module Coolio::Meta

Public Instance Methods

event_callback(*methods) click to toggle source

Define callbacks whose behavior can be changed on-the-fly per instance. This is done by giving a block to the callback method, which is captured as a proc and stored for later. If the method is called without a block, the stored block is executed if present, otherwise it's a noop.

# File lib/cool.io/meta.rb, line 32
def event_callback(*methods)
  methods.each do |method|
    module_eval <<-EOD
      def #{method}(*args, &block)
        if block
          @#{method}_callback = block
          return
        end

        if defined? @#{method}_callback and @#{method}_callback
          instance_exec(*args, &@#{method}_callback)
        end
      end
    EOD
  end
end
watcher_delegate(proxy_var) click to toggle source

Use an alternate watcher with the attach/detach/enable/disable methods if it is presently assigned. This is useful if you are waiting for an event to occur before the current watcher can be used in earnest, such as making an outgoing TCP connection.

# File lib/cool.io/meta.rb, line 13
def watcher_delegate(proxy_var)
  %w{attach attached? detach enable disable}.each do |method|
    module_eval <<-EOD
      def #{method}(*args)
        if defined? #{proxy_var} and #{proxy_var}
          #{proxy_var}.#{method}(*args)
          return self
        end

        super
      end
    EOD
  end
end