[jira] [Updated] (QPID-6694) Ensure that future wiring within async model operations preserves exceptions

["Keith Wall (JIRA)" <ji...@apache.org>]

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

Keith Wall updated QPID-6694:
-----------------------------
    Summary: Ensure that future wiring within async model operations preserves exceptions  (was: Ensure that future wiring within async model operations preserve exceptions)

> Ensure that future wiring within async model operations preserves 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}
> public ListenableFuture<Void> doMyStateChangeOp() 
> {
>   final SettableFuture<Void> returnVal = SettableFuture.create();
>   ListenableFuture opFuture = operationAsync();
>   opFuture.addListener(new Runnable()
>   {
>                 // some code
>                 returnVal.set(null);
>   });
>   return returnVal;
> }
> {code} 
> where #addListener executes the Runnable when the future opFuture completes, successfully or otherwise.  The idiom suffers from the fact that opFuture if contains an exception, the exception itself is lost.  The caller who receives returnVal gets a success future and the exception is effectively swallowed.
>  



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