Moved the caching stores from ActionController::Caching::Fragments::* to ActiveSupport::Cache::*. If you're explicitly referring to a store, like ActionController::Caching::Fragments::MemoryStore, you need to update that reference with ActiveSupport::Cache::MemoryStore [DHH] Deprecated ActionController::Base.fragment_cache_store for ActionController::Base.cache_store [DHH] All fragment cache keys are now by default prefixed with the 'views/' namespace [DHH] Added ActiveRecord::Base.cache_key to make it easier to cache Active Records in combination with the new ActiveSupport::Cache::* libraries [DHH] Added ActiveSupport::Gzip.decompress/compress(source) as an easy wrapper for Zlib [Tobias Luetke] Included MemCache-Client to make the improved ActiveSupport::Cache::MemCacheStore work out of the box [Bob Cottrell, Eric Hodel] Added config.cache_store to environment options to control the default cache store (default is FileStore if tmp/cache is present, otherwise MemoryStore is used) [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8546 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 141 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/caching/pages.rb b/actionpack/lib/action_controller/caching/pages.rb
new file mode 100644
index 0000000000..4307f39583
--- /dev/null
+++ b/actionpack/lib/action_controller/caching/pages.rb
@@ -0,0 +1,141 @@
+require 'fileutils'
+require 'uri'
+
+module ActionController #:nodoc:
+  module Caching
+    # Page caching is an approach to caching where the entire action output of is stored as a HTML file that the web server
+    # can serve without going through the Action Pack. This can be as much as 100 times faster than going through the process of dynamically
+    # generating the content. Unfortunately, this incredible speed-up is only available to stateless pages where all visitors
+    # are treated the same. Content management systems -- including weblogs and wikis -- have many pages that are a great fit
+    # for this approach, but account-based systems where people log in and manipulate their own data are often less likely candidates.
+    #
+    # Specifying which actions to cache is done through the <tt>caches</tt> class method:
+    #
+    #   class WeblogController < ActionController::Base
+    #     caches_page :show, :new
+    #   end
+    #
+    # This will generate cache files such as weblog/show/5 and weblog/new, which match the URLs used to trigger the dynamic
+    # generation. This is how the web server is able pick up a cache file when it exists and otherwise let the request pass on to
+    # the Action Pack to generate it.
+    #
+    # Expiration of the cache is handled by deleting the cached file, which results in a lazy regeneration approach where the cache
+    # is not restored before another hit is made against it. The API for doing so mimics the options from url_for and friends:
+    #
+    #   class WeblogController < ActionController::Base
+    #     def update
+    #       List.update(params[:list][:id], params[:list])
+    #       expire_page :action => "show", :id => params[:list][:id]
+    #       redirect_to :action => "show", :id => params[:list][:id]
+    #     end
+    #   end
+    #
+    # Additionally, you can expire caches using Sweepers that act on changes in the model to determine when a cache is supposed to be
+    # expired.
+    #
+    # == Setting the cache directory
+    #
+    # The cache directory should be the document root for the web server and is set using Base.page_cache_directory = "/document/root".
+    # For Rails, this directory has already been set to RAILS_ROOT + "/public".
+    #
+    # == Setting the cache extension
+    #
+    # By default, the cache extension is .html, which makes it easy for the cached files to be picked up by the web server. If you want
+    # something else, like .php or .shtml, just set Base.page_cache_extension.
+    module Pages
+      def self.included(base) #:nodoc:
+        base.extend(ClassMethods)
+        base.class_eval do
+          @@page_cache_directory = defined?(RAILS_ROOT) ? "#{RAILS_ROOT}/public" : ""
+          cattr_accessor :page_cache_directory
+
+          @@page_cache_extension = '.html'
+          cattr_accessor :page_cache_extension
+        end
+      end
+
+      module ClassMethods
+        # Expires the page that was cached with the +path+ as a key. Example:
+        #   expire_page "/lists/show"
+        def expire_page(path)
+          return unless perform_caching
+
+          benchmark "Expired page: #{page_cache_file(path)}" do
+            File.delete(page_cache_path(path)) if File.exist?(page_cache_path(path))
+          end
+        end
+
+        # Manually cache the +content+ in the key determined by +path+. Example:
+        #   cache_page "I'm the cached content", "/lists/show"
+        def cache_page(content, path)
+          return unless perform_caching
+
+          benchmark "Cached page: #{page_cache_file(path)}" do
+            FileUtils.makedirs(File.dirname(page_cache_path(path)))
+            File.open(page_cache_path(path), "wb+") { |f| f.write(content) }
+          end
+        end
+
+        # Caches the +actions+ using the page-caching approach that'll store the cache in a path within the page_cache_directory that
+        # matches the triggering url.
+        def caches_page(*actions)
+          return unless perform_caching
+          actions = actions.map(&:to_s)
+          after_filter { |c| c.cache_page if actions.include?(c.action_name) }
+        end
+
+        private
+          def page_cache_file(path)
+            name = (path.empty? || path == "/") ? "/index" : URI.unescape(path.chomp('/'))
+            name << page_cache_extension unless (name.split('/').last || name).include? '.'
+            return name
+          end
+
+          def page_cache_path(path)
+            page_cache_directory + page_cache_file(path)
+          end
+      end
+
+      # Expires the page that was cached with the +options+ as a key. Example:
+      #   expire_page :controller => "lists", :action => "show"
+      def expire_page(options = {})
+        return unless perform_caching
+
+        if options.is_a?(Hash)
+          if options[:action].is_a?(Array)
+            options[:action].dup.each do |action|
+              self.class.expire_page(url_for(options.merge(:only_path => true, :skip_relative_url_root => true, :action => action)))
+            end
+          else
+            self.class.expire_page(url_for(options.merge(:only_path => true, :skip_relative_url_root => true)))
+          end
+        else
+          self.class.expire_page(options)
+        end
+      end
+
+      # Manually cache the +content+ in the key determined by +options+. If no content is provided, the contents of response.body is used
+      # If no options are provided, the requested url is used. Example:
+      #   cache_page "I'm the cached content", :controller => "lists", :action => "show"
+      def cache_page(content = nil, options = nil)
+        return unless perform_caching && caching_allowed
+
+        path = case options
+          when Hash
+            url_for(options.merge(:only_path => true, :skip_relative_url_root => true, :format => params[:format]))
+          when String
+            options
+          else
+            request.path
+        end
+
+        self.class.cache_page(content || response.body, path)
+      end
+
+      private
+        def caching_allowed
+          request.get? && response.headers['Status'].to_i == 200
+        end
+    end
+  end
+end
\ No newline at end of file