Re: Exception handling in receivers and listeners

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()?

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?


> 
> Tim Fox wrote:
>> Hi again
>>
>> In RequestHandler, Receiver, MessageListener or MembershipListener 
>> methods which are invoked by JGroups when some event has occurred, if 
>> an exception is thrown in the handler code, is it proper practice to 
>> catch the exceptions and deal with them locally (log them?).
>>
>> Or is it permissible to wrap them in a RuntimeException and propagate 
>> it back into JGroups - if this happens - what does JGroups do with the 
>> exception - log it, ignore it or pass it back to the caller? (I guess 
>> passing back to the caller would only make sense for synchronous 
>> invocations made using messsage dispatcher)
>>
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> 

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642