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<?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;
/**
* Cache provider that allows to easily chain multiple cache providers
*
* @author Michaël Gallego <mic.gallego@gmail.com>
*/
class ChainCache extends CacheProvider
{
/**
* @var CacheProvider[]
*/
private $cacheProviders = array();
/**
* Constructor
*
* @param CacheProvider[] $cacheProviders
*/
public function __construct($cacheProviders = array())
{
$this->cacheProviders = $cacheProviders;
}
/**
* {@inheritDoc}
*/
public function setNamespace($namespace)
{
parent::setNamespace($namespace);
foreach ($this->cacheProviders as $cacheProvider) {
$cacheProvider->setNamespace($namespace);
}
}
/**
* {@inheritDoc}
*/
protected function doFetch($id)
{
foreach ($this->cacheProviders as $key => $cacheProvider) {
if ($cacheProvider->doContains($id)) {
$value = $cacheProvider->doFetch($id);
// We populate all the previous cache layers (that are assumed to be faster)
for ($subKey = $key - 1 ; $subKey >= 0 ; $subKey--) {
$this->cacheProviders[$subKey]->doSave($id, $value);
}
return $value;
}
}
return false;
}
/**
* {@inheritDoc}
*/
protected function doContains($id)
{
foreach ($this->cacheProviders as $cacheProvider) {
if ($cacheProvider->doContains($id)) {
return true;
}
}
return false;
}
/**
* {@inheritDoc}
*/
protected function doSave($id, $data, $lifeTime = 0)
{
$stored = true;
foreach ($this->cacheProviders as $cacheProvider) {
$stored = $cacheProvider->doSave($id, $data, $lifeTime) && $stored;
}
return $stored;
}
/**
* {@inheritDoc}
*/
protected function doDelete($id)
{
$deleted = true;
foreach ($this->cacheProviders as $cacheProvider) {
$deleted = $cacheProvider->doDelete($id) && $deleted;
}
return $deleted;
}
/**
* {@inheritDoc}
*/
protected function doFlush()
{
$flushed = true;
foreach ($this->cacheProviders as $cacheProvider) {
$flushed = $cacheProvider->doFlush() && $flushed;
}
return $flushed;
}
/**
* {@inheritDoc}
*/
protected function doGetStats()
{
// We return all the stats from all adapters
$stats = array();
foreach ($this->cacheProviders as $cacheProvider) {
$stats[] = $cacheProvider->doGetStats();
}
return $stats;
}
}
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