[infinispan-issues] [JBoss JIRA] (ISPN-5849) AutoCloseable return from adding listeners can be clunky to use

[Tristan Tarrant (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-5849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tristan Tarrant updated ISPN-5849:
----------------------------------
    Fix Version/s: 9.0.0.Alpha3
                       (was: 9.0.0.Alpha2)


> AutoCloseable return from adding listeners can be clunky to use
> ---------------------------------------------------------------
>
>                 Key: ISPN-5849
>                 URL: https://issues.jboss.org/browse/ISPN-5849
>             Project: Infinispan
>          Issue Type: Sub-task
>            Reporter: Galder Zamarreño
>            Assignee: Galder Zamarreño
>             Fix For: 9.0.0.Alpha3
>
>
> On one side, to use it as a try-with-resource, you need to declare it right in the {{try()}};
> {code}
>       try(AutoCloseable handler = writeOnlyMap.listeners().onWrite(written ->
>             System.out.printf("Written (via onWrite): %s%n", written.get()))) {
>          Map<String, String> entries = new HashMap<>();
>          entries.put("key1", "value1");
>          entries.put("key2", "value2");
>          writeOnlyMap.evalMany(entries, (v, writeView) -> writeView.set(v))
>             .get(); // Wait for completable future
>       }
> {code}
> So it's usability is mostly designed for unit tests since listeners tend to be set and removed at a later stage. IOW, listeners are not generally a short-lived object.
> The other aspect that is clunky to use is the fact that AutoCloseable's close() throws Exception, which again makes it ackward to use for example if lambdas.



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