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diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/ObservableInputSource.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/ObservableInputSource.java
new file mode 100644
index 000000000..a5406a9af
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+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/ObservableInputSource.java
@@ -0,0 +1,30 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2011 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.browsing.ui.graph.impl;
+
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public interface ObservableInputSource extends SessionContextInputSource {
+
+    /**
+     * This method may be invoked at any time. If the source is disposed it
+     * shouldn't do anything.
+     * 
+     * @param listener the listener that shall be invoked when the input source
+     *        content has changed. Previous listener will be overridden.
+     *        <code>null</code> to remove current listener.
+     */
+    void setListener(InputSourceListener listener);
+
+}