spring boot使用自定义配置的线程池执行Async异步任务

在前面的博客中，http://www.jb51.net/article/106718.htm 我们使用了spring boot的异步操作，当时，我们使用的是默认的线程池，但是，如果我们想根据项目来定制自己的线程池了，下面就来说说，如何定制线程池！

一、增加配置属性类

package com.chhliu.springboot.async.configuration;
import org.springframework.boot.context.properties.ConfigurationProperties; 

@ConfigurationProperties(prefix = "spring.task.pool") // 该注解的locations已经被启用，现在只要是在环境中，都会优先加载
public class TaskThreadPoolConfig {
 private int corePoolSize; 

 private int maxPoolSize; 

 private int keepAliveSeconds; 

 private int queueCapacity; 

 …………省略getter,setter方法…………
}

二、创建线程池

package com.chhliu.springboot.async.pool;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; 

import com.chhliu.springboot.async.configuration.TaskThreadPoolConfig; 

@Configuration
@EnableAsync
public class TaskExecutePool { 

 @Autowired
 private TaskThreadPoolConfig config; 

 @Bean
 public Executor myTaskAsyncPool() {
  ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
  executor.setCorePoolSize(config.getCorePoolSize());
  executor.setMaxPoolSize(config.getMaxPoolSize());
  executor.setQueueCapacity(config.getQueueCapacity());
  executor.setKeepAliveSeconds(config.getKeepAliveSeconds());
  executor.setThreadNamePrefix("MyExecutor-"); 

  // rejection-policy：当pool已经达到max size的时候，如何处理新任务
  // CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行
  executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
  executor.initialize();
  return executor;
 }
}

三、在主类中开启配置支持

package com.chhliu.springboot.async;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.scheduling.annotation.EnableAsync; 

import com.chhliu.springboot.async.configuration.TaskThreadPoolConfig; 

@SpringBootApplication
@EnableAsync
@EnableConfigurationProperties({TaskThreadPoolConfig.class} ) // 开启配置属性支持
public class SpringbootAsyncApplication { 

 public static void main(String[] args) {
  SpringApplication.run(SpringbootAsyncApplication.class, args);
 }
}

四、测试类

package com.chhliu.springboot.async.pool; 

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component; 

@Component
public class AsyncTask {
 protected final Logger logger = LoggerFactory.getLogger(this.getClass()); 

 @Async("myTaskAsyncPool") //myTaskAsynPool即配置线程池的方法名，此处如果不写自定义线程池的方法名，会使用默认的线程池
 public void doTask1(int i) throws InterruptedException{
  logger.info("Task"+i+" started.");
 }
}

五、测试

package com.chhliu.springboot.async;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner; 

import com.chhliu.springboot.async.pool.AsyncTask; 

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootAsyncApplicationTests {
 protected final Logger logger = LoggerFactory.getLogger(this.getClass());
 @Autowired
 private AsyncTask asyncTask; 

 @Test
 public void AsyncTaskTest() throws InterruptedException, ExecutionException { 

  for (int i = 0; i < 100; i++) {
   asyncTask.doTask1(i);
  } 

  logger.info("All tasks finished.");
 }
}

测试结果如下：

2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-10] c.c.springboot.async.pool.AsyncTask  : Task60 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-25] c.c.springboot.async.pool.AsyncTask  : Task61 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-6] c.c.springboot.async.pool.AsyncTask  : Task62 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-23] c.c.springboot.async.pool.AsyncTask  : Task63 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-20] c.c.springboot.async.pool.AsyncTask  : Task64 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-19] c.c.springboot.async.pool.AsyncTask  : Task65 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-16] c.c.springboot.async.pool.AsyncTask  : Task66 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-15] c.c.springboot.async.pool.AsyncTask  : Task67 started.
2017-03-20 20:15:15.208 INFO 4068 --- [ MyExecutor-12] c.c.springboot.async.pool.AsyncTask  : Task68 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-1] c.c.springboot.async.pool.AsyncTask  : Task69 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-11] c.c.springboot.async.pool.AsyncTask  : Task81 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-8] c.c.springboot.async.pool.AsyncTask  : Task82 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-7] c.c.springboot.async.pool.AsyncTask  : Task83 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-4] c.c.springboot.async.pool.AsyncTask  : Task84 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-29] c.c.springboot.async.pool.AsyncTask  : Task85 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-21] c.c.springboot.async.pool.AsyncTask  : Task86 started.
2017-03-20 20:15:15.209 INFO 4068 --- [ MyExecutor-17] c.c.springboot.async.pool.AsyncTask  : Task88 started. 

测试结果ok！

六、配置默认的线程池

如果我们想使用默认的线程池，但是只是想修改默认线程池的配置，那怎么做了，此时我们需要实现AsyncConfigurer类，示例代码如下：

import java.lang.reflect.Method;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import com.chhliu.cq.emailservice.threadconfiguration.TaskThreadPoolConfig;
import lombok.extern.slf4j.Slf4j; 

/**
 * 注意：该线程池被所有的异步任务共享，而不属于某一个异步任务
 * 描述：配置异步任务的线程池
 * @author chhliu
 * 创建时间：2017年5月22日 上午10:20:56
 * @version 1.2.0
 */
@Slf4j
@Configuration
public class AsyncTaskExecutePool implements AsyncConfigurer{ 

 @Autowired
 private TaskThreadPoolConfig config; // 配置属性类，见上面的代码 

 @Override
 public Executor getAsyncExecutor() {
  ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
  executor.setCorePoolSize(config.getCorePoolSize());
  executor.setMaxPoolSize(config.getMaxPoolSize());
  executor.setQueueCapacity(config.getQueueCapacity());
  executor.setKeepAliveSeconds(config.getKeepAliveSeconds());
  executor.setThreadNamePrefix("taskExecutor-"); 

  // rejection-policy：当pool已经达到max size的时候，如何处理新任务
  // CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行
  executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
  executor.initialize();
  return executor;
 } 

 @Override
 public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {// 异步任务中异常处理
  return new AsyncUncaughtExceptionHandler() { 

   @Override
   public void handleUncaughtException(Throwable arg0, Method arg1, Object... arg2) {
    log.error("=========================="+arg0.getMessage()+"=======================", arg0);
    log.error("exception method:"+arg1.getName());
   }
  };
 }
} 

使用的时候，只需在方法上加上@Async即可。

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