| | |
| | | private $type; |
| | | private $userid; |
| | | private $prefix; |
| | | private $db_readed; |
| | | private $cache = array(); |
| | | private $cache_keys = array(); |
| | | private $cache_changes = array(); |
| | | private $cache_sums = array(); |
| | | |
| | | |
| | | |
| | | /** |
| | |
| | | */ |
| | | function get($key) |
| | | { |
| | | $key = $this->prefix.$key; |
| | | |
| | | if ($this->type == 'memcache') { |
| | | return $this->read_cache_record($key); |
| | | } |
| | | |
| | | // read cache (if it was not read before) |
| | | if (!count($this->cache)) { |
| | | $do_read = true; |
| | | } |
| | | else if (isset($this->cache[$key])) { |
| | | $do_read = false; |
| | | } |
| | | // Find cache prefix, we'll load data for all keys |
| | | // with specified (class) prefix into internal cache (memory) |
| | | else if ($pos = strpos($key, '.')) { |
| | | $prefix = substr($key, 0, $pos); |
| | | $regexp = '/^' . preg_quote($prefix, '/') . '/'; |
| | | if (!count(preg_grep($regexp, array_keys($this->cache_keys)))) { |
| | | $do_read = true; |
| | | } |
| | | } |
| | | |
| | | if ($do_read) { |
| | | return $this->read_cache_record($key); |
| | | } |
| | | // read cache (if it was read before) |
| | | if (!$this->db_readed) |
| | | $this->read_cache(); |
| | | |
| | | return $this->cache[$key]; |
| | | } |
| | |
| | | */ |
| | | function set($key, $data) |
| | | { |
| | | $key = $this->prefix.$key; |
| | | |
| | | $this->cache[$key] = $data; |
| | | $this->cache_changed = true; |
| | | $this->cache_changes[$key] = true; |
| | |
| | | /** |
| | | * Clears the cache. |
| | | * |
| | | * @param string $key Cache key name or pattern |
| | | * @param boolean $pattern_mode Enable it to clear all keys with name |
| | | * matching PREG pattern in $key |
| | | * @param string $key Cache key name or pattern |
| | | * @param boolean $prefix_mode Enable it to clear all keys starting |
| | | * with prefix specified in $key |
| | | */ |
| | | function remove($key=null, $pattern_mode=false) |
| | | { |
| | | // Remove all keys |
| | | if ($key === null) { |
| | | foreach (array_keys($this->cache) as $key) |
| | | $this->clear_cache_record($key); |
| | | |
| | | $this->cache = array(); |
| | | $this->cache_changed = false; |
| | | $this->cache_changes = array(); |
| | | $this->cache_keys = array(); |
| | | $where = " AND cache_key LIKE " . $this->db->quote($this->prefix.'.%'); |
| | | } |
| | | else if ($pattern_mode) { |
| | | // add cache prefix into PCRE expression |
| | | if (preg_match('/^(.)([^a-z0-9]*).*/i', $key, $matches)) { |
| | | $key = $matches[1] . $matches[2] . preg_quote($this->prefix, $matches[1]) |
| | | . substr($key, strlen($matches[1].$matches[2])); |
| | | } |
| | | else { |
| | | $key = $this->prefix.$key; |
| | | } |
| | | |
| | | // Remove keys by name prefix |
| | | else if (!$prefix_mode) { |
| | | $this->cache[$key] = null; |
| | | $this->cache_changes[$key] = false; |
| | | unset($this->cache_keys[$key]); |
| | | $where = " AND cache_key = " . $this->db->quote($this->prefix.'.'.$key); |
| | | } |
| | | // Remove one key by name |
| | | else { |
| | | foreach (array_keys($this->cache) as $k) { |
| | | if (preg_match($key, $k)) { |
| | | $this->clear_cache_record($k); |
| | | if (strpos($k, $key) === 0) { |
| | | $this->cache[$k] = null; |
| | | $this->cache_changes[$k] = false; |
| | | unset($this->cache[$key]); |
| | | unset($this->cache_keys[$k]); |
| | | } |
| | | } |
| | | $where = " AND cache_key LIKE " . $this->db->quote($this->prefix.'.'.$key.'%'); |
| | | if (!count($this->cache)) { |
| | | $this->cache_changed = false; |
| | | } |
| | | } |
| | | else { |
| | | $key = $this->prefix.$key; |
| | | |
| | | $this->clear_cache_record($key); |
| | | $this->cache_changes[$key] = false; |
| | | unset($this->cache[$key]); |
| | | if (!$this->db) { |
| | | return; |
| | | } |
| | | |
| | | if ($this->type != 'db') { |
| | | return; |
| | | } |
| | | |
| | | $this->db->query( |
| | | "DELETE FROM ".get_table_name('cache'). |
| | | " WHERE user_id = ?" . $where, |
| | | $this->userid); |
| | | } |
| | | |
| | | |
| | |
| | | return; |
| | | } |
| | | |
| | | foreach ($this->cache as $key => $data) { |
| | | // The key has been used |
| | | if ($this->cache_changes[$key]) { |
| | | // Make sure we're not going to write unchanged data |
| | | // by comparing current md5 sum with the sum calculated on DB read |
| | | $data = serialize($data); |
| | | if (!$this->cache_sums[$key] || $this->cache_sums[$key] != md5($data)) { |
| | | $this->write_cache_record($key, $data); |
| | | } |
| | | } |
| | | } |
| | | $this->write_cache(); |
| | | } |
| | | |
| | | |
| | | /** |
| | | * Returns cached entry. |
| | | * |
| | | * @param string $key Cache key |
| | | * |
| | | * @return mixed Cached value |
| | | * Reads cache entries. |
| | | * @access private |
| | | */ |
| | | private function read_cache_record($key) |
| | | private function read_cache() |
| | | { |
| | | if (!$this->db) { |
| | | return null; |
| | | } |
| | | |
| | | if ($this->type == 'memcache') { |
| | | $data = $this->db->get($this->ckey($key)); |
| | | |
| | | if ($data) { |
| | | $this->cache_sums[$key] = md5($data); |
| | | $data = unserialize($data); |
| | | $data = $this->db->get($this->ckey()); |
| | | } |
| | | else if ($this->type == 'apc') { |
| | | $data = apc_fetch($this->ckey()); |
| | | } |
| | | |
| | | if ($data) { |
| | | $this->cache_sums['data'] = md5($data); |
| | | $data = unserialize($data); |
| | | if (is_array($data)) { |
| | | $this->cache = $data; |
| | | } |
| | | return $this->cache[$key] = $data; |
| | | } |
| | | else if ($this->type == 'db') { |
| | | // get cached data from DB |
| | | $sql_result = $this->db->query( |
| | | "SELECT cache_id, data, cache_key". |
| | | " FROM ".get_table_name('cache'). |
| | | " WHERE user_id = ?". |
| | | " AND cache_key LIKE " . $this->db->quote($this->prefix.'.%'), |
| | | $this->userid); |
| | | |
| | | if ($this->type == 'apc') { |
| | | $data = apc_fetch($this->ckey($key)); |
| | | |
| | | if ($data) { |
| | | $this->cache_sums[$key] = md5($data); |
| | | $data = unserialize($data); |
| | | } |
| | | return $this->cache[$key] = $data; |
| | | } |
| | | |
| | | // Find cache prefix, we'll load data for all keys |
| | | // with specified (class) prefix into internal cache (memory) |
| | | if ($pos = strpos($key, '.')) { |
| | | $prefix = substr($key, 0, $pos); |
| | | $where = " AND cache_key LIKE '$prefix%'"; |
| | | } |
| | | else { |
| | | $where = " AND cache_key = ".$this->db->quote($key); |
| | | } |
| | | |
| | | // get cached data from DB |
| | | $sql_result = $this->db->query( |
| | | "SELECT cache_id, data, cache_key". |
| | | " FROM ".get_table_name('cache'). |
| | | " WHERE user_id = ?".$where, |
| | | $this->userid); |
| | | |
| | | while ($sql_arr = $this->db->fetch_assoc($sql_result)) { |
| | | $sql_key = $sql_arr['cache_key']; |
| | | $this->cache_keys[$sql_key] = $sql_arr['cache_id']; |
| | | if (!isset($this->cache[$sql_key])) { |
| | | while ($sql_arr = $this->db->fetch_assoc($sql_result)) { |
| | | $key = substr($sql_arr['cache_key'], strlen($this->prefix)+1); |
| | | $md5sum = $sql_arr['data'] ? md5($sql_arr['data']) : null; |
| | | $data = $sql_arr['data'] ? unserialize($sql_arr['data']) : false; |
| | | $this->cache[$sql_key] = $data; |
| | | $this->cache_sums[$sql_key] = $md5sum; |
| | | $data = $sql_arr['data'] ? unserialize($sql_arr['data']) : null; |
| | | $this->cache[$key] = $data; |
| | | $this->cache_sums[$key] = $md5sum; |
| | | $this->cache_keys[$key] = $sql_arr['cache_id']; |
| | | } |
| | | } |
| | | |
| | | return $this->cache[$key]; |
| | | $this->db_readed = true; |
| | | } |
| | | |
| | | |
| | | /** |
| | | * Writes single cache record. |
| | | * Writes the cache content into DB. |
| | | * |
| | | * @param string $key Cache key |
| | | * @param mxied $data Cache value |
| | | * @return boolean Write result |
| | | * @access private |
| | | */ |
| | | private function write_cache_record($key, $data) |
| | | private function write_cache() |
| | | { |
| | | if (!$this->db) { |
| | | return false; |
| | | } |
| | | |
| | | if ($this->type == 'memcache') { |
| | | $key = $this->ckey($key); |
| | | $result = $this->db->replace($key, $data, MEMCACHE_COMPRESSED); |
| | | if (!$result) |
| | | $result = $this->db->set($key, $data, MEMCACHE_COMPRESSED); |
| | | return $result; |
| | | if ($this->type == 'memcache' || $this->type == 'apc') { |
| | | // remove nulls |
| | | foreach ($this->cache as $idx => $value) { |
| | | if ($value === null) |
| | | unset($this->cache[$idx]); |
| | | } |
| | | |
| | | $data = serialize($this->cache); |
| | | $key = $this->ckey(); |
| | | |
| | | // Don't save the data if nothing changed |
| | | if ($this->cache_sums['data'] && $this->cache_sums['data'] == md5($data)) { |
| | | return true; |
| | | } |
| | | |
| | | if ($this->type == 'memcache') { |
| | | $result = $this->db->replace($key, $data, MEMCACHE_COMPRESSED); |
| | | if (!$result) |
| | | $result = $this->db->set($key, $data, MEMCACHE_COMPRESSED); |
| | | return $result; |
| | | } |
| | | |
| | | if ($this->type == 'apc') { |
| | | if (apc_exists($key)) |
| | | apc_delete($key); |
| | | return apc_store($key, $data); |
| | | } |
| | | } |
| | | |
| | | if ($this->type == 'apc') { |
| | | $key = $this->ckey($key); |
| | | if (apc_exists($key)) |
| | | apc_delete($key); |
| | | return apc_store($key, $data); |
| | | foreach ($this->cache as $key => $data) { |
| | | // The key has been used |
| | | if ($this->cache_changes[$key]) { |
| | | // Make sure we're not going to write unchanged data |
| | | // by comparing current md5 sum with the sum calculated on DB read |
| | | $data = serialize($data); |
| | | |
| | | if (!$this->cache_sums[$key] || $this->cache_sums[$key] != md5($data)) { |
| | | $this->write_record($key, $data); |
| | | } |
| | | } |
| | | } |
| | | |
| | | return true; |
| | | } |
| | | |
| | | |
| | | /** |
| | | * Writes single cache record into SQL database. |
| | | * |
| | | * @param string $key Cache key |
| | | * @param mxied $data Cache value |
| | | * @access private |
| | | */ |
| | | private function write_record($key, $data) |
| | | { |
| | | if (!$this->db) { |
| | | return false; |
| | | } |
| | | |
| | | // update existing cache record |
| | |
| | | " SET created = ". $this->db->now().", data = ?". |
| | | " WHERE user_id = ?". |
| | | " AND cache_key = ?", |
| | | $data, $this->userid, $key); |
| | | $data, $this->userid, $this->prefix . '.' . $key); |
| | | } |
| | | // add new cache record |
| | | else { |
| | |
| | | "INSERT INTO ".get_table_name('cache'). |
| | | " (created, user_id, cache_key, data)". |
| | | " VALUES (".$this->db->now().", ?, ?, ?)", |
| | | $this->userid, $key, $data); |
| | | |
| | | // get cache entry ID for this key |
| | | $sql_result = $this->db->query( |
| | | "SELECT cache_id". |
| | | " FROM ".get_table_name('cache'). |
| | | " WHERE user_id = ?". |
| | | " AND cache_key = ?", |
| | | $this->userid, $key); |
| | | |
| | | if ($sql_arr = $this->db->fetch_assoc($sql_result)) |
| | | $this->cache_keys[$key] = $sql_arr['cache_id']; |
| | | $this->userid, $this->prefix . '.' . $key, $data); |
| | | } |
| | | } |
| | | |
| | | |
| | | /** |
| | | * Clears cache for single record. |
| | | * |
| | | * @param string $key Cache key |
| | | * @access private |
| | | */ |
| | | private function clear_cache_record($key) |
| | | { |
| | | if (!$this->db) { |
| | | return false; |
| | | } |
| | | |
| | | if ($this->type == 'memcache') { |
| | | return $this->db->delete($this->ckey($key)); |
| | | } |
| | | |
| | | if ($this->type == 'apc') { |
| | | return apc_delete($this->ckey($key)); |
| | | } |
| | | |
| | | $this->db->query( |
| | | "DELETE FROM ".get_table_name('cache'). |
| | | " WHERE user_id = ?". |
| | | " AND cache_key = ?", |
| | | $this->userid, $key); |
| | | |
| | | unset($this->cache_keys[$key]); |
| | | } |
| | | |
| | | |
| | | /** |
| | | * Creates per-user cache key (for memcache and apc) |
| | | * |
| | | * @param string $key Cache key |
| | | * @return string Cache key |
| | | * @access private |
| | | */ |
| | | private function ckey($key) |
| | | private function ckey() |
| | | { |
| | | return sprintf('[%d]%s', $this->userid, $key); |
| | | return sprintf('%d-%s', $this->userid, $this->prefix); |
| | | } |
| | | } |