Example #1
0
  /**
   * Creates and starts the {@link #sendKeepAliveMessageThread} which is to send STUN keep-alive
   * <tt>Message</tt>s to the STUN server associated with the <tt>StunCandidateHarvester</tt> of
   * this instance in order to keep the <tt>Candidate</tt>s harvested by this instance alive.
   */
  private void createSendKeepAliveMessageThread() {
    synchronized (sendKeepAliveMessageSyncRoot) {
      Thread t = new SendKeepAliveMessageThread(this);
      t.setDaemon(true);
      t.setName(getClass().getName() + ".sendKeepAliveMessageThread: " + hostCandidate);

      boolean started = false;

      sendKeepAliveMessageThread = t;
      try {
        t.start();
        started = true;
      } finally {
        if (!started && (sendKeepAliveMessageThread == t)) sendKeepAliveMessageThread = null;
      }
    }
  }
Example #2
0
  /**
   * Runs in {@link #sendKeepAliveMessageThread} to notify this instance that
   * <tt>sendKeepAliveMessageThread</tt> is about to exit.
   */
  private void exitSendKeepAliveMessageThread() {
    synchronized (sendKeepAliveMessageSyncRoot) {
      if (sendKeepAliveMessageThread == Thread.currentThread()) sendKeepAliveMessageThread = null;

      /*
       * Well, if the currentThread is finishing and this instance is
       * still to send keep-alive messages, we'd better start another
       * Thread for the purpose to continue the work that the
       * currentThread was supposed to carry out.
       */
      if ((sendKeepAliveMessageThread == null)
          && (sendKeepAliveMessageInterval != SEND_KEEP_ALIVE_MESSAGE_INTERVAL_NOT_SPECIFIED)) {
        createSendKeepAliveMessageThread();
      }
    }
  }
Example #3
0
  /**
   * Runs in {@link #sendKeepAliveMessageThread} and sends STUN keep-alive <tt>Message</tt>s to the
   * STUN server associated with the <tt>StunCandidateHarvester</tt> of this instance.
   *
   * @return <tt>true</tt> if the method is to be invoked again; otherwise, <tt>false</tt>
   */
  private boolean runInSendKeepAliveMessageThread() {
    synchronized (sendKeepAliveMessageSyncRoot) {
      // Since we're going to #wait, make sure we're not canceled yet.
      if (sendKeepAliveMessageThread != Thread.currentThread()) return false;
      if (sendKeepAliveMessageInterval == SEND_KEEP_ALIVE_MESSAGE_INTERVAL_NOT_SPECIFIED) {
        return false;
      }

      // Determine the amount of milliseconds that we'll have to #wait.
      long timeout;

      if (sendKeepAliveMessageTime == -1) {
        /*
         * If we're just starting, don't just go and send a new STUN
         * keep-alive message but rather wait for the whole interval.
         */
        timeout = sendKeepAliveMessageInterval;
      } else {
        timeout =
            sendKeepAliveMessageTime + sendKeepAliveMessageInterval - System.currentTimeMillis();
      }
      // At long last, #wait if necessary.
      if (timeout > 0) {
        try {
          sendKeepAliveMessageSyncRoot.wait(timeout);
        } catch (InterruptedException iex) {
        }
        /*
         * Apart from being the time to send the STUN keep-alive
         * message, it could be that we've experienced a spurious
         * wake-up or that we've been canceled.
         */
        return true;
      }
    }

    sendKeepAliveMessageTime = System.currentTimeMillis();
    try {
      sendKeepAliveMessage();
    } catch (StunException sex) {
      logger.log(Level.INFO, "Failed to send STUN keep-alive message.", sex);
    }
    return true;
  }