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/*
 * Copyright (c) 2017 Cisco Systems, Inc.  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.lispflowmapping.neutron.intenthandler.util;

/**
 * Created by Shakib Ahmed on 1/23/17.
 */

import static org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus.ConnectionStatus.Connected;
import static org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus.ConnectionStatus.Connecting;

import com.google.common.util.concurrent.SettableFuture;
import java.util.Collection;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.opendaylight.mdsal.binding.api.ClusteredDataTreeChangeListener;
import org.opendaylight.mdsal.binding.api.DataBroker;
import org.opendaylight.mdsal.binding.api.DataObjectModification;
import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
import org.opendaylight.mdsal.binding.api.DataTreeModification;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNode;
import org.opendaylight.yang.gen.v1.urn.opendaylight.netconf.node.topology.rev150114.NetconfNodeConnectionStatus;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
import org.opendaylight.yangtools.concepts.ListenerRegistration;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Purpose: verify whether provided netconf node is already connected or wait if not.
 *
 * 

* VppNetconfConnectionProbe registers istener which catches node-related changes from topology-netconf. * A {@link SettableFuture} is set {@link Boolean#TRUE}, if the node is connected within {@link * VppNetconfConnectionProbe#NODE_CONNECTION_TIMER} seconds. Else, proper exception is throws. *

* */ public class VppNetconfConnectionProbe implements ClusteredDataTreeChangeListener { private static final Logger LOG = LoggerFactory.getLogger(VppNodeReader.class); public static final int NODE_CONNECTION_TIMER = 60; private final DataBroker dataBroker; private ListenerRegistration registeredListener; private final SettableFuture connectionStatusFuture = SettableFuture.create(); private static final String TOPOLOGY_IDENTIFIER = "topology-netconf"; private final DataTreeIdentifier path; public VppNetconfConnectionProbe(final NodeId nodeId, final DataBroker dataBroker) { this.dataBroker = dataBroker; final InstanceIdentifier nodeIid = InstanceIdentifier.builder(NetworkTopology.class) .child(Topology.class, new TopologyKey(new TopologyId(TOPOLOGY_IDENTIFIER))) .child(Node.class, new NodeKey(nodeId)) .build(); path = DataTreeIdentifier.create(LogicalDatastoreType.OPERATIONAL, nodeIid); } public boolean startProbing() throws ExecutionException, InterruptedException, TimeoutException { registeredListener = dataBroker.registerDataTreeChangeListener(path, this); return connectionStatusFuture.get(NODE_CONNECTION_TIMER, TimeUnit.SECONDS); } @Override public void onDataTreeChanged(Collection> changes) { changes.forEach(modification -> { final DataObjectModification rootNode = modification.getRootNode(); final Node node = rootNode.getDataAfter(); final NetconfNode netconfNode = getNodeAugmentation(node); if (node == null || node.getNodeId() == null) { return; } if (netconfNode == null || netconfNode.getConnectionStatus() == null) { connectionStatusFuture.set(false); unregister(); } else { final NetconfNodeConnectionStatus.ConnectionStatus status = netconfNode.getConnectionStatus(); if (status.equals(Connected)) { connectionStatusFuture.set(true); unregister(); } else if (!status.equals(Connecting)) { connectionStatusFuture.set(false); unregister(); } } }); } private NetconfNode getNodeAugmentation(Node node) { NetconfNode netconfNode = node.augmentation(NetconfNode.class); if (netconfNode == null) { return null; } return netconfNode; } private void unregister() { if (registeredListener != null) { registeredListener.close(); } } }




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