AssetCache.php
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<?php
/*
* This file is part of the Assetic package, an OpenSky project.
*
* (c) 2010-2014 OpenSky Project Inc
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Assetic\Asset;
use Assetic\Cache\CacheInterface;
use Assetic\Filter\FilterInterface;
use Assetic\Filter\HashableInterface;
/**
* Caches an asset to avoid the cost of loading and dumping.
*
* @author Kris Wallsmith <kris.wallsmith@gmail.com>
*/
class AssetCache implements AssetInterface
{
private $asset;
private $cache;
public function __construct(AssetInterface $asset, CacheInterface $cache)
{
$this->asset = $asset;
$this->cache = $cache;
}
public function ensureFilter(FilterInterface $filter)
{
$this->asset->ensureFilter($filter);
}
public function getFilters()
{
return $this->asset->getFilters();
}
public function clearFilters()
{
$this->asset->clearFilters();
}
public function load(FilterInterface $additionalFilter = null)
{
$cacheKey = self::getCacheKey($this->asset, $additionalFilter, 'load');
if ($this->cache->has($cacheKey)) {
$this->asset->setContent($this->cache->get($cacheKey));
return;
}
$this->asset->load($additionalFilter);
$this->cache->set($cacheKey, $this->asset->getContent());
}
public function dump(FilterInterface $additionalFilter = null)
{
$cacheKey = self::getCacheKey($this->asset, $additionalFilter, 'dump');
if ($this->cache->has($cacheKey)) {
return $this->cache->get($cacheKey);
}
$content = $this->asset->dump($additionalFilter);
$this->cache->set($cacheKey, $content);
return $content;
}
public function getContent()
{
return $this->asset->getContent();
}
public function setContent($content)
{
$this->asset->setContent($content);
}
public function getSourceRoot()
{
return $this->asset->getSourceRoot();
}
public function getSourcePath()
{
return $this->asset->getSourcePath();
}
public function getSourceDirectory()
{
return $this->asset->getSourceDirectory();
}
public function getTargetPath()
{
return $this->asset->getTargetPath();
}
public function setTargetPath($targetPath)
{
$this->asset->setTargetPath($targetPath);
}
public function getLastModified()
{
return $this->asset->getLastModified();
}
public function getVars()
{
return $this->asset->getVars();
}
public function setValues(array $values)
{
$this->asset->setValues($values);
}
public function getValues()
{
return $this->asset->getValues();
}
/**
* Returns a cache key for the current asset.
*
* The key is composed of everything but an asset's content:
*
* * source root
* * source path
* * target url
* * last modified
* * filters
*
* @param AssetInterface $asset The asset
* @param FilterInterface $additionalFilter Any additional filter being applied
* @param string $salt Salt for the key
*
* @return string A key for identifying the current asset
*/
private static function getCacheKey(AssetInterface $asset, FilterInterface $additionalFilter = null, $salt = '')
{
if ($additionalFilter) {
$asset = clone $asset;
$asset->ensureFilter($additionalFilter);
}
$cacheKey = $asset->getSourceRoot();
$cacheKey .= $asset->getSourcePath();
$cacheKey .= $asset->getTargetPath();
$cacheKey .= $asset->getLastModified();
foreach ($asset->getFilters() as $filter) {
if ($filter instanceof HashableInterface) {
$cacheKey .= $filter->hash();
} else {
$cacheKey .= serialize($filter);
}
}
if ($values = $asset->getValues()) {
asort($values);
$cacheKey .= serialize($values);
}
return md5($cacheKey.$salt);
}
}