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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/cache/IFactory.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/cache/IFactory.java
new file mode 100644
index 000000000..09f3c6948
--- /dev/null
+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/cache/IFactory.java
@@ -0,0 +1,25 @@
+/*******************************************************************************
+ * 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.utils.datastructures.cache;
+
+/**
+ * Factory always constructs a new instance in get().
+ * The difference to IProvider is that IFactory will never return the 
+ * same result value twice, and the result value is always a new instance. 
+ *
+ * @param <T>
+ * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
+ */
+public interface IFactory<T> extends IProvider<T> {
+
+}
+