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https://issues.apache.org/jira/browse/SCXML-156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rahul Akolkar resolved SCXML-156.
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Resolution: Not A Problem
This can simply be done along these lines (Java 1.4):
public void setCurrentState(SCXMLExecutor exec, String state) {
Set states = exec.getCurrentStatus().getStates();
states.clear();
TransitionTarget tt = (TransitionTarget)
exec.getStateMachine().getTargets().get(state);
states.add(tt);
}
You can find a more resilient version of the above method here which uses
generics (search for "setCurrentState"):
http://svn.apache.org/repos/asf/commons/proper/scxml/branches/J6/src/test/java/org/apache/commons/scxml/SCXMLTestHelper.java
WRT the AbstractStateMachine class, that was built as the simplest pattern, I
wouldn't put it to any serious use.
> Need a better way of setting initial state in instances of SCXMLExecutor
> ------------------------------------------------------------------------
>
> 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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