* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\HttpFoundation\Session\Storage\Handler; /** * Wraps another SessionHandlerInterface to only write the session when it has been modified. * * @author Adrien Brault */ class WriteCheckSessionHandler implements \SessionHandlerInterface { /** * @var \SessionHandlerInterface */ private $wrappedSessionHandler; /** * @var array sessionId => session */ private $readSessions; public function __construct(\SessionHandlerInterface $wrappedSessionHandler) { $this->wrappedSessionHandler = $wrappedSessionHandler; } /** * {@inheritdoc} */ public function close() { return $this->wrappedSessionHandler->close(); } /** * {@inheritdoc} */ public function destroy($sessionId) { return $this->wrappedSessionHandler->destroy($sessionId); } /** * {@inheritdoc} */ public function gc($maxLifetime) { return $this->wrappedSessionHandler->gc($maxLifetime); } /** * {@inheritdoc} */ public function open($savePath, $sessionId) { return $this->wrappedSessionHandler->open($savePath, $sessionId); } /** * {@inheritdoc} */ public function read($sessionId) { $session = $this->wrappedSessionHandler->read($sessionId); $this->readSessions[$sessionId] = $session; return $session; } /** * {@inheritdoc} */ public function write($sessionId, $sessionData) { if (isset($this->readSessions[$sessionId]) && $sessionData === $this->readSessions[$sessionId]) { return true; } return $this->wrappedSessionHandler->write($sessionId, $sessionData); } }