1 files changed, 119 insertions, 0 deletions
diff --git a/vendor/open-telemetry/sdk/Common/Time/StopWatch.php b/vendor/open-telemetry/sdk/Common/Time/StopWatch.php
new file mode 100644
index 000000000..b2abdabae
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Common/Time/StopWatch.php
@@ -0,0 +1,119 @@
+<?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;
+    }
+}