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<?php
/*
* Laconica - a distributed open-source microblogging tool
* Copyright (C) 2008, Controlez-Vous, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
if (!defined('LACONICA')) { exit(1); }
require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
class Memcached_DataObject extends DB_DataObject
{
function &staticGet($cls, $k, $v=NULL) {
if (is_null($v)) {
$v = $k;
# XXX: HACK!
$i = new $cls;
$keys = $i->keys();
$k = $keys[0];
unset($i);
}
$i = Memcached_DataObject::getcached($cls, $k, $v);
if ($i) {
return $i;
} else {
$i = DB_DataObject::staticGet($cls, $k, $v);
if ($i) {
$i->encache();
}
return $i;
}
}
function &pkeyGet($cls, $kv) {
$i = Memcached_DataObject::multicache($cls, $kv);
if ($i) {
return $i;
} else {
$i = new $cls();
foreach ($kv as $k => $v) {
$i->$k = $v;
}
if ($i->find(true)) {
$i->encache();
return $i;
} else {
return NULL;
}
}
}
function insert() {
$result = parent::insert();
return $result;
}
function update($orig=NULL) {
if (is_object($orig) && $orig instanceof Memcached_DataObject) {
$orig->decache(); # might be different keys
}
$result = parent::update($orig);
if ($result) {
$this->encache();
}
return $result;
}
function delete() {
$this->decache(); # while we still have the values!
return parent::delete();
}
static function memcache() {
return common_memcache();
}
static function cacheKey($cls, $k, $v) {
return common_cache_key(strtolower($cls).':'.$k.':'.$v);
}
static function getcached($cls, $k, $v) {
$c = Memcached_DataObject::memcache();
if (!$c) {
return false;
} else {
return $c->get(Memcached_DataObject::cacheKey($cls, $k, $v));
}
}
function keyTypes() {
global $_DB_DATAOBJECT;
if (!isset($_DB_DATAOBJECT['INI'][$this->_database][$this->__table."__keys"])) {
$this->databaseStructure();
}
return $_DB_DATAOBJECT['INI'][$this->_database][$this->__table."__keys"];
}
function encache() {
$c = $this->memcache();
if (!$c) {
return false;
} else {
$pkey = array();
$pval = array();
$types = $this->keyTypes();
ksort($types);
foreach ($types as $key => $type) {
if ($type == 'K') {
$pkey[] = $key;
$pval[] = $this->$key;
} else {
$c->set($this->cacheKey($this->tableName(), $key, $this->$key), $this);
}
}
# XXX: should work for both compound and scalar pkeys
$pvals = implode(',', $pval);
$pkeys = implode(',', $pkey);
$c->set($this->cacheKey($this->tableName(), $pkeys, $pvals), $this);
}
}
function decache() {
$c = $this->memcache();
if (!$c) {
return false;
} else {
$pkey = array();
$pval = array();
$types = $this->keyTypes();
ksort($types);
foreach ($types as $key => $type) {
if ($type == 'K') {
$pkey[] = $key;
$pval[] = $this->$key;
} else {
$c->delete($this->cacheKey($this->tableName(), $key, $this->$key));
}
}
# should work for both compound and scalar pkeys
# XXX: comma works for now but may not be safe separator for future keys
$pvals = implode(',', $pval);
$pkeys = implode(',', $pkey);
$c->delete($this->cacheKey($this->tableName(), $pkeys, $pvals));
}
}
function multicache($cls, $kv) {
ksort($kv);
$c = Memcached_DataObject::memcache();
if (!$c) {
return false;
} else {
$pkeys = implode(',', array_keys($kv));
$pvals = implode(',', array_values($kv));
return $c->get(Memcached_DataObject::cacheKey($cls, $pkeys, $pvals));
}
}
}
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