new

# File activesupport/lib/active_support/callbacks.rb, line 361
      def initialize(name, filter, kind, options, chain_config)
        @chain_config  = chain_config
        @name    = name
        @kind    = kind
        @filter  = filter
        @key     = compute_identifier filter
        @if      = Array(options[:if])
        @unless  = Array(options[:unless])
      end