Spring 始终调用自定义 ThreadPoolTaskExecutor

Question

我正在尝试将 Spring 上下文复制到 Runnable/Callable 任务以用于特殊情况。我希望其他线程运行和之前运行一样。

我读过这个How to enable request scope in async task executor

并实现了自定义 ThreadPoolTaskExecutor + 装饰器。

@Configuration
public class ContextCopyConfig {

    private Integer connectionsLimit=10;

    @Bean(name = "contextExecutor")
    public Executor contextExecutor() {
        ThreadPoolTaskExecutor poolExecutor = new ThreadPoolTaskExecutor();
        poolExecutor.setTaskDecorator(new ContextCopyingDecorator());
        poolExecutor.setMaxPoolSize(connectionsLimit);
        poolExecutor.setCorePoolSize(connectionsLimit);

        poolExecutor.initialize();
        return poolExecutor;
    }

}

我打算按如下方式使用这个执行器：

@Autowired
@Qualifier(value = "contextExecutor")
private Executor contextExecutor;

public void parallelHere() throws IOException, InterruptedException, ExecutionException {
    Collection<Callable<Pair<String, OutputStream>>> tasks = new ArrayList<>(); //some tasks

    //ExecutorService executor = Executors.newFixedThreadPool(connectionsLimit); 

    List<Future<Pair<String, OutputStream>>> results = ((ThreadPoolTaskExecutor) contextExecutor).getThreadPoolExecutor().invokeAll(tasks);
    ((ThreadPoolTaskExecutor) contextExecutor).getThreadPoolExecutor().shutdown(); //always reclaim resources
}

但是，始终会调用 contextExecutor（在任何线程中！）。我该如何解决？

Answer 1

这个post:

描述了问题。 Spring仅当用户未创建自定义执行器时，boot 才会创建默认执行器。在 SpringBoot 2+ 中你必须使用

@AutoConfigureAfter(TaskExecutionAutoConfiguration.class)

在您的自定义配置上。

然而，在以前的 Spring 版本中，不存在 TaskExecutionAutoConfiguration 并且 Executor 是由工厂创建的。使用下面的行，您可以创建默认执行程序的执行副本，由 Spring.

创建

@Primary
@Bean
//see package org.springframework.aop.interceptor.AsyncExecutionInterceptor
public Executor getDefaultExecutor(){
    //     Executor defaultExecutor = super.getDefaultExecutor(beanFactory);
    //     return (defaultExecutor != null ? defaultExecutor : new SimpleAsyncTaskExecutor());
    return new SimpleAsyncTaskExecutor();
}

Spring 始终调用自定义 ThreadPoolTaskExecutor

Spring custom ThreadPoolTaskExecutor is always invoked

java

spring

spring-boot

java.util.concurrent

Spring 始终调用自定义 ThreadPoolTask​​Executor

Spring custom ThreadPoolTaskExecutor is always invoked

java

spring

spring-boot

java.util.concurrent

Spring 始终调用自定义 ThreadPoolTaskExecutor