elanmanager/impl/src/main/java/org/opendaylight/netvirt/elan/l2gw/listeners/HwvtepConfigNodeCache.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.netvirt.elan.l2gw.listeners;
  10
  11 import java.util.ArrayList;
  12 import java.util.List;
  13 import java.util.Map;
  14 import java.util.concurrent.ConcurrentHashMap;
  15 import javax.annotation.PreDestroy;
  16 import javax.inject.Inject;
  17 import javax.inject.Singleton;
  18 import org.opendaylight.genius.utils.hwvtep.HwvtepSouthboundConstants;
  19 import org.opendaylight.infrautils.utils.concurrent.Executors;
  20 import org.opendaylight.mdsal.binding.api.DataBroker;
  21 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  22 import org.opendaylight.serviceutils.tools.listener.AbstractClusteredAsyncDataTreeChangeListener;
  23 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  24 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  25 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  26 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  27 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 @Singleton
  32 public class HwvtepConfigNodeCache extends AbstractClusteredAsyncDataTreeChangeListener<Node> {
  33     private static final Logger LOG = LoggerFactory.getLogger(HwvtepConfigNodeCache.class);
  34
  35     private final DataBroker dataBroker;
  36     private final Map<InstanceIdentifier<Node>, Node> cache = new ConcurrentHashMap<>();
  37     private final Map<InstanceIdentifier<Node>, List<Runnable>> waitList = new ConcurrentHashMap<>();
  38
  39     @Inject
  40     public HwvtepConfigNodeCache(final DataBroker dataBroker) {
  41         super(dataBroker, LogicalDatastoreType.CONFIGURATION, InstanceIdentifier.create(NetworkTopology.class)
  42                 .child(Topology.class, new TopologyKey(HwvtepSouthboundConstants.HWVTEP_TOPOLOGY_ID))
  43                 .child(Node.class), Executors.newListeningSingleThreadExecutor("HwvtepConfigNodeCache", LOG));
  44         this.dataBroker = dataBroker;
  45     }
  46
  47     public void init() {
  48         LOG.info("{} init", getClass().getSimpleName());
  49     }
  50
  51     @Override
  52     @PreDestroy
  53     public void close() {
  54         super.close();
  55         Executors.shutdownAndAwaitTermination(getExecutorService());
  56     }
  57
  58     @Override
  59     public void remove(InstanceIdentifier<Node> key, Node deleted) {
  60         cache.remove(key);
  61     }
  62
  63     @Override
  64     public void update(InstanceIdentifier<Node> key, Node old, Node added) {
  65         cache.put(key, added);
  66     }
  67
  68     @Override
  69     public synchronized void add(InstanceIdentifier<Node> key, Node added) {
  70         cache.put(key, added);
  71         if (waitList.containsKey(key)) {
  72             waitList.remove(key).stream().forEach(runnable -> runnable.run());
  73         }
  74     }
  75
  76     public Node getConfigNode(InstanceIdentifier<Node> key) {
  77         return cache.get(key);
  78     }
  79
  80     public synchronized void runAfterNodeAvailable(InstanceIdentifier<Node> key, Runnable runnable) {
  81         if (cache.containsKey(key)) {
  82             runnable.run();
  83         } else {
  84             waitList.putIfAbsent(key, new ArrayList<>());
  85             waitList.get(key).add(runnable);
  86         }
  87     }
  88 }