applications/notification-supplier/src/main/java/org/opendaylight/openflowplugin/applications/notification/supplier/impl/AbstractNotificationSupplierForItemRoot.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 package org.opendaylight.openflowplugin.applications.notification.supplier.impl;
   9
  10 import com.google.common.base.Preconditions;
  11 import java.util.Collection;
  12 import org.opendaylight.mdsal.binding.api.DataBroker;
  13 import org.opendaylight.mdsal.binding.api.DataObjectModification;
  14 import org.opendaylight.mdsal.binding.api.DataTreeModification;
  15 import org.opendaylight.mdsal.binding.api.NotificationPublishService;
  16 import org.opendaylight.openflowplugin.applications.notification.supplier.NotificationSupplierForItemRoot;
  17 import org.opendaylight.yangtools.yang.binding.DataObject;
  18 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  19 import org.opendaylight.yangtools.yang.binding.Notification;
  20
  21 /**
  22  * Class is package protected abstract implementation for all Root Items
  23  * Notification Suppliers.
  24  *
  25  * @param <O> - data tree item Object
  26  * @param <C> - Create notification
  27  * @param <D> - Delete notification
  28  */
  29 public abstract class AbstractNotificationSupplierForItemRoot<O extends DataObject, C extends Notification, D extends
  30         Notification> extends AbstractNotificationSupplierBase<O> implements NotificationSupplierForItemRoot<O, C, D> {
  31
  32     private final NotificationPublishService notificationProviderService;
  33
  34     /**
  35      * Default constructor for all Root Item Notification Supplier implementation.
  36      *
  37      * @param notificationProviderService - notification publisher
  38      * @param db                          - DataBroker for DataTreeChangeListener registration
  39      * @param clazz                       - Statistics Notification Class
  40      */
  41     public AbstractNotificationSupplierForItemRoot(final NotificationPublishService notificationProviderService,
  42                                                    final DataBroker db, final Class<O> clazz) {
  43         super(db, clazz);
  44         this.notificationProviderService = Preconditions.checkNotNull(notificationProviderService);
  45     }
  46
  47     @Override
  48     public void onDataTreeChanged(Collection<DataTreeModification<O>> changes) {
  49
  50         Preconditions.checkNotNull(changes, "Changes may not be null!");
  51
  52         for (DataTreeModification<O> change : changes) {
  53             final InstanceIdentifier<O> key = change.getRootPath().getRootIdentifier();
  54             final DataObjectModification<O> mod = change.getRootNode();
  55             switch (mod.getModificationType()) {
  56                 case DELETE:
  57                     remove(key, mod.getDataBefore());
  58                     break;
  59                 case SUBTREE_MODIFIED:
  60                     update(key, mod.getDataBefore(), mod.getDataAfter());
  61                     break;
  62                 case WRITE:
  63                     if (mod.getDataBefore() == null) {
  64                         add(key, mod.getDataAfter());
  65                     } else {
  66                         update(key, mod.getDataBefore(), mod.getDataAfter());
  67                     }
  68                     break;
  69                 default:
  70                     throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
  71             }
  72         }
  73     }
  74
  75
  76     public void add(InstanceIdentifier<O> identifier, O add) {
  77         putNotification(createNotification(add, identifier));
  78     }
  79
  80     public void remove(InstanceIdentifier<O> identifier, O del) {
  81         putNotification(deleteNotification(identifier.firstIdentifierOf(clazz)));
  82     }
  83
  84     public void update(InstanceIdentifier<O> identifier, O before, O after) {
  85         //EMPTY NO-OP
  86     }
  87
  88     private void putNotification(Notification notif) {
  89         if (notif != null) {
  90             try {
  91                 notificationProviderService.putNotification(notif);
  92             } catch (InterruptedException e) {
  93                 throw new IllegalStateException("Interrupted while publishing " + notif, e);
  94             }
  95         }
  96     }
  97 }
  98