From the course: Practical Design Patterns in Swift
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The surrogate - Swift Tutorial
From the course: Practical Design Patterns in Swift
The surrogate
- [Instructor] The proxy pattern is about managing and controlling access to specific objects. The proxy acts as a placeholder for the proxied instance and introduces an additional level of interaction to support controlled, remote, or delayed access. Why would we need that additional level of indirection? There are certain situations when providing a surrogate is a better choice than accessing the object directly. The first case, the object is a resource hog, and you want to delay its creation until it's first accessed. Lazy properties are a perfect example of this delayed initialization. Case number two, you rely on a remote resource, like a web service. The remote proxy acts as a local placeholder to control and optimize the access to the real resource. For example, a remote proxy may batch network calls before accessing RESTful service or return cached data instead of firing a network request. Case number three, you use protected or sensitive resources. The protective proxy…
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