diff options
Diffstat (limited to 'classes/Memcached_DataObject.php')
| -rw-r--r-- | classes/Memcached_DataObject.php | 144 |
1 files changed, 98 insertions, 46 deletions
diff --git a/classes/Memcached_DataObject.php b/classes/Memcached_DataObject.php index 33645a3e8..f59213c2c 100644 --- a/classes/Memcached_DataObject.php +++ b/classes/Memcached_DataObject.php @@ -66,7 +66,6 @@ class Memcached_DataObject extends DB_DataObject // Clear this out so we don't accidentally break global // state in *this* process. $this->_DB_resultid = null; - // We don't have any local DBO refs, so clear these out. $this->_link_loaded = false; } @@ -91,9 +90,7 @@ class Memcached_DataObject extends DB_DataObject unset($i); } $i = Memcached_DataObject::getcached($cls, $k, $v); - if ($i) { - return $i; - } else { + if ($i === false) { // false == cache miss $i = DB_DataObject::factory($cls); if (empty($i)) { $i = false; @@ -101,22 +98,34 @@ class Memcached_DataObject extends DB_DataObject } $result = $i->get($k, $v); if ($result) { + // Hit! $i->encache(); - return $i; } else { + // save the fact that no such row exists + $c = self::memcache(); + if (!empty($c)) { + $ck = self::cachekey($cls, $k, $v); + $c->set($ck, null); + } $i = false; - return $i; } } + return $i; } - function &pkeyGet($cls, $kv) + /** + * @fixme Should this return false on lookup fail to match staticGet? + */ + function pkeyGet($cls, $kv) { $i = Memcached_DataObject::multicache($cls, $kv); - if ($i) { + if ($i !== false) { // false == cache miss return $i; } else { - $i = new $cls(); + $i = DB_DataObject::factory($cls); + if (empty($i)) { + return false; + } foreach ($kv as $k => $v) { $i->$k = $v; } @@ -124,6 +133,11 @@ class Memcached_DataObject extends DB_DataObject $i->encache(); } else { $i = null; + $c = self::memcache(); + if (!empty($c)) { + $ck = self::multicacheKey($cls, $kv); + $c->set($ck, null); + } } return $i; } @@ -132,6 +146,9 @@ class Memcached_DataObject extends DB_DataObject function insert() { $result = parent::insert(); + if ($result) { + $this->encache(); // in case of cached negative lookups + } return $result; } @@ -186,6 +203,17 @@ class Memcached_DataObject extends DB_DataObject function keyTypes() { + // ini-based classes return number-indexed arrays. handbuilt + // classes return column => keytype. Make this uniform. + + $keys = $this->keys(); + + $keyskeys = array_keys($keys); + + if (is_string($keyskeys[0])) { + return $keys; + } + global $_DB_DATAOBJECT; if (!isset($_DB_DATAOBJECT['INI'][$this->_database][$this->__table."__keys"])) { $this->databaseStructure(); @@ -197,6 +225,7 @@ class Memcached_DataObject extends DB_DataObject function encache() { $c = $this->memcache(); + if (!$c) { return false; } else if ($this->tableName() == 'user' && is_object($this->id)) { @@ -206,64 +235,86 @@ class Memcached_DataObject extends DB_DataObject str_replace("\n", " ", $e->getTraceAsString())); 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); + $keys = $this->_allCacheKeys(); + + foreach ($keys as $key) { + $c->set($key, $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)); + } + + $keys = $this->_allCacheKeys(); + + foreach ($keys as $key) { + $c->delete($key, $this); + } + } + + function _allCacheKeys() + { + $ckeys = array(); + + $types = $this->keyTypes(); + ksort($types); + + $pkey = array(); + $pval = array(); + + foreach ($types as $key => $type) { + + assert(!empty($key)); + + if ($type == 'U') { + if (empty($this->$key)) { + continue; } + $ckeys[] = $this->cacheKey($this->tableName(), $key, $this->$key); + } else if ($type == 'K' || $type == 'N') { + $pkey[] = $key; + $pval[] = $this->$key; + } else { + throw new Exception("Unknown key type $key => $type for " . $this->tableName()); } - # 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, $pvals)); } + + assert(count($pkey) > 0); + + // XXX: should work for both compound and scalar pkeys + $pvals = implode(',', $pval); + $pkeys = implode(',', $pkey); + + $ckeys[] = $this->cacheKey($this->tableName(), $pkeys, $pvals); + + return $ckeys; } function multicache($cls, $kv) { ksort($kv); - $c = Memcached_DataObject::memcache(); + $c = self::memcache(); if (!$c) { return false; } else { - $pkeys = implode(',', array_keys($kv)); - $pvals = implode(',', array_values($kv)); - return $c->get(Memcached_DataObject::cacheKey($cls, $pkeys, $pvals)); + return $c->get(self::multicacheKey($cls, $kv)); } } + static function multicacheKey($cls, $kv) + { + ksort($kv); + $pkeys = implode(',', array_keys($kv)); + $pvals = implode(',', array_values($kv)); + return self::cacheKey($cls, $pkeys, $pvals); + } + function getSearchEngine($table) { require_once INSTALLDIR.'/lib/search_engines.php'; @@ -298,7 +349,8 @@ class Memcached_DataObject extends DB_DataObject $key_part = common_keyize($cls).':'.md5($qry); $ckey = common_cache_key($key_part); $stored = $c->get($ckey); - if ($stored) { + + if ($stored !== false) { return new ArrayWrapper($stored); } |