[cdi-dev] [JBoss JIRA] (CDI-650) Introduce asynchronous event notification options

[Martin Kouba (JIRA)]

Martin Kouba created CDI-650:
--------------------------------

             Summary: Introduce asynchronous event notification options
                 Key: CDI-650
                 URL: https://issues.jboss.org/browse/CDI-650
             Project: CDI Specification Issues
          Issue Type: Feature Request
            Reporter: Martin Kouba
            Assignee: Martin Kouba
             Fix For: 2.0 .Final


Currently, it's only possible to provide a custom executor when firing an event asynchronously - see also {{javax.enterprise.event.Event.fireAsync(U, Executor)}}. It might be useful to provide other implementation-specific options, e.g. notification timeout.

Therefore, I suggest to introduce {{NotificationOptions}} interface:
{code:java}
public interface NotificationOptions {
    Executor getExecutor();
    // Implementation-specific options
    Object get(String optionName);
}
{code}
and change the method signature to:
{code:java}
<U extends T> CompletionStage<U>  fireAsync(U event, NotificationOptions options);
{code}

In the future, if any implementation-specific configuration proves to be useful and worth standardizing, we may simply add a new method to {{NotificationOptions}}, e.g. 
{code:java}
Duration getTimeout();
{code}
instead of adding more and more params to {{Event.fireAsync()}}.

We could also introduce some convenient static methods on {{NotificationOptions}}, e.g.:
{code:java}
void fireEvents(Event event, Executor executor) {
    event.fireAsync(new Foo(), NotificationOptions.ofExecutor(executor));
}
{code}



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