Class-level accessors in Ruby

While looking at the source code for Capistrano today, I came across a nice idiom for making class-level accessors:

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class Actor class << self attr_accessor :connection_factory attr_accessor :command_factory attr_accessor :transfer_factory attr_accessor :default_io_proc end self.connection_factory = DefaultConnectionFactory self.command_factory = Command self.transfer_factory = Transfer end

Now you can use these class-level accessors:

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Actor.connection_factory Actor.command_factory ...

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