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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
  13  
  14  /**
  15   * Wraps another SessionHandlerInterface to only write the session when it has been modified.
  16   *
  17   * @author Adrien Brault <adrien.brault@gmail.com>
  18   */
  19  class WriteCheckSessionHandler implements \SessionHandlerInterface
  20  {
  21      private $wrappedSessionHandler;
  22  
  23      /**
  24       * @var array sessionId => session
  25       */
  26      private $readSessions;
  27  
  28      public function __construct(\SessionHandlerInterface $wrappedSessionHandler)
  29      {
  30          $this->wrappedSessionHandler = $wrappedSessionHandler;
  31      }
  32  
  33      /**
  34       * {@inheritdoc}
  35       */
  36      public function close()
  37      {
  38          return $this->wrappedSessionHandler->close();
  39      }
  40  
  41      /**
  42       * {@inheritdoc}
  43       */
  44      public function destroy($sessionId)
  45      {
  46          return $this->wrappedSessionHandler->destroy($sessionId);
  47      }
  48  
  49      /**
  50       * {@inheritdoc}
  51       */
  52      public function gc($maxlifetime)
  53      {
  54          return $this->wrappedSessionHandler->gc($maxlifetime);
  55      }
  56  
  57      /**
  58       * {@inheritdoc}
  59       */
  60      public function open($savePath, $sessionName)
  61      {
  62          return $this->wrappedSessionHandler->open($savePath, $sessionName);
  63      }
  64  
  65      /**
  66       * {@inheritdoc}
  67       */
  68      public function read($sessionId)
  69      {
  70          $session = $this->wrappedSessionHandler->read($sessionId);
  71  
  72          $this->readSessions[$sessionId] = $session;
  73  
  74          return $session;
  75      }
  76  
  77      /**
  78       * {@inheritdoc}
  79       */
  80      public function write($sessionId, $data)
  81      {
  82          if (isset($this->readSessions[$sessionId]) && $data === $this->readSessions[$sessionId]) {
  83              return true;
  84          }
  85  
  86          return $this->wrappedSessionHandler->write($sessionId, $data);
  87      }
  88  }