diff --git a/library/Director/Import/Sync.php b/library/Director/Import/Sync.php
new file mode 100644
index 00000000..7d0ce810
--- /dev/null
+++ b/library/Director/Import/Sync.php
@@ -0,0 +1,136 @@
+<?php
+
+namespace Icinga\Module\Director\Import;
+
+use Icinga\Module\Director\Objects\IcingaHost;
+use Icinga\Module\Director\Objects\ImportSource;
+use Icinga\Module\Director\Objects\SyncRule;
+
+class Sync
+{
+    protected function __construct()
+    {
+    }
+
+    public static function run(SyncRule $rule)
+    {
+        $sync = new static;
+        return $sync->runWithRule($rule);
+    }
+
+    protected function extractVariableNames($string)
+    {
+        if (preg_match_all('/\${([A-Za-z0-9_-]+)}/', $string, $m, PREG_PATTERN_ORDER)) {
+            return $m[1];
+        } else {
+            return array();
+        }
+    }
+
+    protected function fillVariables($string, $row)
+    {
+        $func = function ($match) use ($row) {
+            return $row->{$match[1]};
+        };
+
+        return preg_replace_callback('/\${([A-Za-z0-9_-]+)}/', $func, $string);
+    }
+
+    protected function runWithRule(SyncRule $rule)
+    {
+        $db = $rule->getConnection();
+        $properties = $rule->fetchSyncProperties();
+        $sourceColumns = array();
+        $sources = array();
+        // $fieldMap = array();
+
+        foreach ($properties as $p) {
+            $sourceId = $p->source_id;
+            if (! array_key_exists($sourceId, $sources)) {
+                $sources[$sourceId] = ImportSource::load($sourceId, $db);
+                $sourceColumns[$sourceId] = array();
+            }
+
+            foreach ($this->extractVariableNames($p->source_expression) as $varname) {
+                $sourceColumns[$sourceId][$varname] = $varname;
+                // -> ? $fieldMap[
+            }
+        }
+
+        $imported = array();
+        foreach ($sources as $source) {
+            $sourceId = $source->id;
+            $rows = $db->fetchLatestImportedRows($sourceId, $sourceColumns[$sourceId]);
+            $key = $source->key_column;
+            $imported[$sourceId] = array();
+            foreach ($rows as $row) {
+                $imported[$sourceId][$row->$key] = $row;
+            }
+        }
+
+        // TODO: Filter auf object, nicht template
+        $objects = IcingaHost::loadAll($db, null, 'object_name');
+
+        // TODO: "hardcoded" single sourceId, fix this!
+        foreach ($imported[$sourceId] as $key => $row) {
+            $newProps = array(
+                'object_type' => 'object',
+                'object_name' => $key
+            );
+
+            $newVars = array();
+
+            foreach ($properties as $p) {
+                $prop = $p->destination_field;
+                $val = $this->fillVariables($p->source_expression, $row);
+
+                if (substr($prop, 0, 5) === 'vars.') {
+                    $newVars[substr($prop, 5)] = $val;
+                } else {
+                    $newProps[$prop] = $val;
+                }
+            }
+
+            if (array_key_exists($key, $objects)) {
+                switch ($rule->update_policy) {
+                    case 'override':
+                        $objects[$key] = IcingaHost::create($newProps);
+                        foreach ($newVars as $prop => $var) {
+                            $objects[$key]->vars()->$prop = $var;
+                        }
+                        break;
+                    case 'merge':
+                        $object = $objects[$key];
+                        foreach ($newProps as $prop => $value) {
+                            // TODO: data type? 
+                            $object->set($prop, $value);
+                        }
+                        foreach ($newVars as $prop => $var) {
+                            // TODO: property merge policy
+                            $object->vars()->$prop = $var;
+                        }
+                        break;
+                    default:
+                        // policy 'ignore', no action
+                }
+            } else {
+                $objects[$key] = IcingaHost::create($newProps);
+                foreach ($newVars as $prop => $var) {
+                    $objects[$key]->vars()->$prop = $var;
+                }
+            }
+
+            foreach ($objects as $object) {
+                if ($object->hasBeenLoadedFromDb() && $rule->purge_existing === 'y') {
+                    /*
+                    // TODO: Check against ALL sources
+                    if (! array_key_exists($object->object_name, $imported[$sourceId])) {
+                        $object->delete();
+                    }
+                    */
+                }
+                $object->store($db);
+            }
+        }
+    }
+}