Begin forwarded message:
From: Antony Blakey <[EMAIL PROTECTED]>
Date: October 29, 2008 8:36:49 AM CEST
To: Stéphane Ducasse <[EMAIL PROTECTED]>
Subject: Re: [Pharo-project] ToolSet
On 29/10/2008, at 5:55 PM, Stéphane Ducasse wrote:
With a registration in a post load phase the tool registers and the
MENU or whatever does not have to do a
query over the complete system.
When I mean discovery, I don't mean that the discovery is performed
every time. Discovery is used on two occasions:
1. When re-initializing the system.
2. When showing the user what methods define commands i.e. a UI for
system exploration.
Discovery finds the methods, and then you call those methods, which
return a command, which you then 'register'. So really, it's like a
registration system but the framework is declarative rather than
programatic.
You need the ability to listen for method redefinitions, so that you
can incrementally maintain the registration data, but even that can
be lazily batched i.e. when a method containing a 'pragma' symbol
(or pragma if you want) is redefined, you clear the registration
cache, and the next call recreates it.
For a full command invocation system such as Commando, there are a
number of optimizations I do, such as maintaining a cache of
accelerators -> applicable commands, and context classes ->
applicable commands. I use Commando in both VW and Squeak, and there
is no delay, because everything is cached.
Antony Blakey
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