Rack::Reloader

# File lib/rack/reloader.rb, line 23
def initialize(app, cooldown = 10, backend = Stat)
  @app = app
  @cooldown = cooldown
  @last = (Time.now - cooldown)
  @cache = {}
  @mtimes = {}

  extend backend
end

# File lib/rack/reloader.rb, line 33
def call(env)
  if @cooldown and Time.now > @last + @cooldown
    if Thread.list.size > 1
      Thread.exclusive{ reload! }
    else
      reload!
    end

    @last = Time.now
  end

  @app.call(env)
end

# File lib/rack/reloader.rb, line 47
def reload!(stderr = $stderr)
  rotation do |file, mtime|
    previous_mtime = @mtimes[file] ||= mtime
    safe_load(file, mtime, stderr) if mtime > previous_mtime
  end
end

# File lib/rack/reloader.rb, line 55
def safe_load(file, mtime, stderr = $stderr)
  load(file)
  stderr.puts "#{self.class}: reloaded `#{file}'"
  file
rescue LoadError, SyntaxError => ex
  stderr.puts ex
ensure
  @mtimes[file] = mtime
end