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module Callback
module InstanceMethods
# Registers a callback for the event on the object. The callback can either be a block or a proc.
# When the callbacks are notified, the return value of the proc is passed to the caller.
def register_callback(event, callback_proc=nil, &callback_block)
callbacks.define(event, callback_proc, &callback_block)
end
# Removes the callback from the event. The callback proc must be the same
# object as the one that was passed to register_callback.
def unregister_callback(event, callback_proc)
callbacks.undefine(event, callback_proc)
end
protected
# Notifies the callbacks registered with the event on the object. Arguments can be passed to the callbacks.
# An error handler may be passed in as a block. If there is an error, the block is called with
# error object as an argument.
# An array of the return values of the callbacks is returned.
def notify_callbacks(event, *args, &error_handler)
callbacks.notify(event, *args, &error_handler)
end
def notify_class_callbacks(event, *args, &error_handler)
self.class.send(:notify_callbacks, event, *args, &error_handler)
end
# The CallbackContainer for this object.
def callbacks
@callbacks ||= CallbackContainer.new
end
end
end
class Object
include Callback::InstanceMethods
end
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