[jira] [Created] (ARIES-2113) TCP provider doesn't distinguish returned value from thrown exceptions

["Amichai Rothman (Jira)" <ji...@apache.org>]

Amichai Rothman created ARIES-2113:
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             Summary: TCP provider doesn't distinguish returned value from thrown exceptions
                 Key: ARIES-2113
                 URL: https://issues.apache.org/jira/browse/ARIES-2113
             Project: Aries
          Issue Type: Bug
          Components: Remote Service Admin
    Affects Versions: rsa-1.16.1
            Reporter: Amichai Rothman


The TCP provider currently returns a single object from the remote invocation, which can be either the result object or an exception. While this works in most cases, it is technically incorrect since a method can return an exception object without throwing it so the two cases should be treated differently. It should return both an exception (which is rethrown if not null) and the result object (which is returned to caller normally even if it is a Throwable).

Furthermore, when an exception is thrown/returned, there is ambiguity between an exception thrown by the invoked method implementation itself (which should be thrown transparently to the caller) and those caused by the provider (bugs or otherwise which should probably be remote ServiceExceptions). A simple solution is to always wrap method implementation exceptions in an InvocationTargetException (as invoke already does but the async result resolution does not) and other provider exceptions (explicit or implicit) thrown as-is. The receiver can then distinguish the two and process them differently if necessary.



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