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From "Keith Wall (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (QPID-6694) Ensure that future wiring within async model operations preserve exceptions
Date Fri, 14 Aug 2015 12:20:45 GMT

     [ https://issues.apache.org/jira/browse/QPID-6694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Keith Wall updated QPID-6694:
-----------------------------
    Affects Version/s: qpid-java-6.0

> Ensure that future wiring within async model operations preserve exceptions
> ---------------------------------------------------------------------------
>
>                 Key: QPID-6694
>                 URL: https://issues.apache.org/jira/browse/QPID-6694
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker
>    Affects Versions: qpid-java-6.0
>            Reporter: Keith Wall
>             Fix For: qpid-java-6.0
>
>
> We have a number of cases in asynchronous model operations where we chain code to run
after a future completes, returning a future to the caller that completes once the chained
code completes.
> The idiom looks like this:
> {code:java}
> final SettableFuture<Void> returnVal = SettableFuture.create();
> ListenableFuture opFuture = operationAsync();
> opFuture.addListener(new Runnable()
> {
>                 // some code
>                 returnVal.set(null);
> });
> {code} 
> where #addListener executes the Runnable when the future opFuture completes, successfully
or otherwise.  The idiom suffers from the fact that opFuture contains an exception, the exception
itself is lost.  The caller who receives returnVal gets a successfully future and the exception
is effectively swallowed.
>  



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