Rails源代码分析（17）：ActionController::Caching(1)

1 框架Cache可以很方便的来加速应用，可以在计算、rendering以及数据库调用ActionController有3种方式的cache：Page, Action, FragmentTo turn off all caching and sweeping, set Base.perform_caching = false.Configuration examples (MemoryStore

jlaky

386人浏览 · 2008-11-28 12:39:00

jlaky · 2008-11-28 12:39:00 发布

1 框架

Cache可以很方便的来加速应用，可以在计算、rendering以及数据库调用

ActionController有3种方式的cache：

Page, Action, Fragment

To turn off all caching and sweeping, set Base.perform_caching = false.

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
    def self.included(base) #:nodoc:
      base.class_eval 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, SqlCache if defined?(ActiveRecord)
        @@perform_caching = true
        cattr_accessor :perform_caching
        # 是否配置了cache，取决于 perform_caching 和 cache_store 设置了
       def self.cache_configured?
          perform_caching && cache_store
        end
      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
 
   