openstack/net-virt-sfc/impl/src/main/java/org/opendaylight/ovsdb/openstack/netvirt/sfc/AbstractDataTreeListener.java

   1 /*
   2  * Copyright (c) 2013, 2015 Dell, 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
   9 package org.opendaylight.ovsdb.openstack.netvirt.sfc;
  10
  11 import java.util.Collection;
  12
  13 import com.google.common.base.Preconditions;
  14 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  15 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  16 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
  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 AsyncDataChangeEvent} processing for
  24  * netvirt-sfc data change listener.
  25  */
  26 public abstract class AbstractDataTreeListener<T extends DataObject> implements INetvirtSfcDataProcessor<T> {
  27     private static final Logger LOG = LoggerFactory.getLogger(AbstractDataTreeListener.class);
  28     protected INetvirtSfcOF13Provider provider;
  29     protected final Class<T> clazz;
  30
  31     public AbstractDataTreeListener(INetvirtSfcOF13Provider provider, Class<T> clazz) {
  32         this.provider = Preconditions.checkNotNull(provider, "provider can not be null!");
  33         this.clazz = Preconditions.checkNotNull(clazz, "Class can not be null!");
  34     }
  35
  36     @Override
  37     public void onDataTreeChanged(Collection<DataTreeModification<T>> changes) {
  38         Preconditions.checkNotNull(changes, "Changes may not be null!");
  39
  40         LOG.info("Received Data Tree Changed ...", changes);
  41         for (DataTreeModification<T> change : changes) {
  42             final InstanceIdentifier<T> key = change.getRootPath().getRootIdentifier();
  43             final DataObjectModification<T> mod = change.getRootNode();
  44             LOG.info("Received Data Tree Changed Update of Type={} for Key={}", mod.getModificationType(), key);
  45             switch (mod.getModificationType()) {
  46                 case DELETE:
  47                     remove(key, mod.getDataBefore());
  48                     break;
  49                 case SUBTREE_MODIFIED:
  50                     update(key, mod.getDataBefore(), mod.getDataAfter());
  51                     break;
  52                 case WRITE:
  53                     if (mod.getDataBefore() == null) {
  54                         add(key, mod.getDataAfter());
  55                     } else {
  56                         update(key, mod.getDataBefore(), mod.getDataAfter());
  57                     }
  58                     break;
  59                 default:
  60                     throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
  61             }
  62         }
  63     }
  64 }