在特殊情况下,我尝试将Spring上下文复制到Runnable / Callable任务。我希望其他线程能够像以前一样运行。
我已经读过这个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;
}
}
我打算如下使用该执行器:
@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,contextExecutor总是被调用(在任何线程中!)。 我该如何解决?
答案 0 :(得分:0)
此帖子:
How to create additional TaskExecutor beside TaskExecutionAutoConfiguration?
描述问题。仅当用户未创建自定义启动器时,Springboot才会创建默认的执行器。 在SpringBoot 2+中,您必须使用
@AutoConfigureAfter(TaskExecutionAutoConfiguration.class)
在您的自定义配置上。
但是,在以前的Spring版本中,不存在TaskExecutionAutoConfiguration,并且工厂执行者是创建的。使用下面的几行,您可以创建由Spring创建的默认执行程序的样例副本。
@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();
}