java - 如何在 spring-batch 中拆分和加入流程以配置作业中的设置和拆卸步骤

Question

我已经查看了Spring-batch flow / split after a step ，并发现 (a) 标记的解决方案未解析，因为拆分无法到达，并且 (b) 我的用例不同，因此答案的意图不同。

我还查看了How to configure mentioned use case using spring batch parallel step split flow? ，但解决方案是增加并行化，而不是拆分和加入线程。

这似乎是一个足够常见的用例，它应该是一个常见问题解答，但我还没有看到解决方案。

我有一个并行化的 spring-batch 作业，我想在其中添加设置和拆卸步骤。设置和拆解是单线程的，但主体工作是并行的。

随着时间的推移以不同的方式绘制:

start        setup
               |
split       -------
            |     |
         some    other
         stuff   stuff
            |     |
join        -------
               |
finish      teardown

我开始的 spring-batch 作业 XML 是:

<batch:job id="myJob">

    <batch:step id="step0001-setup">
        <batch:tasklet transaction-manager="jtaTransactionManager"
            start-limit="100" allow-start-if-complete="true">
            <batch:chunk reader="beforeJobScriptExecutor" writer="dummySinkWriter"
                commit-interval="1" />
        </batch:tasklet>
    </batch:step>


    <batch:split id="split1" task-executor="taskExecutor" next="step9999">

        <batch:flow>
            <batch:step id="step0003-one-thread"
                allow-start-if-complete="true">
                <batch:tasklet transaction-manager="jtaTransactionManager"
                    start-limit="100">
                    <batch:chunk reader="myReader1" writer="myWriter1"
                        commit-interval="1" />
                </batch:tasklet>
            </batch:step>
        </batch:flow>

        <batch:flow>
            <batch:step id="step0002-another-thread">
                <batch:tasklet transaction-manager="jtaTransactionManager"
                    start-limit="100">
                    <batch:chunk reader="myReader2" writer="myWriter2"
                        commit-interval="1" />
                </batch:tasklet>
            </batch:step>
        </batch:flow>

    </batch:split>


    <batch:step id="step9999">
        <batch:tasklet transaction-manager="jtaTransactionManager"
            start-limit="100" allow-start-if-complete="true">
            <batch:chunk reader="afterJobScriptExecutor" writer="dummySinkWriter"
                commit-interval="1" />
        </batch:tasklet>
    </batch:step>
</batch:job>

Answer 1

解决方案主要在这篇文章中概述:How to terminate Step within a Spring Batch Split Flow with a Decider

spring-batch 作业的最终文本是这样的:

<batch:job id="myJob">

    <batch:step id="step0001-setup">
        <batch:tasklet transaction-manager="jtaTransactionManager"
            start-limit="100" allow-start-if-complete="true">
            <batch:chunk reader="beforeJobScriptExecutor" writer="dummySinkWriter"
                commit-interval="1" />
        </batch:tasklet>
        <batch:end on="FAILED" />
        <batch:next on="*" to="split1" />
    </batch:step>


    <batch:split id="split1" task-executor="taskExecutor" next="step9999">

        <batch:flow>
            <batch:step id="step0003-one-thread"
                allow-start-if-complete="true">
                <batch:tasklet transaction-manager="jtaTransactionManager"
                    start-limit="100">
                    <batch:chunk reader="myReader1" writer="myWriter1"
                        commit-interval="1" />
                </batch:tasklet>
            </batch:step>
        </batch:flow>

        <batch:flow>
            <batch:step id="step0002-another-thread">
                <batch:tasklet transaction-manager="jtaTransactionManager"
                    start-limit="100">
                    <batch:chunk reader="myReader2" writer="myWriter2"
                        commit-interval="1" />
                </batch:tasklet>
            </batch:step>
        </batch:flow>

    </batch:split>


    <batch:step id="step9999">
        <batch:tasklet transaction-manager="jtaTransactionManager"
            start-limit="100" allow-start-if-complete="true">
            <batch:chunk reader="afterJobScriptExecutor" writer="dummySinkWriter"
                commit-interval="1" />
        </batch:tasklet>
    </batch:step>
</batch:job>