simple-circuitbreaker

http://thecookiezen.com/blog/2015/11/15/circuitbreaker-cure-for-fallen-microservices/

simple and thread-safe circuitbreaker implementation without HALF-OPEN state based on Hystrix implementation

Hystrix dependecy is used just for Sliding/Rolling Window implementation and maybe it's little overhead to use the whole library from Netflix but this is just example :) When I find some time I will probably make my own Sliding Window implementation to keep simplicity.

Todo

• introduce HALF-OPEN state for full circuitbreaker functionality
• own implementation of sliding window algorithm
• simple circuit health based on errors count in a certain time interval without sliding window algorithm
• unit tests
• extract interface for circuitbreaker and implement no op implementation
• get rid of hardcoded configuration :(

Usage

public class TestCase {

    private CircuitBreaker circuitBreaker = new DefaultCircuitBreaker(5, TimeUnit.MINUTES);
    private MailService mailService = new MailService();
 		
    public String doSomething(String destination, Mail mail) throws Exception {
        circuitBreaker.doCall((destination, mail) -> mailService.sendMail(destination, mail));
    }
}