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Hands-On Design Patterns with Java

You're reading from   Hands-On Design Patterns with Java Learn design patterns that enable the building of large-scale software architectures

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Product type Paperback
Published in Apr 2019
Publisher Packt
ISBN-13 9781789809770
Length 360 pages
Edition 1st Edition
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Author (1):
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Dr. Edward Lavieri Jr. Dr. Edward Lavieri Jr.
Author Profile Icon Dr. Edward Lavieri Jr.
Dr. Edward Lavieri Jr.
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Table of Contents (15) Chapters Close

Preface 1. Section 1: Introducing Design Patterns
2. Unified Modeling Language Primer FREE CHAPTER 3. Object-Oriented Design Patterns 4. Section 2: Original Design Patterns
5. Behavioral Design Patterns 6. Creational Design Patterns 7. Structural Design Patterns 8. Section 3: New Design Patterns
9. Architectural Patterns - Part I 10. Architectural Patterns - Part II 11. Functional Design Patterns 12. Reactive Design Patterns 13. Assessments 14. Other Books You May Enjoy

Understanding the circuit-breaker design pattern

The circuit-breaker design pattern is based on the same concept as an electrical circuit. As you can see in the following diagram, when the circuit is open, the flow of electricity is impeded and cannot flow between the two points—the power source and light bulb in our example. When the circuit is closed, electricity is unimpeded and the light bulb can receive power:

Circuit breaker—light-switch example

The circuit-breaker design pattern is modeled after electrical circuits. This design pattern has three possible states:

  • Open: If the state is open, then an error will be returned.
  • Closed: This is the preferred state where functionality is permitted.
  • Half-Open: This state is used after an open state error and a wait period. The function will allow one use as a test.

If the test is successful, the circuit will be closed...

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