Class: Spring::Application

Inherits:
Object
  • Object
show all
Defined in:
lib/spring/application.rb

Constant Summary collapse

WATCH_INTERVAL = 
0.2

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(manager, watcher = Spring.application_watcher) ⇒ Application

Returns a new instance of Application.



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# File 'lib/spring/application.rb', line 18

def initialize(manager, watcher = Spring.application_watcher)
  @manager = manager
  @watcher = watcher
  @setup   = Set.new
end

Instance Attribute Details

#manager ⇒ Object (readonly)

Returns the value of attribute manager.



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# File 'lib/spring/application.rb', line 16

def manager
  @manager
end

#watcher ⇒ Object (readonly)

Returns the value of attribute watcher.



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# File 'lib/spring/application.rb', line 16

def watcher
  @watcher
end

Instance Method Details

#invoke_after_fork_callbacks ⇒ Object 



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# File 'lib/spring/application.rb', line 108

def invoke_after_fork_callbacks
  Spring.after_fork_callbacks.each do |callback|
    callback.call
  end
end

#run ⇒ Object 



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# File 'lib/spring/application.rb', line 43

def run
  loop do
    watch_application
    serve manager.recv_io(UNIXSocket)
  end
end

#serve(client) ⇒ Object 



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# File 'lib/spring/application.rb', line 56

def serve(client)
  streams     = 3.times.map { client.recv_io }
  args_length = client.gets.to_i
  args        = args_length.times.map { client.read(client.gets.to_i) }
  command     = Spring.command(args.shift)

  setup command

  ActionDispatch::Reloader.cleanup!
  ActionDispatch::Reloader.prepare!

  pid = fork {
    Process.setsid
    [STDOUT, STDERR, STDIN].zip(streams).each { |a, b| a.reopen(b) }
    IGNORE_SIGNALS.each { |sig| trap(sig, "DEFAULT") }
    invoke_after_fork_callbacks
    command.call(args)
  }

  manager.puts pid

  # Wait in a separate thread so we can run multiple commands at once
  Thread.new {
    _, status = Process.wait2 pid
    streams.each(&:close)
    client.puts(status.exitstatus)
    client.close
  }

rescue => e
  streams.each(&:close) if streams
  client.puts(1)
  client.close
  raise
end

#setup(command) ⇒ Object

The command might need to require some files in the main process so that they are cached. For example a test command wants to load the helper file once and have it cached.

FIXME: The watcher.add_files will reset the watcher, which may mean that previous changes to already-loaded files are missed.



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# File 'lib/spring/application.rb', line 98

def setup(command)
  return if @setup.include?(command.class)
  @setup << command.class

  if command.respond_to?(:setup)
    command.setup
    watcher.add_files $LOADED_FEATURES # loaded features may have changed
  end
end

#start ⇒ Object 



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# File 'lib/spring/application.rb', line 24

def start
  require Spring.application_root_path.join("config", "application")

  # The test environment has config.cache_classes = true set by default.
  # However, we don't want this to prevent us from performing class reloading,
  # so this gets around that.
  Rails::Application.initializer :initialize_dependency_mechanism, group: :all do
    ActiveSupport::Dependencies.mechanism = :load
  end

  require Spring.application_root_path.join("config", "environment")

  watcher.add_files $LOADED_FEATURES
  watcher.add_files ["Gemfile", "Gemfile.lock"].map { |f| "#{Rails.root}/#{f}" }
  watcher.add_globs Rails.application.paths["config/initializers"].map { |p| "#{Rails.root}/#{p}/*.rb" }

  run
end

#watch_application ⇒ Object 



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# File 'lib/spring/application.rb', line 50

def watch_application
  until IO.select([manager], [], [], WATCH_INTERVAL)
    exit if watcher.stale?
  end
end