southbound/southbound-impl/src/main/java/org/opendaylight/ovsdb/southbound/OvsdbOperGlobalListener.java

   1 /*
   2  * Copyright (c) 2019 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.ovsdb.southbound;
  10
  11 import java.util.Collection;
  12 import java.util.concurrent.ConcurrentHashMap;
  13 import java.util.concurrent.ConcurrentMap;
  14
  15 import org.opendaylight.controller.md.sal.binding.api.ClusteredDataTreeChangeListener;
  16 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  17 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  18 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
  19 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  20 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  21 import org.opendaylight.ovsdb.southbound.transactions.md.TransactionInvoker;
  22 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  23 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  24 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  25 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  26 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  27 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 public class OvsdbOperGlobalListener implements ClusteredDataTreeChangeListener<Node>, AutoCloseable {
  32
  33     private static final Logger LOG = LoggerFactory.getLogger(OvsdbOperGlobalListener.class);
  34     private ListenerRegistration<OvsdbOperGlobalListener> registration;
  35     private DataBroker db;
  36     public static final ConcurrentMap<InstanceIdentifier<Node>, Node> OPER_NODE_CACHE = new ConcurrentHashMap<>();
  37     private final OvsdbConnectionManager ovsdbConnectionManager;
  38     private final TransactionInvoker txInvoker;
  39
  40
  41     OvsdbOperGlobalListener(DataBroker db, OvsdbConnectionManager ovsdbConnectionManager,
  42                             TransactionInvoker txInvoker) {
  43         LOG.info("Registering OvsdbOperGlobalListener");
  44         this.db = db;
  45         this.ovsdbConnectionManager = ovsdbConnectionManager;
  46         this.txInvoker = txInvoker;
  47         registerListener();
  48     }
  49
  50     public void registerListener() {
  51         DataTreeIdentifier<Node> treeId =
  52                 new DataTreeIdentifier<Node>(LogicalDatastoreType.OPERATIONAL, getWildcardPath());
  53         registration = db.registerDataTreeChangeListener(treeId, this);
  54     }
  55
  56     @Override
  57     public void close() {
  58         if (registration != null) {
  59             registration.close();
  60             LOG.info("OVSDB Oper Node listener has been closed.");
  61         }
  62     }
  63
  64     @Override
  65     @SuppressWarnings("checkstyle:IllegalCatch")
  66     public void onDataTreeChanged(Collection<DataTreeModification<Node>> changes) {
  67         changes.forEach((change) -> {
  68             try {
  69                 InstanceIdentifier<Node> key = change.getRootPath().getRootIdentifier();
  70                 DataObjectModification<Node> mod = change.getRootNode();
  71                 Node addNode = getCreated(mod);
  72                 if (addNode != null) {
  73                     OPER_NODE_CACHE.put(key, addNode);
  74                     LOG.info("Node added to oper {}", SouthboundUtil.getOvsdbNodeId(key));
  75                 }
  76                 Node removedNode = getRemoved(mod);
  77                 if (removedNode != null) {
  78                     OPER_NODE_CACHE.remove(key);
  79                     LOG.info("Node deleted from oper {}", SouthboundUtil.getOvsdbNodeId(key));
  80
  81                     OvsdbConnectionInstance connectionInstance = ovsdbConnectionManager.getConnectionInstance(key);
  82                     if (connectionInstance != null && connectionInstance.isActive()
  83                             && connectionInstance.getHasDeviceOwnership() != null
  84                             && connectionInstance.getHasDeviceOwnership()) {
  85                         //Oops some one deleted the node held by me This should never happen.
  86                         //put the node back in oper
  87                         txInvoker.invoke(transaction -> {
  88                             transaction.put(LogicalDatastoreType.OPERATIONAL, key, removedNode);
  89                         });
  90
  91                     }
  92                 }
  93
  94                 Node modifiedNode = getUpdated(mod);
  95                 if (modifiedNode != null) {
  96                     OPER_NODE_CACHE.put(key, modifiedNode);
  97                 }
  98             } catch (Exception e) {
  99                 LOG.error("Failed to handle oper node ", e);
 100             }
 101         });
 102     }
 103
 104
 105
 106     private Node getCreated(DataObjectModification<Node> mod) {
 107         if ((mod.getModificationType() == DataObjectModification.ModificationType.WRITE)
 108                 && (mod.getDataBefore() == null)) {
 109             return mod.getDataAfter();
 110         }
 111         return null;
 112     }
 113
 114     private Node getRemoved(DataObjectModification<Node> mod) {
 115         if (mod.getModificationType() == DataObjectModification.ModificationType.DELETE) {
 116             return mod.getDataBefore();
 117         }
 118         return null;
 119     }
 120
 121     private Node getUpdated(DataObjectModification<Node> mod) {
 122         Node node = null;
 123         switch (mod.getModificationType()) {
 124             case SUBTREE_MODIFIED:
 125                 node = mod.getDataAfter();
 126                 break;
 127             case WRITE:
 128                 if (mod.getDataBefore() !=  null) {
 129                     node = mod.getDataAfter();
 130                 }
 131                 break;
 132             default:
 133                 break;
 134         }
 135         return node;
 136     }
 137
 138     private InstanceIdentifier<Node> getWildcardPath() {
 139         InstanceIdentifier<Node> path = InstanceIdentifier
 140                 .create(NetworkTopology.class)
 141                 .child(Topology.class, new TopologyKey(SouthboundConstants.OVSDB_TOPOLOGY_ID))
 142                 .child(Node.class);
 143         return path;
 144     }
 145
 146 }