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|
<?php
namespace Liuggio\StatsdClient\Service;
use Liuggio\StatsdClient\Entity\StatsdDataInterface;
use Liuggio\StatsdClient\Factory\StatsdDataFactory;
use Liuggio\StatsdClient\Factory\StatsdDataFactoryInterface;
use Liuggio\StatsdClient\StatsdClient;
use Liuggio\StatsdClient\Entity\StatsdData;
/**
* Simplifies access to StatsD client and factory, buffers all data.
*/
class StatsdService implements StatsdDataFactoryInterface
{
/**
* @var \Liuggio\StatsdClient\StatsdClient
*/
protected $client;
/**
* @var \Liuggio\StatsdClient\Factory\StatsdDataFactoryInterface
*/
protected $factory;
/**
* @var StatsdData[]
*/
protected $buffer = array();
/**
* @var float
*/
protected $samplingRate;
private $samplingFunction;
/**
* @param StatsdClient $client
* @param StatsdDataFactoryInterface $factory
* @param float $samplingRate see setSamplingRate
*/
public function __construct(
StatsdClient $client,
StatsdDataFactoryInterface $factory = null,
$samplingRate = 1
) {
$this->client = $client;
if (is_null($factory)) {
$factory = new StatsdDataFactory();
}
$this->factory = $factory;
$this->setSamplingRate($samplingRate);
}
/**
* Actually defines the sampling rate used by the service.
* If set to 0.1, the service will automatically discard 10%
* of the incoming metrics. It will also automatically flag these
* as sampled data to statsd.
*
* @param float $samplingRate
*/
public function setSamplingRate($samplingRate)
{
if ($samplingRate <= 0.0 || 1.0 < $samplingRate) {
throw new \LogicException('Sampling rate shall be within ]0, 1]');
}
$this->samplingRate = $samplingRate;
$this->samplingFunction = function($min, $max){
return rand($min, $max);
};
}
/**
* @return float
*/
public function getSamplingRate()
{
return $this->samplingRate;
}
/**
* {@inheritdoc}
*/
public function timing($key, $time)
{
$this->appendToBuffer(
$this->factory->timing($key, $time)
);
return $this;
}
/**
* {@inheritdoc}
*/
public function gauge($key, $value)
{
$this->appendToBuffer(
$this->factory->gauge($key, $value)
);
return $this;
}
/**
* {@inheritdoc}
*/
public function set($key, $value)
{
$this->appendToBuffer(
$this->factory->set($key, $value)
);
return $this;
}
/**
* {@inheritdoc}
*/
public function increment($key)
{
$this->appendToBuffer(
$this->factory->increment($key)
);
return $this;
}
/**
* {@inheritdoc}
*/
public function decrement($key)
{
$this->appendToBuffer(
$this->factory->decrement($key)
);
return $this;
}
/**
* {@inheritdoc}
*/
public function updateCount($key, $delta)
{
$this->appendToBuffer(
$this->factory->updateCount($key, $delta)
);
return $this;
}
/**
* {@inheritdoc}
*/
public function produceStatsdData($key, $value = 1, $metric = StatsdDataInterface::STATSD_METRIC_COUNT)
{
throw new \BadFunctionCallException('produceStatsdData is not implemented');
}
/**
* @param callable $samplingFunction rand() function by default.
*/
public function setSamplingFunction(\Closure $samplingFunction)
{
$this->samplingFunction = $samplingFunction;
}
private function appendToBuffer(StatsdData $data)
{
if($this->samplingRate < 1){
$data->setSampleRate($this->samplingRate);
$result = call_user_func($this->samplingFunction, 0 , floor(1 / $this->samplingRate));
if ($result == 0) {
array_push($this->buffer, $data);
};
} else {
array_push($this->buffer, $data);
}
}
/**
* Send all buffered data to statsd.
*
* @return $this
*/
public function flush()
{
$this->client->send($this->buffer);
$this->buffer = array();
return $this;
}
}
|
