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vendor/rails/activesupport/lib/active_support/cache/file_store.rb

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module ActiveSupport

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  module Cache

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    # A cache store implementation which stores everything on the filesystem.

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    class FileStore < Store

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      attr_reader :cache_path

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      def initialize(cache_path)

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        @cache_path = cache_path

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      end

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      def read(name, options = nil)

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        super

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        File.open(real_file_path(name), 'rb') { |f| Marshal.load(f) } rescue nil

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      end

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      def write(name, value, options = nil)

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        super

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        ensure_cache_path(File.dirname(real_file_path(name)))

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        File.atomic_write(real_file_path(name), cache_path) { |f| Marshal.dump(value, f) }

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        value

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      rescue => e

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        logger.error "Couldn't create cache directory: #{name} (#{e.message})" if logger

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      end

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      def delete(name, options = nil)

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        super

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        File.delete(real_file_path(name))

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      rescue SystemCallError => e

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        # If there's no cache, then there's nothing to complain about

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      end

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      def delete_matched(matcher, options = nil)

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        super

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        search_dir(@cache_path) do |f|

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          if f =~ matcher

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            begin

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              File.delete(f)

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            rescue SystemCallError => e

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              # If there's no cache, then there's nothing to complain about

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            end

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          end

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        end

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      end

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      def exist?(name, options = nil)

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        super

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        File.exist?(real_file_path(name))

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      end

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      private

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        def real_file_path(name)

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          '%s/%s.cache' % [@cache_path, name.gsub('?', '.').gsub(':', '.')]

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        end

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        def ensure_cache_path(path)

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          FileUtils.makedirs(path) unless File.exist?(path)

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        end

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        def search_dir(dir, &callback)

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          Dir.foreach(dir) do |d|

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            next if d == "." || d == ".."

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            name = File.join(dir, d)

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            if File.directory?(name)

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              search_dir(name, &callback)

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            else

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              callback.call name

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            end

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          end

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        end

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    end

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  end

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end

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