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
一个快速而肮脏的方法是使用Thread.currentThread().setName(myName);在run()方法中。
其他回答
您可以编写自己的ThreadFactory实现，例如使用一些现有的实现(如defaultThreadFactory)，并在最后更改名称。
实现ThreadFactory的例子:
class ThreadFactoryWithCustomName implements ThreadFactory {
private final ThreadFactory threadFactory;
private final String name;
public ThreadFactoryWithCustomName(final ThreadFactory threadFactory, final String name) {
this.threadFactory = threadFactory;
this.name = name;
}
@Override
public Thread newThread(final Runnable r) {
final Thread thread = threadFactory.newThread(r);
thread.setName(name);
return thread;
}
}
和用法:
Executors.newSingleThreadExecutor(new ThreadFactoryWithCustomName(
Executors.defaultThreadFactory(),
"customName")
);
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()
);
}
}
使用Executors.defaultThreadFactory()的现有功能，但只设置名称:
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
public class NamingThreadFactory implements ThreadFactory {
private final String prefix;
private final AtomicInteger threadNumber = new AtomicInteger(0);
public NamingThreadFactory(String prefix){
this.prefix = prefix;
}
@Override
public Thread newThread(Runnable r) {
Thread t = Executors.defaultThreadFactory().newThread(r);
t.setName(prefix + threadNumber.addAndGet(1));
return t;
}
}
我用来装饰现有工厂的自制核心Java解决方案:
public class ThreadFactoryNameDecorator implements ThreadFactory {
private final ThreadFactory defaultThreadFactory;
private final String suffix;
public ThreadFactoryNameDecorator(String suffix) {
this(Executors.defaultThreadFactory(), suffix);
}
public ThreadFactoryNameDecorator(ThreadFactory threadFactory, String suffix) {
this.defaultThreadFactory = threadFactory;
this.suffix = suffix;
}
@Override
public Thread newThread(Runnable task) {
Thread thread = defaultThreadFactory.newThread(task);
thread.setName(thread.getName() + "-" + suffix);
return thread;
}
}
在行动:
Executors.newSingleThreadExecutor(new ThreadFactoryNameDecorator("foo"));
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"))
