. (If you're thinking but global variables are bad!, I mostly agree. This is one of the reasons that the singleton itself is actually considered an anti-pattern by many. In node, the module system is a global namespace that can maintain state, so that's the appropriate way to achieve the same effect. I do this in node applications all the time. For example, if I have a module for emailing with a send() method on it, I don't have it export a constructor; I have it export an object. That object might maintain some state or it might not. When the module is subsequently require()'d, it will have any state that it has accumulated since. All of this is a bit hairy because we're talking about global state (which is the main impetus for singletons, when you get right down to it). Whatever you decide to do though, keep in mind that writing idiomatic code in any language means using the features of that language, and not translating java/C++ idioms into it. It will be an extremely rare javascripter that will want to work on your code if you've got singletons in it. G On Monday, November 18, 2013 3:38:09 PM UTC-8, Reza Razavipour wrote: A newbie question... I have an app that connects and reuses the same connection to a remote database and a connection to a remote soap server. I want to implement a singleton pattern for each of these. I am used to doing that in C++ and Java but want to know what the standard implementation for a Singleton pattern is in node.js. Any recommendations or references. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [nodejs] Re: how to create a singleton
Ok so this is the way i have it constructed... SoapClient is my module and
I want it to be used as a singleton, i.e. if it is initialized, it just
returns the connection, or SoapClient.instance...
var SoapClient = function() {
var soap = require('soap');
this.init = function (){
var url = http://172.31.19.39/MgmtServer.wsdl;;
var endPoint = https://172.31.19.39:9088;;
var options = {};
options.endpoint = endPoint;
soap.createClient(url, options, function(err, result) {
if (err) {
console.log('soap client create failed ' + err);
return;
}
console.log('init is called ready');
SoapClient.instance = result;
SoapClient.instance.setSecurity(new soap.BasicAuthSecurity(
'admin-priv', 'password'));
});
};
};
SoapClient.getInstance = function () {
if (SoapClient.instance) {
return SoapClient.instance;
}
new SoapClient().init();
return SoapClient.instance;
};
SoapClient.instance = null;
module.exports = SoapClient;
Thoughts
On Thursday, November 21, 2013 8:34:14 AM UTC-8, Reza Razavipour wrote:
this I get the jist of the conversation but my Javascript skills, less
than 2 months, does not allow me to be able to code this up.
Also, as a starter in the new language the last thing I want to do is to
miss out on the language correct way of things and force lets say the Java
way of doing things in JS.
Can you show me a skeleton of such function and a tiny consumer of that?
The reason I say that is the fact that all of the examples are all done in
the same JS file and not setup as module and when I try to change to a
module and a consumer, I run into syntax problems and
I do not understand the difference between a class exporting an object as
opposed to a constructor
Thank you so much for showing me the correct way
On Thursday, November 21, 2013 7:37:32 AM UTC-8, Kamil Leszczuk wrote:
Aah, nevermind then, I misunerstood ;)
21 lis 2013 16:36 Gregg Caines gr...@caines.ca napisał(a):
Yeah... that's what I'm saying :)
G
On Thu, Nov 21, 2013 at 7:33 AM, Kamil Leszczuk kami...@gmail.comwrote:
For example, if I have a module for emailing with a send() method on
it, I don't have it export a constructor; I have it export an object.
That
object might maintain some state or it might not. When the module is
subsequently require()'d, it will have any state that it has accumulated
since.
For.most of the time, that's unnecessary - multiple require() calls for
the same module return same, cached module, so you can store state just by
using local variables in that module.
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Re: [nodejs] Re: how to create a singleton
Aah, nevermind then, I misunerstood ;) 21 lis 2013 16:36 Gregg Caines gr...@caines.ca napisał(a): Yeah... that's what I'm saying :) G On Thu, Nov 21, 2013 at 7:33 AM, Kamil Leszczuk kamit...@gmail.comwrote: For example, if I have a module for emailing with a send() method on it, I don't have it export a constructor; I have it export an object. That object might maintain some state or it might not. When the module is subsequently require()'d, it will have any state that it has accumulated since. For.most of the time, that's unnecessary - multiple require() calls for the same module return same, cached module, so you can store state just by using local variables in that module. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to a topic in the Google Groups nodejs group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/nodejs/GmUto9AN47U/unsubscribe. To unsubscribe from this group and all its topics, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [nodejs] Re: how to create a singleton
Yeah... that's what I'm saying :) G On Thu, Nov 21, 2013 at 7:33 AM, Kamil Leszczuk kamit...@gmail.com wrote: For example, if I have a module for emailing with a send() method on it, I don't have it export a constructor; I have it export an object. That object might maintain some state or it might not. When the module is subsequently require()'d, it will have any state that it has accumulated since. For.most of the time, that's unnecessary - multiple require() calls for the same module return same, cached module, so you can store state just by using local variables in that module. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to a topic in the Google Groups nodejs group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/nodejs/GmUto9AN47U/unsubscribe. To unsubscribe from this group and all its topics, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups nodejs group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups nodejs group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [nodejs] Re: how to create a singleton
yeah that's right. You just need to add the line
module.exports = mySingleton
and in the caller file require as follows
var singleton = require('./single').mySingleton
Hope that helps
José
On Nov 19, 2013, at 2:40 AM, Reza Razavipour reza.razavip...@gmail.com wrote:
Wonderful book, thank you.
So reading the book, if I put the code for the mySingleton class into a file
on its own, call it single.js.
In my main.js, I add that with a require statement, such as var singleton =
require('./.single);
when I say, singleton.getInstance(), I get a compile error saying singleton
does not have a getInstance function...
Do I have to add an export to the single.js file I created or what am I
missing...
The code is as follows:
var mySingleton = (function() {
var instance;
function init() {
var privateRandomNumber = Math.random();
return {
publicMethod : function() {
console.log(The public can see me!);
},
publicProperty : I am also public,
getRandomNumber : function() {
return privateRandomNumber;
},
getInstance : function() {
if (!instance) {
instance = init();
}
return instance;
}
};
};
return {
getInstance : function() {
if (!instance) {
instance = init();
}
return instance;
}
};
})();
Thanks for the help.
Reza
On Monday, November 18, 2013 3:38:09 PM UTC-8, Reza Razavipour wrote:
A newbie question...
I have an app that connects and reuses the same connection to a remote
database and a connection to a remote soap server.
I want to implement a singleton pattern for each of these. I am used to doing
that in C++ and Java but want to know what the standard
implementation for a Singleton pattern is in node.js.
Any recommendations or references.
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