The workflow of a request
The kernel.request Event
Resolve the Controller
The kernel.controller Event
Getting the Controller Arguments
Calling the Controller
The kernel.view Event
The kernel.response Event
The kernel.terminate Event
The HttpKernel component is responsible of the bundle mechanism used in Symfony applications. One of the key features of the bundles is that you can use logic paths instead of physical paths to refer to any of their resources (config files, templates, controllers, translation files, etc.)
This allows to import resources even if you don't know where in the filesystem a bundle will be installed. For example, the services.xml file stored in the Resources/config/ directory of a bundle called FooBundle can be referenced as @FooBundle/Resources/config/services.xml instead of __DIR__/Resources/config/services.xml.
This is possible thanks to the method provided by the kernel, which transforms logical paths into physical paths:
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$path = $kernel->locateResource('@FooBundle/Resources/config/services.xml');