/usr/share/php/Monolog/Handler/SamplingHandler.php is in php-monolog 1.17.2-1ubuntu4.
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/*
* 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;
/**
* 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, $fingersCrossedHandler).
* @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 $this->handler->isHandling($record);
}
public function handle(array $record)
{
if ($this->isHandling($record) && mt_rand(1, $this->factor) === 1) {
// The same logic as in FingersCrossedHandler
if (!$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");
}
}
if ($this->processors) {
foreach ($this->processors as $processor) {
$record = call_user_func($processor, $record);
}
}
$this->handler->handle($record);
}
return false === $this->bubble;
}
}
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