understanding dynamic job parameter

[SARAL SAXENA]

Hi,

I have developed an small application for spring batch...in order to understand its complete functionality but on class dynamic job parameter is being used , i didn't understand that why it is being used and it is also configured in xml file also...I am sending u the code have a look @ it...and plz explain.......


DynamicJobParameters
import java.util.Date;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.JobParametersBuilde r;
import org.springframework.batch.core.JobParametersIncrem enter;


public class DynamicJobParameters implements JobParametersIncrementer {

public JobParameters getNext(JobParameters parameters) {

parameters = new JobParametersBuilder().addDate("schedule.time",new Date()).toJobParameters();
return parameters;
}
}


file2file.xml
*********

<beans:bean id="dynamicJobParameters" class="com.ecomputercoach.file.DynamicJobParameter s"/>


<job id="careerProcessorJob" job-repository="jobRepository" incrementer="dynamicJobParameters"> <step id="step1">
<tasklet transaction-manager="jobRepository-transactionManager" >
<chunk reader="playerFileItemReader" processor="careerProcessor" writer="playerFileItemWriter"
commit-interval="10" />
</tasklet>
</step>
</job>
</beans:beans>

[raysuliteanu]

I don't understand your question but one problem I see in your code example is that you're not propagating any existing job parameters, so if you had any when the job started, they'd be lost.

public class DynamicJobParameters implements JobParametersIncrementer {
    public JobParameters getNext(JobParameters parameters) {
        if (parameters == null) {
            parameters = new JobParameters();
        }

        parameters = new JobParametersBuilder(parameters).addDate("schedule.time",new Date()).toJobParameters();

        return parameters; 
    }
}