1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/opentracing/opentracing/src/OpenTracing/GlobalTracer.php b/vendor/opentracing/opentracing/src/OpenTracing/GlobalTracer.php
new file mode 100644
index 000000000..aafdba121
--- /dev/null
+++ b/vendor/opentracing/opentracing/src/OpenTracing/GlobalTracer.php
@@ -0,0 +1,60 @@
+<?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;
+    }
+}