private void stopConnectionMonitoring() {
if (connectionMonitoringThread != null) {
while (true) {
try {
connectionMonitoringThread.interrupt();
connectionMonitoringThread.join();
break;
} catch (InterruptedException ex) {
// ouch - let's try again!
}
}
}
}
private void startConnectionMonitoring() {
connectionMonitoringThread =
new Thread() {
@Override
public void run() {
LOGGER.debug("monitoring thread started");
while (true) {
try {
// heart beat of 30s (should be configurable in the future)
Thread.sleep(30000);
// disconnect() was called.
if (wantDisconnect) this.interrupt();
if (lastPingSent != lastPingAck || websocketSession == null) {
// disconnection happened
LOGGER.warn("Connection lost...");
try {
if (websocketSession != null) {
websocketSession.close();
}
} catch (IOException e) {
LOGGER.error("exception while trying to close the websocket ", e);
}
websocketSession = null;
if (reconnectOnDisconnection) {
connectImpl();
continue;
} else {
this.interrupt();
}
} else {
lastPingSent = getNextMessageId();
LOGGER.debug("sending ping " + lastPingSent);
try {
if (websocketSession.isOpen()) {
websocketSession
.getBasicRemote()
.sendText("{\"type\":\"ping\",\"id\":" + lastPingSent + "}");
} else if (reconnectOnDisconnection) {
connectImpl();
}
} catch (IllegalStateException e) {
// websocketSession might be closed in this case
if (reconnectOnDisconnection) {
connectImpl();
}
}
}
} catch (InterruptedException e) {
break;
} catch (IOException e) {
LOGGER.error("unexpected exception on monitoring thread ", e);
}
}
LOGGER.debug("monitoring thread stopped");
}
};
if (!wantDisconnect) connectionMonitoringThread.start();
}