--- /dev/null
+/**
+ * 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();
+}
+