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| /* MinSrc.java, see http://ultramessaging.github.io/UMExamples/minsrc/java/ */
import com.latencybusters.lbm.*;
public class request_response {
public static int run = 1;
public static void main(String[] args) throws LBMException
{
/* Initialization: create necessary UM objects. */
LBMContext ctx = new LBMContext();
/* Initialize and create receiver and receiver callback */
ReceiverCallback myReceiverCallback = new ReceiverCallback();
LBMReceiverAttributes rcv_attr = new LBMReceiverAttributes();
LBMTopic rtopic = new LBMTopic(ctx, "test.topic", rcv_attr);
LBMReceiver rcv = new LBMReceiver(ctx, rtopic, myReceiverCallback, null);
/* Initialize and create source */
LBMTopic stopic = new LBMTopic(ctx, "test.topic", new LBMSourceAttributes());
LBMSource src = new LBMSource(ctx, stopic);
LBMRequest req = new LBMRequest("Request".getBytes(), "Request".length());
ResponseCallback myResponseCallback = new ResponseCallback();
req.addResponseCallback(myResponseCallback);
/* Sleep for 1 second to allow TR to complete */
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
/* Send a message. */
src.send(req, LBM.MSG_FLUSH | LBM.SRC_BLOCK);
while (run == 1) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
}
/* Cleanup: delete UM objects. */
req.close();
src.close();
rcv.close();
ctx.close();
} /* main */
/* Class for receiving messages */
private static class ReceiverCallback implements LBMReceiverCallback {
public int onReceive(Object cbArg, LBMMessage msg)
{
switch (msg.type())
{
case LBM.MSG_REQUEST:
System.out.println("Request Received");
try {
msg.respond("Response".getBytes(), "Response".length(), LBM.SRC_NONBLOCK);
}
catch (LBMException ex)
{
System.err.println("Error responding to request: " + ex.toString());
}
break;
}
return 0;
}
} /* ReceiverCallback */
/* Class for receiving responses */
private static class ResponseCallback implements LBMResponseCallback {
public int onResponse(Object cbArg, LBMRequest req, LBMMessage msg)
{
switch (msg.type())
{
case LBM.MSG_RESPONSE:
System.out.println("Response Received");
run = 0;
break;
}
return 0;
}
} /* ResponseCallback */
} /* class MinSrc */
|