December 2018
Intermediate to advanced
414 pages
10h 19m
English
Content preview from Hands-On Design Patterns with Swift
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Building a network cache with the facade pattern
Let's take the example of a resource-caching library. When building our applications or servers, we often need to leverage caching to avoid repeatedly making the same network calls, impacting on the performance of our programs. Server-side, it's particularly important to reduce the number of database or external calls, making our servers faster by saving network round-trips.
Let's call this system CachedNetworking, and we'll implement it with the facade pattern.
Such a system may be composed of:
- URLSession: A system that fetches a resource based on its URLRequest
- Cache: The subsystem responsible for storing the results of the resource fetcher
- CacheCleaner: The subsystem responsible for ...
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