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Active Support 重新加载器

此类定义了几个回调

to_prepare -- Run once at application startup, and also from
+to_run+.

to_run -- Run before a work run that is reloading. If
+reload_classes_only_on_change+ is true (the default), the class
unload will have already occurred.

to_complete -- Run after a work run that has reloaded. If
+reload_classes_only_on_change+ is false, the class unload will
have occurred after the work run, but before this callback.

before_class_unload -- Run immediately before the classes are
unloaded.

after_class_unload -- Run immediately after the classes are
unloaded.
方法
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B
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类公共方法

after_class_unload(*args, &block)

注册一个回调，它将在类卸载后立即运行。

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 44
def self.after_class_unload(*args, &block)
  set_callback(:class_unload, :after, *args, &block)
end

before_class_unload(*args, &block)

注册一个回调，它将在类卸载前立即运行。

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 39
def self.before_class_unload(*args, &block)
  set_callback(:class_unload, *args, &block)
end

new()

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 99
def initialize
  super
  @locked = false
end

reload!()

启动手动重新加载

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 51
def self.reload!
  executor.wrap do
    new.tap do |instance|
      instance.run!
    ensure
      instance.complete!
    end
  end
  prepare!
end

to_prepare(*args, &block)

注册一个回调，它将在应用程序启动时以及每次代码重新加载时运行一次。

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 34
def self.to_prepare(*args, &block)
  set_callback(:prepare, *args, &block)
end

wrap(**kwargs)

运行提供的块作为工作单元，根据需要重新加载代码

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 71
def self.wrap(**kwargs)
  return yield if active?

  executor.wrap(**kwargs) do
    instance = run!
    begin
      yield
    ensure
      instance.complete!
    end
  end
end

实例公共方法

release_unload_lock!()

如果之前已获得卸载锁，则释放它

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 114
def release_unload_lock!
  if @locked
    @locked = false
    ActiveSupport::Dependencies.interlock.done_unloading
  end
end

require_unload_lock!()

获取 ActiveSupport::Dependencies::Interlock 卸载锁，确保它将自动释放

来源: 显示 | 在GitHub上

# File activesupport/lib/active_support/reloader.rb, line 106
def require_unload_lock!
  unless @locked
    ActiveSupport::Dependencies.interlock.start_unloading
    @locked = true
  end
end