A Suggestion to enhance SCXMLExecutor and SCInstance class to support state
persistence
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Key: SCXML-20
URL: http://issues.apache.org/jira/browse/SCXML-20
Project: Commons SCXML
Issue Type: New Feature
Affects Versions: 0.5
Environment: Windows, JDK 1.4.2 and above
Reporter: Sitthichai Rernglertpricha
Currently, SCXMLExecutor and SCInstance does not implement Serializable. Hence,
under a clustered application server environment, they cannot be persisted by
the application server for session failover.
Instead of changing SCXMLExecutor and SCInstance to implement Serializable, an
alternative is to leverage on the Memento design pattern so that SCXMLExecutor
and SCInstance class can persist their states via 2 new saveState() and
restoreState() methods. Both methods are passed a new ExecutorState interface
object. The SCXMLExecutor and SCInstance class will save their states into the
ExecutorState object when their saveState() methods are called, and reload
their states from the ExecutorState object when their restoreState() methods
are called. Different child implementation of the ExecutorState interface will
then handle the actual persistence to appropriate channel, and decide what need
to persist and what need not.
For your consideration, I have attached patches to SCXMLExecutor and SCInstance
class with the 2 new saveState() and restoreState() methods, and the new
ExecutorState interface class.I have also attached a web application (tested
under Geronimo ) illustrating an implementation under Servlet environment.
Please refer to the readme.txt in the WAR file for more details.
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