线程池 - TaskDecorator线程的装饰（跨线程传递ThreadLocal的方案）

最新推荐文章于 2025-09-11 02:29:26 发布

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最新推荐文章于 2025-09-11 02:29:26 发布 · 2.6k 阅读

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#java #开发语言

本文详细解析了SpringThreadPoolTaskExecutor如何使用TaskDecorator装饰线程，以及在实际项目中如何配置，重点展示了如何在装饰器中访问主线程的ThreadLocal变量。

ThreadPoolTaskExecutor在执行线程时，存在一个TaskDecorator配置，可以装饰线程类。

1. 源码分析

源码：org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor#initializeExecutor

@Override protected ExecutorService initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) {

    BlockingQueue < Runnable > queue = createQueue(this.queueCapacity);
    
    ThreadPoolExecutor executor;
    //配置了线程装饰器
    if (this.taskDecorator != null) {
        executor = new ThreadPoolExecutor(this.corePoolSize, this.maxPoolSize, this.keepAliveSeconds, TimeUnit.SECONDS, queue, threadFactory, rejectedExecutionHandler) {@Override public void execute(Runnable command) {
                //装饰线程类
                Runnable decorated = taskDecorator.decorate(command);
                if (decorated != command) {
                    decoratedTaskMap.put(decorated, command);
                }