Spring 线程池使用

/** 

 * 

 */


一个日志管理的类:
在批理更新,插入,等操作

package com.xiu.order.core.orders.impl; 


import java.util.List; 


import org.springframework.core.task.TaskExecutor; 


import com.xiu.common.dao.persistence.exception.DAOException; 

import com.xiu.order.core.exception.ManagerException; 

import com.xiu.order.core.orders.LogManager; 

import com.xiu.order.dal.orders.dao.LogDAO; 

import com.xiu.order.dal.orders.dataobject.LogDO; 


public class LogManagerImpl implements LogManager { 


 private LogDAO operatorLogDAO; 


 public LogDAO getOperatorLogDAO() { 

 return operatorLogDAO; 

 } 


 public void setOperatorLogDAO(LogDAO operatorLogDAO) { 

 this.operatorLogDAO = operatorLogDAO; 

 } 


 private TaskExecutor taskExecutor; 


 public void setTaskExecutor(TaskExecutor taskExecutor) { 

 this.taskExecutor = taskExecutor; 

 } 


 @Override 

 public List<LogDO> queryOperatorLog(int orderId) throws ManagerException { 

 try { 

 return operatorLogDAO.queryOperatorLog(orderId); 

 } catch (DAOException e) { 

 throw new ManagerException(e); 

 } 

 } 


 @Override 

 public int insertOperatorLog(LogDO operationLogDO) throws ManagerException { 

 try { 

 return operatorLogDAO.insertOperatorLog(operationLogDO); 

 } catch (DAOException e) { 

 throw new ManagerException(e); 

 } 

 } 


 @Override 

 public List<LogDO> queryOperatorLogList(LogDO operationLogDO) 

 throws ManagerException { 

 try { 

 return operatorLogDAO.queryOperatorLogList(operationLogDO); 

 } catch (DAOException e) { 

 throw new ManagerException(e); 

 } 

 } 


 public void batchAddOptLogAsync(final List<LogDO> optLogDOList) 

 throws ManagerException { 

 taskExecutor.execute(new Runnable() { 

 public void run() { 

 try { 

 operatorLogDAO.batchAddOptLogAsync(optLogDOList); 

 } catch (DAOException e) { 

 // System.out.println(e); 

 } 

 } 

 }); 

 } 


 @Override 

 public void addOptLogAsync(final LogDO optLogDO) throws ManagerException { 

 taskExecutor.execute(new Runnable() { 

 public void run() { 

 try { 

 insertOperatorLog(optLogDO); 

 } catch (ManagerException e) { 

 e.printStackTrace(); 

 } 

 } 

 }); 

 } 


 @Override 

 public List<Integer> queryLogInfoByOrderIdListAndLogInfo( 

 List<Integer> orderIdList, LogDO oprationLogDO) 

 throws ManagerException { 

 try { 

 return operatorLogDAO.queryLogInfoByOrderIdListAndLogInfo( 

 orderIdList, oprationLogDO); 

 } catch (DAOException e) { 

 throw new ManagerException(e); 

 } 

 } 

}


spring 配置

<bean id="operatorLogManager" class="com.xiu.order.core.orders.impl.LogManagerImpl "> 

 <property name="taskExecutor" ref="taskExecutor"></property> 

 </bean> 


 <bean id="taskExecutor" 

 class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor"> 

 <property name="corePoolSize" value="10" /> 

 <property name="maxPoolSize" value="30" /> 

 </bean>




<转>
最近,由于项目里需要用到线程池来提高处理速度,记录一下spring的taskExecutor执行器来实现线程池。

这里省略了Service接口的定义和在applicationContext.xml文件中配置相应的bean(service)。

1、处理器实现类


Java代码

1.package com.shine.job; 

2. 

3.import java.util.List; 

4. 

5.import org.apache.commons.logging.Log; 

6.import org.apache.commons.logging.LogFactory; 

7.import org.springframework.core.task.TaskExecutor; 

8. 

9.import com.shine.service.Service; 

10. 

11./** 

12. * 处理器接口实现类 

13. */ 

14.public class ProcessorImpl implements Processor { 

15. 

16. // 日志对象 

17. private static Log logger = LogFactory.getLog(ProcessorImpl.class); 

18. 

19. // 执行器 

20. private TaskExecutor taskExecutor; 

21. 

22. // 业务接口 

23. private Service service; 

24. 

25. public void process() { 

26. // 使用多线程处理 

27. taskExecutor.execute(new Runnable(){ 

28. public void run() { 

29. try { 

30. logger.debug("[Thread " 

31. + Thread.currentThread().getId() 

32. + " start]"); 

33. // 业务处理 

34. service.handle(name); 

35. logger.debug("[Thread " 

36. + Thread.currentThread().getId() 

37. + " end]"); 

38. } catch (RuntimeException e) { 

39. logger.error("Service handle exception",e); 

40. } 

41. } 

42. }); 

43. } 

44. } 

45. 

46. public void setService(Service service) { 

47. this.service = service; 

48. } 

49. 

50. public void setTaskExecutor(TaskExecutor taskExecutor) { 

51. this.taskExecutor = taskExecutor; 

52. } 

53. 

54.}




2、applicationContext.xml配置


Xml代码

1.<!-- 线程池(执行器) --> 

2.<task:executor id="taskExecutor" pool-size="1-4" queue-capacity="128" /> 

3. 

4.<!-- 处理接口 --> 

5.<bean id="processor" class="com.shine.job.ProcessorImpl"> 

6. <property name="service" ref="service" /> 

7. <property name="taskExecutor"> 

8. <ref bean="taskExecutor" /> 

9. </property> 

10.</bean>




其中:
pool-size="1-4",表示线程池活跃的线程数为1,最大线程数为4;
queue-capacity="128",表示任务队列的最大容量。

PS:关于taskExecutor还有一种配置bean来实现的,其配置的写法和参数与上面基本一致。


ThreadPoolTaskExecutor的配置在网上找了很多解释没找到,看了下ThreadPoolExecutor的配置,名字差不多,应该含义也差不多。只不过ThreadPoolTaskExecutor对
ThreadPoolExecutor做了包装。

<bean id ="taskExecutor" class ="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor" > 

 <property name ="corePoolSize" value ="5" /> 

 <property name ="keepAliveSeconds" value ="300" /> 

 <property name ="maxPoolSize" value ="10" /> 

 <property name ="queueCapacity" value ="25" />


</bean> 线程的配置文件:

corePoolSize: 线程池维护线程的最少数量

keepAliveSeconds 线程池维护线程所允许的空闲时间

maxPoolSize 线程池维护线程的最大数量

queueCapacity 线程池所使用的缓冲队列

当一个任务通过execute(Runnable)方法欲添加到线程池时:

l 如果此时线程池中的数量小于corePoolSize,即使线程池中的线程都处于空闲状态,也要创建新的线程来处理被添加的任务。

l 如果此时线程池中的数量等于 corePoolSize,但是缓冲队列 workQueue未满,那么任务被放入缓冲队列。

l 如果此时线程池中的数量大于corePoolSize,缓冲队列workQueue满,并且线程池中的数量小于maximumPoolSize,建新的线程来处理被添加的任务。

l 如果此时线程池中的数量大于corePoolSize,缓冲队列workQueue满,并且线程池中的数量等于maximumPoolSize,那么通过 handler所指定的策略来处理此任务。也就是:处理任务的优先级为:核心线程corePoolSize、任务队列workQueue、最大线程 maximumPoolSize,如果三者都满了,使用handler处理被拒绝的任务。

l 当线程池中的线程数量大于 corePoolSize时,如果某线程空闲时间超过keepAliveTime,线程将被终止。这样,线程池可以动态的调整池中的线程数。