Symfony2 当听众比服务更可取时? [英] Symfony2 when listeners are preferable than services?

问题描述

我知道，在大多数情况下，服务更可取，因为它们直接在调用站点启动，这种方法使代码更加清晰.

I know, that in most cases services preferable, because they are initiated directly at the call site and this approach making code more clear.

虽然更难推理，但当事情分散到事件中时，系统会做什么.

While harder to reason, what a system doing, when things are spread out over events.

1. 何时使用侦听器比使用服务更好?
2. 如何使用监听器并保持代码清晰?

请举几个例子.任何帮助，将不胜感激！非常感谢！

Please, give some examples. Any help would be appreciated! Thanks a lot!

推荐答案

当您创建不应由其客户端修改但仍可扩展的可重用包/组件时，侦听器是有意义的.

Listeners make sense when you create a reusable bundle/component that should not be modified by its clients but still be extensible.

侦听器对应用程序代码没有多大意义，因为它们添加了一个间接级别，这使得更难弄清楚发生了什么.

Listeners don't make much sense for application code because they add a level of indirection that makes it harder to figure out what's going on.

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