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Contents
require 'ludy/pattern_matcher'
if RUBY_VERSION < '1.9.0'
require 'ludy/kernel/singleton_method'
end
module Ludy
class MessageDispatcher
# create a dispatcher or append arg_list to the existed dispatcher,
# see Kernel#defun
def self.create actor, msg, args, &fun
if (@patchers ||= {})[[actor, msg]].nil?
@patchers[[actor, msg]] = MessageDispatcher.new actor, msg, args, &fun
else
@patchers[[actor, msg]].listen args, &fun
end
end
# actor is the listener who listen to the message
def initialize actor, msg, args, &fun
@actor = actor
@msg = msg
@matcher = PatternMatcher.new args, &fun
define_method_in_actor
end
# open your ear and listen, and call me when you hear
def listen arg_list, &fun
@matcher << [arg_list, fun]
end
private
def define_method_in_actor
# if @actor.respond_to? @msg
# raise RuntimeError.new("#{@actor.inspect}'s method \"#{@msg}\" already defined.")
# else
matcher = @matcher
msg = @msg # make them close in the closure
# TODO: how to distinct that you want instance method or singleton method?
define_method = @actor.kind_of?(Class) ? :define_method : :define_singleton_method
# comment off &block in lambda for ruby 1.8 compatibility
@actor.public_send define_method, msg do |*args|#, &block|
fun = matcher.first_match args
if fun.nil?
if self.respond_to? :method_missing
self.method_missing msg, *args#, &block
else
raise NoMethodError.new("#{self.inspect} doesn't respond to \"#{msg}\"")
end
else
fun.call(*args)#, &block)
end
end
# end
end
end
end # of Ludy
Version data entries
10 entries across 10 versions & 1 rubygems