/**
* Periodically ping (that is send a CONNECT_MEDIATOR packet) the BackEnd to detect when the
* device is reachable again. When the BackEnd receives a CONNECT_MEDIATOR packet it resets the
* input connection --> If blocked waiting for incoming commands, the InputManager thread should
* get an IOException.
*/
public void run() {
int attemptCnt = 0;
long startTime = System.currentTimeMillis();
try {
while (!ping(attemptCnt)) {
attemptCnt++;
if ((System.currentTimeMillis() - startTime) > maxDisconnectionTime) {
throw new ICPException("Max disconnection timeout expired");
} else {
waitABit(retryTime);
}
}
// Ping succeeded
myLogger.log(Logger.INFO, "Reconnection ping OK.");
synchronized (this) {
pingOK = true;
setReachable();
myKeepAliveManager.update();
// Activate postponed commands flushing
waitingForFlush = myStub.flush();
}
} catch (ICPException icpe) {
// Impossible to reconnect to the BackEnd
myLogger.log(
Logger.SEVERE,
"Impossible to reconnect to the BackEnd (" + System.currentTimeMillis() + ")",
icpe);
if (myConnectionListener != null) {
myConnectionListener.handleConnectionEvent(ConnectionListener.RECONNECTION_FAILURE, null);
}
}
}
private synchronized void update() {
if (kaTimeout > 0) {
TimerDispatcher td = TimerDispatcher.getTimerDispatcher();
if (kaTimer != null) {
td.remove(kaTimer);
}
kaTimer = td.add(new Timer(System.currentTimeMillis() + kaTimeout, this));
}
}
/**
* Set the reachability state as "unreachable" and starts a separate thread that periodically
* ping the back-end to detect when we are reachable again
*/
private synchronized void setUnreachable(boolean missingKA) {
if (reachable) {
if (missingKA || !pingOK) {
if (myConnectionListener != null) {
myConnectionListener.handleConnectionEvent(ConnectionListener.DISCONNECTED, null);
}
reachable = false;
myLogger.log(Logger.INFO, "Starting DM (" + System.currentTimeMillis() + ").");
myThread = new Thread(this);
myThread.start();
if (pingOK) {
// The InputManager is blocked waiting for data that will never arrive
// Kill it and create a new one
myInputManager.kill();
myInputManager = new InputManager();
myInputManager.start();
}
}
}
}