springBatch多线程设置

本文介绍springBatch 多线程两种配置方式:

本文原创，转载请标明出处，谢谢

1、第一种方式如下配置方式，reader、processor、writer都是多线程处理，处理线程数为10.但是今天我测试发现设置的线程数为n，通常只有n-1个线程在跑，
猜测少的那个线程可能是作为备用线程或者是任务调度线程。

<batch:job id="Job">
   <batch:step id="Step">
      <batch:tasklet transaction-manager="transactionManager" task-executor="taskExecutor">
         <batch:chunk reader="itemReader" writer="itemWriter" processor="itemProcessor"
            commit-interval="1" />
         <batch:listeners>
            <batch:listener ref="customStepListener" />
            <batch:listener ref="customItemReaderListener" />
            <batch:listener ref="customItemWriterListener" />
         batch:listeners>
      batch:tasklet>
   batch:step>
batch:job>

<bean id="taskExecutor"
     class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
   <property name="corePoolSize" value="10" />
   <property name="maxPoolSize" value="30" />
bean>

2、第二种方式如下：可以指定read 或者 writer processor 为多线程处理

<batch:job id="Job">
   <batch:step id="Step">
      <batch:tasklet transaction-manager="transactionManager" >
         <batch:chunk reader="itemReader" writer="itemWriter" processor="itemProcessor"
            commit-interval="1" />
         <batch:listeners>
            <batch:listener ref="customStepListener" />
            <batch:listener ref="customItemReaderListener" />
            <batch:listener ref="customItemWriterListener" />
         batch:listeners>
      batch:tasklet>
   batch:step>
batch:job>
<bean id="taskExecutor"
     class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
   <property name="corePoolSize" value="10" />
   <property name="maxPoolSize" value="30" />
bean>

java：

public class ItemProcessor implements ItemProcessor {
   private TaskExecutor taskExecutor;
   public void setTaskExecutor(TaskExecutor taskExecutor) {
      this.taskExecutor = taskExecutor;
   }
   public String process(final String item) throws Exception {
      taskExecutor.execute(new Runnable() {
         public void run() {
            try {
               Thread current = Thread.currentThread();
               System.out.println("@process: "+"  "+current.getId());
               System.out.println("@getName: "+current.getName());
               System.out.println("@activeCount: "+current.activeCount());
               System.out.println("@getId: "+current.getId());
               System.out.println("@toString: "+current.toString());
            } catch (Exception e) {
               System.out.println(e);
            }
         }
      });
      return item;
   }
}