opendaylight/md-sal/samples/clustering-test-app/provider/src/main/java/org/opendaylight/controller/clustering/it/provider/impl/IdIntsDOMDataTreeLIstener.java

   1 /*
   2  * Copyright (c) 2017 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
   9 package org.opendaylight.controller.clustering.it.provider.impl;
  10
  11 import com.google.common.base.Preconditions;
  12 import java.util.Collection;
  13 import java.util.Map;
  14 import javax.annotation.Nonnull;
  15 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  16 import org.opendaylight.mdsal.dom.api.DOMDataTreeListener;
  17 import org.opendaylight.mdsal.dom.api.DOMDataTreeListeningException;
  18 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  19 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 public class IdIntsDOMDataTreeLIstener implements DOMDataTreeListener {
  24
  25     private static final Logger LOG = LoggerFactory.getLogger(IdIntsDOMDataTreeLIstener.class);
  26
  27     private NormalizedNode<?, ?> localCopy = null;
  28
  29     @Override
  30     public void onDataTreeChanged(@Nonnull final Collection<DataTreeCandidate> changes,
  31                                   @Nonnull final Map<DOMDataTreeIdentifier, NormalizedNode<?, ?>> subtrees) {
  32
  33         // There should only be one candidate reported
  34         Preconditions.checkState(changes.size() == 1);
  35
  36         // do not log the change into debug, only use trace since it will lead to OOM on default heap settings
  37         LOG.debug("Received data tree changed");
  38
  39         changes.forEach(change -> {
  40             if (change.getRootNode().getDataAfter().isPresent()) {
  41                 LOG.trace("Received change, data before: {}, data after: {}",
  42                         change.getRootNode().getDataBefore().isPresent()
  43                                 ? change.getRootNode().getDataBefore().get() : "",
  44                         change.getRootNode().getDataAfter().get());
  45
  46                 if (localCopy == null || checkEqual(change.getRootNode().getDataBefore().get())) {
  47                     localCopy = change.getRootNode().getDataAfter().get();
  48                 } else {
  49                     LOG.warn("Ignoring notification.");
  50                     LOG.trace("Ignored notification content: {}", change);
  51                 }
  52             } else {
  53                 LOG.warn("getDataAfter() is missing from notification. change: {}", change);
  54             }
  55         });
  56     }
  57
  58     @Override
  59     public void onDataTreeFailed(@Nonnull Collection<DOMDataTreeListeningException> causes) {
  60
  61     }
  62
  63     public boolean hasTriggered() {
  64         return localCopy != null;
  65     }
  66
  67     public boolean checkEqual(final NormalizedNode<?, ?> expected) {
  68         return localCopy.equals(expected);
  69     }
  70 }