/**
* Save some string datas into a cache record
*
* Note : $data is always "string" (serialization is done by the
* core not by the backend)
*
* @param string $data Datas to cache
* @param string $id Cache id
* @param array $tags Array of strings, the cache record will be tagged by each string entry
* @param bool|int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
* @throws Exception
* @return boolean True if no problem
*/
public function save($data, $id, $tags = array(), $specificLifetime = false)
{
if (!is_array($tags)) {
$tags = $tags ? array($tags) : array();
}
$lifetime = $this->getLifetime($specificLifetime);
// Get list of tags previously assigned
$oldTags = $this->_decodeData($this->_redis->hGet(self::PREFIX_KEY . $id, self::FIELD_TAGS));
$oldTags = $oldTags ? explode(',', $oldTags) : array();
//$this->_redis->pipeline()->multi();
// Set the data
$result = $this->_redis->hMSet(self::PREFIX_KEY . $id, array(self::FIELD_DATA => $this->_encodeData($data, $this->_compressData), self::FIELD_TAGS => $this->_encodeData(implode(',', $tags), $this->_compressTags), self::FIELD_MTIME => time(), self::FIELD_INF => $lifetime ? 0 : 1));
if (!$result) {
throw new Exception("Could not set cache key {$id}");
}
// Set expiration if specified
if ($lifetime) {
$this->_redis->expire(self::PREFIX_KEY . $id, min($lifetime, self::MAX_LIFETIME));
}
// Process added tags
if ($tags) {
// Update the list with all the tags
$this->_redis->sAdd(self::SET_TAGS, $tags);
// Update the id list for each tag
foreach ($tags as $tag) {
$this->_redis->sAdd(self::PREFIX_TAG_IDS . $tag, $id);
}
}
// Process removed tags
if ($remTags = $oldTags ? array_diff($oldTags, $tags) : FALSE) {
// Update the id list for each tag
foreach ($remTags as $tag) {
$this->_redis->sRem(self::PREFIX_TAG_IDS . $tag, $id);
}
}
// Update the list with all the ids
if ($this->_notMatchingTags) {
$this->_redis->sAdd(self::SET_IDS, $id);
}
//$this->_redis->exec();
return TRUE;
}