PureMVC StateMachine lockable door demo

Mariush T. — Tue, 14 Jul 2009 15:06:31 +0000

I created and slightly modified Lockable Door application mentioned in StateMachine presentation by Cliff Hall. Application have 3 states OPENED, CLOSED and LOCKED, makes use of entry, exit guards and also sends CHANGED annoucement(notification) for specific(CLOSED) state. This demo is great for beginners learning PureMVC StateMachine Utility.

FSM for Lockable Door

<fsm initial={LockableDoor.STATE_CLOSED}>
    <state name={LockableDoor.STATE_CLOSED}
        exiting={ApplicationFacade.EXITING_CLOSED_STATE}
        changed={ApplicationFacade.CHANGED_CLOSED_STATE}>
        <transition action={LockableDoor.ACTION_OPEN} target={LockableDoor.STATE_OPENED}/>
        <transition action={LockableDoor.ACTION_LOCK} target={LockableDoor.STATE_LOCKED}/>
    state>
    <state name={LockableDoor.STATE_LOCKED}>
        <transition action={LockableDoor.ACTION_UNLOCK} target={LockableDoor.STATE_CLOSED}/>
    state>
    <state name={LockableDoor.STATE_OPENED}
        entering={ApplicationFacade.ENTERING_OPENED_STATE}>
        <transition action={LockableDoor.ACTION_CLOSE} target={LockableDoor.STATE_CLOSED}/>
    state>
fsm>

FSM Diagram for Lockable Door

Lockable Door demo

width="667" height="280" name="LockableDoor" align="middle"

play="true"

loop="false"

quality="high"

allowScriptAccess="sameDomain"

type="application/x-shockwave-flash"

pluginspage="http://www.adobe.com/go/getflashplayer">

Transition between States in PureMVC StateMachine Utility

Mariush T. — Tue, 14 Jul 2009 15:03:59 +0000

Below you can see what’s happening when transition between states occurs. First your application sends a StateMachine.ACTION Notification that triggers the StateMachine to begin a transition. Any state specific exiting or entering guard(Commands or Mediators) defined for the current and target state are notified. If transition is not cancelled the current state is changed to the target state and any state specific CHANGED annoucement is sent. And finally a generic annoucement of the CHANGED is sent.

Useful Resources:
Get your FSM on!
StateMachine Utility overview presentation by Cliff Hall
Lockable Door demo

Mariush T. - Freelance Flex/PureMVC Developer - blog » StateMachine

PureMVC StateMachine lockable door demo

Transition between States in PureMVC StateMachine Utility