ThreadFactory, ExecutorService的简单使用
Executors中：
<span style="white-space:pre"> </span>/** * Creates a thread pool that creates new threads as needed, but * will reuse previously constructed threads when they are * available, and uses the provided * ThreadFactory to create new threads when needed. * @param threadFactory the factory to use when creating new threads * @return the newly created thread pool * @throws NullPointerException if threadFactory is null */
public static ExecutorService newCachedThreadPool(ThreadFactory threadFactory) {
return new ThreadPoolExecutor(0, Integer.MAX_VALUE,
60L, TimeUnit.SECONDS,
new SynchronousQueue<Runnable>(),
threadFactory);
}//根据一个线程工厂创建一个线程缓冲池，线程池中的线程都由该线程工厂创建
实例：
import java.util.concurrent.ThreadFactory;
public class DaemonThreadFactory implements ThreadFactory {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setDaemon(true);
return t;
}
}
</pre><pre name="code" class="java">import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class DaemonFromFactory implements Runnable {
@Override
public void run() {
try{
while(true){
TimeUnit.MILLISECONDS.sleep(100);
System.out.println(Thread.currentThread()+" "+this);
}
}catch(Exception e){
System.out.println("Interrupted");
}
}
public static void main(String[] args) throws Exception {
long start = System.currentTimeMillis();
ExecutorService exec = Executors.newCachedThreadPool(new DaemonThreadFactory());
for(int i=0;i<10;i++)
exec.execute(new DaemonFromFactory());
System.out.println("All daemons started");
TimeUnit.MILLISECONDS.sleep(500);
System.out.println("time="+(System.currentTimeMillis()-start));
}
}
输出：
All daemons started Thread[Thread-6,5,main] thread.DaemonFromFactory@6fb104b6 Thread[Thread-5,5,main] thread.DaemonFromFactory@60469460 Thread[Thread-7,5,main] thread.DaemonFromFactory@1467bfc6 Thread[Thread-4,5,main] thread.DaemonFromFactory@8df59a3 Thread[Thread-3,5,main] thread.DaemonFromFactory@6fbe8b4c Thread[Thread-2,5,main] thread.DaemonFromFactory@196406c7 Thread[Thread-1,5,main] thread.DaemonFromFactory@3c907261 Thread[Thread-0,5,main] thread.DaemonFromFactory@7b3fb7f0 Thread[Thread-9,5,main] thread.DaemonFromFactory@692e1ca8 Thread[Thread-8,5,main] thread.DaemonFromFactory@48df2951 Thread[Thread-6,5,main] thread.DaemonFromFactory@6fb104b6 Thread[Thread-4,5,main] thread.DaemonFromFactory@8df59a3 Thread[Thread-5,5,main] thread.DaemonFromFactory@60469460 Thread[Thread-7,5,main] thread.DaemonFromFactory@1467bfc6 Thread[Thread-3,5,main] thread.DaemonFromFactory@6fbe8b4c Thread[Thread-2,5,main] thread.DaemonFromFactory@196406c7 Thread[Thread-8,5,main] thread.DaemonFromFactory@48df2951 Thread[Thread-9,5,main] thread.DaemonFromFactory@692e1ca8 Thread[Thread-0,5,main] thread.DaemonFromFactory@7b3fb7f0 Thread[Thread-1,5,main] thread.DaemonFromFactory@3c907261 Thread[Thread-2,5,main] thread.DaemonFromFactory@196406c7 Thread[Thread-3,5,main] thread.DaemonFromFactory@6fbe8b4c Thread[Thread-7,5,main] thread.DaemonFromFactory@1467bfc6 Thread[Thread-5,5,main] thread.DaemonFromFactory@60469460 Thread[Thread-6,5,main] thread.DaemonFromFactory@6fb104b6 Thread[Thread-1,5,main] thread.DaemonFromFactory@3c907261 Thread[Thread-4,5,main] thread.DaemonFromFactory@8df59a3 Thread[Thread-0,5,main] thread.DaemonFromFactory@7b3fb7f0 Thread[Thread-9,5,main] thread.DaemonFromFactory@692e1ca8 Thread[Thread-8,5,main] thread.DaemonFromFactory@48df2951 Thread[Thread-2,5,main] thread.DaemonFromFactory@196406c7 Thread[Thread-3,5,main] thread.DaemonFromFactory@6fbe8b4c Thread[Thread-6,5,main] thread.DaemonFromFactory@6fb104b6 Thread[Thread-7,5,main] thread.DaemonFromFactory@1467bfc6 Thread[Thread-5,5,main] thread.DaemonFromFactory@60469460 Thread[Thread-8,5,main] thread.DaemonFromFactory@48df2951 Thread[Thread-9,5,main] thread.DaemonFromFactory@692e1ca8 Thread[Thread-0,5,main] thread.DaemonFromFactory@7b3fb7f0 Thread[Thread-1,5,main] thread.DaemonFromFactory@3c907261 Thread[Thread-4,5,main] thread.DaemonFromFactory@8df59a3 time=507
可看出0-9的线程只被创建了一次