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diff --git a/opendaylight/adsal/sal/api/src/main/java/org/opendaylight/controller/sal/inventory/IPluginInInventoryService.java b/opendaylight/adsal/sal/api/src/main/java/org/opendaylight/controller/sal/inventory/IPluginInInventoryService.java
new file mode 100644
index 0000000000..4007dc86e7
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+++ b/opendaylight/adsal/sal/api/src/main/java/org/opendaylight/controller/sal/inventory/IPluginInInventoryService.java
@@ -0,0 +1,48 @@
+
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  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
+ */
+
+package org.opendaylight.controller.sal.inventory;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentMap;
+
+import org.opendaylight.controller.sal.core.Node;
+import org.opendaylight.controller.sal.core.NodeConnector;
+import org.opendaylight.controller.sal.core.Property;
+
+/**
+ * The Interface describes methods invoked from SAL toward the protocol plugin
+ * to solicit existing inventory data.
+ */
+public interface IPluginInInventoryService {
+    /**
+     * The method retrieves all the existing nodes and properties attached
+     *
+     * @return map of {@link org.opendaylight.controller.sal.core.Node} and {@link org.opendaylight.controller.sal.core.Property}
+     */
+    public ConcurrentMap<Node, Map<String, Property>> getNodeProps();
+
+    /**
+     * The method retrieve all the existing nodeConnectors and their properties
+     *
+     * @param refresh true if it needs to solicit Openflow core; otherwise, retrieve from local cache.
+     * @return map of {@link org.opendaylight.controller.sal.core.NodeConnector} and {@link org.opendaylight.controller.sal.core.Property}
+     */
+    public ConcurrentMap<NodeConnector, Map<String, Property>> getNodeConnectorProps(
+            Boolean refresh);
+
+    /**
+     * The method retrieves all the configured nodes that are not connected to
+     * the controller
+     *
+     * @return Set of {@link org.opendaylight.controller.sal.core.Node}
+     */
+    public Set<Node> getConfiguredNotConnectedNodes();
+}