IcingaObject: Do not invalidate templateResolver on every setImports()

Do not clear templateResolver, but refresh current object with its "new" parents.

refs #11803

library/Director/Objects/IcingaObject.php

@@ -1005,10 +1005,6 @@ abstract class IcingaObject extends DbObject implements IcingaConfigRenderer
     public function invalidateResolveCache()
     {
         $this->resolveCache = array();
-        if ($this->templateResolver) {
-            $this->templateResolver()->clearCache();
-        }
-
         return $this;
     }
 

library/Director/Objects/IcingaObjectImports.php

@@ -167,6 +167,7 @@ class IcingaObjectImports implements Iterator, Countable, IcingaConfigRenderer
     protected function refreshIndex()
     {
         $this->idx = array_keys($this->imports);
+        $this->object->templateResolver()->refreshObject($this->object);
         return $this;
     }
 

library/Director/Objects/IcingaTemplateResolver.php

@@ -9,10 +9,13 @@ use Icinga\Module\Director\Exception\NestingError;
 // TODO: move the 'type' layer to another class
 class IcingaTemplateResolver
 {
+    /** @var IcingaObject */
     protected $object;
 
+    /** @var Db */
     protected $connection;
 
+    /** @var  \Zend_Db_Adapter_Abstract */
     protected $db;
 
     protected $type;
@@ -162,6 +165,11 @@ class IcingaTemplateResolver
         return $this->resolveParentIds();
     }
 
+    /**
+     * TODO: unfinished and not used currently
+     *
+     * @return array
+     */
     public function listResolvedParentNames()
     {
         $this->requireTemplates();
@@ -365,4 +373,14 @@ class IcingaTemplateResolver
         unset($this->db);
         unset($this->object);
     }
+
+    public function refreshObject(IcingaObject $object)
+    {
+        $parentNames = $object->imports;
+        self::$nameIdx[$object->object_name] = $parentNames;
+        if ($object->hasBeenLoadedFromDb()) {
+            self::$idIdx[$object->getId()] = $this->getIdsForNames($parentNames);
+        }
+        return $this;
+    }
 }