83 lines
2.2 KiB
PHP
83 lines
2.2 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace OpenTelemetry\SDK\Common\Util;
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use function array_key_last;
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use ArrayAccess;
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use Closure;
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use function register_shutdown_function;
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final class ShutdownHandler
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{
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/** @var array<int, Closure>|null */
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private static ?array $handlers = null;
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/** @var ArrayAccess<object, self>|null */
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private static ?ArrayAccess $weakMap = null;
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private array $ids = [];
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private function __construct()
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{
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}
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public function __destruct()
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{
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if (!self::$handlers) {
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return;
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}
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foreach ($this->ids as $id) {
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unset(self::$handlers[$id]);
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}
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}
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/**
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* Registers a function that will be executed on shutdown.
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*
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* If the given function is bound to an object, then the function will only
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* be executed if the bound object is still referenced on shutdown handler
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* invocation.
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*
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* ```php
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* ShutdownHandler::register([$tracerProvider, 'shutdown']);
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* ```
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*
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* @param callable $shutdownFunction function to register
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*
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* @see register_shutdown_function
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*/
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public static function register(callable $shutdownFunction): void
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{
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self::registerShutdownFunction();
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self::$handlers[] = weaken(closure($shutdownFunction), $target);
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if (!$object = $target) {
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return;
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}
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self::$weakMap ??= WeakMap::create();
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$handler = self::$weakMap[$object] ??= new self();
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$handler->ids[] = array_key_last(self::$handlers);
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}
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private static function registerShutdownFunction(): void
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{
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if (self::$handlers === null) {
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register_shutdown_function(static function (): void {
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$handlers = self::$handlers;
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self::$handlers = null;
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self::$weakMap = null;
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// Push shutdown to end of queue
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// @phan-suppress-next-line PhanTypeMismatchArgumentInternal
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register_shutdown_function(static function (array $handlers): void {
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foreach ($handlers as $handler) {
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$handler();
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}
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}, $handlers);
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});
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}
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}
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}
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