Cache.php in Plug 7

Namespace

Doctrine\Common\Cache

File

lib/doctrine/cache/lib/Doctrine/Common/Cache/Cache.php

<?php

/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */
namespace Doctrine\Common\Cache;


/**
 * Interface for cache drivers.
 *
 * @link   www.doctrine-project.org
 * @since  2.0
 * @author Benjamin Eberlei <[e-mail]>
 * @author Guilherme Blanco <[e-mail]>
 * @author Jonathan Wage <[e-mail]>
 * @author Roman Borschel <[e-mail]>
 * @author Fabio B. Silva <[e-mail]>
 * @author Kévin Dunglas <[e-mail]>
 */
interface Cache {
  const STATS_HITS = 'hits';
  const STATS_MISSES = 'misses';
  const STATS_UPTIME = 'uptime';
  const STATS_MEMORY_USAGE = 'memory_usage';
  const STATS_MEMORY_AVAILABLE = 'memory_available';

  /**
   * Only for backward compatibility (may be removed in next major release)
   *
   * @deprecated
   */
  const STATS_MEMORY_AVAILIABLE = 'memory_available';

  /**
   * Fetches an entry from the cache.
   *
   * @param string $id The id of the cache entry to fetch.
   *
   * @return mixed The cached data or FALSE, if no cache entry exists for the given id.
   */
  public function fetch($id);

  /**
   * Tests if an entry exists in the cache.
   *
   * @param string $id The cache id of the entry to check for.
   *
   * @return boolean TRUE if a cache entry exists for the given cache id, FALSE otherwise.
   */
  public function contains($id);

  /**
   * Puts data into the cache.
   *
   * @param string $id       The cache id.
   * @param mixed  $data     The cache entry/data.
   * @param int    $lifeTime The cache lifetime.
   *                         If != 0, sets a specific lifetime for this cache entry (0 => infinite lifeTime).
   *
   * @return boolean TRUE if the entry was successfully stored in the cache, FALSE otherwise.
   */
  public function save($id, $data, $lifeTime = 0);

  /**
   * Deletes a cache entry.
   *
   * @param string $id The cache id.
   *
   * @return boolean TRUE if the cache entry was successfully deleted, FALSE otherwise.
   */
  public function delete($id);

  /**
   * Retrieves cached information from the data store.
   *
   * The server's statistics array has the following values:
   *
   * - <b>hits</b>
   * Number of keys that have been requested and found present.
   *
   * - <b>misses</b>
   * Number of items that have been requested and not found.
   *
   * - <b>uptime</b>
   * Time that the server is running.
   *
   * - <b>memory_usage</b>
   * Memory used by this server to store items.
   *
   * - <b>memory_available</b>
   * Memory allowed to use for storage.
   *
   * @since 2.2
   *
   * @return array|null An associative array with server's statistics if available, NULL otherwise.
   */
  public function getStats();

}

Interfaces

Name	Description
Cache	Interface for cache drivers.