假设我有一个利用Executor框架的应用程序
Executors.newSingleThreadExecutor().submit(new Runnable(){
@Override
public void run(){
// do stuff
}
}
当我在调试器中运行此应用程序时，将创建一个具有以下(默认)名称的线程:thread [pool-1-thread-1]。正如您所看到的，这并不是非常有用，而且据我所知，Executor框架并没有提供一种简单的方法来命名创建的线程或线程池。
那么，如何为线程/线程池提供名称呢?例如，Thread[fopool - foothread]。
当前回答
你可以提供一个ThreadFactory给newSingleThreadScheduledExecutor(ThreadFactory)。工厂将负责创建线程，并能够为它们命名。
引用Javadoc的话:
Creating new threads New threads are created using a ThreadFactory. If not otherwise specified, a Executors.defaultThreadFactory() is used, that creates threads to all be in the same ThreadGroup and with the same NORM_PRIORITY priority and non-daemon status. By supplying a different ThreadFactory, you can alter the thread's name, thread group, priority, daemon status, etc. If a ThreadFactory fails to create a thread when asked by returning null from newThread, the executor will continue, but might not be able to execute any tasks
其他回答
apache common -lang中的BasicThreadFactory在提供命名行为方面也很有用。您可以使用Builder根据需要命名线程，而不是编写匿名的内部类。下面是来自javadocs的例子:
// Create a factory that produces daemon threads with a naming pattern and
// a priority
BasicThreadFactory factory = new BasicThreadFactory.Builder()
.namingPattern("workerthread-%d")
.daemon(true)
.priority(Thread.MAX_PRIORITY)
.build();
// Create an executor service for single-threaded execution
ExecutorService exec = Executors.newSingleThreadExecutor(factory);
如果使用Spring，可以为CustomizableThreadFactory设置线程名前缀。
例子:
ExecutorService alphaExecutor =
Executors.newFixedThreadPool(10, new CustomizableThreadFactory("alpha-"));
或者，您可以使用ThreadPoolExecutorFactoryBean将ExecutorService创建为Spring bean——然后所有线程都将以beanName-前缀命名。
@Bean
public ThreadPoolExecutorFactoryBean myExecutor() {
ThreadPoolExecutorFactoryBean executorFactoryBean = new ThreadPoolExecutorFactoryBean();
// configuration of your choice
return executorFactoryBean;
}
在上面的例子中，线程将以myExecutor-前缀命名。您可以显式地将前缀设置为不同的值(例如。通过在工厂bean上设置executorFactoryBean.setThreadNamePrefix("myPool-")来实现。
Executors.newSingleThreadExecutor(r -> new Thread(r, "someName")).submit(getJob());
Runnable getJob() {
return () -> {
// your job
};
}
这是我的定制工厂，为线程转储分析器提供定制名称。通常我只是给tf=null来重用JVM默认的线程工厂。本网站有比较先进的螺纹工厂。
public class SimpleThreadFactory implements ThreadFactory {
private ThreadFactory tf;
private String nameSuffix;
public SimpleThreadFactory (ThreadFactory tf, String nameSuffix) {
this.tf = tf!=null ? tf : Executors.defaultThreadFactory();
this.nameSuffix = nameSuffix;
}
@Override public Thread newThread(Runnable task) {
// default "pool-1-thread-1" to "pool-1-thread-1-myapp-MagicTask"
Thread thread=tf.newThread(task);
thread.setName(thread.getName()+"-"+nameSuffix);
return thread;
}
}
- - - - -
ExecutorService es = Executors.newFixedThreadPool(4, new SimpleThreadFactory(null, "myapp-MagicTask") );
为了方便起见，这是一个用于调试的线程转储循环。
ThreadMXBean mxBean=ManagementFactory.getThreadMXBean();
long[] tids = mxBean.getAllThreadIds();
System.out.println("------------");
System.out.println("ThreadCount="+tids.length);
for(long tid : tids) {
ThreadInfo mxInfo=mxBean.getThreadInfo(tid);
if (mxInfo==null) {
System.out.printf("%d %s\n", tid, "Thread not found");
} else {
System.out.printf("%d %s, state=%s, suspended=%d, lockowner=%d %s\n"
, mxInfo.getThreadId(), mxInfo.getThreadName()
, mxInfo.getThreadState().toString()
, mxInfo.isSuspended()?1:0
, mxInfo.getLockOwnerId(), mxInfo.getLockOwnerName()
);
}
}
根据上面的一些注释，不同之处在于我只使用了lambda
Executors.newFixedThreadPool(10, r -> new Thread(r, "my-threads-%d"))
