ThreadFactory
An object that creates new threads on demand. Using thread factories removes hardwiring of calls tonew Thread
, enabling applications to use special thread subclasses, priorities, etc.
The simplest implementation of this interface is just:
- class SimpleThreadFactory implements ThreadFactory {
- public Thread newThread(Runnable r) {
- return new Thread(r);
- }
- }
The
Executors.defaultThreadFactory
method provides a more useful simple implementation, that sets the created thread context to known values before returning it. - /**
- * The default thread factory
- */
- static class DefaultThreadFactory implements ThreadFactory {
- static final AtomicInteger poolNumber = new AtomicInteger(1);
- final ThreadGroup group;
- final AtomicInteger threadNumber = new AtomicInteger(1);
- final String namePrefix;
- DefaultThreadFactory() {
- SecurityManager s = System.getSecurityManager();
- group = (s != null)? s.getThreadGroup() :
- Thread.currentThread().getThreadGroup();
- namePrefix = "pool-" +
- poolNumber.getAndIncrement() +
- "-thread-";
- }
- public Thread newThread(Runnable r) {
- Thread t = new Thread(group, r,
- namePrefix + threadNumber.getAndIncrement(),
- 0);
- if (t.isDaemon())
- t.setDaemon(false);
- if (t.getPriority() != Thread.NORM_PRIORITY)
- t.setPriority(Thread.NORM_PRIORITY);
- return t;
- }
- }
下面写一简单示例。
- package com.test;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import java.util.concurrent.ThreadFactory;
- class Task implements Runnable{
- int taskId;
- public Task(int taskId) {
- this.taskId=taskId;
- }
- @Override
- public void run() {
- System.out.println(Thread.currentThread().getName()+"--taskId: "+taskId);
- }
- }
- class DaemonThreadFactory implements ThreadFactory {
- @Override
- public Thread newThread(Runnable r) {
- Thread t=new Thread(r);
- t.setDaemon(true);
- return t;
- }
- }
- public class ThreadFactoryTest {
- public static void main(String[] args) {
- ExecutorService exec=Executors.newFixedThreadPool(3,new DaemonThreadFactory());
- for(int i=0;i<3;i++) {
- exec.submit(new Task(i));
- }
- exec.shutdown();
- }
- }
输出如下:
Thread-1--taskId: 1
Thread-2--taskId: 2
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2015-11-16 android100 自定义内容提供者