[cdi-dev] API for dispatching of async events

[Martin Fryč]

Hi,
more than deadlock I meant that quickly processed events (calculations,
verifications, ...) will be mixed in queue with slowly processed events
(writing to FS, WS call, ...) and application could be interested only in
result of "quick" events and doesn't care, when slow one will be finished
(eg. logging, ...). It will cause to take unnecessary time for request
processing.

If application will be able to tell to async event "dispatcher", process
this type of events on this executor, another type by this one and rest by
this one, they won't be mixed in queue of one executor. Application will be
then able to dedicate executor for processing of events needed for
finishing of request processing and another for events which could be done
even after request processing will be finished.

King regards,
Martin Fryč

On Sun, Mar 15, 2015 at 6:46 PM, arjan tijms <arjan.tijms at gmail.com> wrote:

> Hi,
>
> On Sun, Mar 15, 2015 at 11:21 AM, Martin Fryč <martin at fryc.eu> wrote:
>
>> If async events will be processed in similar way as async EJB methods -
>> usually implemented in app servers as one shared thread pool with limited
>> application control (discard policy, ...), both of these events will share
>> one thread pool and some type of events could fully blocked it and "stop"
>> application.
>>
>
> Indeed, especially if it will be possible to wait for all async events to
> have completed, the risk for deadlock is very real.
>
> This was explained in some more detail here:
> https://java.net/jira/browse/EJB_SPEC-9?focusedCommentId=345825&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-345825
>
> Kind regards,
> Arjan Tijms
>
>
>
>>
>> If threre will be some policy API like:
>>
>> java.util.concurrent.ExecutorService dispatch(T event, Annotation...
>> qualifiers)
>>
>> it will allow application to decide which thread pool should be used for
>> which type of event.
>> In EE environment, it must be ManagedExecutorService looked it up from
>> JNDI, in SE environment it could be ExecutorService created for
>> applications needs.
>>
>> Martin
>>
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>
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