Design patterns used in symfony2

Question

In symfony2, the services using Singleton patterns. Doctrine uses Unit of work patterns. I wonder a lot of design patterns may be used in symfony2. I think it will be useful to have better understanding of design patterns. My question is what are the design patterns used in symfony2?

Solution 1

I just created this graph. As a guideline for a course on Sf2.

Solution 2

I think you can find any design pattern exploring Symfony2 components. For example, Form component provide you with Factory, Facade, Composite, Builder, Flyweight pattern examples.

And don't forget about the main Dependency Injection pattern used in Symfony2