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authorBrion Vibber <brion@status.net>2010-01-04 14:38:56 -0800
committerBrion Vibber <brion@status.net>2010-01-04 14:38:56 -0800
commit78214c4e067616828478d600d500b34b6fcb9061 (patch)
tree9b8d9724e91c22a45178f5dc776b64edfa197fa3 /classes/Memcached_DataObject.php
parent8f02379f6e05e4bf1bff69d6d0fcf3d90a4d1181 (diff)
Exclude process-specific link & result cache references from serialized Memcached_Data_Object instances.
Should fix seemingly-random bugs due to destructor free()ing local resources by mistake. cherry-pick from 0.9.x
Diffstat (limited to 'classes/Memcached_DataObject.php')
-rw-r--r--classes/Memcached_DataObject.php45
1 files changed, 45 insertions, 0 deletions
diff --git a/classes/Memcached_DataObject.php b/classes/Memcached_DataObject.php
index d89a9421e..ca360d411 100644
--- a/classes/Memcached_DataObject.php
+++ b/classes/Memcached_DataObject.php
@@ -37,6 +37,51 @@ class Memcached_DataObject extends DB_DataObject
}
}
+ /**
+ * Magic function called at serialize() time.
+ *
+ * We use this to drop a couple process-specific references
+ * from DB_DataObject which can cause trouble in future
+ * processes.
+ *
+ * @return array of variable names to include in serialization.
+ */
+ function __sleep()
+ {
+ $vars = array_keys(get_object_vars($this));
+ $skip = array('_DB_resultid', '_link_loaded');
+ return array_diff($vars, $skip);
+ }
+
+ /**
+ * Magic function called at unserialize() time.
+ *
+ * Clean out some process-specific variables which might
+ * be floating around from a previous process's cached
+ * objects.
+ *
+ * Old cached objects may still have them.
+ */
+ function __wakeup()
+ {
+ // Refers to global state info from a previous process.
+ // 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;
+ }
+
+ /**
+ * Wrapper for DB_DataObject's static lookup using memcached
+ * as backing instead of an in-process cache array.
+ *
+ * @param string $cls classname of object type to load
+ * @param mixed $k key field name, or value for primary key
+ * @param mixed $v key field value, or leave out for primary key lookup
+ * @return mixed Memcached_DataObject subtype or false
+ */
function &staticGet($cls, $k, $v=null)
{
if (is_null($v)) {