[Seaside] Announcement or simple method call (Command Pattern)

stephane ducasse stephane.ducasse at free.fr
Mon Jan 14 18:59:04 UTC 2008

On Jan 14, 2008, at 5:03 PM, Sebastian Sastre wrote:

> Hi Oleg,
> 	I think it depends on who wants to communicate to whom and the
> coupling level you want/need. I'll evade the use of announcements  
> where
> loose coupling is not needed. But in the other hand the bigger the  
> component
> reuse the bigger the need of loose coupling. Remember that loose  
> coupling is
> needed when a children wants to communicate something about it's  
> state to
> potential parents or any subscriber without understanding anything  
> about
> them. If situation is simpler than that, and you can achieve the same
> feature with a simple message send, so do it. You don't need/want to
> complicate things just for fun.

Thanks for sharing that with us.
We need to record such practices and advices.

> 	About components that should be disabled, I think you can use a
> request (SURequest) to update the state of that component in the  
> server
> side. That way, when the command is called it can announce or not  
> depending
> on that state which your application (other components for instance)  
> can
> silently update it's state using this request.
> 	cheers,
> Sebastian Sastre
>> -----Mensaje original-----
>> De: seaside-bounces at lists.squeakfoundation.org
>> [mailto:seaside-bounces at lists.squeakfoundation.org] En nombre
>> de Oleg Richards
>> Enviado el: Lunes, 14 de Enero de 2008 06:16
>> Para: seaside at lists.squeakfoundation.org
>> Asunto: [Seaside] Announcement or simple method call (Command  
>> Pattern)
>> Hello Guys!
>> I want to use command pattern in my application and use
>> announcements framework to invoke the same command in the
>> same component from different places. Now it was done using
>> simple method call. How do u think: Should i refactor my
>> application to "command pattern"?
>> I'm afraid of one thing: For example one my component will
>> subscribe to special command. When this component will be
>> visible this is perfect. But what will be done if this
>> component call another one, so it will be not visible, but
>> not destroyed because it will be standing in stack of
>> backtrace. Is it a danger? I dont want him to receive this
>> message, when it is not active. And i also don't want to
>> unsubscribe from event in every call procedure..
>> What do you think?
>> Cheers, Oleg
>> --
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>> http://www.nabble.com/Announcement-or-simple-method-call-%28Co
> mmand-Pattern%29-tp14796959p14796959.html
>> Sent from the Squeak - Seaside mailing list archive at Nabble.com.
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