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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Common\Time;
final class StopWatch implements StopWatchInterface
{
private const INITIAL_ELAPSED_TIME = 0;
private ClockInterface $clock;
private bool $running = false;
private ?int $initialStartTime;
private ?int $startTime = null;
private ?int $stopTime = null;
public function __construct(ClockInterface $clock, ?int $initialStartTime = null)
{
$this->clock = $clock;
$this->initialStartTime = $initialStartTime;
}
public function isRunning(): bool
{
return $this->running;
}
public function start(): void
{
// resolve start time as early as possible
$startTime = $this->time();
if ($this->isRunning()) {
return;
}
$this->startTime = $startTime;
if (!$this->hasBeenStarted()) {
$this->initialStartTime = $startTime;
}
$this->running = true;
}
public function stop(): void
{
if (!$this->isRunning()) {
return;
}
$this->stopTime = $this->time();
$this->running = false;
}
public function reset(): void
{
$this->startTime = $this->initialStartTime = $this->isRunning() ? $this->time() : null;
}
public function getElapsedTime(): int
{
if (!$this->hasBeenStarted()) {
return self::INITIAL_ELAPSED_TIME;
}
return $this->calculateElapsedTime();
}
public function getLastElapsedTime(): int
{
if (!$this->hasBeenStarted()) {
return self::INITIAL_ELAPSED_TIME;
}
return $this->calculateLastElapsedTime();
}
private function time(): int
{
return $this->clock->now();
}
private function hasBeenStarted(): bool
{
return $this->initialStartTime !== null;
}
private function calculateElapsedTime(): int
{
$referenceTime = $this->isRunning()
? $this->time()
: $this->getStopTime();
return $referenceTime - $this->getInitialStartTime();
}
private function calculateLastElapsedTime(): int
{
$referenceTime = $this->isRunning()
? $this->time()
: $this->getStopTime();
return $referenceTime - $this->getStartTime();
}
private function getInitialStartTime(): ?int
{
return $this->initialStartTime;
}
private function getStartTime(): ?int
{
return $this->startTime;
}
private function getStopTime(): ?int
{
return $this->stopTime;
}
}
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