Improve possibility to extending (subclassing) the default semantics
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Key: SCXML-27
URL: http://issues.apache.org/jira/browse/SCXML-27
Project: Commons SCXML
Issue Type: Improvement
Affects Versions: 0.5
Reporter: Hallvard Trætteberg
I've extended the default SCXML semantics (subclassed SCXMLSemanticsImpl) with
a more flexible event matching method. However, this required copying a lot of
code from SCXMLSemanticsImpl, just to replace the event matching method. The
problem was that the eventMatch method takes String and Set arguments, with no
way to get at the Transition who's event is to be tested. I copied the relevant
code and replaced eventMatch(String,Set) with eventMatch(Transition,Set), to
make it more flexible. I ask that this change is made to SCXMLSemanticsImpl, to
better support overriding.
The flexibility I've added is to use regular expressions for matching, and
since this happens often, I wanted to cache the compiled pattern. The natural
place to do this is the Transition, so I subclassed the Transition class,
included a field for holding the compiled pattern and made sure to use this
subclass whenever a regexp was needed. Then in the modified eventMatch code, I
check whether the Transition is of this subclass and used the cache to improve
performance.
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