[WIP] loadModule event and ServiceListener support for Modules

[coss]

Adds the ability for modules to listen to the loadModule(ModuleEvent) and to add an own Service Manager to the ServiceListener.

While this is nice to have, it adds some overhead which might not be necessary considering the rare use case. The overhead is mainly caused by the Event Manager/Listeners, and not by the Module Manager.

Benchmark (best of 10 requests):

• 1 Module (ZendSkeletonApplication):
  • Current: http://i.imgur.com/G2P93.jpg
  • Patch: http://i.imgur.com/3G68I.jpg
• 1 Module (ZendSkeletonApplication) + 20 Dummy Modules:
  • Current: http://i.imgur.com/omWTk.png
  • Patch: http://i.imgur.com/zPL4u.png

Imho, this should only be merged, if we can squeeze some performance out of ZF2.

[travisbot]

This pull request fails (merged 1b9300c into 588a0f0).

[coss]

I will write/fix tests later...

[weierophinney]

I would argue that this should be an extension of the ModuleManager, and could be substituted via a custom factory provided in the configuration.

[coss]

@weierophinney I kinda agree with you, because, like I said, I don't think that the rare use case justifies that much of an overhead and because RC1 is almost there, there is not much time to look how the performance can be increased, before the API freeze.

onLoadModule callbacks should be avoided anyway, because they are to expensive. Tho' the ServiceListener feature would be nice for ZendDeveloperTools :)