Spring Batch - Pass data across steps

1) use step execution or job execution to transfer data from one step to another, but if the data is huge, it is not good as spring will store the data to be transferred to job repository if via step execution or job execution.

2) use own java beans to pass data.

• This is data holder to be passed across steps

@Component
public class PublicCompanyHolder {

private List<PublicCompanyInfo> publicCompanyList;

public List<PublicCompanyInfo> getPublicCompanyList() {
return publicCompanyList;
}

public void setPublicCompanyList(List<PublicCompanyInfo> publicCompanyList) {
this.publicCompanyList = publicCompanyList;
}

}

• set data to holder in step 1

@Component("pubTasklet")
public class PubTasklet implements Tasklet {

@Autowired
private PublicCompanyHolder publicCompanyHolder;

public RepeatStatus execute(StepContribution contribution,
ChunkContext chunkContext) throws Exception {

List<PublicCompanyInfo> infoContainer = new ArrayList<PublicCompanyInfo>();

for (int i=0; i < 10; i++) {
PublicCompanyInfo info = new PublicCompanyInfo();
info.setPublicCompanyId("ID-" + i);
info.setPublicCompanyName("Name*" + i);
infoContainer.add(info);
}
publicCompanyHolder.setPublicCompanyList(infoContainer);

return RepeatStatus.FINISHED;
}

}

• get data from holder in step 2

@Component("pubTasklet2")

public class PubTasklet2 implements Tasklet {

@Autowired

private PublicCompanyHolder publicCompanyHolder;

public RepeatStatus execute(StepContribution contribution,

ChunkContext chunkContext) throws Exception {

System.out.println("received holder:" + publicCompanyHolder.getPublicCompanyList());

return RepeatStatus.FINISHED;

}

}

• define the job

<job id="pubJob" restartable="true">

<step id="step1" next="step2">

<tasklet ref="pubTasklet" />

</step>

<step id="step2" next="step1">  // if you do not want to loop, remove next

<tasklet ref="pubTasklet2" />

</step>

<listeners>

<listener ref="pubListener" />

</listeners>

</job>