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callbacks
The Event_Dispatcher acts as a notification dispatch table.
It is used to notify other objects of interesting things. This
information is encapsulated in Event_Notification objects. Client
objects register themselves with the Event_Dispatcher as observers of
specific notifications posted by other objects. When an event occurs,
an object posts an appropriate notification to the Event_Dispatcher.
The Event_Dispatcher dispatches a message to each registered
observer, passing the notification as the sole argument.
PR: ports/78889
Submitted by: Antonio Carlos Venancio Junior <antonio@php.net>
Notes:
svn path=/head/; revision=131454
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