Facade: Implementation and Example
Explore how to implement the Facade design pattern in C# to coordinate multiple backend services for retrieving product lists based on account data. This lesson guides you through creating services, composing them with a Facade class, and understanding how this pattern simplifies complex system interactions for cleaner, maintainable code.
Implementing the Facade design pattern
Let’s imagine that we need to build an application where, if we input the account name, we’re able to retrieve the list of products this account is allowed to buy. To achieve this, we’ll have to deal with multiple back-end systems. A list of products will be returned based on which category the account belongs to and whether or not the account is a buyer or a reseller. However, our application doesn’t hold this information. There’s another service that’ll return the account category based on the account ID. The problem is that our application doesn’t store the account ID either. It operates within its own bounded context where account id doesn’t exist. Only the name of the account is known. So, we need to call another service to obtain the account ...