quoting docs:
When an EventEmitter instance experiences an error, the typical action is
to emit an 'error' event. Error events are treated as a special case in
node. If there is no listener for it, then the default action is to print a
stack trace and exit the program.
2013/2/25 Glenn Block <glenn.bl...@gmail.com>
> Jose, thanks for the clarification.
>
> Literally right after sending the mail I was thinking I forgot all about
> event emitters :-)
>
> In terms of error, are you saying that any time you emit an event called
> "Error" the runtime exits if there is no listener?
>
>
>
>
> On Mon, Feb 25, 2013 at 3:12 AM, José F. Romaniello <
> jfromanie...@gmail.com> wrote:
>
>> +1 on event emitter. Callback with an array of errors is not that common.
>> You should return an event emitter with complete and error events. be
>> aware that when you emit an 'error' event and no one is listening in the
>> application exits
>>
>>
>> 2013/2/25 Pedro Teixeira <pedro.teixe...@gmail.com>
>>
>>> Hey Glenn,
>>>
>>> For something this complex I think an event emitter may be better suited.
>>>
>>> --
>>> Pedro
>>>
>>> On Monday, February 25, 2013 at 9:57 AM, Glenn Block wrote:
>>>
>>> Hello all
>>>
>>> Let's assume you have an API that results in a batch of HTTP calls which
>>> fire async and which are not sequential. A constraint of the API is that
>>> any errors that occur during the calls need to get returned to the user.
>>>
>>> How have you customarily designed this?
>>>
>>> One idea was something like the following
>>>
>>> function send(message, callback) {
>>> }
>>>
>>> where callback is function(error, results) {
>>> }
>>>
>>> In this case error if not null is a JSON object with a collection of
>>> child objects with the errors.
>>>
>>> An alternative idea I had was to have an additional completion callback
>>> per item.
>>>
>>> so:
>>>
>>> function send(message, completionCallback, itemCallback) {
>>> }
>>>
>>> This introduces a callback for each item that is processed. In this case
>>> the completion callback has a single error if ANY errors occur while the
>>> itemCallback has individual errors as they occur.
>>>
>>> This is useful for cases where you might want to stop further processing
>>> if the number of errors is very high.
>>>
>>> Thoughts / Experiences?
>>> Glenn
>>>
>>>
>>>
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>>
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