PHP implementation of Circuit Breaker Pattern

For more information about this pattern see this.

This implementation has only redis adapter yet

Starting with composer

composer require leocarmo/circuit-breaker-php

Redis adapter

The first argument is a redis connection, the second is your product name, for redis namespace avoid key conflicts with another product using the same redis.

use LeoCarmo\CircuitBreaker\CircuitBreaker;

// Connect to redis
$redis = new \Redis();
$redis->connect('localhost', 6379);

$adapter = new \LeoCarmo\CircuitBreaker\Adapters\RedisAdapter($redis, 'my-product');

// Set redis adapter for CB
CircuitBreaker::setAdapter($adapter);

Set circuit break settings

This is not required, default values ​​will be set

// Configure settings for CB  
CircuitBreaker::setGlobalSettings([  
  'timeWindow' => 60, // Time for an open circuit (seconds)  
  'failureRateThreshold' => 50, // Fail rate for open the circuit  
  'intervalToHalfOpen' => 30, // Half open time (seconds)  
]);

Configure settings for specific service

// Configure settings for specific service
CircuitBreaker::setServiceSettings('my-custom-service', [  
  'timeWindow' => 30, // Time for an open circuit (seconds)  
  'failureRateThreshold' => 15, // Fail rate for open the circuit  
  'intervalToHalfOpen' => 10, // Half open time (seconds)  
]);

Check if circuit is available (closed)

Each check is for a specific service. So you can have multiple services in the same application, and when one circuit is open, the other works normally.

// Check circuit status for service: `my-service`
if (! CircuitBreaker::isAvailable('my-service')) {  
  die('Circuit is not available!');  
}

Record success and failure

// Usage example for success and failure  
try {  
  Service::execute('something');  
  CircuitBreaker::success('my-service');  
} catch (\ServiceException $e) {  
  CircuitBreaker::failure('my-service');  
  die($e->getMessage());  
}

Credits

• Leonardo Carmo