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| /* SeqNumberCallback.java, see http://ultramessaging.github.io/UMExamples/seq_number_callback/java/ */
import com.latencybusters.lbm.*;
import java.lang.*;
public class SeqNumberCallback {
public static void main(String[] args) throws LBMException {
LBMContext ctx = null; /* Context object: container for UM "instance". */
LBMReceiver rcv = null; /* Receiver object: for receiving messages. */
LBMTopic rtopic = null; /* Topic object */
LBMReceiverAttributes rcv_attr; /* Receiver attribute object */
/* Initialize and create receiver and receiver callback */
ReceiverCallback myReceiverCallback = new ReceiverCallback();
/*** Initialization: create necessary UM objects. ***/
ctx = new LBMContext();
rcv_attr = new LBMReceiverAttributes();
UMERcvRecInfo umerecinfocb = new UMERcvRecInfo();
rcv_attr.setRecoverySequenceNumberCallback(umerecinfocb, null);
rtopic = new LBMTopic(ctx, "test.topic", rcv_attr);
rcv = new LBMReceiver(ctx, rtopic, myReceiverCallback, null);
while(true)
{
}
} /* main */
/* Class for receiving messages */
private static class ReceiverCallback implements LBMReceiverCallback {
public int onReceive(Object cbArg, LBMMessage msg)
{
switch (msg.type())
{
case LBM.MSG_UME_REGISTRATION_SUCCESS_EX:
UMERegistrationSuccessInfo reg = msg.registrationSuccessInfo();
System.out.println("[" + msg.topicName() + "][" + msg.source() + "] store " + reg.storeIndex() + ": "
+ reg.store() + " UME registration successful. Sequence number is " + reg.sequenceNumber());
break;
case LBM.MSG_UME_REGISTRATION_COMPLETE_EX:
UMERegistrationCompleteInfo regcomplete = msg.registrationCompleteInfo();
System.out.println("[" + msg.topicName() + "][" + msg.source() + "] UME registration complete. SQN "
+ regcomplete.sequenceNumber() + ". Flags " + regcomplete.flags());
break;
default:
System.out.println("Other event, type=" + msg.type());
break;
}
return 0;
}
} /* ReceiverCallback */
private static class UMERcvRecInfo implements UMERecoverySequenceNumberCallback {
public int setRecoverySequenceNumberInfo(Object cbArg, UMERecoverySequenceNumberCallbackInfo cbInfo) {
long new_low = 100;
System.out.println("lowSequenceNumber["+cbInfo.lowSequenceNumber()+"] is the starting sequence number as determined by registration consensus.");
System.out.println("highSequenceNumber["+cbInfo.highSequenceNumber()+"] is the highest sequence number available in the persisted stores.");
System.out.println("lowRxReqMaxSequenceNumber["+cbInfo.lowRxReqMaxSequenceNumber()+"] is the lowest sequence number to be requested.");
try {
cbInfo.setLowSequenceNumber(new_low);
}
catch (LBMEInvalException e) {
System.err.println(e.getMessage());
}
System.out.flush();
return 0;
}
}
} /* class MinSrc */
|