opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DefaultShardDataTreeChangeListenerPublisher.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.controller.cluster.datastore;
   9
  10 import java.util.Collection;
  11 import java.util.Optional;
  12 import java.util.function.Consumer;
  13 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
  14 import org.opendaylight.mdsal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration;
  15 import org.opendaylight.mdsal.dom.spi.store.AbstractDOMStoreTreeChangePublisher;
  16 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  17 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  18 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * Default implementation of ShardDataTreeChangeListenerPublisher that directly generates and publishes
  24  * notifications for DataTreeChangeListeners. This class is NOT thread-safe.
  25  *
  26  * @author Thomas Pantelis
  27  */
  28 final class DefaultShardDataTreeChangeListenerPublisher extends AbstractDOMStoreTreeChangePublisher
  29         implements ShardDataTreeChangeListenerPublisher {
  30     private static final Logger LOG = LoggerFactory.getLogger(DefaultShardDataTreeChangeListenerPublisher.class);
  31     private String logContext;
  32
  33     DefaultShardDataTreeChangeListenerPublisher(final String logContext) {
  34         this.logContext = logContext;
  35     }
  36
  37     @Override
  38     public void publishChanges(final DataTreeCandidate candidate) {
  39         if (LOG.isTraceEnabled()) {
  40             LOG.trace("{}: publishChanges: {}", logContext, candidate);
  41         } else {
  42             LOG.debug("{}: publishChanges: rootPath: {}", logContext, candidate.getRootPath());
  43         }
  44
  45         processCandidateTree(candidate);
  46     }
  47
  48     @Override
  49     protected void notifyListener(final AbstractDOMDataTreeChangeListenerRegistration<?> registration,
  50             final Collection<DataTreeCandidate> changes) {
  51         LOG.debug("{}: notifyListener: listener: {}", logContext, registration.getInstance());
  52         registration.getInstance().onDataTreeChanged(changes);
  53     }
  54
  55     @Override
  56     protected void registrationRemoved(final AbstractDOMDataTreeChangeListenerRegistration<?> registration) {
  57         LOG.debug("Registration {} removed", registration);
  58     }
  59
  60     @Override
  61     public void registerTreeChangeListener(final YangInstanceIdentifier treeId,
  62             final DOMDataTreeChangeListener listener, final Optional<DataTreeCandidate> initialState,
  63             final Consumer<ListenerRegistration<DOMDataTreeChangeListener>> onRegistration) {
  64         registerTreeChangeListener(treeId, listener, onRegistration);
  65
  66         if (initialState.isPresent()) {
  67             notifySingleListener(treeId, listener, initialState.get(), logContext);
  68         } else {
  69             listener.onInitialData();
  70         }
  71     }
  72
  73     void registerTreeChangeListener(final YangInstanceIdentifier treeId, final DOMDataTreeChangeListener listener,
  74             final Consumer<ListenerRegistration<DOMDataTreeChangeListener>> onRegistration) {
  75         LOG.debug("{}: registerTreeChangeListener: path: {}, listener: {}", logContext, treeId, listener);
  76
  77         AbstractDOMDataTreeChangeListenerRegistration<DOMDataTreeChangeListener> registration =
  78                 super.registerTreeChangeListener(treeId, listener);
  79
  80         onRegistration.accept(registration);
  81     }
  82
  83     static void notifySingleListener(final YangInstanceIdentifier treeId, final DOMDataTreeChangeListener listener,
  84             final DataTreeCandidate state, final String logContext) {
  85         LOG.debug("{}: notifySingleListener: path: {}, listener: {}", logContext, treeId, listener);
  86         DefaultShardDataTreeChangeListenerPublisher publisher =
  87                 new DefaultShardDataTreeChangeListenerPublisher(logContext);
  88         publisher.logContext = logContext;
  89         publisher.registerTreeChangeListener(treeId, listener);
  90
  91         if (!publisher.processCandidateTree(state)) {
  92             listener.onInitialData();
  93         }
  94     }
  95 }