1、創(chuàng)建線程或線程池時(shí)請(qǐng)指定有意義的線程名稱，方便出錯(cuò)時(shí)回溯。創(chuàng)建線程池的時(shí)候請(qǐng)使用帶ThreadFactory的構(gòu)造函數(shù)，并且提供自定義ThreadFactory實(shí)現(xiàn)或者使用第三方實(shí)現(xiàn)。

ThreadFactory namedThreadFactory = new ThreadFactoryBuilder().setNameFormat('demo-pool-%d').build();ExecutorService singleThreadPool = new ThreadPoolExecutor(1, 1,0L, TimeUnit.MILLISECONDS,new LinkedBlockingQueue<Runnable>(1024), namedThreadFactory, new ThreadPoolExecutor.AbortPolicy());singleThreadPool.execute(()-> System.out.println(Thread.currentThread().getName()));singleThreadPool.shutdown();public class TimerTaskThread extends Thread {public TimerTaskThread(){super.setName('TimerTaskThread'); …}

2、線程池不允許使用Executors去創(chuàng)建，而是通過(guò)ThreadPoolExecutor的方式，這樣的處理方式讓寫的同學(xué)更加明確線程池的運(yùn)行規(guī)則，規(guī)避資源耗盡的風(fēng)險(xiǎn)。

說(shuō)明：Executors返回的線程池對(duì)象的弊端如下：

1）FixedThreadPool和SingleThreadPool:  允許的請(qǐng)求隊(duì)列長(zhǎng)度為Integer.MAX_VALUE，可能會(huì)堆積大量的請(qǐng)求，從而導(dǎo)致OOM。

2）CachedThreadPool:  允許的創(chuàng)建線程數(shù)量為Integer.MAX_VALUE，可能會(huì)創(chuàng)建大量的線程，從而導(dǎo)致OOM。

Positive example 1：

//org.apache.commons.lang3.concurrent.BasicThreadFactoryScheduledExecutorService executorService = new ScheduledThreadPoolExecutor(1,new BasicThreadFactory.Builder().namingPattern('example-schedule-pool-%d').daemon(true).build());

Positive example 2：

ThreadFactory namedThreadFactory = new ThreadFactoryBuilder().setNameFormat('demo-pool-%d').build();//Common Thread PoolExecutorService pool = new ThreadPoolExecutor(5, 200,0L, TimeUnit.MILLISECONDS,new LinkedBlockingQueue<Runnable>(1024), namedThreadFactory, new ThreadPoolExecutor.AbortPolicy());pool.execute(()-> System.out.println(Thread.currentThread().getName()));pool.shutdown();//gracefully shutdown

Positive example 3：

<bean id='userThreadPool'class='org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor'><property name='corePoolSize' value='10' /><property name='maxPoolSize' value='100' /><property name='queueCapacity' value='2000' /><property name='threadFactory' value= threadFactory /><property name='rejectedExecutionHandler'><ref local='rejectedExecutionHandler' /></property></bean>//in codeuserThreadPool.execute(thread);

3、線程資源必須通過(guò)線程池提供，不允許在應(yīng)用中自行顯式創(chuàng)建線程。

說(shuō)明：

使用線程池的好處是減少在創(chuàng)建和銷毀線程上所花的時(shí)間以及系統(tǒng)資源的開銷，解決資源不足的問(wèn)題。

如果不使用線程池，有可能造成系統(tǒng)創(chuàng)建大量同類線程而導(dǎo)致消耗完內(nèi)存或者“過(guò)度切換”的問(wèn)題。

ThreadFactory namedThreadFactory = new ThreadFactoryBuilder().setNameFormat('demo-pool-%d').build();ExecutorService singleThreadPool = new ThreadPoolExecutor(1, 1,0L, TimeUnit.MILLISECONDS,new LinkedBlockingQueue<Runnable>(1024), namedThreadFactory, new ThreadPoolExecutor.AbortPolicy());singleThreadPool.execute(()-> System.out.println(Thread.currentThread().getName()));singleThreadPool.shutdown();

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