implementation for ending a job per JSR-352 rules if it is
in progress and continuing if just starting.
JSR-352 states that artifacts cannot set the ExitStatus from within a split for a job.
to persist what the
last step that was executed was (used in Decisions and restarts).
Package org.springframework.batch.core.jsr.job.flow.support.state Description
JSR-352 specific states used in flow execution.
- Michael Minella, Mahmoud Ben Hassine