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diff --git a/applications/statistics-manager/src/main/java/org/opendaylight/openflowplugin/applications/statistics/manager/StatPermCollector.java b/applications/statistics-manager/src/main/java/org/opendaylight/openflowplugin/applications/statistics/manager/StatPermCollector.java
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+++ b/applications/statistics-manager/src/main/java/org/opendaylight/openflowplugin/applications/statistics/manager/StatPermCollector.java
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+/**
+ * Copyright (c) 2014 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.openflowplugin.applications.statistics.manager;
+
+import java.util.List;
+
+import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.transaction.rev131103.TransactionId;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * statistics-manager
+ * org.opendaylight.openflowplugin.applications.statistics.manager
+ *
+ * StatPermCollector
+ * Class implement {@link Runnable} and inside is running statistic collecting
+ * process DataObject statistics by DataObject statistics for every {@link org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNode}.
+ * Every statistics wait to finish previous statistics. Only if all statistics finish,
+ * next {@link org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNode}
+ * Statistics should be collecting. We are able to set minimal time for start next round cross all Network,
+ * but all depends on network possibility.
+ *
+ * @author <a href="mailto:vdemcak@cisco.com">Vaclav Demcak</a>
+ *
+ * Created: Aug 28, 2014
+ */
+public interface StatPermCollector extends Runnable, AutoCloseable {
+
+    /**
+     * StatCapType
+     * Enum class refers ofp_statistics capabilities fields from OF Switch
+     * capabilities specification which have to come as a post HandShake
+     * information from OF Switch and Inventory Manager adds all to the
+     * Operational/DS.
+     * If the capabilities are not add (for any reason) NodeRegistrator
+     * adds all StatCapTypes for the {@link Node}.
+     */
+    public enum StatCapabTypes {
+        /**
+         * OFPC_FLOW_STATS
+         */
+        FLOW_STATS,
+        /**
+         * OFPC_TABLE_STATS
+         */
+        TABLE_STATS,
+        /**
+         * OFPC_PORT_STATS
+         */
+        PORT_STATS,
+        /**
+         * OFPC_GROUP_STATS
+         */
+        GROUP_STATS,
+        /**
+         * OFPC_QUEUE_STATS
+         */
+        QUEUE_STATS,
+        /**
+         * Meter statistics has no support from OF Switch capabilities
+         * so we have to try get statistics for it and wait for response
+         * Error or response package with results.
+         */
+        METER_STATS
+    }
+
+    /**
+     * Add new connected node for permanent statistics collecting process
+     *
+     * @param flowNode
+     * @param statTypes
+     * @param nrOfSwitchTables
+     * @return true/false if the {@link Node} added successful
+     */
+    boolean connectedNodeRegistration(InstanceIdentifier<Node> nodeIdent,
+            List<StatCapabTypes> statTypes, Short nrOfSwitchTables);
+
+    /**
+     * All disconnected Nodes need be removed from stat list Nodes
+     *
+     * @param flowNode
+     * @return true/false if the {@link Node} removed successful
+     */
+    boolean disconnectedNodeUnregistration(InstanceIdentifier<Node> nodeIdent);
+
+    /**
+     * Method add new feature {@link StatCapabTypes} to Node identified by
+     * nodeIdent -> InstanceIdentifier<Node>
+     *
+     * @param flowNode
+     * @return true/false if the {@link StatCapabTypes} add successful
+     */
+    boolean registerAdditionalNodeFeature(InstanceIdentifier<Node> nodeIdent, StatCapabTypes statCapab);
+
+    /**
+     * Method return true only and only if {@link StatPermCollector} contain
+     * valid node registration in its internal {@link Node} map.
+     * Otherwise return false.
+     *
+     * @param flowNode
+     * @return
+     */
+    boolean isProvidedFlowNodeActive(InstanceIdentifier<Node> nodeIdent);
+
+    /**
+     * Object notification for continue statistics collecting process.
+     * It is call from collecting allStatistics methods as a future result for
+     * Operational/DS statistic store call (does not matter in the outcome).
+     */
+    void collectNextStatistics(TransactionId xid);
+
+    /**
+     * Method returns true if collector has registered some active nodes
+     * otherwise return false.
+     *
+     * @return
+     */
+    boolean hasActiveNodes();
+}
+