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<?php |
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/** |
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* This file is part of the bugloos/fault-tolerance-bundle project. |
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* (c) Bugloos <https://bugloos.com/> |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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namespace Bugloos\FaultToleranceBundle\CircuitBreaker; |
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use Bugloos\FaultToleranceBundle\CircuitBreaker\Storage\Storage; |
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use Psr\Cache\InvalidArgumentException; |
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/** |
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* @author Mojtaba Gheytasi <[email protected]> |
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*/ |
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class CircuitBreaker |
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{ |
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private Storage $storage; |
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private string $commandKey; |
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private array $config; |
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public function __construct( |
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string $commandKey, |
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Storage $storage, |
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array $config |
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) { |
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$this->commandKey = $commandKey; |
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$this->storage = $storage; |
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$this->config = $config; |
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} |
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/** |
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* @throws InvalidArgumentException |
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*/ |
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private function isOpen(): bool |
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{ |
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if ($this->storage->isOpen($this->commandKey)) { |
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return true; |
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} |
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if ( |
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$this->storage->failureCount($this->commandKey) >= $this->config['failureRateThreshold'] |
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) { |
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$this->storage->setOpenCircuit( |
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$this->commandKey, |
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$this->config['timeWindow'] |
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); |
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$this->storage->setHalfOpenCircuit( |
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$this->commandKey, |
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$this->config['timeWindow'], |
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$this->config['intervalToHalfOpen'] |
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); |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @throws InvalidArgumentException |
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*/ |
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public function allowRequest(): bool |
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{ |
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if ($this->config['forceOpen']) { |
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return false; |
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} |
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if ($this->config['forceClosed']) { |
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return true; |
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} |
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return ! $this->isOpen(); |
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} |
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/** |
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* @throws InvalidArgumentException |
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*/ |
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public function markAsSuccess() |
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{ |
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$this->storage->setSuccess($this->commandKey); |
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} |
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/** |
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* @throws InvalidArgumentException |
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*/ |
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public function markAsFailure(): void |
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{ |
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if ($this->storage->isHalfOpen($this->commandKey)) { |
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$this->storage->setOpenCircuit( |
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$this->commandKey, |
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$this->config['timeWindow'] |
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); |
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$this->storage->setHalfOpenCircuit( |
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$this->commandKey, |
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$this->config['timeWindow'], |
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$this->config['intervalToHalfOpen'] |
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); |
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} |
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$this->storage->incrementFailure( |
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$this->commandKey, |
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$this->config['timeWindow'] |
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); |
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} |
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} |
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bugloos /
fault-tolerance-bundle
