ScopedLock.php

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<?php
class ScopedLock {
        protected $manager;
        protected $status;
        protected $paths;

        protected $type; // integer lock type

        protected function __construct(
                LockManager $manager, array $paths, $type, Status $status
        ) {
                $this->manager = $manager;
                $this->paths = $paths;
                $this->status = $status;
                $this->type = $type;
        }

        public static function factory(
                LockManager $manager, array $paths, $type, Status $status
        ) {
                $lockStatus = $manager->lock( $paths, $type );
                $status->merge( $lockStatus );
                if ( $lockStatus->isOK() ) {
                        return new self( $manager, $paths, $type, $status );
                }
                return null;
        }

        public static function release( ScopedLock &$lock = null ) {
                $lock = null;
        }

        function __destruct() {
                $wasOk = $this->status->isOK();
                $this->status->merge( $this->manager->unlock( $this->paths, $this->type ) );
                if ( $wasOk ) {
                        // Make sure status is OK, despite any unlockFiles() fatals
                        $this->status->setResult( true, $this->status->value );
                }
        }
}