跳至内容 跳至搜索

Active Support 自动加载

Autoload 以及为您的库提供的预加载便利功能。

此模块允许您根据 Rails 约定定义自动加载(即无需定义路径,它会根据文件名自动猜测),还可以定义一组需要预加载的常量。

module MyLib
  extend ActiveSupport::Autoload

  autoload :Model

  eager_autoload do
    autoload :Cache
  end
end

然后,您的库可以通过简单地调用以下命令进行预加载:

MyLib.eager_load!
方法
A
E

实例公共方法

autoload(const_name, path = @_at_path)

# File activesupport/lib/active_support/dependencies/autoload.rb, line 30
def autoload(const_name, path = @_at_path)
  unless path
    full = [name, @_under_path, const_name.to_s].compact.join("::")
    path = Inflector.underscore(full)
  end

  if @_eager_autoload
    @_eagerloaded_constants ||= []
    @_eagerloaded_constants << const_name
  end

  super const_name, path
end

autoload_at(path)

# File activesupport/lib/active_support/dependencies/autoload.rb, line 51
def autoload_at(path)
  @_at_path, old_path = path, @_at_path
  yield
ensure
  @_at_path = old_path
end

autoload_under(path)

# File activesupport/lib/active_support/dependencies/autoload.rb, line 44
def autoload_under(path)
  @_under_path, old_path = path, @_under_path
  yield
ensure
  @_under_path = old_path
end

eager_autoload()

# File activesupport/lib/active_support/dependencies/autoload.rb, line 58
def eager_autoload
  old_eager, @_eager_autoload = @_eager_autoload, true
  yield
ensure
  @_eager_autoload = old_eager
end

eager_load!()

# File activesupport/lib/active_support/dependencies/autoload.rb, line 65
def eager_load!
  if @_eagerloaded_constants
    @_eagerloaded_constants.each { |const_name| const_get(const_name) }
    @_eagerloaded_constants = nil
  end
end