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.Stopwatch;
  11 import java.util.concurrent.TimeUnit;
  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.util.concurrent.NotificationManager;
  20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  22 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 /**
  27  * Default implementation of ShardDataChangeListenerPublisher that directly generates and publishes
  28  * notifications for DataChangeListeners.
  29  *
  30  * @author Thomas Pantelis
  31  */
  32 @NotThreadSafe
  33 final class DefaultShardDataChangeListenerPublisher implements ShardDataChangeListenerPublisher,
  34         NotificationManager<DataChangeListenerRegistration<?>, DOMImmutableDataChangeEvent> {
  35     private static final Logger LOG = LoggerFactory.getLogger(DefaultShardDataChangeListenerPublisher.class);
  36
  37     private final ListenerTree dataChangeListenerTree = ListenerTree.create();
  38     private final Stopwatch timer = Stopwatch.createUnstarted();
  39
  40     @Override
  41     public void submitNotification(final DataChangeListenerRegistration<?> listener, final DOMImmutableDataChangeEvent notification) {
  42         LOG.debug("Notifying listener {} about {}", listener.getInstance(), notification);
  43
  44         listener.getInstance().onDataChanged(notification);
  45     }
  46
  47     @Override
  48     public void submitNotifications(final DataChangeListenerRegistration<?> listener, final Iterable<DOMImmutableDataChangeEvent> notifications) {
  49         final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> instance = listener.getInstance();
  50         LOG.debug("Notifying listener {} about {}", instance, notifications);
  51
  52         for (DOMImmutableDataChangeEvent n : notifications) {
  53             instance.onDataChanged(n);
  54         }
  55     }
  56
  57     @Override
  58     public void publishChanges(DataTreeCandidate candidate, String logContext) {
  59         timer.start();
  60
  61         try {
  62             ResolveDataChangeEventsTask.create(candidate, dataChangeListenerTree).resolve(this);
  63         } finally {
  64             timer.stop();
  65             long elapsedTime = timer.elapsed(TimeUnit.MILLISECONDS);
  66             if(elapsedTime >= PUBLISH_DELAY_THRESHOLD_IN_MS) {
  67                 LOG.warn("{}: Generation of DataChange events took longer than expected. Elapsed time: {}",
  68                         logContext, timer);
  69             } else {
  70                 LOG.debug("{}: Elapsed time for generation of DataChange events: {}", logContext, timer);
  71             }
  72
  73             timer.reset();
  74         }
  75     }
  76
  77     @Override
  78     public <L extends AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> DataChangeListenerRegistration<L>
  79             registerDataChangeListener(YangInstanceIdentifier path, L listener, DataChangeScope scope) {
  80         return dataChangeListenerTree.registerDataChangeListener(path, listener, scope);
  81     }
  82
  83     @Override
  84     public ShardDataChangeListenerPublisher newInstance() {
  85         return new DefaultShardDataChangeListenerPublisher();
  86     }
  87 }