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 com.google.common.base.Optional;
  11 import java.util.Collection;
  12 import java.util.function.Consumer;
  13 import javax.annotation.concurrent.NotThreadSafe;
  14 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
  15 import org.opendaylight.mdsal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration;
  16 import org.opendaylight.mdsal.dom.spi.store.AbstractDOMStoreTreeChangePublisher;
  17 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  19 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 /**
  24  * Default implementation of ShardDataTreeChangeListenerPublisher that directly generates and publishes
  25  * notifications for DataTreeChangeListeners.
  26  *
  27  * @author Thomas Pantelis
  28  */
  29 @NotThreadSafe
  30 final class DefaultShardDataTreeChangeListenerPublisher extends AbstractDOMStoreTreeChangePublisher
  31         implements ShardDataTreeChangeListenerPublisher {
  32     private static final Logger LOG = LoggerFactory.getLogger(DefaultShardDataTreeChangeListenerPublisher.class);
  33     private String logContext;
  34
  35     DefaultShardDataTreeChangeListenerPublisher(String logContext) {
  36         this.logContext = logContext;
  37     }
  38
  39     @Override
  40     public void publishChanges(final DataTreeCandidate candidate) {
  41         if (LOG.isTraceEnabled()) {
  42             LOG.trace("{}: publishChanges: {}", logContext, candidate);
  43         } else {
  44             LOG.debug("{}: publishChanges: rootPath: {}", logContext, candidate.getRootPath());
  45         }
  46
  47         processCandidateTree(candidate);
  48     }
  49
  50     @Override
  51     protected void notifyListener(AbstractDOMDataTreeChangeListenerRegistration<?> registration,
  52             Collection<DataTreeCandidate> changes) {
  53         LOG.debug("{}: notifyListener: listener: {}", logContext, registration.getInstance());
  54         registration.getInstance().onDataTreeChanged(changes);
  55     }
  56
  57     @Override
  58     protected void registrationRemoved(final AbstractDOMDataTreeChangeListenerRegistration<?> registration) {
  59         LOG.debug("Registration {} removed", registration);
  60     }
  61
  62     @Override
  63     public void registerTreeChangeListener(YangInstanceIdentifier treeId, DOMDataTreeChangeListener listener,
  64             Optional<DataTreeCandidate> initialState,
  65             Consumer<ListenerRegistration<DOMDataTreeChangeListener>> onRegistration) {
  66         LOG.debug("{}: registerTreeChangeListener: path: {}, listener: {}", logContext, treeId, listener);
  67
  68         AbstractDOMDataTreeChangeListenerRegistration<DOMDataTreeChangeListener> registration =
  69                 super.registerTreeChangeListener(treeId, listener);
  70
  71         onRegistration.accept(registration);
  72
  73         if (initialState.isPresent()) {
  74             notifySingleListener(treeId, listener, initialState.get(), logContext);
  75         }
  76     }
  77
  78     static void notifySingleListener(YangInstanceIdentifier treeId, DOMDataTreeChangeListener listener,
  79             DataTreeCandidate state, String logContext) {
  80         LOG.debug("{}: notifySingleListener: path: {}, listener: {}", logContext, treeId, listener);
  81         DefaultShardDataTreeChangeListenerPublisher publisher =
  82                 new DefaultShardDataTreeChangeListenerPublisher(logContext);
  83         publisher.logContext = logContext;
  84         publisher.registerTreeChangeListener(treeId, listener, Optional.absent(), noop -> { /* NOOP */ });
  85         publisher.publishChanges(state);
  86     }
  87 }