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<?php
namespace Jaeger\Sampler;
use Jaeger\Util\RateLimiter;
use const Jaeger\SAMPLER_PARAM_TAG_KEY;
use const Jaeger\SAMPLER_TYPE_RATE_LIMITING;
use const Jaeger\SAMPLER_TYPE_TAG_KEY;
class RateLimitingSampler implements SamplerInterface
{
/**
* @var RateLimiter
*/
private $rateLimiter;
/**
* A list of the sampler tags.
*
* @var array
*/
private $tags = [];
public function __construct($maxTracesPerSecond, RateLimiter $rateLimiter)
{
$this->tags = [
SAMPLER_TYPE_TAG_KEY => SAMPLER_TYPE_RATE_LIMITING,
SAMPLER_PARAM_TAG_KEY => $maxTracesPerSecond,
];
$maxTracesPerNanosecond = $maxTracesPerSecond / 1000000000.0;
$this->rateLimiter = $rateLimiter;
$this->rateLimiter->initialize($maxTracesPerNanosecond, $maxTracesPerSecond > 1.0 ? 1.0 : $maxTracesPerSecond);
}
/**
* Whether or not the new trace should be sampled.
*
* Implementations should return an array in the format [$decision, $tags].
*
* @param string $traceId The traceId on the span.
* @param string $operation The operation name set on the span.
* @return array
*/
public function isSampled(string $traceId = '', string $operation = '')
{
return [$this->rateLimiter->checkCredit(1.0), $this->tags];
}
/**
* {@inheritdoc}
*
* Only implemented to satisfy the sampler interface.
*
* @return void
*/
public function close()
{
// nothing to do
}
}
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