没有重复的Spring Batch决策器

Question

I have a case where I have a user input lets call it RunningMode. The input can have 3 possible states: STATE1, STATE2, STATE1_AND_STATE2. The logic to implement is as follows if STATE1 is set then stepA should be executed if STATE2 is set then stepB should be executed and finally if STATE1_AND_STATE2 is set then I should run in parallel stepA and stepB.

I know how to solve this in an ugly way like this:

<batch:decision id="makeWorkFlowDecision" decider="myDecider"> 
                    <batch:next on="STATE1" to="stepA" /> 
                    <batch:next on="STATE2" to="stepB" />
                    <batch:next on="STATE1_AND_STATE2" to="stepC" />
</batch:decision>

<batch:split id="stepA" task-executor="taskExecutor">
<!-- content of stepA -->     
</batch:split>   
<batch:split id="stepB" task-executor="taskExecutor">
<!-- content of stepB -->     
</batch:split>    

<batch:split id="stepC" task-executor="taskExecutor">
<!-- content of stepA --> 
<!-- content of stepB -->     
</batch:split>  

Like you can see there is duplication in stepC. I repeat content of stepA and stepB. Plus as far as I know in stepC stepA and stepB won't run in parallel. Content of stepA and stepB consists of 2 flow blocks each in which I define steps. Is there a way to have conditional next on stepA ?

Answer 1

Below is an example of what Luca is describing:

<flow id="flowA">
    <!-- stepA related steps here -->
</flow>

<flow id="flowB">
    <!-- stepB related steps here -->
</flow>

<batch:split id="stepA" task-executor="taskExecutor">
    <flow parent="flowA"/>
</batch:split>   
<batch:split id="stepB" task-executor="taskExecutor">
    <flow parent="flowB"/>
</batch:split>    

<batch:split id="stepC" task-executor="taskExecutor">
    <flow ref="flowA"/>
    <flow ref="flowB"/>
</batch:split>  

Answer 2

SB (as Spring is general) allow you to define abstract step .
You can define abstract stepA and stepB and split using parent property (check split-flow official documentation for example).