无法使Spring Batch条件流正常工作 [英] Can't get spring batch conditional flows working

问题描述

我在使用java config使有条件的Spring批处理流工作时遇到了问题。我在Spring Batch示例、Spring Batch的测试代码或堆栈溢出中看到的示例倾向于显示一个条件，其中单个步骤需要有条件地执行，或者是最后一步，或者两者兼而有之。那不是我需要解决的情况。

在过程性伪代码中，我希望它的行为类似

initStep()
if decision1()
    subflow1()
middleStep()
if decision2()
    subflow2()
lastStep()

因此，subflow1和2是有条件的，但是init、mediate和last始终执行。这是我的精简测试用例。在当前配置中，执行subflow1后就退出了。

public class FlowJobTest {

private JobBuilderFactory jobBuilderFactory;
private JobRepository jobRepository;
private JobExecution execution;

@BeforeMethod
public void setUp() throws Exception {
    jobRepository = new MapJobRepositoryFactoryBean().getObject();
    jobBuilderFactory = new JobBuilderFactory(jobRepository);
    execution = jobRepository.createJobExecution("flow", new JobParameters());
}

@Test
public void figureOutFlowJobs() throws Exception {

    JobExecutionDecider subflow1Decider = decider(true);
    JobExecutionDecider subflow2Decider = decider(false);

    Flow subflow1 = new FlowBuilder<Flow>("subflow-1").start(echo("subflow-1-Step-1")).next(echo("subflow-1-Step-2")).end();
    Flow subflow2 = new FlowBuilder<Flow>("subflow-2").start(echo("subflow-2-Step-1")).next(echo("subflow-2-Step-2")).end();

    Job job = jobBuilderFactory.get("testJob")
            .start(echo("init"))

            .next(subflow1Decider)
                .on("YES").to(subflow1)
            .from(subflow1Decider)
                .on("*").to(echo("middle"))
            .next(subflow2Decider)
                .on("YES").to(subflow2)
            .from(subflow2Decider)
                .on("*").to(echo("last"))

            .next(echo("last"))
            .build().preventRestart().build();

    job.execute(execution);
    assertEquals(execution.getStatus(), BatchStatus.COMPLETED);
    assertEquals(execution.getStepExecutions().size(), 5);
}


private Step echo(String stepName) {
    return new AbstractStep() {
        {
            setName(stepName);
            setJobRepository(jobRepository);
        }
        @Override
        protected void doExecute(StepExecution stepExecution) throws Exception {
            System.out.println("step: " + stepName);
            stepExecution.upgradeStatus(BatchStatus.COMPLETED);
            stepExecution.setExitStatus(ExitStatus.COMPLETED);
            jobRepository.update(stepExecution);
        }
    };
}

private JobExecutionDecider decider(boolean decision) {
    return (jobExecution, stepExecution) -> new FlowExecutionStatus(decision ? "YES" : "NO");
}

}

推荐答案

您的原始作业定义也应该可以工作，只需稍作调整。测试失败，因为作业在第一个子流之后完成(状态为已完成)。如果您指示它继续执行中间步骤，它应该会按预期工作。对第二个流进行类似的调整。

Job job = jobBuilderFactory.get("testJob")
        .start(echo("init"))

        .next(subflow1Decider)
            .on("YES").to(subflow1).next(echo("middle"))
        .from(subflow1Decider)
            .on("*").to(echo("middle"))
        .next(subflow2Decider)
            .on("YES").to(subflow2).next(echo("last"))
        .from(subflow2Decider)
            .on("*").to(echo("last"))

        .build().preventRestart().build();

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