jetty thread pool两种实现方式

1.自带的pool

QueuedThreadPool pool = new QueuedThreadPool();		
			pool.setMinThreads(Integer.parseInt(PropertiesUtil.getValue("api_threadpool_min_size")));
			pool.setMaxThreads(Integer.parseInt(PropertiesUtil.getValue("api_threadpool_max_size")));
			pool.setMaxIdleTimeMs(200);


			SelectChannelConnector connection0 = new SelectChannelConnector();

			connection0.setPort(Integer.parseInt(PropertiesUtil.getValue("jetty.port")));
			
			connection0.setMaxIdleTime(10000);

			server.setThreadPool(pool);

 小技巧：

这里可以设置只接受的线程数，如果超过，那么等待的线程立刻回复busy

if (pool.getThreads() >= pool.getMaxThreads()) {
			WritePrint(response, "<?xml version=\"1.0\"?><Request><ErrorCode>2</ErrorCode><ResponseMsg>System is busy</ResponseMsg></Request>");
			logger.info("Return response:<?xml version=\"1.0\"?><Request><ErrorCode>2</ErrorCode><ResponseMsg>System is busy</ResponseMsg></Request>");
			return;			
		}

public void WritePrint(HttpServletResponse response, String outWriter) {
		try {
			PrintWriter out = response.getWriter();
			out.println(outWriter);
			out.flush();
			out.close();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
	}

  

注意：jetty主线程占一条，最后等于max thread的线程会rejected,所以实际执行的线程数是（设置的MAX线程-2）

2.第三方pool

先建立pool类

public class ThreadPool {

	private static Logger logger = LoggerFactory.getLogger(IrapiServer.class);
	
	
	private ThreadPool() {}

	private static ThreadPoolExecutor pool;
	
	public static void initThreadPool(ThreadPoolExecutor pool){
		ThreadPool.pool = pool;
	}
	
	public static ThreadPoolExecutor createThreadPool() {
		int corePoolsize = Integer.valueOf(PropertiesUtil.getValue("api_threadpool_min_size"));
		int maximumPoolSize = Integer.valueOf(PropertiesUtil.getValue("api_threadpool_max_size"));
		BlockingQueue<Runnable> queue = new LinkedBlockingQueue<Runnable>();
		logger.info("create thread pool: corePoolsize=" + corePoolsize
				+ ", maximumPoolSize=" + maximumPoolSize);
		ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
				corePoolsize, maximumPoolSize, 1, TimeUnit.SECONDS, queue,
				new ThreadPoolExecutor.CallerRunsPolicy());
		return threadPoolExecutor;
	}
	
	public static ThreadPoolExecutor getThreadPool(){
		return ThreadPool.pool;
	}
}

然后在主方法中调用：

ThreadPool.initThreadPool(ThreadPool.createThreadPool());

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最后，service类要继承线程类，然后执行：

ThreadPool.getThreadPool().execute(irapiServiceHandler);

这样设置等待线程的线程立刻rejected：

if ((ThreadPool.getThreadPool().getTaskCount() - ThreadPool.getThreadPool().getCompletedTaskCount()) >=  maximumPoolSize) {
			WritePrint(response, "<?xml version=\"1.0\"?><Request><ErrorCode>2</ErrorCode><ResponseMsg>System is busy</ResponseMsg></Request>");
			logger.info("Return response:<?xml version=\"1.0\"?><Request><ErrorCode>2</ErrorCode><ResponseMsg>System is busy</ResponseMsg></Request>");
			return;
		}