moneta-memcached.rb

begin
  require "memcached"
rescue LoadError
  puts "You need the memcached (the libmemcached client, not the other one) gem to use the Memcached moneta store"
  exit
end

# uses the memcached gem properly, and traps the weirdass exception a get on an undefined key throws. May be worth changing
# further to allow the extra flags memcached lets you use, like marshal => true|false or the various memcached flags

module Moneta
  class MemCached
    include Defaults

    def initialize(options = {})
      @cache = Memcached.new(options.delete(:server), options)
    end

    def key?(key)
      !self[key].nil?
    end

    alias has_key? key?

    def [](key)
        begin
                val = @cache.get(key)
        rescue
                val = nil
        end
        return val
    end

    def []=(key, value)
      store(key, value)
    end

    def delete(key)
      value = self[key]
      @cache.delete(key) if value
      value
    end

    def store(key, value, options = {})
      args = [key, value, options[:expires_in]].compact
      @cache.set(*args)
    end

    def update_key(key, options = {})
      val = self[key]
      self.store(key, val, options)
    end

    def clear
      @cache.flush_all
    end
  end
end