Spring Batch 3.0.2 使用注释的并行步骤

Question

我正在使用 SpringBatch 3.0.2 并尝试创建一个作业，该作业使用带有注释的 JavaConfig 样式和 JobBuilderFactory 类来执行一系列步骤（其中一些是并行的）。我想要发生的是从 step1 开始，当它完成时过渡到 step2a、step2b、step2c 和 step2d，它们都并行运行。当所有这些步骤完成后，它应该过渡到第 3 步。我正在为创建此工作所需的语法而苦苦挣扎

@Bean(name = "SplitFlowJob4")
 public Job splitFlowJob4() throws SQLException
  {
    final Flow flow2b = new FlowBuilder<Flow>("subflow2b").from(step2b()).end();
    final Flow flow2c = new FlowBuilder<Flow>("subflow2c").from(step2c()).end();
    final Flow flow2d = new FlowBuilder<Flow>("subflow2d").from(step2d()).end();

    return jobs.get("SplitFlowJob4").start(step1()).next(step2a()).split(new SimpleAsyncTaskExecutor())
        .add(flow2b, flow2c, flow2d).next(step3()).end().build();
  }

这不符合我的预期。这仅执行 step1 和 step2a。我没有看到 step2b、2c、2d 或 step3。

    [INFO ] [main] 2015-02-09 15:28:32,169 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep1]
    [INFO ] [main] 2015-02-09 15:28:32,194 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep2a]

如果我更改语法并从 step1 调用 split，那么 step1、2a、2b、2c、2d 将全部并行执行，而不仅仅是步骤 2a、2b、2c、2d。

  @Bean(name = "SplitFlowJob5")
  public Job splitFlowJob5() throws SQLException
  {
    final Flow flow2a = new FlowBuilder<Flow>("subflow2a").from(step2a()).end();
    final Flow flow2b = new FlowBuilder<Flow>("subflow2b").from(step2b()).end();
    final Flow flow2c = new FlowBuilder<Flow>("subflow2c").from(step2c()).end();
    final Flow flow2d = new FlowBuilder<Flow>("subflow2d").from(step2d()).end();

    return jobs.get("SplitFlowJob5").start(step1()).split(new SimpleAsyncTaskExecutor())
        .add(flow2a, flow2b, flow2c, flow2d).next(step3()).end().build();
  }

这会并行执行 Step1、step2a、step2b、step2c、step2d。

    [INFO ] [SimpleAsyncTaskExecutor-2] 2015-02-09 16:28:36,507 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep2b]
    [INFO ] [SimpleAsyncTaskExecutor-5] 2015-02-09 16:28:36,513 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep1]
    [INFO ] [SimpleAsyncTaskExecutor-3] 2015-02-09 16:28:36,512 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep2c]
    [INFO ] [SimpleAsyncTaskExecutor-4] 2015-02-09 16:28:36,509 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep2d]
    [INFO ] [SimpleAsyncTaskExecutor-1] 2015-02-09 16:28:36,507 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep2a]
    [INFO ] [main] 2015-02-09 16:28:36,615 org.springframework.batch.core.job.SimpleStepHandler - Executing step: [SplitFlowJobStep3]

我不确定我做错了什么，是否可以使用 fluent builder api 创建这样的工作？我见过其他以拆分开头或结尾的工作示例，但我还没有看到在工作中间包含拆分的示例。

Answer 1

Spring Batch 的 java 配置中存在一个带有拆分的错误，该错误已在上周晚些时候修复 (BATCH-2346)。那里的修复解决了阻止执行列表中的第一个流程的错误以及有关如何解决这个用例的文档修复。

简而言之，以下代码应该适用于最新代码：

@Bean(name = "SplitFlowJob5")
public Job splitFlowJob5() throws SQLException
{
    final Flow flow2a = new FlowBuilder<Flow>("subflow2a").from(step2a()).end();
    final Flow flow2b = new FlowBuilder<Flow>("subflow2b").from(step2b()).end();
    final Flow flow2c = new FlowBuilder<Flow>("subflow2c").from(step2c()).end();
    final Flow flow2d = new FlowBuilder<Flow>("subflow2d").from(step2d()).end();

    final Flow splitFlow = new FlowBuilder<Flow>("splitFlow")
        .start(flow2a)
        .split(new SimpleAsyncTaskExecutor())
        .add(flow2b, flow2c, flow2d).build();

    return jobs.get("SplitFlowJob5").start(step1())
       .next(splitFlow).next(step3()).end().build();
}