Reliable Notification
I have a pretty simple problem I'd like to solve, but the tool I think
I should use is not being cooperative.
I have a client that has to deliver a message to at least one server
within a reasonable time.
Based on that requirement I though I should use MEP InOnly and
Sandesha2 (Reliable Messaging). The problem is that I need to know
that the message arrived and I can't seem to get that using Sandesha
and the InOnly pattern. All I really want from the service is an ACK
that I can pick up somehow at the client. Clearly this is part and
parcel of what Sandesha does... I just want to know about it.
A couple of thoughts came up:
1. Manually check via the SequenceReport. (never see anything in the
Outgoing Sequence Report)
2. Use a SandeshaListener (callbacks for onError and onTimeout). I
tried running client w/ server down. No luck.
3. SandeshaClient.waitUntilSequenceCompleted works but who wants to
block? And if it does time out I still want to be notified.
None of these fullfill the basic requirement: within a reasonable
about of time, I want to know, at the client, that the message has
been received at the service.
FYI I am using the Sandesha2 UserguideEchoClient client - the code w/ my
additions are here.
clientOptions.setTo(new EndpointReference (toEPR));
ServiceClient serviceClient = new ServiceClient
(configContext,null);
clientOptions.setAction("urn:wsrm:Ping");
serviceClient.setOptions(clientOptions);
clientOptions.setProperty(SandeshaClientConstants.SANDESHA_LISTENER,
new SandeshaListener_Impl());//new
clientOptions.setTimeOutInMilliSeconds(1);//trying to cause it
to timeout, but it doesn't.
serviceClient.fireAndForget(getPingOMBlock("ping1"));
serviceClient.fireAndForget(getPingOMBlock("ping2"));
clientOptions.setProperty(SandeshaClientConstants.LAST_MESSAGE,
"true");
serviceClient.fireAndForget(getPingOMBlock("ping3"));
SandeshaClient.waitUntilSequenceCompleted(serviceClient,1000*50);//new
serviceClient.finalizeInvoke();
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