Facade design pattern

[ladybug]

So as I understand the facade design pattern lets the user access a complicated system through a facade in the name of better user friendliness, but if I am making a facade design pattern program, does the facade class need to be simple and user friendly, or does the program that accesses the facade class need to be user friendly and just call the facade and then everything complicated happens in the facade where there might be like a lot of methods that call other methods and give the user what they request?

 

[FuzzyLogic]

A facade class can be as complicated or simple as you need it to, since all it's really doing is providing abstraction for the user. So, the goal is to make the code that calls methods from the facade class simple, but the facade itself doesn't necessarily need to be simple.

 

As an example, I've used facade classes to aid in performing MySQL database queries. To do this, I've written methods like findWithID(id) or findWithHeightBetween(min, max) within the facade class that return a list of all the database entries matching the input. Here, the facade class allows the user to call a single method to get data from the database without needing to know anything about the underlying system or memorize a complicated database query.

 

So,

Facade class code: Doesn't really matter how simple it is

Caller code: Should be simpler as a result of using the facade

 

Hope this helps

[ladybug]

1 minute ago, dcgreen2k said:

A facade class can be as complicated or simple as you need it to, since all it's really doing is providing abstraction for the user. So, the goal is to make the code that calls methods from the facade class simple, but the facade itself doesn't necessarily need to be simple.

 

As an example, I've used facade classes to aid in performing MySQL database queries. To do this, I've written methods like findAll or findWithID within the facade class that return a list of all the database entries matched the input. Here, the facade class allows the user to call a single method to get data from the database without needing to know anything about the underlying system or memorize a complicated database query.

 

So:

Facade class code: Doesn't really matter how simple it is

Caller code: Should be simpler as a result of using the facade

 

Hope this helps

It helps, thanks a lot! Now I can be sure that I understood it correctly.