radar-wp/vendor/doctrine/common/lib/Doctrine/Common/Cache/CacheProvider.php

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2015-02-24 16:25:12 +01:00
<?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;
/**
* Base class for cache provider implementations.
*
* @since 2.2
* @author Benjamin Eberlei <kontakt@beberlei.de>
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Jonathan Wage <jonwage@gmail.com>
* @author Roman Borschel <roman@code-factory.org>
* @author Fabio B. Silva <fabio.bat.silva@gmail.com>
*/
abstract class CacheProvider implements Cache
{
const DOCTRINE_NAMESPACE_CACHEKEY = 'DoctrineNamespaceCacheKey[%s]';
/**
* @var string The namespace to prefix all cache ids with
*/
private $namespace = '';
/**
* @var string The namespace version
*/
private $namespaceVersion;
/**
* Set the namespace to prefix all cache ids with.
*
* @param string $namespace
* @return void
*/
public function setNamespace($namespace)
{
$this->namespace = (string) $namespace;
}
/**
* Retrieve the namespace that prefixes all cache ids.
*
* @return string
*/
public function getNamespace()
{
return $this->namespace;
}
/**
* {@inheritdoc}
*/
public function fetch($id)
{
return $this->doFetch($this->getNamespacedId($id));
}
/**
* {@inheritdoc}
*/
public function contains($id)
{
return $this->doContains($this->getNamespacedId($id));
}
/**
* {@inheritdoc}
*/
public function save($id, $data, $lifeTime = 0)
{
return $this->doSave($this->getNamespacedId($id), $data, $lifeTime);
}
/**
* {@inheritdoc}
*/
public function delete($id)
{
return $this->doDelete($this->getNamespacedId($id));
}
/**
* {@inheritdoc}
*/
public function getStats()
{
return $this->doGetStats();
}
/**
* Deletes all cache entries.
*
* @return boolean TRUE if the cache entries were successfully flushed, FALSE otherwise.
*/
public function flushAll()
{
return $this->doFlush();
}
/**
* Delete all cache entries.
*
* @return boolean TRUE if the cache entries were successfully deleted, FALSE otherwise.
*/
public function deleteAll()
{
$namespaceCacheKey = $this->getNamespaceCacheKey();
$namespaceVersion = $this->getNamespaceVersion() + 1;
$this->namespaceVersion = $namespaceVersion;
return $this->doSave($namespaceCacheKey, $namespaceVersion);
}
/**
* Prefix the passed id with the configured namespace value
*
* @param string $id The id to namespace
* @return string $id The namespaced id
*/
private function getNamespacedId($id)
{
$namespaceVersion = $this->getNamespaceVersion();
return sprintf('%s[%s][%s]', $this->namespace, $id, $namespaceVersion);
}
/**
* Namespace cache key
*
* @return string $namespaceCacheKey
*/
private function getNamespaceCacheKey()
{
return sprintf(self::DOCTRINE_NAMESPACE_CACHEKEY, $this->namespace);
}
/**
* Namespace version
*
* @return string $namespaceVersion
*/
private function getNamespaceVersion()
{
if (null !== $this->namespaceVersion) {
return $this->namespaceVersion;
}
$namespaceCacheKey = $this->getNamespaceCacheKey();
$namespaceVersion = $this->doFetch($namespaceCacheKey);
if (false === $namespaceVersion) {
$namespaceVersion = 1;
$this->doSave($namespaceCacheKey, $namespaceVersion);
}
$this->namespaceVersion = $namespaceVersion;
return $this->namespaceVersion;
}
/**
* Fetches an entry from the cache.
*
* @param string $id cache id The id of the cache entry to fetch.
* @return string The cached data or FALSE, if no cache entry exists for the given id.
*/
abstract protected function doFetch($id);
/**
* Test if an entry exists in the cache.
*
* @param string $id cache id The cache id of the entry to check for.
* @return boolean TRUE if a cache entry exists for the given cache id, FALSE otherwise.
*/
abstract protected function doContains($id);
/**
* Puts data into the cache.
*
* @param string $id The cache id.
* @param string $data The cache entry/data.
* @param bool|int $lifeTime The lifetime. If != false, sets a specific lifetime for this
* cache entry (null => infinite lifeTime).
*
* @return boolean TRUE if the entry was successfully stored in the cache, FALSE otherwise.
*/
abstract protected function doSave($id, $data, $lifeTime = false);
/**
* Deletes a cache entry.
*
* @param string $id cache id
* @return boolean TRUE if the cache entry was successfully deleted, FALSE otherwise.
*/
abstract protected function doDelete($id);
/**
* Deletes all cache entries.
*
* @return boolean TRUE if the cache entry was successfully deleted, FALSE otherwise.
*/
abstract protected function doFlush();
/**
* Retrieves cached information from data store
*
* @since 2.2
* @return array An associative array with server's statistics if available, NULL otherwise.
*/
abstract protected function doGetStats();
}