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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 Base.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):
#
# ActionController::Base.cache_store = :memory_store
# ActionController::Base.cache_store = :file_store, "/path/to/cache/directory"
# ActionController::Base.cache_store = :drb_store, "druby://localhost:9192"
# ActionController::Base.cache_store = :mem_cache_store, "localhost"
# ActionController::Base.cache_store = MyOwnStore.new("parameter")
module Caching
extend ActiveSupport::DependencyModule
autoload :Actions, 'action_controller/caching/actions'
autoload :Fragments, 'action_controller/caching/fragments'
autoload :Pages, 'action_controller/caching/pages'
autoload :Sweeper, 'action_controller/caching/sweeping'
autoload :Sweeping, 'action_controller/caching/sweeping'
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
def self.cache_configured?
perform_caching && cache_store
end
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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