gistfile1.txt

module ActsAsCached
  class LocalCache
    delegate :respond_to?, :to => :@remote_cache
        
    def initialize(remote_cache)
      @remote_cache = remote_cache
    end

    def cache_locally
      @remote_cache = LocalCacheBuffer.new(original_cache = @remote_cache)
      yield
    ensure
      @remote_cache = original_cache
    end
    
    def method_missing(method, *args, &block)
      @remote_cache.send(method, *args, &block)
    end
  end
  
  class LocalCacheBuffer
    delegate :respond_to?, :to => :@remote_cache
    
    def initialize(remote_cache)
      @local_cache = {}
      @remote_cache = remote_cache
    end
  
    def get(key, *options)
      if @local_cache.has_key?(key)
        @local_cache[key]
      else
        @local_cache[key] = @remote_cache.get(key, *options)
      end
    end
    
    def set(key, value, *options)
      @remote_cache.set(key, value, *options)
      @local_cache[key] = value
    end
    
    def add(key, value, *options)
      result = @remote_cache.add(key, value, *options)
      if result == "STORED\r\n"
        @local_cache[key] = value
      end
      result
    end
    
    def delete(key, *options)
      @remote_cache.delete(key, *options)
      @local_cache.delete(key)
    end
    
    def method_missing(method, *args, &block)
      @remote_cache.send(method, *args, &block)
    end
  end
end