\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// File Manager

File Manager

Path: /opt/chef/embedded/lib/ruby/gems/2.7.0/gems/test-unit-3.3.4/lib/test/unit/util/

Viewing File: observable.rb

#--
#
# Author:: Nathaniel Talbott.
# Copyright:: Copyright (c) 2000-2002 Nathaniel Talbott. All rights reserved.
# License:: Ruby license.

require 'test/unit/util/procwrapper'

module Test
  module Unit
    module Util

      # This is a utility class that allows anything mixing
      # it in to notify a set of listeners about interesting
      # events.
      module Observable
        # We use this for defaults since nil might mean something
        NOTHING = "NOTHING/#{__id__}"

        # Adds the passed proc as a listener on the
        # channel indicated by channel_name. listener_key
        # is used to remove the listener later; if none is
        # specified, the proc itself is used.
        #
        # Whatever is used as the listener_key is
        # returned, making it very easy to use the proc
        # itself as the listener_key:
        #
        #     listener = add_listener("Channel") { ... }
        #     remove_listener("Channel", listener)
        def add_listener(channel_name, listener_key=NOTHING, &listener) # :yields: value
          unless(block_given?)
            raise ArgumentError.new("No callback was passed as a listener")
          end
      
          key = listener_key
          if (listener_key == NOTHING)
            listener_key = listener
            key = ProcWrapper.new(listener)
          end
      
          channels[channel_name] ||= {}
          channels[channel_name][key] = listener
          return listener_key
        end

        # Removes the listener indicated by listener_key
        # from the channel indicated by
        # channel_name. Returns the registered proc, or
        # nil if none was found.
        def remove_listener(channel_name, listener_key)
          channel = channels[channel_name]
          return nil unless (channel)
          key = listener_key
          if (listener_key.instance_of?(Proc))
            key = ProcWrapper.new(listener_key)
          end
          if (channel.has_key?(key))
            return channel.delete(key)
          end
          return nil
        end

        # Calls all the procs registered on the channel
        # indicated by channel_name. If value is
        # specified, it is passed in to the procs,
        # otherwise they are called with no arguments.
        #
        #--
        #
        # Perhaps this should be private? Would it ever
        # make sense for an external class to call this
        # method directly?
        def notify_listeners(channel_name, *arguments)
          channel = channels[channel_name]
          return 0 unless (channel)
          listeners = channel.values
          listeners.each { |listener| listener.call(*arguments) }
          return listeners.size
        end

        private
        def channels
          @channels ||= {}
          return @channels
        end
      end
    end
  end
end