How to continually run a Spring Batch job - spring-batch

Question

What is the best way to continually run a Spring Batch job? Do we need to write a shell file which loops and starts the job at predefined intervals? Or is there a way within Spring Batch itself to configure a job so that it repeats at either
1) pre-defined intervals
2) after the completion of each run
Thanks

Answer 1

If you want to launch your jobs periodically, you can combine Spring Scheduler and Spring Batch. Here is a concrete example : Spring Scheduler + Batch Example.
If you want to re-launch your job continually (Are you sure !), You can configure a Job Listener on your job. Then, through the method jobListener.afterJob(JobExecution jobExecution) you can relaunch your job.

Answer 2

Id did something like this for importing emails, so i have to check it periodically
#SpringBootApplication
#EnableScheduling
public class ImportBillingFromEmailBatchRunner
{
private static final Logger LOG = LoggerFactory.getLogger(ImportBillingFromEmailBatchRunner.class);
public static void main(String[] args)
{
SpringApplication app = new SpringApplication(ImportBillingFromEmailBatchRunner.class);
app.run(args);
}
#Bean
BillingEmailCronService billingEmailCronService()
{
return new BillingEmailCronService();
}
}
So the BillingEmailCronService takes care of the continuation:
public class BillingEmailCronService
{
private static final Logger LOG = LoggerFactory.getLogger(BillingEmailCronService.class);
#Autowired
private JobLauncher jobLauncher;
#Autowired
private JobExplorer jobExplorer;
#Autowired
private JobRepository jobRepository;
#Autowired
private JobBuilderFactory jobBuilderFactory;
#Autowired
private #Qualifier(BillingBatchConfig.QUALIFIER)
Step fetchBillingFromEmailsStep;
#Scheduled(fixedDelay = 5000)
public void run()
{
LOG.info("Procesando correos con facturas...");
try
{
Job job = createNewJob();
JobParameters jobParameters = new JobParameters();
jobLauncher.run(job, jobParameters);
}catch(...)
{
//Handle each exception
}
}
}
Implement your createNewJob logic and try it out.

Answer 3

one easy way would be configure cron job from Unix which will run application at specified interval