applications/topology-manager/src/main/java/org/opendaylight/openflowplugin/applications/topology/manager/FlowCapableTopologyProvider.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. 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 package org.opendaylight.openflowplugin.applications.topology.manager;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.concurrent.ExecutionException;
  12 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  13 import org.opendaylight.controller.md.sal.binding.api.ReadTransaction;
  14 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
  15 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  16 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  17 import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
  18 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
  19 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
  20 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  21 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  23 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  24 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  25 import org.opendaylight.yangtools.yang.binding.NotificationListener;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 public class FlowCapableTopologyProvider implements AutoCloseable {
  30     private static final Logger LOG = LoggerFactory.getLogger(FlowCapableTopologyProvider.class);
  31     static final String TOPOLOGY_ID = "flow:1";
  32
  33     private final DataBroker dataBroker;
  34     private final NotificationProviderService notificationService;
  35     private final OperationProcessor processor;
  36     private ListenerRegistration<NotificationListener> listenerRegistration;
  37
  38     public FlowCapableTopologyProvider(DataBroker dataBroker, NotificationProviderService notificationService,
  39             OperationProcessor processor) {
  40         this.dataBroker = dataBroker;
  41         this.notificationService = notificationService;
  42         this.processor = processor;
  43     }
  44
  45     /**
  46      * Gets called on start of a bundle.
  47      */
  48     public void start() {
  49         final TopologyKey key = new TopologyKey(new TopologyId(TOPOLOGY_ID));
  50         final InstanceIdentifier<Topology> path = InstanceIdentifier
  51                 .create(NetworkTopology.class)
  52                 .child(Topology.class, key);
  53
  54         final FlowCapableTopologyExporter listener = new FlowCapableTopologyExporter(processor, path);
  55         this.listenerRegistration = notificationService.registerNotificationListener(listener);
  56
  57         if(!isFlowTopologyExist(dataBroker, path)){
  58             final ReadWriteTransaction tx = dataBroker.newReadWriteTransaction();
  59             tx.put(LogicalDatastoreType.OPERATIONAL, path, new TopologyBuilder().setKey(key).build(), true);
  60             try {
  61                 tx.submit().get();
  62             } catch (InterruptedException | ExecutionException e) {
  63                 LOG.warn("Initial topology export failed, continuing anyway", e);
  64             }
  65         }
  66
  67         LOG.info("FlowCapableTopologyProvider started");
  68     }
  69
  70     @Override
  71     public void close() {
  72         LOG.info("FlowCapableTopologyProvider stopped.");
  73         if (this.listenerRegistration != null) {
  74             try {
  75                 this.listenerRegistration.close();
  76             } catch (Exception e) {
  77                 LOG.warn("Failed to close listener registration: {}", e.getMessage());
  78                 LOG.debug("Failed to close listener registration.. ", e);
  79             }
  80             listenerRegistration = null;
  81         }
  82     }
  83
  84     private boolean isFlowTopologyExist(final DataBroker dataBroker,
  85                                         final InstanceIdentifier<Topology> path) {
  86         final ReadTransaction tx = dataBroker.newReadOnlyTransaction();
  87         try {
  88             Optional<Topology> ofTopology = tx.read(LogicalDatastoreType.OPERATIONAL, path).checkedGet();
  89             LOG.debug("OpenFlow topology exist in the operational data store at {}",path);
  90             if(ofTopology.isPresent()){
  91                 return true;
  92             }
  93         } catch (ReadFailedException e) {
  94             LOG.warn("OpenFlow topology read operation failed!", e);
  95         }
  96         return false;
  97     }
  98 }