JSR 352: Is there a way to tell if a particular job execution is a restart or not from within a job?

Question

I know how to get the Execution Id and Instance Id of a job using the Job Context. But if i restart a job, is there way to know if the job execution is the first execution or a restart within the job, for instance inside the reader?

Given that a previous execution could have failed anywhere: in a previous step, earlier in the current step (this reader is part of), you have to ask do you really want to know if the job has restarted or do you really want to know if whatever code you're about to execute in the reader has already executed? — Scott Kurz, May 11 '16 at 12:03
I just want to know if the current execution is a restart or not, ideally in a listener's beforeStep() or beforeJob() — Fazil Hussain, May 12 '16 at 04:17

score 2 · Answer 1 · answered May 11 '16 at 11:13

2

No, but there is an open issue asking for that: https://java.net/bugzilla/show_bug.cgi?id=7473

answered May 11 '16 at 11:13

DFollis

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The link is dead as java.net has apparently been retired. – Matthias Aug 31 '23 at 13:34
Updated link for the same issue now at the new Jakarta Batch site: https://github.com/eclipse-ee4j/batch-api/issues/93 – Scott Kurz Sep 02 '23 at 03:36

score 2 · Accepted Answer · answered May 12 '16 at 04:46

This is a bit overly complicated (as the other answer noted, there's an issue opened to consider enhancement for the future Batch 1.1).

You could do this:

//
// Assumes JobContext injected into 'jobCtx' field
//
private boolean isRestart() {
    JobOperator jo = BatchRuntime.getJobOperator();
    JobInstance jobInstance = jo.getJobInstance(jobCtx.getExecutionId());
    int numExecutions = jo.getJobExecutions(jobInstance).size();
    return numExecutions > 1;
}

JSR 352: Is there a way to tell if a particular job execution is a restart or not from within a job?

2 Answers2