/**
* Pulls data out of cache.
* Also, it checks all related tags for expiration/version-up.
*
* @see sfCache::get
* @param string $key
* @param mixed $default returned back if result is false
* @return mixed
*/
public function get($key, $default = null)
{
$cacheMetadata = new CacheMetadata($this->getCache()->get($key, $default));
$data = $cacheMetadata->getData();
if (null !== $data) {
$fetchedCacheTags = $cacheMetadata->getTags();
if (0 !== count($fetchedCacheTags)) {
/**
* speed up multi tag selection from backend
*/
$tagKeys = array_keys($fetchedCacheTags);
$storedTags = $this->getCache()->getMany($tagKeys);
$hasExpired = false;
/**
* getMany returns keys with NULL value if some key is missing.
* In case arrays are equal, cache is not expired
*/
if ($fetchedCacheTags === $storedTags) {
$this->getLogger()->log('V', 'via equal compare');
# one tag is expired, no reasons to continue
# (should revalidate cache data)
} else {
$extendedKeysWithCurrentVersions = array_combine(array_keys($storedTags), array_values($fetchedCacheTags));
# check for data tags is expired
foreach ($storedTags as $tagKey => $tagLatestVersion) {
$tagVersion = $extendedKeysWithCurrentVersions[$tagKey];
# tag is exprired or version is old
if (!$tagLatestVersion || $tagVersion < $tagLatestVersion) {
$this->getLogger()->log('v', sprintf('%s(%s=>%s)', $tagKey, $tagVersion, $tagLatestVersion));
# one tag is expired, no reasons to continue
# (should revalidate cache data)
$hasExpired = true;
break;
}
$this->getLogger()->log('V', sprintf('%s(%s)', $tagKey, $tagLatestVersion));
}
}
// some cache tags is invalidated
if ($hasExpired) {
if ($this->isLocked($key)) {
# return old cache coz new data is writing to the current cache
$data = $cacheMetadata->getData();
} else {
# cache no locked, but cache is expired
$data = null;
}
} else {
$data = $cacheMetadata->getData();
}
} else {
$data = $cacheMetadata->getData();
}
}
$this->getLogger()->log($data !== $default ? 'G' : 'g', $key);
return $data;
}
/**
* Listens to the 'view.cache.filter_content' event to decorate a chunk of HTML with cache information.
*
* Added info about linked tags
*
* @param sfEvent $event A sfEvent instance
* @param string $content The HTML content
*
* @return string The decorated HTML string
*/
public function decorateContentWithDebug(sfEvent $event, $content)
{
$updatedContent = parent::decorateContentWithDebug($event, $content);
if ($content === $updatedContent) {
return $content;
}
$cacheMetadata = new CacheMetadata($this->getCache()->get($this->generateCacheKey($event['uri'])));
if (null === $cacheMetadata->getData()) {
return $content;
}
$tags = $cacheMetadata->getTags();
ksort($tags, SORT_ASC);
$tagsCount = count($tags);
$tagsContent = sprintf('[cache tags] count: %d', $tagsCount);
if (0 != $tagsCount) {
$tagsContent .= ', tags:';
foreach ($tags as $name => $version) {
$tagsContent .= sprintf(' <span title="%s">%s</span>,', htmlspecialchars($version, ENT_QUOTES, sfConfig::get('sf_charset')), htmlspecialchars($name, ENT_QUOTES, sfConfig::get('sf_charset')));
}
$tagsContent = substr($tagsContent, 0, -1) . '.';
}
$textToReplace = ' <br /> ';
return str_replace($textToReplace, $tagsContent, $updatedContent);
}