public void run() {
try {
isStarting = true;
synchronized (this) {
serverSocket = new ServerSocket(0);
this.port = serverSocket.getLocalPort();
setRunning(true);
isStarting = false;
this.notifyAll();
}
System.err.println("Child-process heartbeat server started on port: " + port);
while (true) {
Socket sock = serverSocket.accept();
log("Got heartbeat connection from client; starting heartbeat.");
synchronized (heartBeatThreads) {
HeartbeatThread hbt = new HeartbeatThread(sock);
heartBeatThreads.add(hbt);
hbt.start();
}
}
} catch (Exception e) {
if (!running) log("Heartbeat server was shutdown.");
else log("Got expcetion in heartbeat server: " + e.getMessage());
} finally {
setRunning(false);
log("Heartbeat server terminated.");
}
}
public synchronized boolean isAnyAppServerAlive() {
boolean foundAlive = false;
synchronized (heartBeatThreads) {
for (Iterator it = heartBeatThreads.iterator(); it.hasNext(); ) {
HeartbeatThread hb = (HeartbeatThread) it.next();
boolean aliveStatus = hb.isAppServerAlive();
log("pinging: " + hb.port + ", alive? = " + aliveStatus);
foundAlive = foundAlive || aliveStatus;
}
}
return foundAlive;
}
/**
* Stops the channel.
*
* @param svc int
* @throws ChannelException Stop error
* @see org.apache.catalina.tribes.Channel#stop(int)
*/
@Override
public synchronized void stop(int svc) throws ChannelException {
if (hbthread != null) {
hbthread.stopHeartbeat();
hbthread = null;
}
super.stop(svc);
}
private synchronized void shutdown() {
setRunning(false);
if (serverSocket != null) {
try {
serverSocket.close(); // this effectively interrupts the thread and force it to exit
} catch (IOException e) {
throw new RuntimeException(e);
}
}
synchronized (heartBeatThreads) {
HeartbeatThread ht;
for (Iterator i = heartBeatThreads.iterator(); i.hasNext(); ) {
ht = (HeartbeatThread) i.next();
ht.sendKillSignal();
}
}
}
/**
* Starts the channel.
*
* @param svc int - what service to start
* @throws ChannelException Start error
* @see org.apache.catalina.tribes.Channel#start(int)
*/
@Override
public synchronized void start(int svc) throws ChannelException {
setupDefaultStack();
if (optionCheck) checkOptionFlags();
super.start(svc);
if (hbthread == null && heartbeat) {
hbthread = new HeartbeatThread(this, heartbeatSleeptime);
hbthread.start();
}
}
