Factory pattern and Abstract Factory

[Axat]

For the Final , are we supposed to know both of them, the Factory
method pattern and the abstract factory pattern or just the Factory
method pattern?

[Paul Carter]

You should know both. Note that the Abstract Factory pattern is a fairly straightforward extension of the Factory Method pattern.

Paul

[Axat]

Which lecture notes pertain to the singleton pattern?

[Paul Carter]

This pattern wasn't covered - please see the study guide for the final exam posted on the course schedule page.

Paul

[dslater]

Since Abstract Factory Pattern was not included in our readings is the
Wikipedia page also accurate on that topic?

http://en.wikipedia.org/wiki/Abstract_factory_pattern

On Apr 24, 7:32 pm, Paul Carter <pcar...@cs.ubc.ca> wrote:
> This pattern wasn't covered - please see the study guide for the final exam posted on the course schedule page.
>
> Paul
>

[Paul Carter]

It's not bad but the example isn't the greatest as the abstract factory has only one factory method. In general, the abstract factory has a family of related factory methods. You can find a more general example here:

http://www.oodesign.com/abstract-factory-pattern.html

- scroll down to the "look and feel" example and you'll see a more general version of the example on the Wikipedia page you linked to in your message. This more general version is similar to the example we saw in class with the ingredient factory for the pizza store.

Paul

[John-Jose]

Just to double check, in the oodesign.com UML, the products should be
dependent on the concrete factories, as opposed to have a uni-
directional association as shown?

Or is that a design decision?

For example, in our pizza example, product PlainDough has a dependency
on WhistlerIngredientFactory? Not a uni-directional association,
because the factory doesn't have an 'instance-level variable' of the
dough?

On Apr 24, 9:19 pm, Paul Carter <pcar...@cs.ubc.ca> wrote:
> It's not bad but the example isn't the greatest as the abstract factory has only one factory method.  In general, the abstract factory has a family of related factory methods.  You can find a more general example here:
>
> http://www.oodesign.com/abstract-factory-pattern.html
>
> - scroll down to the "look and feel" example and you'll see a more general version of the example on the Wikipedia page you linked to in your message.  This more general version is similar to the example we saw in class with the ingredient factory for the pizza store.
>
> Paul
>

[Paul Carter]

Good observation.

You've got the right idea but It's the concrete factories that have a dependency on the concrete products, not the other way around. There's nothing in these examples to suggest that there should be an association from the concrete factories to the concrete products.

Paul