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Contents
module Callback
class CallbackContainer
def initialize
@callback_registry = Hash.new do |hash, key|
hash[key] = Array.new
end
end
# Defines the callback with the key in this container.
def define(key, callback_proc=nil, &callback_block)
callback = extract_callback(callback_block, callback_proc) do
raise "You must define the callback that accepts the call method."
end
@callback_registry[key] << callback
callback
end
# Undefines the callback with the key in this container.
def undefine(key, callback_proc)
callback = extract_callback(callback_proc) do
raise "You may only undefine callbacks that use the call method."
end
@callback_registry[key].delete callback
callback
end
# Notifies the callbacks for the key. Arguments may be passed.
# 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(key, *args, &error_handler)
@callback_registry[key].collect do |callback|
begin
callback.call(*args)
rescue Exception => e
yield(e) if error_handler
end
end
end
# Clears all of the callbacks in this container.
def clear
@callback_registry.clear
end
protected
def extract_callback(first_choice_callback, second_choice_callback = nil)
callback = nil
if first_choice_callback
callback = first_choice_callback
elsif second_choice_callback
callback = second_choice_callback
end
unless callback.respond_to? :call
yield
end
return callback
end
end
end
Version data entries
12 entries across 12 versions & 4 rubygems