Java 中的 ThreadFactory 用法 [英] ThreadFactory usage in Java

问题描述

有人可以简要解释一下如何以及何时使用 ThreadFactory 吗?使用和不使用 ThreadFactory 的示例可能真的有助于理解差异.

Can someone briefly explain on HOW and WHEN to use a ThreadFactory? An example with and without using ThreadFactory might be really helpful to understand the differences.

谢谢！

推荐答案

工厂模式是一种创建性设计模式，用于软件开发中，用于封装对象创建过程.

The factory pattern is a creational design pattern used in software development to encapsulate the processes involved in the creation of objects.

假设我们有一些工作线程用于不同的任务，并希望它们具有特殊的名称(例如用于调试目的).所以我们可以实现一个线程工厂:

Let's assume we have some worker threads for different tasks and want them with special names (say for debugging purposes). So we could implement a ThreadFactory:

public class WorkerThreadFactory implements ThreadFactory {
   private int counter = 0;
   private String prefix = "";

   public WorkerThreadFactory(String prefix) {
     this.prefix = prefix;
   }

   public Thread newThread(Runnable r) {
     return new Thread(r, prefix + "-" + counter++);
   }
}

如果您有这样的需求，如果没有工厂或构建器模式，就很难实现它.

If you had such a requirement, it would be pretty difficult to implement it without a factory or builder pattern.

ThreadFactory 是 Java API 的一部分，因为它也被其他类使用.所以上面的例子说明了为什么我们在某些情况下应该使用工厂来创建线程"，当然，绝对不需要实现 java.util.concurrent.ThreadFactory 来完成这个任务.

ThreadFactory is part of the Java API because it is used by other classes too. So the example above shows why we should use 'a factory to create Threads' in some occasions but, of course, there is absolutely no need to implement java.util.concurrent.ThreadFactory to accomplish this task.

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