Circuit breaker php

circuit-breaker.php

<?php

// The circuit breaker class
class CircuitBreaker
{
    // The failure threshold
    private $failureThreshold;

    // The failure count
    private $failureCount = 0;

    // The state of the circuit
    private $state = 'CLOSED';

    // Constructor that sets the failure threshold
    public function __construct($failureThreshold)
    {
        $this->failureThreshold = $failureThreshold;
    }

    // Method that checks if the circuit is open
    public function isOpen()
    {
        return $this->state === 'OPEN';
    }

    // Method that checks if the circuit is closed
    public function isClosed()
    {
        return $this->state === 'CLOSED';
    }

    // Method that increments the failure count and opens the circuit
    // if the failure threshold has been reached
    public function incrementFailureCount()
    {
        // Increment the failure count
        $this->failureCount++;

        // Check if the failure threshold has been reached
        if ($this->failureCount >= $this->failureThreshold) {
            // Set the state to open
            $this->state = 'OPEN';
        }
    }

    // Method that resets the failure count and closes the circuit
    public function reset()
    {
        $this->failureCount = 0;
        $this->state = 'CLOSED';
    }
}

<?php
// Create the circuit breaker with a failure threshold of 3
$circuitBreaker = new CircuitBreaker(3);

// Check if the circuit is closed
if ($circuitBreaker->isClosed()) {
    // Try to execute some operation
    try {
        executeOperation();
    } catch (Exception $e) {
        // Increment the failure count on error
        $circuitBreaker->incrementFailureCount();
    }
}

// Check if the circuit is open
if ($circuitBreaker->isOpen()) {
    // Fall back to a different operation or handle the error
    handleError();
}

// Reset the circuit breaker after a period of time
$circuitBreaker->reset();