Class: Rack::Reloader

Inherits:
Object show all
Defined in:
lib/gems/rack-0.9.1/lib/rack/reloader.rb

Overview

Rack::Reloader checks on every request, but at most every secs seconds, if a file loaded changed, and reloads it, logging to rack.errors.

It is recommended you use ShowExceptions to catch SyntaxErrors etc.

Instance Method Summary collapse

Constructor Details

#initialize(app, secs = 10) ⇒ Reloader

Returns a new instance of Reloader.



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# File 'lib/gems/rack-0.9.1/lib/rack/reloader.rb', line 11

def initialize(app, secs=10)
  @app = app
  @secs = secs              # reload every @secs seconds max
  @last = Time.now
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/gems/rack-0.9.1/lib/rack/reloader.rb', line 17

def call(env)
  if Time.now > @last + @secs
    Thread.exclusive {
      reload!(env['rack.errors'])
      @last = Time.now
    }
  end

  @app.call(env)
end

#reload!(stderr = STDERR) ⇒ Object 



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# File 'lib/gems/rack-0.9.1/lib/rack/reloader.rb', line 28

def reload!(stderr=STDERR)
  need_reload = $LOADED_FEATURES.find_all { |loaded|
    begin
      if loaded =~ /\A[.\/]/  # absolute filename or 1.9
        abs = loaded
      else
        abs = $LOAD_PATH.map { |path| ::File.join(path, loaded) }.
                         find { |file| ::File.exist? file }
      end

      if abs
        ::File.mtime(abs) > @last - @secs  rescue false
      else
        false
      end
    end
  }

  need_reload.each { |l|
    $LOADED_FEATURES.delete l
  }

  need_reload.each { |to_load|
    begin
      if require to_load
        stderr.puts "#{self.class}: reloaded `#{to_load}'"
      end
    rescue LoadError, SyntaxError => e
      raise e                 # Possibly ShowExceptions
    end
  }

  stderr.flush
  need_reload
end