Contents

require 'singleton'

module InfoparkComponentCache
  # @author Tomasz Przedmojski <[e-mail]>
  #
  # This abstract base class represents a very thin wrapper
  # around the underlying cache storage.
  #
  # @note Any valid implementation *must* respect
  #   Rails.application.config.action_controller.perform_caching
  #   setting.
  class AbstractCacheStorage
    include Singleton

    def exist?(key)
      enabled? && backing_storage.exist?(key)
    end

    def read(key)
      # it is possible to read disabled cache!
      backing_storage.read(key) 
    end

    def write(key, value, options={})
      backing_storage.write(key, value, options) if enabled?
    rescue Errno::ENOSPC => e
      Rails.logger.error("Unable to write cache, cache full: #{e.message}")
    end

    # @private
    def enabled?
      Rails.application.config.action_controller.perform_caching
    end

    protected
    def backing_storage
      raise TypeError, "Cannot use abstract cache storage. Please provide a concrete cache storage in #{self.class.name}"
    end
  end
end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
infopark_component_cache-3.2.0	lib/infopark_component_cache/abstract_cache_storage.rb
infopark_component_cache-3.1.1	lib/infopark_component_cache/abstract_cache_storage.rb
infopark_component_cache-3.1.0	lib/infopark_component_cache/abstract_cache_storage.rb
infopark_component_cache-3.0.0	lib/infopark_component_cache/abstract_cache_storage.rb
infopark_component_cache-2.0.0	lib/infopark_component_cache/abstract_cache_storage.rb