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<?php namespace Amp\Loop; // @codeCoverageIgnoreStart class DriverFactory { /** * Creates a new loop instance and chooses the best available driver. * * @return Driver * * @throws \Error If an invalid class has been specified via AMP_LOOP_DRIVER */ public function create(): Driver { $driver = (function () { if ($driver = $this->createDriverFromEnv()) { return $driver; } if (UvDriver::isSupported()) { return new UvDriver; } if (EvDriver::isSupported()) { return new EvDriver; } if (EventDriver::isSupported()) { return new EventDriver; } return new NativeDriver; })(); if (\getenv("AMP_DEBUG_TRACE_WATCHERS")) { return new TracingDriver($driver); } return $driver; } /** * @return Driver|null */ private function createDriverFromEnv() { $driver = \getenv("AMP_LOOP_DRIVER"); if (!$driver) { return null; } if (!\class_exists($driver)) { throw new \Error(\sprintf( "Driver '%s' does not exist.", $driver )); } if (!\is_subclass_of($driver, Driver::class)) { throw new \Error(\sprintf( "Driver '%s' is not a subclass of '%s'.", $driver, Driver::class )); } return new $driver; } } // @codeCoverageIgnoreEnd
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