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phorge/src/applications/system/engine/PhabricatorCacheEngine.php
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PhabricatorCacheEngine.php
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<?php
final class PhabricatorCacheEngine extends Phobject {
public function getViewer() {
return PhabricatorUser::getOmnipotentUser();
}
public function updateObject($object) {
$objects = array(
$object->getPHID() => $object,
);
$new_objects = $objects;
while (true) {
$discovered_objects = array();
$load = array();
$extensions = PhabricatorCacheEngineExtension::getAllExtensions();
foreach ($extensions as $key => $extension) {
$discoveries = $extension->discoverLinkedObjects($this, $new_objects);
if (!is_array($discoveries)) {
throw new Exception(
pht(
'Cache engine extension "%s" did not return a list of linked '.
'objects.',
get_class($extension)));
}
foreach ($discoveries as $discovery) {
if ($discovery === null) {
// This is allowed because it makes writing extensions a lot
// easier if they don't have to check that related PHIDs are
// actually set to something.
continue;
}
$is_phid = is_string($discovery);
if ($is_phid) {
$phid = $discovery;
} else {
$phid = $discovery->getPHID();
if (!$phid) {
throw new Exception(
pht(
'Cache engine extension "%s" returned object (of class '.
'"%s") with no PHID.',
get_class($extension),
get_class($discovery)));
}
}
if (isset($objects[$phid])) {
continue;
}
if ($is_phid) {
$load[$phid] = $phid;
} else {
$objects[$phid] = $discovery;
$discovered_objects[$phid] = $discovery;
// If another extension only knew about the PHID of this object,
// we don't need to load it any more.
unset($load[$phid]);
}
}
}
if ($load) {
$load_objects = id(new PhabricatorObjectQuery())
->setViewer($this->getViewer())
->withPHIDs($load)
->execute();
foreach ($load_objects as $phid => $loaded_object) {
$objects[$phid] = $loaded_object;
$discovered_objects[$phid] = $loaded_object;
}
}
// If we didn't find anything new to update, we're all set.
if (!$discovered_objects) {
break;
}
$new_objects = $discovered_objects;
}
foreach ($extensions as $extension) {
$extension->deleteCaches($this, $objects);
}
}
}

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