diff options
Diffstat (limited to 'ruby_1_8_5/lib/test/unit/util/observable.rb')
-rw-r--r-- | ruby_1_8_5/lib/test/unit/util/observable.rb | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/ruby_1_8_5/lib/test/unit/util/observable.rb b/ruby_1_8_5/lib/test/unit/util/observable.rb deleted file mode 100644 index 3567d34271..0000000000 --- a/ruby_1_8_5/lib/test/unit/util/observable.rb +++ /dev/null @@ -1,90 +0,0 @@ -#-- -# -# 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 |