response caching in camping

remvee (Remco van 't Veer) — Wed, 16 Jan 2008 13:27:23 GMT

A basic implementation of response caching in camping.



Camping.goes :MyCampingApp



module MyCampingApp

  module Controller

    class View < R '/'

      def get

        cache('root') do

          'Expensive operation!'

        end

      end

    end

  end

  

  def flush(id)

    f = File.dirname(__FILE__) + "/cache/#{id}"

    File.delete(f) if File.exists?(f)

  end

  

  def cache(id, timeout = 1.hour)

    f = File.dirname(__FILE__) + "/cache/#{id}"

    

    if File.exists?(f) && (Time.now - File.stat(f).mtime) < timeout

      File.read(f)

    else

      r = yield

      open(f, 'w'){|wr| wr.write(r)}

      r

    end

  end



  def self.create

    cache_dir = File.dirname(__FILE__) + "/cache"

    Dir.mkdir(cache_dir) unless File.directory?(cache_dir)

  end

end

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response caching in camping