Repeating a Step x times in Spring Batch

Question

I\'m using Spring Batch 3.0.3 configured with annotation to create a batch job that repeats a step an undetermined number of times.

My first step will read into memory a

Answer 1

The way I'd approach this is via the following:

1. First step loads the list.
2. Second step processes an item in the list.
3. The second step has a StepExecutionListener that evaluates if there are more items in the list to process. If so, it returns an ExitStatus that maps to the same step. If not, it returns an ExitStatus that maps to end the job or continue the job (based on the rest of the flow).

For example:

StepExecutionListener

public class MyListener {

    @Autowired
    private List myItems;

    @AfterStep
    public ExitStatus afterStep(StepExecution stepExecution) {
        if(myItems.size() > 0) {
            return new ExitStatus("CONTINUE");
        }
        else {
            return new ExitStatus("FINISHED");
        }
    }
}

Job Configuration

...
@Bean
public Step step1() {...}

@Bean
public MyListener listener() {..}

@Bean
public Step step2(MyListener listener) {
    return stepBuilder.get("step2")
                .tasklet(myTasklet()) // Replace this piece as needed
                .listener(listener).build();
}

@Bean
public Job job1(Step step1, Step step2) {
    return jobBuilder.get("job1")
                     .start(step1)
                     .next(step2).on("CONTINUE").to(step2).on("FINISHED").end()
                     .build();
}
...

Note I have not tested this code so there may be typos, etc.