Spring 批处理：使用超类作为编写器步骤

Question

我有一个 spring 批处理应用程序，它有两个单独的作业。 它们使用两种不同的读取器，但处理器和写入器实际上是相同的。 writer 的唯一区别是它们每个都应该有一个名为 jobName 的属性，该属性为每个 writer 保存不同的值。 为了实现这一点，我尝试使用 writer 超类。 有没有办法实现这个？ 如何调用配置 class 中的作者？ class 对于作者来说应该是什么样的签名？ 由于两个编写器子类的 write() 方法完全相同，它们应该在超类还是子类中实现？

工作 1

public class JobConfig1{
  // ...

  @Bean
  public Step jobStep(SynchronizedItemStreamReader<InputObj1> someReader1,
      ItemWriter someWriter1) {
    return stepBuilderFactory
    .get("writeAdvantageStep")
    .chunk(writeChunkSize)
    .reader(someReader1)
    .writer(someWriter1) //value of this writer is equal to someWriter1()
    .processor(new SomeProcessor())
    .faultTolerant()
    .build();
  }

  // reader step ...
 
  // processor step ...

  // writer step
  // somehow class one of the writer classes (I'll call it SomeWriter1)
}

工作 2

public class JobConfig2{
  // ...

  @Bean
  public Step jobStep(SynchronizedItemStreamReader<InputObj1> someReader2,
      ItemWriter someWriter2) {
    return stepBuilderFactory
    .get("writeAdvantageStep")
    .chunk(writeChunkSize)
    .reader(someReader2)
    .writer(someWriter2) //value of this writer is equal to someWriter2()
    .processor(new SomeProcessor())
    .faultTolerant()
    .build();
  }

  // reader step ...
 
  // processor step ...

   // writer step
  // somehow class one of the writer classes (I'll call it SomeWriter2)
}

作家1：

public class SomeWriter1 extends SomeWriter {
  private String jobName = "NIGHTLY"
}

作家2：

public class SomeWriter2 extends SomeWriter {
  private String jobName = "INTRADAY"
}

作家超类：

//should this class contain the code to write to the destination of the job?
public class SomeWriter implements ItemWriter<DTOObject>{
    @Override public void write(List<? extends DTOObject> item) throws Exception {
      //do something that involves the jobName property
    }
}

提前致谢！

Answer 1

下面的例子有效。 尝试时有任何错误。

超级作家class

@Slf4j
    public abstract class GenericWriter implements ItemWrite<String>{
    public abstract String jobName();
    @Overrride
    public void write(List<? extends String> list) throws Exception{
    log.info("job name {}", jobName());
    }
    }

扩展 GenericWriter

public class Writer1 extends GenericWriter{
@Override
public String jobName(){
return "Writer 1";
}
}