Class Worker

platform/java/example/Worker.java:28–85

import java.util.concurrent.LinkedBlockingQueue;

public class Worker implements Runnable
{
	public static class Task implements Runnable {
		public void work() {} /* The 'work' method will be executed on the background thread. */
		public void run() {} /* The 'run' method will be executed on the UI thread if work() did not throw any exception. */
		public void exception(final Throwable t) {} /* The 'exception' method will be executed on the UI thread if work() throws an exception. */
	}

	protected EventQueue eventQueue;
	protected LinkedBlockingQueue<Task> queue;
	protected boolean alive;
	protected Thread thread;

	public Worker(EventQueue eventQueue) {
		this.eventQueue = eventQueue;
		queue = new LinkedBlockingQueue<Task>();
		thread = new Thread(this);
	}

	public void start() {
		alive = true;
		thread.start();
	}

	public void stop() {
		alive = false;
		thread.interrupt();
	}

	public void add(Task task) {
		try {
			queue.put(task);
		} catch (InterruptedException x) {
			return;
		}
	}

	public void run() {
		while (alive) {
			final Task task;
			try {
				task = queue.take();
			} catch (InterruptedException x) {
				break;
			}
			try {
				task.work();
				eventQueue.invokeLater(task);
			} catch (final Throwable t) {
				eventQueue.invokeLater(new Runnable() {
					public void run() {
						task.exception(t);
					}
				});
			}
		}
	}
}