Spawning of Rails 1 and Rails 2 applications.
ClassicRails::ApplicationSpawner can operate in two modes:
Smart mode. In this mode, the Rails application's code is first preloaded into a temporary process, which can then further fork off application processes. Once the code has been preloaded, forking off application processes is very fast, and all the forked off application processes can share code memory with each other. To use this mode, create an ApplicationSpawner object, start it, and call spawn_application on it. A single ApplicationSpawner object can only handle a single Rails application.
Conservative mode. In this mode, a Rails app process is directly spawned without any preloading. This increases compatibility with applications. To use this mode, call ::spawn_application.
The application root of this spawner.
The following options are accepted:
See PhusionPassenger::SpawnManager#spawn_application for information about the options.
# File lib/phusion_passenger/classic_rails/application_spawner.rb, line 116 def initialize(options) super() @options = sanitize_spawn_options(options) @app_root = @options["app_root"] @canonicalized_app_root = canonicalize_path(@app_root) self.max_idle_time = DEFAULT_APP_SPAWNER_MAX_IDLE_TIME define_message_handler(:spawn_application, :handle_spawn_application) end
Spawns an instance of a Rails application. When successful, an AppProcess object will be returned, which represents the spawned Rails application.
This method spawns the application directly, without preloading its code. This method may only be called if no Rails framework has been loaded in the current Ruby VM.
The "#app_root" option must be given. All other options are passed to the request handler's constructor.
Raises:
AppInitError: The Ruby on Rails application raised an exception or called exit() during startup.
SystemCallError, IOError, SocketError: Something went wrong.
# File lib/phusion_passenger/classic_rails/application_spawner.rb, line 80 def self.spawn_application(options) options = sanitize_spawn_options(options) a, b = UNIXSocket.pair pid = safe_fork('application', true) do a.close file_descriptors_to_leave_open = [0, 1, 2, b.fileno] NativeSupport.close_all_file_descriptors(file_descriptors_to_leave_open) close_all_io_objects_for_fds(file_descriptors_to_leave_open) channel = MessageChannel.new(b) success = report_app_init_status(channel) do prepare_app_process('config/environment.rb', options) require File.expand_path('config/environment') require 'dispatcher' after_loading_app_code(options) end if success start_request_handler(channel, false, options) end end b.close Process.waitpid(pid) rescue nil channel = MessageChannel.new(a) unmarshal_and_raise_errors(channel, options["print_exceptions"]) # No exception was raised, so spawning succeeded. return AppProcess.read_from_channel(channel) end
Spawns an instance of the Rails application. When successful, an AppProcess object will be returned, which represents the spawned Rails application.
options
will be passed to the request handler's constructor.
Raises:
AbstractServer::ServerNotStarted: The ApplicationSpawner server hasn't already been started.
ApplicationSpawner::Error: The ApplicationSpawner server exited unexpectedly.
# File lib/phusion_passenger/classic_rails/application_spawner.rb, line 133 def spawn_application(options = {}) connect do |channel| channel.write("spawn_application", *options.to_a.flatten) return AppProcess.read_from_channel(channel) end rescue SystemCallError, IOError, SocketError => e raise Error, "The application spawner server exited unexpectedly: #{e}" end
Overrided from PhusionPassenger::AbstractServer#start.
May raise these additional exceptions:
AppInitError: The Ruby on Rails application raised an exception or called exit() during startup.
ApplicationSpawner::Error: The ApplicationSpawner server exited unexpectedly.
# File lib/phusion_passenger/classic_rails/application_spawner.rb, line 148 def start super begin channel = MessageChannel.new(@owner_socket) unmarshal_and_raise_errors(channel, @options["print_exceptions"]) rescue IOError, SystemCallError, SocketError => e stop if started? raise Error, "The application spawner server exited unexpectedly: #{e}" rescue stop if started? raise end end