opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DefaultShardDataChangeListenerPublisher.java

   1 /*
   2  * Copyright (c) 2016 Brocade Communications 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.controller.cluster.datastore;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.function.Consumer;
  12 import javax.annotation.concurrent.NotThreadSafe;
  13 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker.DataChangeScope;
  14 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
  15 import org.opendaylight.controller.md.sal.dom.store.impl.DOMImmutableDataChangeEvent;
  16 import org.opendaylight.controller.md.sal.dom.store.impl.DataChangeListenerRegistration;
  17 import org.opendaylight.controller.md.sal.dom.store.impl.ResolveDataChangeEventsTask;
  18 import org.opendaylight.controller.md.sal.dom.store.impl.tree.ListenerTree;
  19 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  20 import org.opendaylight.yangtools.util.concurrent.NotificationManager;
  21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  22 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  23 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 /**
  28  * Default implementation of ShardDataChangeListenerPublisher that directly generates and publishes
  29  * notifications for DataChangeListeners.
  30  *
  31  * @author Thomas Pantelis
  32  */
  33 @NotThreadSafe
  34 final class DefaultShardDataChangeListenerPublisher implements ShardDataChangeListenerPublisher,
  35         NotificationManager<DataChangeListenerRegistration<?>, DOMImmutableDataChangeEvent> {
  36     private static final Logger LOG = LoggerFactory.getLogger(DefaultShardDataChangeListenerPublisher.class);
  37
  38     private final ListenerTree dataChangeListenerTree = ListenerTree.create();
  39     private final String logContext;
  40
  41     DefaultShardDataChangeListenerPublisher(String logContext) {
  42         this.logContext = logContext;
  43     }
  44
  45     @Override
  46     public void submitNotification(final DataChangeListenerRegistration<?> listener,
  47             final DOMImmutableDataChangeEvent notification) {
  48         LOG.debug("{}: Notifying listener {} about {}", logContext, listener.getInstance(), notification);
  49
  50         listener.getInstance().onDataChanged(notification);
  51     }
  52
  53     @Override
  54     public void submitNotifications(final DataChangeListenerRegistration<?> listener,
  55             final Iterable<DOMImmutableDataChangeEvent> notifications) {
  56         final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> instance = listener.getInstance();
  57         LOG.debug("{}: Notifying listener {} about {}", logContext, instance, notifications);
  58
  59         for (DOMImmutableDataChangeEvent n : notifications) {
  60             instance.onDataChanged(n);
  61         }
  62     }
  63
  64     @Override
  65     public void publishChanges(DataTreeCandidate candidate) {
  66         ResolveDataChangeEventsTask.create(candidate, dataChangeListenerTree).resolve(this);
  67     }
  68
  69     @Override
  70     public void registerDataChangeListener(YangInstanceIdentifier path,
  71             AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener, DataChangeScope scope,
  72             Optional<DataTreeCandidate> initialState,
  73             Consumer<ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>>
  74                     onRegistration) {
  75         final DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>
  76                 registration = dataChangeListenerTree.registerDataChangeListener(path, listener, scope);
  77
  78         onRegistration.accept(registration);
  79
  80         if (initialState.isPresent()) {
  81             notifySingleListener(path, listener, scope, initialState.get(), logContext);
  82         }
  83     }
  84
  85     static void notifySingleListener(final YangInstanceIdentifier path,
  86             final AsyncDataChangeListener<YangInstanceIdentifier,NormalizedNode<?, ?>> listener,
  87             final DataChangeScope scope, final DataTreeCandidate initialState, String logContext) {
  88         DefaultShardDataChangeListenerPublisher publisher = new DefaultShardDataChangeListenerPublisher(logContext);
  89         publisher.registerDataChangeListener(path, listener, scope, Optional.absent(), noop -> { });
  90         publisher.publishChanges(initialState);
  91     }
  92 }