Need a better way of setting initial state in instances of SCXMLExecutor
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Key: SCXML-156
URL: https://issues.apache.org/jira/browse/SCXML-156
Project: Commons SCXML
Issue Type: Improvement
Affects Versions: 0.9
Environment: local j2se
Reporter: Ant Kutschera
Priority: Minor
Example:
I have states RESERVED->BOOKED->PAID. The initial state is RESERVED. I create
a business entity which has this state and I need to persist it in state BOOKED.
I persist the state as a varchar / String. I don't want to persist a state
machine in my database.
When I load the entity in order to update the state to "PAID", I need to
instantiate the state machine, and update the state to "BOOKED", since that is
the status my object really has.
I can do this, only by modifying the InitialTarget of the SCXML using the API.
That isn't nice, because I only want one instance of SCXML, because loading the
XML is expensive in terms of time/cpu etc. The solution I've used now is to do
the update in a synchronized block, while being synchronized on the SCXML
instance, and then after I instantiate the SCXMLExecutor, I put the state back
in the SCXML to the original initial state.
Ideally, I would be able to pass the "starting state" to the constructor of the
SCXMLExecutor, to indicate that I am starting from a partially run workflow, if
that makes sense.
See this blog article too:
http://blog.maxant.co.uk/pebble/2010/08/26/1282857660000.html
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