applications/notification-supplier/src/main/java/org/opendaylight/openflowplugin/applications/notification/supplier/impl/item/stat/AbstractNotificationSupplierForItemStat.java

   1 /*
   2  * Copyright (c) 2015 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
   9 package org.opendaylight.openflowplugin.applications.notification.supplier.impl.item.stat;
  10
  11 import com.google.common.base.Preconditions;
  12 import java.util.Collection;
  13 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  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.sal.binding.api.NotificationProviderService;
  17 import org.opendaylight.openflowplugin.applications.notification.supplier.NotificationSupplierForItemStat;
  18 import org.opendaylight.openflowplugin.applications.notification.supplier.impl.AbstractNotificationSupplierBase;
  19 import org.opendaylight.yangtools.yang.binding.DataObject;
  20 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  21 import org.opendaylight.yangtools.yang.binding.Notification;
  22
  23 /**
  24  * Class is package protected abstract implementation for all Old Statistics
  25  * Notification Suppliers.
  26  *
  27  * @param <O> - Statistics {@link DataObject}
  28  * @param <N> - Statistics Notification
  29  */
  30 public abstract class AbstractNotificationSupplierForItemStat<O extends DataObject, N extends Notification> extends
  31         AbstractNotificationSupplierBase<O> implements NotificationSupplierForItemStat<O, N> {
  32
  33     private final NotificationProviderService notifProviderService;
  34
  35     /**
  36      * Default constructor for all Statistic Notification Supplier implementation.
  37      *
  38      * @param notifProviderService - notification publisher
  39      * @param db                   - DataBroker for DataTreeChangeListener registration
  40      * @param clazz                - Statistics Notification Class
  41      */
  42     public AbstractNotificationSupplierForItemStat(final NotificationProviderService notifProviderService,
  43                                                    final DataBroker db, final Class<O> clazz) {
  44         super(db, clazz);
  45         this.notifProviderService = Preconditions.checkNotNull(notifProviderService);
  46     }
  47
  48     @Override
  49     public void onDataTreeChanged(Collection<DataTreeModification<O>> changes) {
  50
  51         Preconditions.checkNotNull(changes, "Changes may not be null!");
  52
  53         for (DataTreeModification<O> change : changes) {
  54             final InstanceIdentifier<O> key = change.getRootPath().getRootIdentifier();
  55             final DataObjectModification<O> mod = change.getRootNode();
  56             switch (mod.getModificationType()) {
  57                 case DELETE:
  58                     remove(key, mod.getDataBefore());
  59                     break;
  60                 case SUBTREE_MODIFIED:
  61                     update(key, mod.getDataBefore(), mod.getDataAfter());
  62                     break;
  63                 case WRITE:
  64                     if (mod.getDataBefore() == null) {
  65                         add(key, mod.getDataAfter());
  66                     } else {
  67                         update(key, mod.getDataBefore(), mod.getDataAfter());
  68                     }
  69                     break;
  70                 default:
  71                     throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
  72             }
  73         }
  74     }
  75
  76
  77     public void add(InstanceIdentifier<O> identifier, O add) {
  78         final N notif = createNotification(add, identifier);
  79         if (notif != null) {
  80             notifProviderService.publish(notif);
  81         }
  82     }
  83
  84     public void remove(InstanceIdentifier<O> identifier, O del) {
  85         //EMPTY NO-OP
  86     }
  87
  88     public void update(InstanceIdentifier<O> identifier, O before, O after) {
  89         //EMPTY NO-OP
  90     }
  91 }
  92