LateBindingMeterProvider.php

<?php

declare (strict_types=1);
namespace OpenTelemetry\API\Metrics;

use Closure;
class LateBindingMeterProvider implements MeterProviderInterface {
    private ?MeterProviderInterface $meterProvider = null;
    
    /** @param Closure(): MeterProviderInterface $factory */
    public function __construct(Closure $factory) {
    }
    public function getMeter(string $name, ?string $version = null, ?string $schemaUrl = null, iterable $attributes = []) : MeterInterface {
        return $this->meterProvider?->getMeter($name, $version, $schemaUrl, $attributes) ?? new LateBindingMeter(fn(): MeterInterface => ($this->meterProvider ??= ($this->factory)())
            ->getMeter($name, $version, $schemaUrl, $attributes));
    }

}