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Change-Id: I0425764b2f3b07bc224a387ab7d544c6b360c691
diff --git a/core/api/src/main/java/org/onosproject/ui/UiTopoLayoutService.java b/core/api/src/main/java/org/onosproject/ui/UiTopoLayoutService.java
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+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.ui;
+
+import org.onosproject.ui.model.topo.UiTopoLayout;
+
+import java.util.List;
+
+/**
+ * Service for managing {@link UiTopoLayout} instances.
+ */
+public interface UiTopoLayoutService {
+
+ /**
+ * Returns the list of available layouts.
+ *
+ * @return available layouts
+ */
+ List<UiTopoLayout> getLayouts();
+
+ /**
+ * Adds a layout to the system.
+ *
+ * @param layout the layout to add
+ * @return an indication of success
+ */
+ boolean addLayout(UiTopoLayout layout);
+
+ /**
+ * Removes a layout from the system.
+ *
+ * @param layout the layout to remove
+ * @return an indication of success
+ */
+ boolean removeLayout(UiTopoLayout layout);
+
+}