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
  40     @Override
  41     public void submitNotification(final DataChangeListenerRegistration<?> listener,
  42             final DOMImmutableDataChangeEvent notification) {
  43         LOG.debug("Notifying listener {} about {}", listener.getInstance(), notification);
  44
  45         listener.getInstance().onDataChanged(notification);
  46     }
  47
  48     @Override
  49     public void submitNotifications(final DataChangeListenerRegistration<?> listener,
  50             final Iterable<DOMImmutableDataChangeEvent> notifications) {
  51         final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> instance = listener.getInstance();
  52         LOG.debug("Notifying listener {} about {}", instance, notifications);
  53
  54         for (DOMImmutableDataChangeEvent n : notifications) {
  55             instance.onDataChanged(n);
  56         }
  57     }
  58
  59     @Override
  60     public void publishChanges(DataTreeCandidate candidate, String logContext) {
  61         ResolveDataChangeEventsTask.create(candidate, dataChangeListenerTree).resolve(this);
  62     }
  63
  64     @Override
  65     public void registerDataChangeListener(YangInstanceIdentifier path,
  66             AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener, DataChangeScope scope,
  67             Optional<DataTreeCandidate> initialState,
  68             Consumer<ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>>
  69                     onRegistration) {
  70         final DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>
  71                 registration = dataChangeListenerTree.registerDataChangeListener(path, listener, scope);
  72
  73         onRegistration.accept(registration);
  74
  75         if (initialState.isPresent()) {
  76             notifySingleListener(path, listener, scope, initialState.get());
  77         }
  78     }
  79
  80     static void notifySingleListener(final YangInstanceIdentifier path,
  81             final AsyncDataChangeListener<YangInstanceIdentifier,NormalizedNode<?, ?>> listener,
  82             final DataChangeScope scope, final DataTreeCandidate initialState) {
  83         DefaultShardDataChangeListenerPublisher publisher = new DefaultShardDataChangeListenerPublisher();
  84         publisher.registerDataChangeListener(path, listener, scope, Optional.absent(), noop -> { });
  85         publisher.publishChanges(initialState, "");
  86     }
  87 }