Spring Batch @BeforeContext无法执行 [英] Spring Batch @BeforeContext Fails to Execute

问题描述

在春季批处理中，我有多个组成复合物料处理器的物料处理器.我需要在同一步骤中在两个处理器之间共享一些上下文数据.我找到了一个访问上下文的可行解决方案，如下所示.那就是说，有一个替代解决方案似乎更干净一些，但是它使用了@BeforeStepAnnotation，它从未被调用.如果可能的话，我想使用第二种解决方案.非常感谢您提供有关如何执行此操作的建议.

I have a situation in spring batch where I have multiple item processors that make up a composite item processor. I need to share some context data between two processors in the same step. I have found a working solution to access the context, shown below. That said there is an alternate solution that appears to be a bit cleaner but it uses the @BeforeStepAnnotation, which never gets called. I would like to use the second solution if possible. Any advice on how to do this is much appreciated.

这有效:

@Component
@StepScope
public class MyItemProcessor implements ItemProcessor<String,String> {

   @Value(#{stepExecution});
   private StepExecution stepExecution;


   public String process(String s){
     //Do things

     Context context = new Context();
     context.set("Hello Context");

     ExecutionContext executionContext = stepExecution.getExecutionContext();
     executionContext.put("Context", context);

   }

}

此操作失败:

@Component
@StepScope
public class MyItemProcessor implements ItemProcessor<String,String> {

   private ExecutionContext executionContext;

   public String process(String s){
      //Do things
      Context context = new Context();
      context.set("Hello Context");

      executionContext.put("Context", context);
   } 


   @BeforeStep
   public getCurrentContext(StepExecution stepExecution){
         executionContext = stepExecution.getExecutionContext();
   } 

}

推荐答案

由于项目处理器是复合处理器的一部分，因此对于@BeforeStep注释，它不会自检，因此不会注册为侦听器. Spring Batch将仅检查已注册为处理器的对象(在您的情况下为复合对象)，而不是整个对象图.

Since your item processor is part of a composite, it is not introspected for @BeforeStep annotation and hence it is not registered as a listener. Spring Batch will only introspect the object that is registered as a processor (the composite in your case) and not the entire object graph.

您需要将所有组成处理器注册为侦听器，才能正常工作.以下链接可能会有所帮助:

You need to register any composing processor as a listener for this to work. The following links might help:

• Spring-batch @BeforeStep不适用于@StepScope
• https://github.com/spring-projects/spring-batch/issues/1428#issuecomment-566277832

• Spring-batch @BeforeStep does not work with @StepScope
• https://github.com/spring-projects/spring-batch/issues/1428#issuecomment-566277832

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