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diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/graph/ResourceSynchronizer.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/graph/ResourceSynchronizer.java
new file mode 100644
index 000000000..17b61381c
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+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/graph/ResourceSynchronizer.java
@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.diagram.synchronization.graph;
+
+import org.simantics.db.Resource;
+import org.simantics.diagram.synchronization.IHintSynchronizer;
+import org.simantics.diagram.synchronization.IModificationQueue;
+import org.simantics.diagram.synchronization.ISynchronizationContext;
+import org.simantics.diagram.synchronization.SynchronizationHints;
+import org.simantics.g2d.element.ElementHints;
+import org.simantics.utils.datastructures.hints.IHintObservable;
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+
+/**
+ * One should implement
+ * {@link #hintChanged(ISynchronizationContext, IModificationQueue, Resource, IHintObservable, Key, Object, Object)}
+ * and
+ * {@link #getSynchronizedHints()}.
+ * 
+ * @author Tuukka Lehtonen
+ */
+public abstract class ResourceSynchronizer implements IHintSynchronizer {
+
+    @Override
+    public final int synchronize(ISynchronizationContext context, IHintObservable observable) {
+        Object o = observable.getHint(ElementHints.KEY_OBJECT);
+        if (o instanceof Resource) {
+            IModificationQueue queue = context.get(SynchronizationHints.MODIFICATION_QUEUE);
+            return synchronize(context, queue, (Resource) o, observable);
+        }
+        return 0;
+    }
+
+    public abstract Key[] getSynchronizedHints();
+
+    public int synchronize(ISynchronizationContext context, IModificationQueue queue, Resource object, IHintObservable observable) {
+        int count = 0;
+        for (Key key : getSynchronizedHints()) {
+            count += synchronizeHint(context, queue, object, observable, key);
+        }
+        return count;
+    }
+
+    protected final int synchronizeHint(ISynchronizationContext context, IModificationQueue queue, Resource object, IHintObservable observable, Key key) {
+        return hintChanged(context, queue, object, observable, key, null, observable.getHint(key)) ? 1 : 0;
+    }
+
+    @Override
+    public final boolean hintChanged(ISynchronizationContext context, IHintObservable sender, Key key, Object oldValue, Object newValue) {
+        Object o = sender.getHint(ElementHints.KEY_OBJECT);
+        if (o instanceof Resource) {
+            IModificationQueue queue = context.get(SynchronizationHints.MODIFICATION_QUEUE);
+            return hintChanged(context, queue, (Resource) o, sender, key, oldValue, newValue);
+        }
+        return false;
+    }
+
+    @Override
+    public final boolean hintRemoved(ISynchronizationContext context, IHintObservable sender, Key key, Object oldValue) {
+        Object o = sender.getHint(ElementHints.KEY_OBJECT);
+        if (o instanceof Resource) {
+            IModificationQueue queue = context.get(SynchronizationHints.MODIFICATION_QUEUE);
+            return hintRemoved(context, queue, (Resource) o, sender, key, oldValue);
+        }
+        return false;
+    }
+
+    public abstract boolean hintChanged(ISynchronizationContext context, IModificationQueue queue, Resource object, IHintObservable sender, Key key, Object oldValue, Object newValue);
+
+    public boolean hintRemoved(ISynchronizationContext context, IModificationQueue queue, Resource object, IHintObservable sender, Key key, Object oldValue) {
+        return false;
+    }
+
+}