FlatFileHeaderCallback with access to ExecutionContext

[kenston]

Hello.

I'm using FlatFileItemWriter with FlatFileHeaderCallback. My FlatFileHeaderCallback needs to retrieve some values from the ExecutionContext. How will my FlatFileHeaderCallback implementation gain access to the ExecutionContext?

I tried implementing the StepExecutionListener and the ItemStream, but none of their methods were called.

Alternative approaches I see seem to look more like a workaround:
1. Create an ItemWriter that either extends or wraps a FlatFileItemWriter, and override or implement either StepExecutionListener or ItemStream to get the ExecutionContext and pass it to the FlatFileHeaderCallback implementation's constructor.
2. Add a StepExecutionListener in the step and pass the FlatFileHeaderCallback implementation. StepExecutionListener will then set the ExecutionContext.

Any suggestions?

Thanks!

[jpraet]

You can inject the values directly from the ExecutionContext into the header callback with SpEL expressions if you use scope="step".

<bean id="headerCallback" class="MyHeaderCallback" scope="step">
    <property name="foo" value="#{jobExecutionContext['foo']}" />
</bean>

The StepExecutionListener or ItemStream approaches should work too, but you need to register them properly in your step configuration.

[kenston]

Great, thanks jpraet for the suggestion. I referred back to the documentation.
Also, I actually forgot to register the one implementing the StepExecutionListener, and it now works.