Examples of com.sun.messaging.jmq.jmsserver.util.LockFile

com.sun.messaging.jmq.jmsserver.util.LockFile

This class encapsulates a broker lock file. The lock file makes sure that no two brokers using the same instance name are running at the same time (using different port numbers). The algorithm goes like this: Try to create a lock file in $JMQ_VARHOME/instances/lock If lock didn't exist previously and was created then we got the lock write :hostname:port\n to lock file and return. Else if lock file already exists read it. If contents of lock file match the instancename, hostname and port of this broker then the lock file was left over from a previous run of this broker and we assume we got the lock and return. Else try to connect to the broker on host:port to see if it is still up. If we connect to broker then we failed to get lock. return. Else assume the lock file is cruft. Remove it and try to acquire again.

            synchronized(lock) {
                if (audit == null) {
                    MQAuditService.init();
                    try {
                      audit = MQAuditService.getAuditSession();
                      LockFile lf = LockFile.getCurrentLockFile();
                    if (lf != null) {
                      audit.setInstance(lf.getInstance(),lf.getHost(), lf.getPort());
            }
                    } catch (BrokerException ex) {
                      getLogger().logStack(Logger.ERROR, ex.toString(), ex);
                        Broker.getBroker().exit(BrokerExitCode.ERROR, ex.toString(), BrokerEvent.Type.EXCEPTION);
                    }


        this.port = port;


        addService(SERVICE_NAME, "tcp", "PORTMAPPER", port, portmapperMap);


        LockFile lf = LockFile.getCurrentLockFile();


      try {
          if (lf != null) {
              lf.updatePort(port);
          }
        } catch (IOException e) {
          logger.log(Logger.WARNING, rb.E_LOCKFILE_BADUPDATE, e);
        }

        }


        this.hostname = hostname;
        this.mqaddress =  mqaddr;


  LockFile lf = LockFile.getCurrentLockFile();


  try {
      if (lf != null) {
          lf.updateHostname(mqaddress.getHostName());
      }
        } catch (IOException e) {
      logger.log(Logger.WARNING, rb.E_LOCKFILE_BADUPDATE, e);
        }

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