[JAVA學習筆記-97]ActiveObject模式的Scheduler的關鍵實現

public class CustomScheduler implements Runnable {
			private LinkedBlockingQueue activationQueue = new LinkedBlockingQueue();
			@Override
			public void run() {
				dispatch();
		}
	
		public Future enqueue(Callable methodRequest) {
			final FutureTask task = new FutureTask(methodRequest) {
			public void run() {
				try {
					super.run(); 【調用FutureTask的run，實際調用的是callable的run】
					// 捕獲所有可能拋出的對象，避免該任務運行失敗而導致其所在的線程終止
				} catch (Throwable t) {
					this.setException(t);
				}
			}
		};
	
		try {
			activationQueue.put(task);
		} catch (InterruptedException e) {
			Thread.currentThread().interrupt();
		}
		return task;
	}

	public void dispatch() {
		while (true) {
			Runnable methodRequest;
			try {
				methodRequest = activationQueue.take();
				// 防止個別任務執行失敗導致線程終止的代碼在run方法中
				methodRequest.run();
			} catch (InterruptedException e) {
				// 處理該異常
				e.printStackTrace();
			}
		}
	}
}