ContextStorage.php

<?php

declare (strict_types=1);
namespace OpenTelemetry\Context;


/**
 * @internal
 */
final class ContextStorage implements ContextStorageInterface, ContextStorageHeadAware, ExecutionContextAwareInterface {
    private ContextStorageHead $current;
    private ContextStorageHead $main;
    
    /** @var array<int|string, ContextStorageHead> */
    private array $forks = [];
    public function __construct() {
        $this->current = $this->main = new ContextStorageHead($this);
    }
    public function fork(int|string $id) : void {
        $this->forks[$id] = clone $this->current;
    }
    public function switch(int|string $id) : void {
        $this->current = $this->forks[$id] ?? $this->main;
    }
    public function destroy(int|string $id) : void {
        unset($this->forks[$id]);
    }
    public function head() : ContextStorageHead {
        return $this->current;
    }
    public function scope() : ?ContextStorageScopeInterface {
        return ($this->current->node->head ?? null) === $this->current ? $this->current->node : null;
    }
    public function current() : ContextInterface {
        return $this->current->node->context ?? Context::getRoot();
    }
    public function attach(ContextInterface $context) : ContextStorageScopeInterface {
        return $this->current->node = new ContextStorageNode($context, $this->current, $this->current->node);
    }
    private function __clone() {
    }

}