Hi Martin.
My mistake. I thought the EventImpl was ignoring
ExecutorServices#getTaskExecutor() but after reading your email I checked
again and found it later down the stack, and upon further investigation
the Executor we're providing doesn't handle what I was told it would,
which means it can be fixed. Thanks for your help.
P.S. The NPE is CDI.current() returning null, then a method is called on
that null. It's the result of some ThreadLocals not being set inside our
code.
From: Martin Kouba
To: Benjamin Confino , weld-dev@lists.jboss.org
Cc: Tom Evans , Emily Jiang
Date: 18/07/2018 08:18
Subject:Re: [weld-dev] Should EventImpl.fireAsync use
ExecutorServices from the ServiceRegistry
Hi Benjamin,
If no Executor is provided - either fireAsync(U event) or no executor
set to the notification options - Weld uses the Executor returned from
org.jboss.weld.manager.api.ExecutorServices#getTaskExecutor() or
ForkJoinPool#commonPool() if no ExecutorServices is registered. In other
words, it's up to the integrator which Executor is used.
And yes, Event#fireAsync(U, NotificationOptions) javadoc is outdated -
in the first versions it was only possible to pass an Executor.
What does the NPE look like?
Thanks,
Martin
Dne 17.7.2018 v 18:30 Benjamin Confino napsal(a):
> Hello
>
> I have a customer with the following
>
> @Inject
> Event event;
>
> @Resource
> ManagedExecutorService threadPool;
>
> public void fireAsyncEvent() {
>System.out.println("Sending Async-Message via CDI");
>event.fireAsync(new Message("Hello"));
> }
>
> public void fireAsyncEvent_2() {
>event.fireAsync(new Message("Hello"),
> NotificationOptions.ofExecutor(threadPool));
> }
>
> fireAsyncEvent() eventually results in an NPE when a JSF class attempts
> tries to call CDI.current() fireAsyncEvent_2() works correctly. I was
> hoping that it would be possible to fix fireAsyncEvent to remove the
> dependency on passing in an executor service every time it is used.
>
> We currently set an executor service into the weld service registry, and
> I was wondering if org.jboss.weld.event.EventImpl fetch the executor
> service from the service registry. Either only when fireAsync is called
> without any NotificationOptions, or perhaps more aggressively and set
> the default executor service if NotificationOptions are provided but do
> not explicitly contain an executor service (The javadoc is unclear, but
> I believe calling ofExecutor() provides this functionality).
>
> Before going further with this I wanted to ask for a quick sanity check.
> Is this fix plausible?
>
> Regards
> Benjamin
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with number
> 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
3AU
>
>
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--
Martin Kouba
Senior Software Engineer
Red Hat, Czech Republic
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
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