private void readNextValue() {
try {
curValue = res.take();
} catch (InterruptedException interEx) {
Thread.currentThread().interrupt();
}
}
/**
* After starting this class (start()), this method MAY be called to block the thread that created
* the instance of this class. Otherwise, the thread will finish and the instance of this class
* will be terminated.
*
* @throws InterruptedException unsuccessful join
*/
public void join() throws InterruptedException {
// TODO:
// initiate a graceful termination procedure (i.e., close()).
log.info("joining");
@SuppressWarnings("unused")
Object object = dispatcherJoin.take();
}
@Override
public void run() {
assertSame(this, Thread.currentThread());
try {
while (true) {
Request request = requestQueue.take();
Object result;
try {
result = invokeMethod(request.methodName, request.arguments);
} catch (ThreadDeath death) {
return;
} catch (InvocationTargetException exception) {
responseQueue.put(new Response(request.methodName, null, exception.getTargetException()));
continue;
} catch (Throwable throwable) {
responseQueue.put(new Response(request.methodName, null, throwable));
continue;
}
responseQueue.put(new Response(request.methodName, result, null));
}
} catch (ThreadDeath death) {
return;
} catch (InterruptedException ignored) {
// SynchronousQueue sometimes throws InterruptedException while the threads are stopping.
} catch (Throwable uncaught) {
this.uncaughtThrowable = uncaught;
}
}
/**
* Obtain a queue message synchronously.
*
* @param queueName Name of the queue from where to retrieve a message
* @param timeout Timeout, in milliseconds. When timeout is reached a TimeoutException is thrown.
* Zero means that the client wants to wait forever. A negative value means that the client
* doesn't want to wait if there are no messages is local agent's queue.
* @param reserveTime Message reserve time, in milliseconds. Polled messages are reserved, by
* default, for 15 minutes. If clients prefer a different reserve time , bigger or small, they
* can specify it.
* @param acceptRequest An AcceptRequest object used handling Accept messages.
* @return A notification containing the queue message. Or null if timeout was a negative value
* and there was no message in local agent's queue.
*/
public NetNotification poll(
String queueName, long timeout, long reserveTime, AcceptRequest acceptRequest)
throws Throwable {
if (StringUtils.isBlank(queueName))
throw new IllegalArgumentException("Mal-formed Poll request. queueName is blank.");
NetPoll poll = new NetPoll(queueName, timeout);
NetAction action = new NetAction(ActionType.POLL);
action.setPollMessage(poll);
NetMessage message = buildMessage(action);
SynchronousQueue<NetMessage> synQueue = new SynchronousQueue<NetMessage>();
synchronized (_syncSubscriptions) {
if (_syncSubscriptions.containsKey(queueName))
throw new IllegalArgumentException("Queue " + queueName + " has already a poll runnig.");
_syncSubscriptions.put(queueName, message);
pendingPolls.put(queueName, synQueue);
}
if (reserveTime > 0) {
message.getHeaders().put(Headers.RESERVE_TIME, reserveTime + "");
}
if (acceptRequest != null) {
poll.setActionId(acceptRequest.getActionId());
PendingAcceptRequestsManager.addAcceptRequest(acceptRequest);
}
getNetHandler().sendMessage(message);
NetMessage receivedMsg = synQueue.take();
synchronized (_syncSubscriptions) {
_syncSubscriptions.remove(queueName);
pendingPolls.remove(queueName);
}
if (receivedMsg == BrokerProtocolHandler.TimeoutUnblockNotification)
throw new TimeoutException();
if (receivedMsg == BrokerProtocolHandler.NoMessageUnblockNotification) return null;
NetNotification m = null;
if (receivedMsg.getAction().getActionType().equals(ActionType.NOTIFICATION)) {
m = receivedMsg.getAction().getNotificationMessage();
} else {
log.error(
"Poll unbloqued by a message that wasn't of any of the expeceted error nor a notification.");
return null;
}
return m;
}
// Causes the caller thread to block until an object is placed in the sync queue/
// If an Exception is place in the queue, it this thrown by the calling thread.
private void join() throws Exception {
while (true) {
Object result = null;
try {
result = queue.take();
if (result instanceof Exception) {
throw (Exception) result;
}
break;
} catch (InterruptedException e) {
if (result != null) throw e;
}
}
}
public void run() {
for (Course course : Course.values()) {
Food food = course.randomSelection();
try {
waitPerson.placeOrder(this, food);
// Blocks until course has been delivered:
print(this + "eating " + placeSetting.take());
} catch (InterruptedException e) {
print(this + "waiting for " + course + " interrupted");
break;
}
}
print(this + "finished meal, leaving");
}
public void waitForUiThread(Handler icHandler) {
if (DEBUG) {
ThreadUtils.assertOnThread(icHandler.getLooper().getThread(), AssertBehavior.THROW);
Log.d(
LOGTAG,
"waitForUiThread() blocking on thread " + icHandler.getLooper().getThread().getName());
}
try {
Runnable runnable = null;
do {
runnable = mIcRunnableSync.take();
runnable.run();
} while (runnable != mIcSignalRunnable);
} catch (InterruptedException e) {
}
}
@Override
public Task awaitTask() throws InterruptedException {
sem.release();
return queue.take();
}
