rcosjava-general

RE: (Fwd) RE: Re: [Rcosjava-general] messaging system

[<and...@ne...>]

>Andrew,
>
>I don't understand how a post office gets a registeredHandler 
>without a call to super(id) in OSOffice, which would call 
>addHandler(). I assume things would happen like this:
>
>OSOffice osPostOffice = new OSOffice(M_ID);
>// calls OSOffice constructor
>OSOffice(String newId)
>{
>    id = newId;
>}
>// no call to super: compiler inserts super() which calls
>PostOffice(){ }
>// does nothing!!! so the compiler inserts another super() ending up at
>SimpleMessageHandler(){ }
>// which also does nothing.
>
>I see that the OSOffice constructor initialises id, which is a member 
>of SimpleMessageHandler (supersuperclass). 
>
>I must be barking up the wrong tree but I can't figure this out.
>

I hope I'm following what you want.  You're wondering how an OS or Animator level object registers with their PostOffice.  That is, how does it end up in the registeredHandlers TreeMap and receive messages to process.

For example, the Kernel calls super(String, OSOffice).  OSMessageHandler creates a new AddHandler message and calls processMessage on the OSOffice.  AddHandler calls the addHandler method on PostOffice (which actually is found in SimpleMessageHandler).  This adds the Kernel to registeredHandlers.

Animators do the same thing except using AnimatorMessageHandler and AnimatorOffice.

The stuff that is confusing is the constructor in PostOffice.  For example, type (the class name) is not used by anything but exists there.
-- 




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RE: (Fwd) RE: Re: [Rcosjava-general] messaging system

[<and...@ne...>]

I've just updated PostOffice, AnimatorOffice and OSOffice with the changes.  The PostOffice(String) consrtructor nolonger calls addHandler and Animator and OS office both call super(String).  What's more, it still works! :-)
-- 




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RE: (Fwd) RE: Re: [Rcosjava-general] messaging system

[Peggy N. <pe...@ip...>]

Hi Andrew,

Doh! I'd forgotten to follow up that AddHandler message to look for 
an answer.  I think I tried to block it out from my mind, being one of 
the messages I traced through while trying to understand messaging, 
without any luck.

That makes complete sense, to register from the OSMsgHandler 
constructor. Thanks.

Regards,
Peggy





> I hope I'm following what you want.  You're wondering how an OS or
> Animator level object registers with their PostOffice.  That is, how
> does it end up in the registeredHandlers TreeMap and receive messages
> to process.
> 
> For example, the Kernel calls super(String, OSOffice). 
> OSMessageHandler creates a new AddHandler message and calls
> processMessage on the OSOffice.  AddHandler calls the addHandler
> method on PostOffice (which actually is found in
> SimpleMessageHandler).  This adds the Kernel to registeredHandlers.
> 
> Animators do the same thing except using AnimatorMessageHandler and
> AnimatorOffice.
> 
> The stuff that is confusing is the constructor in PostOffice.  For
> example, type (the class name) is not used by anything but exists
> there. -- 
> 
> 
> 
> 
> __________________________________________________________________
> Your favorite stores, helpful shopping tools and great gift ideas.
> Experience the convenience of buying online with Shop@Netscape!
> http://shopnow.netscape.com/
> 
> Get your own FREE, personal Netscape Mail account today at
> http://webmail.netscape.com/
> 
> 
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