performance - Symfony2 依赖注入(inject) : performances impact

Question

我正在重构我的一个 Controller 以使其成为一项服务，我想知道不将整个服务容器注入(inject)我的 Controller 是否会对性能产生影响。

这样效率更高吗:

innova.path.controller:
    class: %innova.controller.path.class%
    arguments:
       entityManager:   @doctrine.orm.entity_manager
       session:         @session
       securityContext: @security.context
       router:          @router
       translator:      @translator
       pathManager:     @innova.manager.path_manager
    calls:
       - [setRequest, ["@?request="]]
    scope: request

比这个，例如？

innova.path.controller:
    class: %innova.controller.path.class%
    arguments: [@service_container]

Answer 1

官方文档明确告诉不要将整个 DIC 注入(inject) Controller (感谢@NHG 提供链接)。

第How to work with scopes :

Injecting the whole container into a service is generally not a good idea (only inject what you need).

但在 Service container 部分:

When you ask for the my_mailer service from the container, the container constructs the object and returns it. This is another major advantage of using the service container. Namely, a service is never constructed until it's needed. If you define a service and never use it on a request, the service is never created. This saves memory and increases the speed of your application. This also means that there's very little or no performance hit for defining lots of services. Services that are never used are never constructed.

因此将整个 DIC 注入(inject) Controller 不会对性能产生影响，因为只有 Controller 中使用的服务被实例化。