Spring @Async 限制线程数
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Spring @Async limit number of threads
提问by Martin V.
My question is very similar to this one : @Async prevent a thread to continue until other thread have finished
我的问题与这个问题非常相似：@Async 阻止一个线程继续，直到其他线程完成
Basically i need run ~ hundreds of computations in more threads. I want to run only some amount of parallel threads e.g. 5 threads with 5 computationis in paralell.
基本上我需要在更多线程中运行~数百次计算。我只想运行一些并行线程，例如 5 个并行计算的 5 个线程。
I am using spring framework and @Async option is natural choice. I do not need full-featured JMS queue, that`s a bit overhead for me.
我正在使用 spring 框架，@Async 选项是自然的选择。我不需要全功能的 JMS 队列，这对我来说有点开销。
Any ideas ? Thank you
有任何想法吗 ？谢谢
采纳答案by jelies
Have you checked out Task Executor? You can define a Thread Pool, with a maximum number of threads to execute your tasks.
你退房了Task Executor吗？你可以定义一个线程池，用最大数量的线程来执行你的任务。
If you want to use it with @Async, use this in your spring-config:
如果要与 一起@Async使用，请在 spring-config 中使用它：
<task:annotation-driven executor="myExecutor" scheduler="myScheduler"/>
<task:executor id="myExecutor" pool-size="5"/>
<task:scheduler id="myScheduler" pool-size="10"/>
Full reference here(25.5.3). Hope this helps.
完整参考这里(25.5.3)。希望这可以帮助。
回答by Siggen
If you are using Spring's Java-configuration, your config class needs to implements AsyncConfigurer:
如果您使用的是 Spring 的 Java 配置，则您的配置类需要实现AsyncConfigurer：
@Configuration
@EnableAsync
public class AppConfig implements AsyncConfigurer {
[...]
@Override
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(2);
executor.setMaxPoolSize(5);
executor.setQueueCapacity(50);
executor.setThreadNamePrefix("MyExecutor-");
executor.initialize();
return executor;
}
}
See @EnableAsyncdocumentation for more details : http://docs.spring.io/spring/docs/3.1.x/javadoc-api/org/springframework/scheduling/annotation/EnableAsync.html
有关@EnableAsync更多详细信息，请参阅文档：http: //docs.spring.io/spring/docs/3.1.x/javadoc-api/org/springframework/scheduling/annotation/EnableAsync.html
回答by RenRen
Since spring boot 2.1you can use auto configuration and change the maximum number of threads in the application properties file
从 spring boot 2.1 开始，您可以使用自动配置并更改应用程序属性文件中的最大线程数
spring.task.execution.pool.max-size=4
See the full documentation:
https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-task-execution-scheduling
查看完整文档：https:
//docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-task-execution-scheduling
