5 files changed, 160 insertions, 0 deletions
diff --git a/vendor/open-telemetry/sdk/Common/Future/CancellationInterface.php b/vendor/open-telemetry/sdk/Common/Future/CancellationInterface.php
new file mode 100644
index 000000000..16909ec6d
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Common/Future/CancellationInterface.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Future;
+
+use Closure;
+use Throwable;
+
+interface CancellationInterface
+{
+    /**
+     * @param Closure(Throwable): void $callback
+     */
+    public function subscribe(Closure $callback): string;
+
+    public function unsubscribe(string $id): void;
+}
diff --git a/vendor/open-telemetry/sdk/Common/Future/CompletedFuture.php b/vendor/open-telemetry/sdk/Common/Future/CompletedFuture.php
new file mode 100644
index 000000000..7f0cd6536
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Common/Future/CompletedFuture.php
@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Future;
+
+use Closure;
+use Throwable;
+
+/**
+ * @template T
+ * @template-implements FutureInterface<T>
+ */
+final class CompletedFuture implements FutureInterface
+{
+    /** @var T */
+    private $value;
+
+    /**
+     * @param T $value
+     */
+    public function __construct($value)
+    {
+        $this->value = $value;
+    }
+
+    public function await()
+    {
+        return $this->value;
+    }
+
+    public function map(Closure $closure): FutureInterface
+    {
+        $c = $closure;
+        unset($closure);
+
+        try {
+            return new CompletedFuture($c($this->value));
+        } catch (Throwable $e) {
+            return new ErrorFuture($e);
+        }
+    }
+
+    public function catch(Closure $closure): FutureInterface
+    {
+        return $this;
+    }
+}
diff --git a/vendor/open-telemetry/sdk/Common/Future/ErrorFuture.php b/vendor/open-telemetry/sdk/Common/Future/ErrorFuture.php
new file mode 100644
index 000000000..32cf3d995
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Common/Future/ErrorFuture.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Future;
+
+use Closure;
+use Throwable;
+
+final class ErrorFuture implements FutureInterface
+{
+    private Throwable $throwable;
+
+    public function __construct(Throwable $throwable)
+    {
+        $this->throwable = $throwable;
+    }
+
+    public function await()
+    {
+        throw $this->throwable;
+    }
+
+    public function map(Closure $closure): FutureInterface
+    {
+        return $this;
+    }
+
+    public function catch(Closure $closure): FutureInterface
+    {
+        $c = $closure;
+        unset($closure);
+
+        try {
+            return new CompletedFuture($c($this->throwable));
+        } catch (Throwable $e) {
+            return new ErrorFuture($e);
+        }
+    }
+}
diff --git a/vendor/open-telemetry/sdk/Common/Future/FutureInterface.php b/vendor/open-telemetry/sdk/Common/Future/FutureInterface.php
new file mode 100644
index 000000000..850699bf6
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Common/Future/FutureInterface.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Future;
+
+use Closure;
+
+/**
+ * @template-covariant T
+ */
+interface FutureInterface
+{
+    /**
+     * @psalm-return T
+     */
+    public function await();
+
+    /**
+     * @psalm-template U
+     * @psalm-param Closure(T): U $closure
+     * @psalm-return FutureInterface<U>
+     *
+     * @psalm-suppress InvalidTemplateParam
+     */
+    public function map(Closure $closure): FutureInterface;
+
+    /**
+     * @psalm-template U
+     * @psalm-param Closure(\Throwable): U $closure
+     * @psalm-return FutureInterface<T|U>
+     */
+    public function catch(Closure $closure): FutureInterface;
+}
diff --git a/vendor/open-telemetry/sdk/Common/Future/NullCancellation.php b/vendor/open-telemetry/sdk/Common/Future/NullCancellation.php
new file mode 100644
index 000000000..5e5b642f9
--- /dev/null
+++ b/vendor/open-telemetry/sdk/Common/Future/NullCancellation.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\SDK\Common\Future;
+
+use Closure;
+
+final class NullCancellation implements CancellationInterface
+{
+    public function subscribe(Closure $callback): string
+    {
+        return self::class;
+    }
+
+    public function unsubscribe(string $id): void
+    {
+        // no-op
+    }
+}