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require 'fileutils'
require 'uri'
require 'set'
module ActionController #:nodoc:
# Caching is a cheap way of speeding up slow applications by keeping the result of
# calculations, renderings, and database calls around for subsequent requests.
# Action Controller affords you three approaches in varying levels of granularity:
# Page, Action, Fragment.
#
# You can read more about each approach and the sweeping assistance by clicking the
# modules below.
#
# Note: To turn off all caching and sweeping, set
# config.action_controller.perform_caching = false.
#
# == Caching stores
#
# All the caching stores from ActiveSupport::Cache are available to be used as backends
# for Action Controller caching. This setting only affects action and fragment caching
# as page caching is always written to disk.
#
# Configuration examples (MemoryStore is the default):
#
# config.action_controller.cache_store = :memory_store
# config.action_controller.cache_store = :file_store, "/path/to/cache/directory"
# config.action_controller.cache_store = :drb_store, "druby://localhost:9192"
# config.action_controller.cache_store = :mem_cache_store, "localhost"
# config.action_controller.cache_store = :mem_cache_store, Memcached::Rails.new("localhost:11211")
# config.action_controller.cache_store = MyOwnStore.new("parameter")
module Caching
extend ActiveSupport::Concern
extend ActiveSupport::Autoload
eager_autoload do
autoload :Actions
autoload :Fragments
autoload :Pages
autoload :Sweeper, 'action_controller/caching/sweeping'
autoload :Sweeping, 'action_controller/caching/sweeping'
end
included do
@@cache_store = nil
cattr_reader :cache_store
# Defines the storage option for cached fragments
def self.cache_store=(store_option)
@@cache_store = ActiveSupport::Cache.lookup_store(store_option)
end
include Pages, Actions, Fragments
include Sweeping if defined?(ActiveRecord)
@@perform_caching = true
cattr_accessor :perform_caching
end
module ClassMethods
def cache_configured?
perform_caching && cache_store
end
def log_event(name, before, after, instrumenter_id, payload)
if name.to_s =~ /(read|write|cache|expire|exist)_(fragment|page)\??/
key_or_path = payload[:key] || payload[:path]
human_name = name.to_s.humanize
duration = (after - before) * 1000
logger.info("#{human_name} #{key_or_path.inspect} (%.1fms)" % duration)
else
super
end
end
end
def caching_allowed?
request.get? && response.status == 200
end
protected
# Convenience accessor
def cache(key, options = {}, &block)
if cache_configured?
cache_store.fetch(ActiveSupport::Cache.expand_cache_key(key, :controller), options, &block)
else
yield
end
end
private
def cache_configured?
self.class.cache_configured?
end
end
end
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