Web services can become unreliable. Discover how to prepare our app by adding the ability to use backup services.
- [Narrator] Web services are not guaranteed…to function all of the time.…They may fail for various reasons,…such as time-out issues, or authentication problems.…We can try to avoid this problem by using multiple services.…If one service fails, we switch to another one.…This fallback strategy helps us…maximize our chances to deliver weather data.…The solution that we're going to rely on…is based on a well-known software design pattern…called "Chain of Responsibility."…This pattern organizes the potential…request processors in the sequence.…
The request travels through the sequence…until one of the processors handles it,…or until it reaches the end of the chain.…In our case, we need to build…a chain of network controllers.…Each network controller relies on a different web service.…If a web service fails for whatever reason,…the controller forwards the sent request…to the next controller if there is any.…To be at the sequence of controllers,…each controller should keep…a reference to the next controller.…
I'm going to need to add the back-up…
Author
Released
1/2/2018- Comparing object-oriented programming with protocol-oriented programming
- Methods and class-bound protocols
- Adopting a protocol
- Generics
- Declaring asynchronous behavior
- Preparing and implementing fallback logic
- Implementing an app using protocol-oriented programming
Skill Level Intermediate
Duration
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Introduction
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Welcome1m 3s
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1. Protocol-Oriented Programming
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The object-oriented way7m 28s
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POP vs. OO: The differences3m 50s
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2. Protocols
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What's a protocol?2m 29s
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Adopting a protocol1m 8s
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Polymorphism4m 12s
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Protocol inheritance4m 31s
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Protocol extensions4m 59s
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Protocol composition4m 23s
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3. Generics
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Why generics?1m 31s
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Generic types3m 15s
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Generics and protocols2m 48s
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Constrained associated types2m 51s
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4. Implement the Weather App Using POP
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Weather app design2m 54s
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Project overview1m 53s
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Presenting data4m 18s
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Fallback service3m 24s
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Implement fallback logic4m 3s
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Conclusion
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Next steps45s
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Video: Fallback service