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From Rahul Akolkar <rahul.akol...@gmail.com>
Subject Re: [scxml] passing data to the state
Date Mon, 12 Jul 2010 19:56:28 GMT
On Mon, Jul 12, 2010 at 3:18 PM, qin ding <qinding1@yahoo.com> wrote:
> Thank you, Rahaul, for your quick response.
>
> If I do the following:
>
> Player p = ... // POJO from game client
>   getEngine().getRootContext().set("player", p);
>
> then in the states, I should do this to get it out, right?
> Player p = (Player) getEngine().getRootContext().get("player");
>
> Somehow, when I do this, I get null out of the RootContext().  Any idea?
>
<snip/>

You should certainly get back what you've last set it to. I assume its
not null before the set, in which case its being modified elsewhere,
so we'll need more details.

-Rahul


> I will study the link you sent to me.
>
>
>
> ----- Original Message ----
> From: Rahul Akolkar <rahul.akolkar@gmail.com>
> To: Commons Users List <user@commons.apache.org>
> Sent: Mon, July 12, 2010 1:02:04 PM
> Subject: Re: [scxml] passing data to the state
>
> On Mon, Jul 12, 2010 at 12:49 PM, qin ding <qinding1@yahoo.com> wrote:
>> I am learning commons scxml.  I am experimenting writing a poker game using
>> activemq and scxml.
>>
>>
>> So, I have my config xml defined as follows:
>>
>> <?xml version="1.0"?>
>> <scxml xmlns="http://www.w3.org/2005/07/scxml"
>>        version="1.0"
>>        initialstate="waitingRound">
>>     <datamodel>
>>         <data name="inputPlayer">
>>           <!-- Note namespace declaration in line below -->
>>           <player xmlns="com.mgt.lottery.poker.domain">
>>             <id/>
>>             <name/>
>>             <chips/>
>>             <sitin/>
>>             <winner/>
>>             <betOption/>
>>             <gainedChips/>
>>             <popocketCards/>
>>             <description/>
>>             <bestHand/>
>>           </player>
>>         </data>
>>     </datamodel>
>>     <state id="waitingRound">
>>         <!-- shuffle deck and check players and empty pot -->
>>         <transition event="game.start" target="preflopRound"/>
>>     </state>
>>     <state id="preflopRound">
>>         <!-- place small/big blinds in pot and deal each player two hole
cards
>> -->
>>         <transition target="firstBettingRound"/>
>>     </state>
>>     <state id="firstBettingRound">
>>         <transition event="game.flop" target="flopRound"/>
>>         <transition event="game.showdown" target="showdownRound"/>
>>     </state>
>>     <state id="flopRound">
>>         <!-- deal three cards in the community -->
>>         <transition target="secondBettingRound"/>
>>     </state>
>>     <state id="secondBettingRound">
>>         <onentry>
>>             <var name="inputPlayer" expr="#{request$player}" />
>>         </onentry>
>>         <transition event="game.turn" target="turnRound"/>
>>         <transition event="game.showdown" target="showdownRound"/>
>>     </state>
>>     <state id="turnRound">
>>         <!-- deal a 4th card in the community -->
>>         <transition target="thirdBettingRound"/>
>>     </state>
>>     <state id="thirdBettingRound">
>>         <!-- deal a 4th card in the community -->
>>         <onentry>
>>             <var name="inputPlayer" expr="#{request$player}" />
>>         </onentry>
>>         <transition event="game.final" target="finalRound"/>
>>         <transition event="game.showdown" target="showdownRound"/>
>>     </state>
>>     <state id="finalRound">
>>         <!-- deal a 5th card in the community -->
>>         <transition target="finalBettingRound"/>
>>     </state>
>>     <state id="finalBettingRound">
>>         <!-- bet, check, call, raise, or fold -->
>>         <onentry>
>>             <var name="inputPlayer" expr="#{request$player}" />
>>         </onentry>
>>         <transition event="game.showdown" target="showdownRound"/>
>>     </state>
>>     <state id="showdownRound">
>>         <transition event="game.reset" target="waitingRound"/>
>>     </state>
>> </scxml>
>>
>> My questions:
>> How can I pass my pojo "Player" to the firstBettingRound, secondBettingRound
>>and
>> etc? This player object is coming from game client with betting information.
>>
> <snip/>
>
> Data (including POJOs) can be passed into an executor either via an
> external event's payload or via procedural injection to the executor's
> root context.
>
> So, as an example of the latter, the following will create a variable
> "player" in the executor's root context and bind the POJO to it:
>
>   Player p = ... // POJO from game client
>   getEngine().getRootContext().set("player", p);
>
> Subsequently, the variable "player" may be used in expressions in the
> state machine.
>
> In the above state machine, the variable "inputPlayer" doesn't seem to
> be accessed anywhere, so unless the player information is needed for
> the state machine logic, it can perhaps stay out of the state
> machine's root context altogether (given the pattern of use you
> mention below).
>
>
>> After the activemq delivers it to the server end,  how can I know which method
>> to call?  I think scxml handles the the state of game, so I have to say
>>
>>
>> Set states = getEngine().getCurrentStatus().getStates();
>>         return ((org.apache.commons.scxml.model.State) states.iterator().
>>                 next()).getId();
>>
>> if the current state is firstBettingRound,  I do
>> game.firstBettingRound(player);  Is it correct
>>
> <snap/>
>
> If you wanted to map states to activities that way. There are a few
> patterns that are commonly used, see:
>
>   http://commons.apache.org/scxml/guide/using-commons-scxml.html
>
> -Rahul
>
>
>> I seem unable to find the example to show me how to pass pojo to the state
>> correcponded method.  If I am completely wrong with my approach, Please
> advise.
>> Thank you very much.
>>
>> QD
>>

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