applications/forwardingrules-manager/src/main/java/org/opendaylight/openflowplugin/applications/frm/impl/AbstractListeningCommiter.java

   1 /**
   2  * Copyright (c) 2014, 2017 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.frm.impl;
   9
  10 import com.google.common.base.Preconditions;
  11 import java.util.Collection;
  12 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  13 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  14 import org.opendaylight.openflowplugin.applications.frm.ForwardingRulesCommiter;
  15 import org.opendaylight.openflowplugin.applications.frm.ForwardingRulesManager;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNode;
  17 import org.opendaylight.yangtools.yang.binding.DataObject;
  18 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * AbstractChangeListner implemented basic {@link org.opendaylight.controller.md.sal.binding.api.DataTreeModification}
  24  * processing for flow node subDataObject (flows, groups and meters).
  25  */
  26 public abstract class AbstractListeningCommiter<T extends DataObject> implements ForwardingRulesCommiter<T> {
  27
  28     private static final Logger LOG = LoggerFactory.getLogger(AbstractListeningCommiter.class);
  29     ForwardingRulesManager provider;
  30
  31     public AbstractListeningCommiter(ForwardingRulesManager provider) {
  32         this.provider = Preconditions.checkNotNull(provider, "ForwardingRulesManager can not be null!");
  33     }
  34
  35     @Override
  36     public void onDataTreeChanged(Collection<DataTreeModification<T>> changes) {
  37         Preconditions.checkNotNull(changes, "Changes may not be null!");
  38         LOG.trace("Received data changes :{}", changes);
  39
  40         for (DataTreeModification<T> change : changes) {
  41             final InstanceIdentifier<T> key = change.getRootPath().getRootIdentifier();
  42             final DataObjectModification<T> mod = change.getRootNode();
  43             final InstanceIdentifier<FlowCapableNode> nodeIdent =
  44                     key.firstIdentifierOf(FlowCapableNode.class);
  45             if (preConfigurationCheck(nodeIdent)) {
  46                 switch (mod.getModificationType()) {
  47                     case DELETE:
  48                         remove(key, mod.getDataBefore(), nodeIdent);
  49                         break;
  50                     case SUBTREE_MODIFIED:
  51                         update(key, mod.getDataBefore(), mod.getDataAfter(), nodeIdent);
  52                         break;
  53                     case WRITE:
  54                         if (mod.getDataBefore() == null) {
  55                             add(key, mod.getDataAfter(), nodeIdent);
  56                         } else {
  57                             update(key, mod.getDataBefore(), mod.getDataAfter(), nodeIdent);
  58                         }
  59                         break;
  60                     default:
  61                         throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
  62                 }
  63             } else {
  64                 if (provider.isStaleMarkingEnabled()) {
  65                     LOG.info("Stale-Marking ENABLED and switch {} is NOT connected, storing stale entities",
  66                             nodeIdent.toString());
  67                     // Switch is NOT connected
  68                     switch (mod.getModificationType()) {
  69                         case DELETE:
  70                             createStaleMarkEntity(key, mod.getDataBefore(), nodeIdent);
  71                             break;
  72                         case SUBTREE_MODIFIED:
  73                             break;
  74                         case WRITE:
  75                             break;
  76                         default:
  77                             throw new
  78                             IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
  79                     }
  80                 }
  81             }
  82         }
  83     }
  84
  85     /**
  86      * Method return wildCardPath for Listener registration
  87      * and for identify the correct KeyInstanceIdentifier from data.
  88      */
  89     protected abstract InstanceIdentifier<T> getWildCardPath();
  90
  91     private boolean preConfigurationCheck(final InstanceIdentifier<FlowCapableNode> nodeIdent) {
  92         Preconditions.checkNotNull(nodeIdent, "FlowCapableNode identifier can not be null!");
  93         // In single node cluster, node should be in local cache before we get any flow/group/meter
  94         // data change event from data store. So first check should pass.
  95         // In case of 3-node cluster, when shard leader changes, clustering will send blob of data
  96         // present in operational data store and config data store. So ideally local node cache
  97         // should get populated. But to handle a scenario where flow request comes before the blob
  98         // of config/operational data gets processes, it won't find node in local cache and it will
  99         // skip the flow/group/meter operational. This requires an addition check, where it reads
 100         // node from operational data store and if it's present it calls flowNodeConnected to explicitly
 101         // trigger the event of new node connected.
 102         return provider.isNodeOwner(nodeIdent)
 103                 && (provider.isNodeActive(nodeIdent) || provider.checkNodeInOperationalDataStore(nodeIdent));
 104     }
 105 }
 106