On Tuesday, 8 October 2013 11:13:24 UTC+5:30, Mark Hahn wrote:
>
> > a connect is successfully fired and after that an error is being fired
>
> I don't see why these multiple callbacks are a problem. They are
> happening exactly as they are supposed to if they are actually convenience
> callbacks for event emitters like http.createServer. You should handle
> each type of event appropriately.
>
>
@Mark
Yes I agree to it. But think like its a module to execute a mysql query. So
you are using a function *execute() *to execute a query. As an user why
will you expect your callback to be called multiple times? If there is a
error it should call it will an error or inform its successfully executed.
It shouldn't say the query is successfully executed and later call the
callback again with the error. Doesn't it make sense? Please correct me if
I am wrong. I am new to Nodejs
> You seem to have an irrational fear of multiple callbacks.
>
>
>
> On Mon, Oct 7, 2013 at 10:11 PM, jeevan kk <jeev...@gmail.com<javascript:>
> > wrote:
>
>> One of the common mistake which I have seen like this.
>>
>>
>> var connect = function(callback) {
>> var b = new Obj();
>> b.once('connect', function() {
>> callback.apply(null, []);
>> });
>>
>> b.once('error', function(error) {
>> callback.apply(null, [error]);
>> });
>>
>> b.once('timeout', function(error) {
>> callback.apply(null, [error]);
>> });
>>
>> };
>>
>> var execute = function (data, callback) {
>> connect(function(err) {
>> if(err) {
>> callback.apply(null, [err]);
>> return;
>> }
>>
>> //Do something,
>> callback.apply(null, []);
>> });
>> } ;
>>
>>
>> In this situation *execute() *is the function of the third party module
>> which I am using, and this callback gets called multiple times on some odd
>> situation. Most of the case its like a connect is successfully fired and
>> after that an error is being fired. By the time error is being called I
>> will have successfully completed all my operations. This is just a sample.
>>
>>
>>
>> On Wednesday, 2 October 2013 20:08:05 UTC+5:30, jmar777 wrote:
>>>
>>> In general, if you're seeing a callback invoked multiple times (when it
>>> clearly shouldn't), you're not going to want to mask that problem on your
>>> end. You might get it to where your own callback is only invoked once, but
>>> there can be some detrimental side effects on the other side. That being
>>> said, if you determine it's appropriate in your situation, I've got a
>>> callback utility that helps with things like callback timeouts, multiple
>>> calls, etc.: https://github.com/**jmar777/cb<https://github.com/jmar777/cb>
>>>
>>> On Tuesday, October 1, 2013 1:17:11 AM UTC-4, jeevan kk wrote:
>>>>
>>>> I am using different 3rd party modules in my project. I have seen, in
>>>> some odd situations the 3rd party module which I am using is calling the
>>>> callback multiple times.
>>>>
>>>> Is there any general approach which I can follow so avoid such
>>>> situations.
>>>>
>>> --
>> --
>> 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.com<javascript:>
>> 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.
