vendor/rails/actionpack/lib/action_controller/vendor/rack-1.0/rack/reloader.rb

   1 require 'thread'
   2
   3 module Rack
   4   # Rack::Reloader checks on every request, but at most every +secs+
   5   # seconds, if a file loaded changed, and reloads it, logging to
   6   # rack.errors.
   7   #
   8   # It is recommended you use ShowExceptions to catch SyntaxErrors etc.
   9
  10   class Reloader
  11     def initialize(app, secs=10)
  12       @app = app
  13       @secs = secs              # reload every @secs seconds max
  14       @last = Time.now
  15     end
  16
  17     def call(env)
  18       if Time.now > @last + @secs
  19         Thread.exclusive {
  20           reload!(env['rack.errors'])
  21           @last = Time.now
  22         }
  23       end
  24
  25       @app.call(env)
  26     end
  27
  28     def reload!(stderr=$stderr)
  29       need_reload = $LOADED_FEATURES.find_all { |loaded|
  30         begin
  31           if loaded =~ /\A[.\/]/  # absolute filename or 1.9
  32             abs = loaded
  33           else
  34             abs = $LOAD_PATH.map { |path| ::File.join(path, loaded) }.
  35                              find { |file| ::File.exist? file }
  36           end
  37
  38           if abs
  39             ::File.mtime(abs) > @last - @secs  rescue false
  40           else
  41             false
  42           end
  43         end
  44       }
  45
  46       need_reload.each { |l|
  47         $LOADED_FEATURES.delete l
  48       }
  49
  50       need_reload.each { |to_load|
  51         begin
  52           if require to_load
  53             stderr.puts "#{self.class}: reloaded `#{to_load}'"
  54           end
  55         rescue LoadError, SyntaxError => e
  56           raise e                 # Possibly ShowExceptions
  57         end
  58       }
  59
  60       stderr.flush
  61       need_reload
  62     end
  63   end
  64 end