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Contents
##
# <project.root>/lib/skn_utils/exploring/commander.rb
##
# ref: https://github.com/saturnflyer/direction
##
# Provide a feature like the Forwardable library,
# but set the return value to self.
# It provides a class level "command" method to do
# message forwarding.
#
# class SomeClass
# extend SknUtils::Commander
#
# command [:print_details, :setup_things] => :collaborator
# query [:name, :id] => :collaborator, :type => :@partner
# end
#
# This will define methods on instances that forward to the
# provided receiver while enforcing encapsulation of the
# relationship between objects.
#
# the collaborator and you must agree on how results can be exchanged
# you might provide a callback method for it to set its return value on you
# :callback, develop a protocol to exchange messages with collaborator
##
module SknUtils
module Exploring
module Commander
# Forward messages and return self, protecting the encapsulation of the object
def command(options)
Commander.define_methods(self, options) do |command, accessor|
%{
def #{command}(*args, &block)
#{accessor}.__send__(:#{command}, *args, &block)
self
end
}
end
end
# Forward messages and return the result of the forwarded message
def query(options)
Commander.define_methods(self, options) do |query, accessor|
%{
def #{query}(*args, &block)
#{accessor}.__send__(:#{query}, *args, &block)
end
}
end
end
# Commander's class method
def self.define_methods(mod, options)
method_defs = []
options.each_pair do |method_names, accessor|
Array(method_names).map do |message|
method_defs.push yield(message, accessor)
end
end
mod.class_eval method_defs.join("\n"), __FILE__, __LINE__
end
end # Commander
end # Exploring
end # SknUtils
Version data entries
31 entries across 31 versions & 1 rubygems