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Software Architecture with C++

You're reading from   Software Architecture with C++ Design modern systems using effective architecture concepts, design patterns, and techniques with C++20

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Product type Paperback
Published in Apr 2021
Publisher Packt
ISBN-13 9781838554590
Length 540 pages
Edition 1st Edition
Languages
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Authors (2):
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Adrian Ostrowski Adrian Ostrowski
Author Profile Icon Adrian Ostrowski
Adrian Ostrowski
Piotr Gaczkowski Piotr Gaczkowski
Author Profile Icon Piotr Gaczkowski
Piotr Gaczkowski
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Table of Contents (24) Chapters Close

Preface 1. Section 1: Concepts and Components of Software Architecture
2. Importance of Software Architecture and Principles of Great Design FREE CHAPTER 3. Architectural Styles 4. Functional and Nonfunctional Requirements 5. Section 2: The Design and Development of C++ Software
6. Architectural and System Design 7. Leveraging C++ Language Features 8. Design Patterns and C++ 9. Building and Packaging 10. Section 3: Architectural Quality Attributes
11. Writing Testable Code 12. Continuous Integration and Continuous Deployment 13. Security in Code and Deployment 14. Performance 15. Section 4: Cloud-Native Design Principles
16. Service-Oriented Architecture 17. Designing Microservices 18. Containers 19. Cloud-Native Design 20. Assessments 21. About Packt 22. Other Books You May Enjoy Appendix A

Circuit breaker

The circuit breaker pattern is a very useful tool for this. It allows us to quickly notice that a service is unable to process requests, so the calls to it can be short-circuited. This can happen both close to the callee (Envoy provides such a capability), or on the caller side (with the additional benefit of shaving off time from the calls). In Envoy's case, it can be as simple as adding the following to your config:

circuit_breakers:
  thresholds:
    - priority: DEFAULT
      max_connections: 1000
      max_requests: 1000
      max_pending_requests: 1000

In both cases, the load caused by the calls to the service may drop, which in some cases can help the service return to normal operation.

How do we implement a circuit breaker on the caller side? Once you've made a few calls, and, say, your leaky bucket overflows, you can just stop making new calls for a specified period of time (for example, until the bucket no longer overflows). Simple and effective.

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