method

add_listener

v1_8_6_287 - Show latest stable - 0 notes - Class: Test::Unit::Util::Observable

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What's this?

add_listener(channel_name, listener_key=NOTHING) public

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)

Show source

# File lib/test/unit/util/observable.rb, line 31
        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

add_listener

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