Module: Sinatra::Reloader

Defined in:
lib/sinatra/reloader.rb

Overview

Sinatra::Reloader

Extension to reload modified files. Useful during development, since it will automatically require files defining routes, filters, error handlers and inline templates, with every incoming request, but only if they have been updated.

Usage

Classic Application

To enable the reloader in a classic application all you need to do is require it:

require "sinatra"
require "sinatra/reloader" if development?

# Your classic application code goes here...

Modular Application

To enable the reloader in a modular application all you need to do is require it, and then, register it:

require "sinatra/base"
require "sinatra/reloader"

class MyApp < Sinatra::Base
  configure :development do
    register Sinatra::Reloader
  end

  # Your modular application code goes here...
end

Using the Reloader in Other Environments

By default, the reloader is only enabled for the development environment. Similar to registering the reloader in a modular application, a classic application requires manually enabling the extension for it to be available in a non-development environment.

require "sinatra"
require "sinatra/reloader"

configure :production do
  enable :reloader
end

Changing the Reloading Policy

You can refine the reloading policy with also_reload and dont_reload, to customize which files should, and should not, be reloaded, respectively.

Classic Application

Simply call the methods:

require "sinatra"
require "sinatra/reloader" if development?

also_reload '/path/to/some/file'
dont_reload '/path/to/other/file'

# Your classic application code goes here...

Modular Application

Call the methods inside the configure block:

require "sinatra/base"
require "sinatra/reloader"

class MyApp < Sinatra::Base
  configure :development do
    register Sinatra::Reloader
    also_reload '/path/to/some/file'
    dont_reload '/path/to/other/file'
  end

  # Your modular application code goes here...
end

Defined Under Namespace

Modules: BaseMethods, ExtensionMethods Classes: Watcher

Class Method Summary collapse

Class Method Details

.perform(klass) ⇒ Object

Reloads the modified files, adding, updating and removing the needed elements.



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# File 'lib/sinatra/reloader.rb', line 233

def self.perform(klass)
  Watcher::List.for(klass).updated.each do |watcher|
    klass.set(:inline_templates, watcher.path) if watcher.inline_templates?
    watcher.elements.each { |element| klass.deactivate(element) }
    $LOADED_FEATURES.delete(watcher.path)
    require watcher.path
    watcher.update
  end
end

.registered(klass) ⇒ Object

When the extension is registered it extends the Sinatra application klass with the modules BaseMethods and ExtensionMethods and defines a before filter to perform the reload of the modified files.



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# File 'lib/sinatra/reloader.rb', line 209

def self.registered(klass)
  @reloader_loaded_in ||= {}
  return if @reloader_loaded_in[klass]

  @reloader_loaded_in[klass] = true

  klass.extend BaseMethods
  klass.extend ExtensionMethods
  klass.set(:reloader) { klass.development? }
  klass.set(:reload_templates) { klass.reloader? }
  klass.before do
    if klass.reloader?
      if Reloader.thread_safe?
        Thread.exclusive { Reloader.perform(klass) }
      else
        Reloader.perform(klass)
      end
    end
  end
  klass.set(:inline_templates, klass.app_file) if klass == Sinatra::Application
end

.thread_safe?Boolean

Indicates whether or not we can and need to run thread-safely.



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# File 'lib/sinatra/reloader.rb', line 244

def self.thread_safe?
  Thread and Thread.list.size > 1 and Thread.respond_to?(:exclusive)
end