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spring boot使用自定义配置的线程池执行Async异步任务

2019年07月19日  | 移动技术网IT编程  | 我要评论

在前面的博客中， 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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