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javatibco-rv

Creating TIBCO Rendezvous Listener wait for response on different subject and candidate event key


Messages published and response received are on two different subjects. Right now I have following set of functionality in my java class. Class is implementing TibrvMsgCallback interface. How can i make sure that whatever the message is published i am receiving exactly its response?

public class TibcoRVUtility implements TibrvMsgCallback {
    public void onMsg(TibrvListener listener, TibrvMsg msg) {
           try {
                _log.info("Request and Response found");

                msgReceived = true;
        } catch (final TibrvException ex) {
            _log.error("Exception@" + this.getClass().getName() + ".onMsg", ex);
        }
    }

    private void sendMessage(String messageString, final String soType,
            final String responseSubject) {
        try {

            Tibrv.open(Tibrv.IMPL_NATIVE);

            TibrvTransport transport = new TibrvRvdTransport(tibcoSetting.getService(), tibcoSetting.getNetwork(),
                    tibcoSetting.getDaemon());
            String inboxName = transport.createInbox();

            TibrvMsg msg = new TibrvMsg();
            msg.setSendSubject("PUBLISH_SUBJECT");
            msg.add("DATA", "DUMMY_MESSAGE");

            TibrvListener listener = new TibrvListener(Tibrv.defaultQueue(), this, transport, responseSubject, null);

            transport.send(msg);

            _log.info("msg" + msg.toString());
            _log.info("message successfully sent.");
            while (!msgReceived) {
                try {
                    Tibrv.defaultQueue().dispatch();
                } catch (InterruptedException ex) {
                    _log.error("Exception@" + this.getClass().getName() + ".sendMessage", ex);
                    break;
                } catch (TibrvException ex) {
                    _log.error("Exception@" + this.getClass().getName() + ".sendMessage", ex);
                    break;
                }
            }

            listener.destroy();
            transport.destroy();

        } catch (TibrvException e) {
            _log.error("Exception@" + this.getClass().getName() + ".sendMessage", e);
        }
    }
}

Solution

  • When you send a message, add another field

    var correlation_id = Guid.NewGuid().ToString();
    msg.add("CORRELATION_ID", correlation_id);
    

    and then stash that correlation ID somewhere, in a hash set perhaps.

    Have the publisher read the CORRELATION_ID off of the request and add it to the response.

    When you receive a message, only process it if it has the ID that you are expecting in the CORRELATION_ID field.