There are three big changes in the 0.7.x codebase that I want to
highlight and solicit opinion on.
1. Exceptions. I've revised our handling of server and client errors
so that we throw exceptions up the stack rather than trying to do
output way down at the bottom of the stack. I've only changed
stuff at the crudest level, but this is how we'll be handling
errors for future versions of the code. (Hooray! Welcome to PHP
5!) common_user_error() and common_server_error() will soon go
away... I hope.
2. Events. I've add a simple framework based on the MediaWiki hooks
system to let third-party code handle system events. Client code
uses Event::addHandler($name, $callable) to add a handler for a
named event. Core code uses Event::handle($name, array($arg1,
$arg2, $arg3) to handle an event. Handlers can either enhance or
completely replace core code. Handlers throw exceptions if they
have errors. Current named events can be found in EVENTS.txt; this
documentation probably needs a more permanent home.
3. Plugins. I've added a simple plugin class to automatically
register event handlers. Plugins can subclass "Plugin" and then
can handle events simply by having an onEventName($arg1, $arg2,
$arg3) method. There's now a plugins directory with a sample
plugin for Google Analytics.
This is still only partially baked (unreleased code, just in the dev
branch) so there's time to make modifications. I of course find the
whole thing incredibly elegant and well-designed, but YMMV.
-Evan
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