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<?php |
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/** |
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* Async sockets |
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* |
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* @copyright Copyright (c) 2015-2017, Efimov Evgenij <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace AsyncSockets\RequestExecutor\Metadata; |
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/** |
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* Class SpeedRateCounter |
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*/ |
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class SpeedRateCounter |
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{ |
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/** |
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* Amount of processed bytes |
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* |
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* @var int |
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*/ |
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private $totalBytesProcessed; |
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/** |
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* Time when request is started |
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* |
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* @var double |
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*/ |
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private $initialTime; |
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/** |
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* Time of last measurement |
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* |
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* @var double |
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*/ |
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private $currentTime; |
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/** |
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* Time when speed felt below minimal |
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* |
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* @var double |
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*/ |
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private $slowStartTime; |
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/** |
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* Minimum allowed speed in bytes per second |
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* |
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* @var double |
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*/ |
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private $minSpeed; |
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/** |
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* Maximum duration of minimum speed in seconds |
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* |
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* @var double |
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*/ |
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private $maxDuration; |
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/** |
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* Current speed |
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* |
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* @var double |
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*/ |
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private $currentSpeed; |
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/** |
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* SpeedRateCounter constructor. |
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* |
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* @param double $minSpeed Minimum allowed speed in bytes per second |
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* @param double $maxDuration Maximum duration of minimum speed in seconds |
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*/ |
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public function __construct($minSpeed, $maxDuration) |
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{ |
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$this->minSpeed = $minSpeed; |
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$this->maxDuration = $maxDuration; |
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$this->reset(); |
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} |
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/** |
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* Resets this counter |
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* |
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* @return void |
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*/ |
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public function reset() |
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{ |
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$this->initialTime = null; |
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$this->currentTime = null; |
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$this->totalBytesProcessed = 0; |
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$this->currentSpeed = 0.0; |
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$this->slowStartTime = null; |
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} |
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/** |
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* Process next measurement |
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* |
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* @param double $time Time in seconds |
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* @param double $value Amount of received data in bytes |
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* |
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* @return void |
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* @throws \OverflowException When speed is slower then desired |
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*/ |
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public function advance($time, $value) |
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{ |
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$this->measure($time, $value); |
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$this->currentSpeed = $this->getAverageSpeed(); |
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$skipCheck = $this->minSpeed === null || |
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$this->maxDuration === null || |
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$this->currentSpeed === null || |
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$this->currentSpeed >= $this->minSpeed; |
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if ($skipCheck) { |
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$this->slowStartTime = null; |
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return; |
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} |
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$this->slowStartTime = $this->slowStartTime !== null ? $this->slowStartTime : $time; |
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if ($time - $this->slowStartTime > $this->maxDuration) { |
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throw new \OverflowException(); |
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} |
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} |
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/** |
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* Adds measure for counter |
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* |
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* @param double $time Time for given value in absolute timestamp |
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* @param double $value A value |
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* |
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* @return void |
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*/ |
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private function measure($time, $value) |
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{ |
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if ($this->initialTime === null) { |
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$this->initialTime = $time; |
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} else { |
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$this->currentTime = $time; |
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} |
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$this->totalBytesProcessed += $value; |
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} |
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/** |
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* Return average speed for measurements |
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* |
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* @return double|null |
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*/ |
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private function getAverageSpeed() |
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{ |
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$timeElapsed = $this->currentTime - $this->initialTime; |
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return $timeElapsed > 0 ? ($this->totalBytesProcessed / $timeElapsed) : 0.0; |
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} |
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/** |
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* Return current speed in bytes per seconds |
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* |
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* @return float |
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*/ |
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public function getCurrentSpeed() |
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{ |
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return $this->getAverageSpeed(); |
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} |
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/** |
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* Return duration of current slow speed |
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* |
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* @return double |
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*/ |
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public function getCurrentDuration() |
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{ |
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return $this->slowStartTime !== null ? $this->currentTime - $this->slowStartTime : 0.0; |
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} |
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} |
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|
edefimov /
async-sockets
