spring batch conditional if step - spring-batch

Question

The Spring Batch documentation does a pretty good job explaining how to correctly define a job with steps that pattern this:
call Step 1
if (some condition determined by a Decider) {
call Step 2
} ELSE {
call Step 3
}
However, I'm trying to achieve THIS in Java config:
call Step 1
if (some condition determined by a decider) {
call step 2
}
call step 3
call step 4
.. so on and so forth ..
and I think I might be misreading the API because I can't seem to get the conditional IF logic to behave as one would expect -- all that happens is when the decider evaluates to True it runs step 2 but never runs Step 3 .. and of course when the decider evaluates to false it runs only step 3. Does anybody have any examples for how to do a conditional step of this sort in Java config?

Answer 1

you should define your decider, for that you have two choices.
A class that implements JobExecutionDecider or to define a bean as shown in the above example :
#Bean
public JobExecutionDecider decider() {
return (JobExecution jobExecution, StepExecution stepExecution) -> {
// write code here
boolean someCondition = true;
return someCondition ? new FlowExecutionStatus("COMPLETED") : new FlowExecutionStatus("FAILED");
};
}
after that, you can define your flow using this decider like this :
#Bean
public Job job() {
return jobBuilderFactory.get("job").incrementer(new RunIdIncrementer()).start(step1()).next(decider())
.on("COMPLETED").to(step2()).from(decider()).on("FAILED").to(step3()).end().build();
}
the whole definition of your job with steps should look like this :
#Configuration
public class MJob {
#Autowired
private JobBuilderFactory jobBuilderFactory;
#Autowired
private StepBuilderFactory stepBuilderFactory;
#Bean
public Job job() {
return jobBuilderFactory.get("job").incrementer(new RunIdIncrementer()).start(step1()).next(decider())
.on("COMPLETED").to(step2()).from(decider()).on("FAILED").to(step3()).end().build();
}
#Bean
public JobExecutionDecider decider() {
return (JobExecution jobExecution, StepExecution stepExecution) -> {
// write code here
boolean someCondition = true;
return someCondition ? new FlowExecutionStatus("COMPLETED") : new FlowExecutionStatus("FAILED");
};
}
public Step step1() {
return stepBuilderFactory.get("step1").tasklet(new Step1()).build();
}
public Step step2() {
return stepBuilderFactory.get("step2").tasklet(new Step2()).build();
}
public Step step3() {
return stepBuilderFactory.get("step3").tasklet(new Step3()).build();
}
}
Is this answer your question?