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<?php /* * This file is part of the Monolog package. * * (c) Jordi Boggiano <j.boggiano@seld.be> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Monolog\Handler; use Monolog\Formatter\FormatterInterface; /** * Sampling handler * * A sampled event stream can be useful for logging high frequency events in * a production environment where you only need an idea of what is happening * and are not concerned with capturing every occurrence. Since the decision to * handle or not handle a particular event is determined randomly, the * resulting sampled log is not guaranteed to contain 1/N of the events that * occurred in the application, but based on the Law of large numbers, it will * tend to be close to this ratio with a large number of attempts. * * @author Bryan Davis <bd808@wikimedia.org> * @author Kunal Mehta <legoktm@gmail.com> */ class SamplingHandler extends AbstractHandler { /** * @var callable|HandlerInterface $handler */ protected $handler; /** * @var int $factor */ protected $factor; /** * @param callable|HandlerInterface $handler Handler or factory callable($record|null, $samplingHandler). * @param int $factor Sample factor */ public function __construct($handler, $factor) { parent::__construct(); $this->handler = $handler; $this->factor = $factor; if (!$this->handler instanceof HandlerInterface && !is_callable($this->handler)) { throw new \RuntimeException("The given handler (".json_encode($this->handler).") is not a callable nor a Monolog\Handler\HandlerInterface object"); } } public function isHandling(array $record) { return $this->getHandler($record)->isHandling($record); } public function handle(array $record) { if ($this->isHandling($record) && mt_rand(1, $this->factor) === 1) { if ($this->processors) { foreach ($this->processors as $processor) { $record = call_user_func($processor, $record); } } $this->getHandler($record)->handle($record); } return false === $this->bubble; } /** * Return the nested handler * * If the handler was provided as a factory callable, this will trigger the handler's instantiation. * * @return HandlerInterface */ public function getHandler(array $record = null) { if (!$this->handler instanceof HandlerInterface) { $this->handler = call_user_func($this->handler, $record, $this); if (!$this->handler instanceof HandlerInterface) { throw new \RuntimeException("The factory callable should return a HandlerInterface"); } } return $this->handler; } /** * {@inheritdoc} */ public function setFormatter(FormatterInterface $formatter) { $this->getHandler()->setFormatter($formatter); return $this; } /** * {@inheritdoc} */ public function getFormatter() { return $this->getHandler()->getFormatter(); } }
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