Contents

require 'delegate'

module ActiveRemote::Cached
  class Cache < ::SimpleDelegator
    attr_reader :cache_provider

    def initialize(new_cache_provider)
      @cache_provider = new_cache_provider
      validate_provider_method_present(:delete)
      validate_provider_method_present(:exist?)
      validate_provider_method_present(:fetch)
      validate_provider_method_present(:read)
      validate_provider_method_present(:write)
      
      super(@cache_provider)
    end

    def fetch(name, options = {})
      fetch_value = super

      unless valid_fetched_value?(fetch_value, options)
        delete(name)
      end

      return fetch_value
    end

    private

    def valid_fetched_value?(value, options = {})
      return false if value.nil?
      return false if !options.fetch(:allow_empty, false) && value.respond_to?(:empty?) && value.empty?
      return true
    end

    def validate_provider_method_present(method_name)
      unless self.cache_provider.respond_to?(method_name)
        raise <<-CACHE_METHOD
          ActiveRemote::Cached::Cache must respond_to? #{method_name}
          in order to be used as a caching interface for ActiveRemote
        CACHE_METHOD
      end
    end
      
  end
end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
active_remote-cached-0.0.9	lib/active_remote/cached/cache.rb
active_remote-cached-0.0.8	lib/active_remote/cached/cache.rb
active_remote-cached-0.0.7	lib/active_remote/cached/cache.rb
active_remote-cached-0.0.6	lib/active_remote/cached/cache.rb
active_remote-cached-0.0.5	lib/active_remote-cached/cache.rb