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<?php
declare(strict_types=1);
namespace OpenTracing;
final class GlobalTracer
{
/**
* @var Tracer
*/
private static $instance;
/**
* @var bool
*/
private static $isRegistered = false;
/**
* GlobalTracer::set sets the [singleton] Tracer returned by get().
* Those who use GlobalTracer (rather than directly manage a Tracer instance)
* should call GlobalTracer::set as early as possible in bootstrap, prior to
* start a new span. Prior to calling GlobalTracer::set, any Spans started
* via the `Tracer::startActiveSpan` (etc) globals are noops.
*
* @param Tracer $tracer
* @return void
*/
public static function set(Tracer $tracer): void
{
self::$instance = $tracer;
self::$isRegistered = true;
}
/**
* GlobalTracer::get returns the global singleton `Tracer` implementation.
* Before `GlobalTracer::set` is called, the `GlobalTracer::get` is a noop
* implementation that drops all data handed to it.
*
* @return Tracer
*/
public static function get(): Tracer
{
if (self::$instance === null) {
self::$instance = new NoopTracer();
}
return self::$instance;
}
/**
* Returns true if a global tracer has been registered, otherwise returns false.
*
* @return bool
*/
public static function isRegistered(): bool
{
return self::$isRegistered;
}
}
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