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From "Rahul Akolkar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SCXML-47) Provide a state machine support class to allow for delegation.
Date Tue, 26 Jun 2007 21:06:26 GMT

    [ https://issues.apache.org/jira/browse/SCXML-47?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12508326
] 

Rahul Akolkar commented on SCXML-47:
------------------------------------

Indeed, that should be out of the way. Please ping if it isn't. While I was at it, I've added
the additional constructors that avoid the recurring parsing cost (by accepting the parsed
SCXML instance instead of the URL to the document).


> Provide a state machine support class to allow for delegation.
> --------------------------------------------------------------
>
>                 Key: SCXML-47
>                 URL: https://issues.apache.org/jira/browse/SCXML-47
>             Project: Commons SCXML
>          Issue Type: Improvement
>    Affects Versions: 0.6
>            Reporter: Michael Heuer
>            Priority: Minor
>             Fix For: 0.7
>
>         Attachments: additional-tests.tar.gz, state-machine-support-src.tar.gz
>
>
> This is not completely thought out yet, but if folks like the idea I might persue it
further.
> I would like to use AbstractStateMachine but cannot extend from it:
> class B extends A /*, AbstractStateMachine */ {
>   // copy source from AbstractStateMachine here
> }
> I propose here a StateMachineSupport class that provides for use by subclassing and for
use by delegation.  The constructors are a little messy, but in the end I have
> public class StateMachineSupport {
>   // use by subclassing
>   protected StateMachineSupport(...) {
>   }
>   // use by delegation
>   public StateMachineSupport(Object delegator, ...) {
>   }
>   // ... methods from AbstractStateMachine
> }
> public abstract class AbstractStateMachine extends StateMachineSupport {
>   protected AbstractStateMachine(...) {
>     super(...);
>   }
> }
> // use by subclassing
> class ConcreteStateMachine extends AbstractStateMachine {
>   ConcreteStateMachine() {
>     super(..."stopwatch.xml");
>   }
>   public void reset() { ... }
>   public void running() { ... }
>   public void paused() { ... }
>   public void stopped() { ... }
> }
> // use by delegation
> class DelegatingStateMachine extends SomethingElse {
>   StateMachineSupport delegate;
>   DelegatingStateMachine() {
>     delegate = new StateMachineSupport(this, ..."stopwatch.xml");
>   }
>   public void reset() { ... }
>   public void running() { ... }
>   public void paused() { ... }
>   public void stopped() { ... }
> }
> StateMachineSupport.java, AbstractStateMachine2.java, StateMachineSupportTest.java, and
AbstractStateMachine2Test.java attached.

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