java - Spring 批处理 : Execution order for multiple JobExecutionListener instances for a single job

Question

给定一个 Spring Batch 作业，该作业配置了一系列 JobExecutionListener 实例，每个监听器的执行顺序是什么。示例:

<job id="myJob" xmlns="http://www.springframework.org/schema/batch">

        <batch:listeners>
            <batch:listener ref="myJobExecutionListener1" />
            <batch:listener ref="myJobExecutionListener2" />
            <batch:listener ref="myJobExecutionListener3" />
            <batch:listener ref="myJobExecutionListener4" />                
        </batch:listeners>

       <!-- job config continues -->
</job>

在上面的例子中，保证监听器是按照配置的顺序执行还是按照随机的顺序执行。我尝试查看 Spring Batch 引用文档，但就我的研究而言，我找不到此文档。

Answer 1

监听器将按照其声明顺序执行。在您的示例中，将按以下顺序调用它们:

myJobExecutionListener1.beforeJob
myJobExecutionListener2.beforeJob
myJobExecutionListener3.beforeJob
myJobExecutionListener4.beforeJob

// .. job output

myJobExecutionListener4.afterJob
myJobExecutionListener3.afterJob
myJobExecutionListener2.afterJob
myJobExecutionListener1.afterJob