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Hands-On Cloud Development with WildFly

You're reading from   Hands-On Cloud Development with WildFly Develop, deploy, and configure cloud-based, enterprise Java applications with WildFly Swarm and OpenShift

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781786462374
Length 310 pages
Edition 1st Edition
Languages
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Author (1):
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Tomasz Adamski Tomasz Adamski
Author Profile Icon Tomasz Adamski
Tomasz Adamski
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Table of Contents (14) Chapters Close

Preface 1. Java EE and Modern Architectural Methodologies 2. Getting Familiar with WildFly Swarm FREE CHAPTER 3. Right-Sizing Your Services 4. Tuning the Configuration of Your Services 5. Testing Your Services with Arquillian 6. Deploying Applications on the Cloud with OpenShift 7. Configuring Storage for Your Applications 8. Scaling and Connecting Your Services 9. Configuring Continuous Integration Using Jenkins 10. Providing Security Using Keycloak 11. Adding Resilience Using Hystrix 12. Future Direction 13. Other Books You May Enjoy

The circuit breaker pattern

The architectural design pattern created to deal with the problems described previously is the circuit breaker pattern. The main idea behind it is simple: wrap the invocation code into the command, which will perform the invocation, and calculate the status of the remote service. If the service is declared unreachable by the metrics used by the command, then the next invocations are rejected immediately. After a given time, new connections will be tried again, and, if successful, the command will start performing invocations to the service again.

The name of the pattern was taken from the electrical circuit breaker, a device used to protect the electrical circuit from the damage that may result from the excess electrical current. If the current in the circuit is too high then the circuit breaker opens, preventing the current from flowing. In order to...

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