Re: Exception handling in receivers and listeners

Tim Fox wrote:
>
>
> Bela Ban wrote:
>> JGroups has callbacks for system events, like views and merging. If 
>> you through an exception in such a callback, JGroups will catch it 
>> and log it, but not propagate it.
>>
>> The other type of callbacks are methods which can be invoked as a 
>> result of a cluster wide method call. You can throw any type of 
>> exception, and JGroups will propagate them back to the caller
>
> Just to clarify. So if I throw an exception in a 
> RequestHandler::handle() method or Receiver::receive() method then it 
> will get propagated back to the thread that either invoked 
> MessageDispatcher::castMessage() or Channel::send()?

Yes and no. An exception thrown in handle() will be returned as part of 
the RspList for MessageDispatcher.castMessage(), but it will *not* be 
thrown. An exception in receive() will *not* be returned to the caller, 
but simply logged.


> Bela, you say I can throw any exception but the signature of the 
> methods are not declared to throw any exceptions, so I assume you mean 
> I can throw any *unchecked* exception?

Yes

-- 
Bela Ban
Lead JGroups / Manager JBoss Clustering Group
JBoss - a division of Red Hat

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