/** This is the heart of the event manager, which processes the events for a robot. */
public void processEvents() {
// Remove old events
eventQueue.clear(getTime() - MAX_EVENT_STACK);
// Process custom events
for (Condition customEvent : customEvents) {
boolean conditionSatisfied = callUserCode(customEvent);
if (conditionSatisfied) {
addImpl(new CustomEvent(customEvent));
}
}
// Sort the events based on the time and priority of the events
eventQueue.sort();
// Process event queue here
Event currentEvent;
while ((currentEvent = (eventQueue.size() > 0) ? eventQueue.get(0) : null) != null
&& currentEvent.getPriority() >= currentTopEventPriority) {
if (currentEvent.getPriority() == currentTopEventPriority) {
if (currentTopEventPriority > Integer.MIN_VALUE
&& isInterruptible(currentTopEventPriority)) {
setInterruptible(currentTopEventPriority, false); // we're going to restart it, so reset.
// We are already in an event handler, took action, and a new event was generated.
// So we want to break out of the old handler to process it here.
throw new EventInterruptedException(currentEvent.getPriority());
}
break;
}
int oldTopEventPriority = currentTopEventPriority;
currentTopEventPriority = currentEvent.getPriority();
currentTopEvent = currentEvent;
eventQueue.remove(currentEvent);
try {
dispatch(currentEvent);
setInterruptible(currentTopEventPriority, false);
} catch (EventInterruptedException e) {
currentTopEvent = null;
} catch (RuntimeException e) {
currentTopEvent = null;
throw e;
} catch (Error e) {
currentTopEvent = null;
throw e;
} finally {
currentTopEventPriority = oldTopEventPriority;
}
}
}
@Override
public int compareTo(Event e) {
if (priority > e.getPriority()) {
return -1;
} else if (priority < e.getPriority()) {
return 1;
} else {
return 0;
}
}
/**
* Returns the priority of events belonging to a specific class.
*
* @param eventClass is a string with the full class name of the event type to get the priority
* from.
* @return the event priority of the specified event class.
* @see robocode.Event#getPriority()
*/
public int getEventPriority(String eventClass) {
if (eventClass == null) {
return -1;
}
final Event event = eventNames.get(eventClass);
if (event == null) {
return -1;
}
return event.getPriority();
}
public static void main(String[] args) {
PriorityBlockingQueue<Event> queue = new PriorityBlockingQueue<Event>();
Thread[] taskThreads = new Thread[5];
// 初始这 5 个任务线程。
for (int i = 0; i < taskThreads.length; i++) {
Task task = new Task(i, queue);
taskThreads[i] = new Thread(task);
}
// 启动这 5 个任务线程。
for (Thread t : taskThreads) {
t.start();
}
// 使用 join() 方法，让 main 线程等待 5 个任务线程结束。
for (Thread t : taskThreads) {
try {
t.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.printf("Main: Queue Size: %d\n", queue.size());
for (int i = 0; i < taskThreads.length * 1000; i++) {
Event event = queue.poll();
System.out.printf("Thread %s: Priority %d\n", event.getThread(), event.getPriority());
}
System.out.printf("Main: Queue Size: %d\n", queue.size());
System.out.printf("Main: End of the program\n");
}