spring batch - how to execute purge tasklet - spring

Question

I have written a simple spring batch tasklet which calls a dao method which in turn does some deletes. But I am not sure what I should be doing to call the job.
public class RemoveSpringBatchHistoryTasklet implements Tasklet {
#Autowired
private SpringBatchDao springBatchDao;
public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext)
throws Exception {
contribution.incrementWriteCount(springBatchDao.purge());
return RepeatStatus.FINISHED;
}
}
So far to execute my spring batch jobs I am using quartz triggers with a setup like so. Each job has it's own xml file which has a read and a writer.
<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="jobDetails">
<list>
<ref bean="dailyTranCountJobDetail" />
</list>
</property>
<property name="triggers">
<list>
<ref bean="dailyTranCountCronTrigger" />
</list>
</property>
</bean>
<bean id="dailyTranCountCronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
<property name="jobDetail" ref="dailyTranCountJobDetail" />
<property name="cronExpression" value="#{batchProps['cron.dailyTranCounts']}" />
</bean>
<bean id="dailyTranCountJobDetail" class="org.springframework.scheduling.quartz.JobDetailBean">
<property name="jobClass" value="com.myer.reporting.batch.JobLauncherDetails" />
<property name="group" value="quartz-batch" />
<property name="jobDataAsMap">
<map>
<entry key="jobName" value="job-daily-tran-counts" />
<entry key="jobLocator" value-ref="jobRegistry" />
<entry key="jobLauncher" value-ref="jobLauncher" />
</map>
</property>
</bean>
And then here is an example of the job file itself with a reader and a writer.
<job id="job-daily-tran-counts" xmlns="http://www.springframework.org/schema/batch">
<step id="job-daily-tran-counts-step1">
<tasklet transaction-manager="custDbTransactionManager">
<chunk
reader="dailyTranCountJdbcCursorItemReader"
writer="dailyTranCountItemWriter"
commit-interval="1000" />
</tasklet>
</step>
</job>
<bean id="dailyTranCountJdbcCursorItemReader"
class="com.myer.reporting.dao.itemreader.DailyTranCountJdbcCursorItemReader"
scope="step"
parent="abstractEposJdbcDao">
<property name="rowMapper">
<bean class="com.myer.reporting.dao.mapper.DailyTranCountMapper" />
</property>
</bean>
<bean id="dailyTranCountItemWriter"
class="com.myer.reporting.dao.itemwriter.DailyTranCountItemWriter"
parent="abstractCustDbJdbcDao"/>
Obviously for this new job there is no reader or writer. So what it he best/correct way for me to execute my new tasklet?
thanks

Answer 1

I prefer java configuration instead of xml. You can configure your tasklet with the following code:
#Configuration
#EnableBatchProcessing
public class BatchCleanUpJobsConfiguration {
#Bean
public Job batchCleanUpJob(final JobBuilderFactory jobBuilderFactory,
final StepBuilderFactory stepBuilderFactory,
final RemoveSpringBatchHistoryTasklet removeSpringBatchHistoryTasklet) {
return jobBuilderFactory.get("batchCleanUpJob")
.start(stepBuilderFactory.get("batchCleanUpStep")
.tasklet(removeSpringBatchHistoryTasklet)
.build())
.build();
}
#Bean
public RemoveSpringBatchHistoryTasklet batchCleanUpTasklet(final JdbcTemplate jdbcTemplate) {
final var tasklet = new RemoveSpringBatchHistoryTasklet();
tasklet.setJdbcTemplate(jdbcTemplate);
return tasklet;
}
}
To schedule your new job use the following code:
#Component
#RequiredArgsConstructor
public class BatchCleanUpJobsScheduler {
private final Job batchCleanUpJob;
private final JobLauncher launcher;
#Scheduled(cron = "0 0 0 * * MON-FRI")
public void launchBatchCleanupJob()
throws JobParametersInvalidException, JobExecutionAlreadyRunningException,
JobRestartException, JobInstanceAlreadyCompleteException {
launcher.run(
batchCleanUpJob,
new JobParametersBuilder()
.addLong("launchTime", System.currentTimeMillis())
.toJobParameters());
}
}