From 50abd557184326f173357b50e7593dc3f452be91 Mon Sep 17 00:00:00 2001 From: Aleksander Machniak Date: Sat, 25 May 2013 15:37:46 +0200 Subject: Added shared (cross-user) cache --- CHANGELOG | 1 + SQL/mssql.initial.sql | 19 +- SQL/mssql/2013052500.sql | 17 + SQL/mysql.initial.sql | 13 +- SQL/mysql/2013052500.sql | 7 + SQL/postgres.initial.sql | 16 +- SQL/postgres/2013052500.sql | 8 + SQL/sqlite.initial.sql | 64 ++-- SQL/sqlite/2013052500.sql | 8 + program/lib/Roundcube/rcube.php | 31 ++ program/lib/Roundcube/rcube_cache_shared.php | 544 +++++++++++++++++++++++++++ 11 files changed, 688 insertions(+), 40 deletions(-) create mode 100644 SQL/mssql/2013052500.sql create mode 100644 SQL/mysql/2013052500.sql create mode 100644 SQL/postgres/2013052500.sql create mode 100644 SQL/sqlite/2013052500.sql create mode 100644 program/lib/Roundcube/rcube_cache_shared.php diff --git a/CHANGELOG b/CHANGELOG index 2709373d5..18f26ba56 100644 --- a/CHANGELOG +++ b/CHANGELOG @@ -1,6 +1,7 @@ CHANGELOG Roundcube Webmail =========================== +- Implemented shared cache (rcube_cache_shared) - Fix handling of comma when adding contact from contacts widget (#1489107) - Fix bug where a message was opened in both preview pane and new window on double-click (#1489122) - Fix fatal error when xdebug.max_nesting_level was exceeded in rcube_washtml (#1489110) diff --git a/SQL/mssql.initial.sql b/SQL/mssql.initial.sql index d43676ff9..23e7c7d7f 100644 --- a/SQL/mssql.initial.sql +++ b/SQL/mssql.initial.sql @@ -6,6 +6,13 @@ CREATE TABLE [dbo].[cache] ( ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] GO +CREATE TABLE [dbo].[cache_shared] ( + [cache_key] [varchar] (255) COLLATE Latin1_General_CI_AI NOT NULL , + [created] [datetime] NOT NULL , + [data] [text] COLLATE Latin1_General_CI_AI NOT NULL +) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] +GO + CREATE TABLE [dbo].[cache_index] ( [user_id] [int] NOT NULL , [mailbox] [varchar] (128) COLLATE Latin1_General_CI_AI NOT NULL , @@ -213,6 +220,16 @@ GO CREATE INDEX [IX_cache_created] ON [dbo].[cache]([created]) ON [PRIMARY] GO +ALTER TABLE [dbo].[cache_shared] ADD + CONSTRAINT [DF_cache_shared_created] DEFAULT (getdate()) FOR [created] +GO + +CREATE INDEX [IX_cache_shared_cache_key] ON [dbo].[cache_shared]([cache_key]) ON [PRIMARY] +GO + +CREATE INDEX [IX_cache_shared_created] ON [dbo].[cache_shared]([created]) ON [PRIMARY] +GO + ALTER TABLE [dbo].[cache_index] ADD CONSTRAINT [DF_cache_index_changed] DEFAULT (getdate()) FOR [changed], CONSTRAINT [DF_cache_index_valid] DEFAULT ('0') FOR [valid] @@ -371,6 +388,6 @@ CREATE TRIGGER [contact_delete_member] ON [dbo].[contacts] WHERE [contact_id] IN (SELECT [contact_id] FROM deleted) GO -INSERT INTO [dbo].[system] ([name], [value]) VALUES ('roundcube-version', '2013042700') +INSERT INTO [dbo].[system] ([name], [value]) VALUES ('roundcube-version', '2013052500') GO \ No newline at end of file diff --git a/SQL/mssql/2013052500.sql b/SQL/mssql/2013052500.sql new file mode 100644 index 000000000..6a7e31d46 --- /dev/null +++ b/SQL/mssql/2013052500.sql @@ -0,0 +1,17 @@ +CREATE TABLE [dbo].[cache_shared] ( + [cache_key] [varchar] (255) COLLATE Latin1_General_CI_AI NOT NULL , + [created] [datetime] NOT NULL , + [data] [text] COLLATE Latin1_General_CI_AI NOT NULL +) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] +GO + +ALTER TABLE [dbo].[cache_shared] ADD + CONSTRAINT [DF_cache_shared_created] DEFAULT (getdate()) FOR [created] +GO + +CREATE INDEX [IX_cache_shared_cache_key] ON [dbo].[cache_shared]([cache_key]) ON [PRIMARY] +GO + +CREATE INDEX [IX_cache_shared_created] ON [dbo].[cache_shared]([created]) ON [PRIMARY] +GO + diff --git a/SQL/mysql.initial.sql b/SQL/mysql.initial.sql index 5a86dd8f8..75268ca03 100644 --- a/SQL/mysql.initial.sql +++ b/SQL/mysql.initial.sql @@ -45,6 +45,17 @@ CREATE TABLE `cache` ( ) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */; +-- Table structure for table `cache_shared` + +CREATE TABLE `cache_shared` ( + `cache_key` varchar(255) /*!40101 CHARACTER SET ascii COLLATE ascii_general_ci */ NOT NULL , + `created` datetime NOT NULL DEFAULT '1000-01-01 00:00:00', + `data` longtext NOT NULL, + INDEX `created_index` (`created`), + INDEX `cache_key_index` (`cache_key`) +) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */; + + -- Table structure for table `cache_index` CREATE TABLE `cache_index` ( @@ -196,4 +207,4 @@ CREATE TABLE `system` ( /*!40014 SET FOREIGN_KEY_CHECKS=1 */; -INSERT INTO system (name, value) VALUES ('roundcube-version', '2013042700'); +INSERT INTO system (name, value) VALUES ('roundcube-version', '2013052500'); diff --git a/SQL/mysql/2013052500.sql b/SQL/mysql/2013052500.sql new file mode 100644 index 000000000..b5f72b8ab --- /dev/null +++ b/SQL/mysql/2013052500.sql @@ -0,0 +1,7 @@ +CREATE TABLE `cache_shared` ( + `cache_key` varchar(255) /*!40101 CHARACTER SET ascii COLLATE ascii_general_ci */ NOT NULL, + `created` datetime NOT NULL DEFAULT '1000-01-01 00:00:00', + `data` longtext NOT NULL, + INDEX `created_index` (`created`), + INDEX `cache_key_index` (`cache_key`) +) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */; diff --git a/SQL/postgres.initial.sql b/SQL/postgres.initial.sql index f3b368f7d..c54f05f0b 100644 --- a/SQL/postgres.initial.sql +++ b/SQL/postgres.initial.sql @@ -173,6 +173,20 @@ CREATE TABLE "cache" ( CREATE INDEX cache_user_id_idx ON "cache" (user_id, cache_key); CREATE INDEX cache_created_idx ON "cache" (created); +-- +-- Table "cache_shared" +-- Name: cache_shared; Type: TABLE; Schema: public; Owner: postgres +-- + +CREATE TABLE "cache_shared" ( + cache_key varchar(255) NOT NULL, + created timestamp with time zone DEFAULT now() NOT NULL, + data text NOT NULL +); + +CREATE INDEX cache_shared_cache_key_idx ON "cache_shared" (cache_key); +CREATE INDEX cache_shared_created_idx ON "cache_shared" (created); + -- -- Table "cache_index" -- Name: cache_index; Type: TABLE; Schema: public; Owner: postgres @@ -274,4 +288,4 @@ CREATE TABLE "system" ( value text ); -INSERT INTO system (name, value) VALUES ('roundcube-version', '2013042700'); +INSERT INTO system (name, value) VALUES ('roundcube-version', '2013052500'); diff --git a/SQL/postgres/2013052500.sql b/SQL/postgres/2013052500.sql new file mode 100644 index 000000000..471e57176 --- /dev/null +++ b/SQL/postgres/2013052500.sql @@ -0,0 +1,8 @@ +CREATE TABLE "cache_shared" ( + cache_key varchar(255) NOT NULL, + created timestamp with time zone DEFAULT now() NOT NULL, + data text NOT NULL +); + +CREATE INDEX cache_shared_cache_key_idx ON "cache_shared" (cache_key); +CREATE INDEX cache_shared_created_idx ON "cache_shared" (created); diff --git a/SQL/sqlite.initial.sql b/SQL/sqlite.initial.sql index d9bafb7e0..1b5b62b31 100644 --- a/SQL/sqlite.initial.sql +++ b/SQL/sqlite.initial.sql @@ -1,22 +1,5 @@ -- Roundcube Webmail initial database structure --- --- Table structure for table cache --- - -CREATE TABLE cache ( - user_id integer NOT NULL default 0, - cache_key varchar(128) NOT NULL default '', - created datetime NOT NULL default '0000-00-00 00:00:00', - data text NOT NULL -); - -CREATE INDEX ix_cache_user_cache_key ON cache(user_id, cache_key); -CREATE INDEX ix_cache_created ON cache(created); - - --- -------------------------------------------------------- - -- -- Table structure for table contacts and related -- @@ -57,9 +40,6 @@ CREATE TABLE contactgroupmembers ( CREATE INDEX ix_contactgroupmembers_contact_id ON contactgroupmembers (contact_id); - --- -------------------------------------------------------- - -- -- Table structure for table identities -- @@ -82,9 +62,6 @@ CREATE TABLE identities ( CREATE INDEX ix_identities_user_id ON identities(user_id, del); CREATE INDEX ix_identities_email ON identities(email, del); - --- -------------------------------------------------------- - -- -- Table structure for table users -- @@ -101,8 +78,6 @@ CREATE TABLE users ( CREATE UNIQUE INDEX ix_users_username ON users(username, mail_host); --- -------------------------------------------------------- - -- -- Table structure for table session -- @@ -117,8 +92,6 @@ CREATE TABLE session ( CREATE INDEX ix_session_changed ON session (changed); --- -------------------------------------------------------- - -- -- Table structure for table dictionary -- @@ -131,8 +104,6 @@ CREATE TABLE dictionary ( CREATE UNIQUE INDEX ix_dictionary_user_language ON dictionary (user_id, "language"); --- -------------------------------------------------------- - -- -- Table structure for table searches -- @@ -147,7 +118,32 @@ CREATE TABLE searches ( CREATE UNIQUE INDEX ix_searches_user_type_name ON searches (user_id, type, name); --- -------------------------------------------------------- +-- +-- Table structure for table cache +-- + +CREATE TABLE cache ( + user_id integer NOT NULL default 0, + cache_key varchar(128) NOT NULL default '', + created datetime NOT NULL default '0000-00-00 00:00:00', + data text NOT NULL +); + +CREATE INDEX ix_cache_user_cache_key ON cache(user_id, cache_key); +CREATE INDEX ix_cache_created ON cache(created); + +-- +-- Table structure for table cache_shared +-- + +CREATE TABLE cache_shared ( + cache_key varchar(255) NOT NULL, + created datetime NOT NULL default '0000-00-00 00:00:00', + data text NOT NULL +); + +CREATE INDEX ix_cache_shared_cache_key ON cache_shared(cache_key); +CREATE INDEX ix_cache_shared_created ON cache_shared(created); -- -- Table structure for table cache_index @@ -164,8 +160,6 @@ CREATE TABLE cache_index ( CREATE INDEX ix_cache_index_changed ON cache_index (changed); --- -------------------------------------------------------- - -- -- Table structure for table cache_thread -- @@ -180,8 +174,6 @@ CREATE TABLE cache_thread ( CREATE INDEX ix_cache_thread_changed ON cache_thread (changed); --- -------------------------------------------------------- - -- -- Table structure for table cache_messages -- @@ -198,8 +190,6 @@ CREATE TABLE cache_messages ( CREATE INDEX ix_cache_messages_changed ON cache_messages (changed); --- -------------------------------------------------------- - -- -- Table structure for table system -- @@ -209,4 +199,4 @@ CREATE TABLE system ( value text NOT NULL ); -INSERT INTO system (name, value) VALUES ('roundcube-version', '2013042700'); +INSERT INTO system (name, value) VALUES ('roundcube-version', '2013052500'); diff --git a/SQL/sqlite/2013052500.sql b/SQL/sqlite/2013052500.sql new file mode 100644 index 000000000..19ae1b110 --- /dev/null +++ b/SQL/sqlite/2013052500.sql @@ -0,0 +1,8 @@ +CREATE TABLE cache_shared ( + cache_key varchar(255) NOT NULL, + created datetime NOT NULL default '0000-00-00 00:00:00', + data text NOT NULL +); + +CREATE INDEX ix_cache_shared_cache_key ON cache_shared(cache_key); +CREATE INDEX ix_cache_shared_created ON cache_shared(created); diff --git a/program/lib/Roundcube/rcube.php b/program/lib/Roundcube/rcube.php index eea2fde84..a57cad57e 100644 --- a/program/lib/Roundcube/rcube.php +++ b/program/lib/Roundcube/rcube.php @@ -257,6 +257,37 @@ class rcube } + /** + * Initialize and get shared cache object + * + * @param string $name Cache identifier + * @param bool $packed Enables/disables data serialization + * + * @return rcube_cache_shared Cache object + */ + public function get_cache_shared($name, $packed=true) + { + $shared_name = "shared_$name"; + + if (!isset($this->caches[$shared_name])) { + $opt = strtolower($name) . '_cache'; + $type = $this->config->get($opt); + $ttl = $this->config->get($opt . '_ttl'); + + if (!$type) { + $type = $this->config->get('shared_cache'); + } + if ($ttl === null) { + $ttl = $this->config->get('shared_cache_ttl'); + } + + $this->caches[$shared_name] = new rcube_cache_shared($type, $name, $ttl, $packed); + } + + return $this->caches[$shared_name]; + } + + /** * Create SMTP object and connect to server * diff --git a/program/lib/Roundcube/rcube_cache_shared.php b/program/lib/Roundcube/rcube_cache_shared.php new file mode 100644 index 000000000..bef9e85f2 --- /dev/null +++ b/program/lib/Roundcube/rcube_cache_shared.php @@ -0,0 +1,544 @@ + | + | Author: Aleksander Machniak | + +-----------------------------------------------------------------------+ +*/ + + +/** + * Interface class for accessing Roundcube shared cache + * + * @package Framework + * @subpackage Cache + * @author Thomas Bruederli + * @author Aleksander Machniak + */ +class rcube_cache +{ + /** + * Instance of database handler + * + * @var rcube_db|Memcache|bool + */ + private $db; + private $type; + private $prefix; + private $ttl; + private $packed; + private $index; + private $table; + private $cache = array(); + private $cache_changes = array(); + private $cache_sums = array(); + + + /** + * Object constructor. + * + * @param string $type Engine type ('db' or 'memcache' or 'apc') + * @param string $prefix Key name prefix + * @param string $ttl Expiration time of memcache/apc items + * @param bool $packed Enables/disabled data serialization. + * It's possible to disable data serialization if you're sure + * stored data will be always a safe string + */ + function __construct($type, $prefix='', $ttl=0, $packed=true) + { + $rcube = rcube::get_instance(); + $type = strtolower($type); + + if ($type == 'memcache') { + $this->type = 'memcache'; + $this->db = $rcube->get_memcache(); + } + else if ($type == 'apc') { + $this->type = 'apc'; + $this->db = function_exists('apc_exists'); // APC 3.1.4 required + } + else { + $this->type = 'db'; + $this->db = $rcube->get_dbh(); + $this->table = $this->db->table_name('cache_shared'); + } + + // convert ttl string to seconds + $ttl = get_offset_sec($ttl); + if ($ttl > 2592000) $ttl = 2592000; + + $this->ttl = $ttl; + $this->packed = $packed; + $this->prefix = $prefix; + } + + + /** + * Returns cached value. + * + * @param string $key Cache key name + * + * @return mixed Cached value + */ + function get($key) + { + if (!array_key_exists($key, $this->cache)) { + return $this->read_record($key); + } + + return $this->cache[$key]; + } + + + /** + * Sets (add/update) value in cache. + * + * @param string $key Cache key name + * @param mixed $data Cache data + */ + function set($key, $data) + { + $this->cache[$key] = $data; + $this->cache_changed = true; + $this->cache_changes[$key] = true; + } + + + /** + * Returns cached value without storing it in internal memory. + * + * @param string $key Cache key name + * + * @return mixed Cached value + */ + function read($key) + { + if (array_key_exists($key, $this->cache)) { + return $this->cache[$key]; + } + + return $this->read_record($key, true); + } + + + /** + * Sets (add/update) value in cache and immediately saves + * it in the backend, no internal memory will be used. + * + * @param string $key Cache key name + * @param mixed $data Cache data + * + * @param boolean True on success, False on failure + */ + function write($key, $data) + { + return $this->write_record($key, $this->packed ? serialize($data) : $data); + } + + + /** + * Clears the cache. + * + * @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, $prefix_mode=false) + { + // Remove all keys + if ($key === null) { + $this->cache = array(); + $this->cache_changed = false; + $this->cache_changes = array(); + $this->cache_sums = array(); + } + // Remove keys by name prefix + else if ($prefix_mode) { + foreach (array_keys($this->cache) as $k) { + if (strpos($k, $key) === 0) { + $this->cache[$k] = null; + $this->cache_changes[$k] = false; + unset($this->cache_sums[$k]); + } + } + } + // Remove one key by name + else { + $this->cache[$key] = null; + $this->cache_changes[$key] = false; + unset($this->cache_sums[$key]); + } + + // Remove record(s) from the backend + $this->remove_record($key, $prefix_mode); + } + + + /** + * Remove cache records older than ttl + */ + function expunge() + { + if ($this->type == 'db' && $this->db) { + $this->db->query( + "DELETE FROM " . $this->table + . " WHERE cache_key LIKE ?" + . " AND " . $this->db->unixtimestamp('created') . " < ?", + $this->prefix . '.%', + time() - $this->ttl); + } + } + + + /** + * Writes the cache back to the DB. + */ + function close() + { + if (!$this->cache_changed) { + 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 = $this->packed ? serialize($data) : $data; + + if (!$this->cache_sums[$key] || $this->cache_sums[$key] != md5($data)) { + $this->write_record($key, $data); + } + } + } + + $this->write_index(); + } + + + /** + * Reads cache entry. + * + * @param string $key Cache key name + * @param boolean $nostore Enable to skip in-memory store + * + * @return mixed Cached value + */ + private function read_record($key, $nostore=false) + { + if (!$this->db) { + return null; + } + + if ($this->type != 'db') { + if ($this->type == 'memcache') { + $data = $this->db->get($this->ckey($key)); + } + else if ($this->type == 'apc') { + $data = apc_fetch($this->ckey($key)); + } + + if ($data) { + $md5sum = md5($data); + $data = $this->packed ? unserialize($data) : $data; + + if ($nostore) { + return $data; + } + + $this->cache_sums[$key] = $md5sum; + $this->cache[$key] = $data; + } + else { + $this->cache[$key] = null; + } + } + else { + $sql_result = $this->db->limitquery( + "SELECT data, cache_key". + " FROM " . $this->table . + " WHERE cache_key = ?". + // for better performance we allow more records for one key + // get the newer one + " ORDER BY created DESC", + 0, 1, $this->prefix . '.' . $key); + + if ($sql_arr = $this->db->fetch_assoc($sql_result)) { + $md5sum = $sql_arr['data'] ? md5($sql_arr['data']) : null; + if ($sql_arr['data']) { + $data = $this->packed ? unserialize($sql_arr['data']) : $sql_arr['data']; + } + + if ($nostore) { + return $data; + } + + $this->cache[$key] = $data; + $this->cache_sums[$key] = $md5sum; + } + else { + $this->cache[$key] = null; + } + } + + return $this->cache[$key]; + } + + + /** + * Writes single cache record into DB. + * + * @param string $key Cache key name + * @param mxied $data Serialized cache data + * + * @param boolean True on success, False on failure + */ + private function write_record($key, $data) + { + if (!$this->db) { + return false; + } + + if ($this->type == 'memcache' || $this->type == 'apc') { + return $this->add_record($this->ckey($key), $data); + } + + $key_exists = array_key_exists($key, $this->cache_sums); + $key = $this->prefix . '.' . $key; + + // Remove NULL rows (here we don't need to check if the record exist) + if ($data == 'N;') { + $this->db->query("DELETE FROM " . $this->table . " WHERE cache_key = ?", $key); + return true; + } + + // update existing cache record + if ($key_exists) { + $result = $this->db->query( + "UPDATE " . $this->table . + " SET created = " . $this->db->now() . ", data = ?" . + " WHERE cache_key = ?", + $data, $key); + } + // add new cache record + else { + // for better performance we allow more records for one key + // so, no need to check if record exist (see rcube_cache::read_record()) + $result = $this->db->query( + "INSERT INTO ".$this->table. + " (created, cache_key, data)". + " VALUES (".$this->db->now().", ?, ?)", + $key, $data); + } + + return $this->db->affected_rows($result); + } + + + /** + * Deletes the cache record(s). + * + * @param string $key Cache key name or pattern + * @param boolean $prefix_mode Enable it to clear all keys starting + * with prefix specified in $key + */ + private function remove_record($key=null, $prefix_mode=false) + { + if (!$this->db) { + return; + } + + if ($this->type != 'db') { + $this->load_index(); + + // Remove all keys + if ($key === null) { + foreach ($this->index as $key) { + $this->delete_record($key, false); + } + $this->index = array(); + } + // Remove keys by name prefix + else if ($prefix_mode) { + foreach ($this->index as $k) { + if (strpos($k, $key) === 0) { + $this->delete_record($k); + } + } + } + // Remove one key by name + else { + $this->delete_record($key); + } + + return; + } + + // Remove all keys (in specified cache) + if ($key === null) { + $where = " WHERE cache_key LIKE " . $this->db->quote($this->prefix.'.%'); + } + // Remove keys by name prefix + else if ($prefix_mode) { + $where = " WHERE cache_key LIKE " . $this->db->quote($this->prefix.'.'.$key.'%'); + } + // Remove one key by name + else { + $where = " WHERE cache_key = " . $this->db->quote($this->prefix.'.'.$key); + } + + $this->db->query("DELETE FROM " . $this->table . $where); + } + + + /** + * Adds entry into memcache/apc DB. + * + * @param string $key Cache key name + * @param mxied $data Serialized cache data + * @param bollean $index Enables immediate index update + * + * @param boolean True on success, False on failure + */ + private function add_record($key, $data, $index=false) + { + if ($this->type == 'memcache') { + $result = $this->db->replace($key, $data, MEMCACHE_COMPRESSED, $this->ttl); + if (!$result) { + $result = $this->db->set($key, $data, MEMCACHE_COMPRESSED, $this->ttl); + } + } + else if ($this->type == 'apc') { + if (apc_exists($key)) { + apc_delete($key); + } + $result = apc_store($key, $data, $this->ttl); + } + + // Update index + if ($index && $result) { + $this->load_index(); + + if (array_search($key, $this->index) === false) { + $this->index[] = $key; + $data = serialize($this->index); + $this->add_record($this->ikey(), $data); + } + } + + return $result; + } + + + /** + * Deletes entry from memcache/apc DB. + */ + private function delete_record($key, $index=true) + { + if ($this->type == 'memcache') { + // #1488592: use 2nd argument + $this->db->delete($this->ckey($key), 0); + } + else { + apc_delete($this->ckey($key)); + } + + if ($index) { + if (($idx = array_search($key, $this->index)) !== false) { + unset($this->index[$idx]); + } + } + } + + + /** + * Writes the index entry into memcache/apc DB. + */ + private function write_index() + { + if (!$this->db) { + return; + } + + if ($this->type == 'db') { + return; + } + + $this->load_index(); + + // Make sure index contains new keys + foreach ($this->cache as $key => $value) { + if ($value !== null) { + if (array_search($key, $this->index) === false) { + $this->index[] = $key; + } + } + } + + $data = serialize($this->index); + $this->add_record($this->ikey(), $data); + } + + + /** + * Gets the index entry from memcache/apc DB. + */ + private function load_index() + { + if (!$this->db) { + return; + } + + if ($this->index !== null) { + return; + } + + $index_key = $this->ikey(); + + if ($this->type == 'memcache') { + $data = $this->db->get($index_key); + } + else if ($this->type == 'apc') { + $data = apc_fetch($index_key); + } + + $this->index = $data ? unserialize($data) : array(); + } + + + /** + * Creates cache key name (for memcache and apc) + * + * @param string $key Cache key name + * + * @return string Cache key + */ + private function ckey($key) + { + return $this->prefix . ':' . $key; + } + + + /** + * Creates index cache key name (for memcache and apc) + * + * @return string Cache key + */ + private function ikey() + { + // This way each cache will have its own index + return $this->prefix . 'INDEX'; + } +} -- cgit v1.2.3