Understanding Polly: A Resilience Framework for .NET Applications

A detailed overview of Polly, a resilience framework for .NET applications designed to help applications recover from failures and outages in external infrastructure. The framework provides building blocks like fluent API, retry strategies, timeouts, and code samples to ensure applications can gracefully handle failures.

• Polly Resilience Framework
• .NET Applications
• Recovery Strategies
• Building Blocks
• Fluent API

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1. Polly The .NET resilience framework Alan P. Barber 2019.07.25

2. Senior Consultant at Improving Alan P. Barber Software Developer Computer Scientist Scrum Master Crohn's Disease Fighter Father Blog: alanbarber.com Twitter: @alanbarber GitHub: github.com/alanbarber Husband

4. A tool to help applications recover from transient failures and extended outages in external infrastructure for which they depends upon. What is a Resilience Framework? If recovery is not possible, the framework should help applications to fail gracefully.

5. The building blocks

6. Fluent API Reusable Thread safe Policy Execution delegate Sync and Async Wrap multiple together

7. Policy Store Dictionary pattern Registry Reusable Dependency Injection

8. A tale of two strategies

9. Retry Maybe it's just a blip Wait and Retry Reactive Strategies Let s give it a second to recover Circuit Breaker Give the system a break Fallback Give up and fail gracefully

10. Timeout I m not going to wait forever Caching Proactive Strategies You already asked me that Bulkhead Isolation Controlled access to a resource

11. Code samples

12. Retry

13. Fallback

14. Wrapping policies together

15. Policy Registry

16. Unit testing

17. NoOp Provides a policy which executes passed delegates without intervention.

18. An important note

19. Support target platforms by version Earliest Polly version with support Latest Polly version with support Target platform .NET Standard 2.1 for use with IHttpClientFactory 6.0.1 Current .NET Standard 2.0 6.0.1 Current .NET Standard 2.0 5.0.3 Current .NET Standard 1.1 5.0.3 Current .NET Standard 1.0 5.0.3 5.1.0 .NET Framework 4.5 1.0.0 5.9.0

20. Resources http://www.thepollyproject.org https://github.com/App-vNext/Polly