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 package org.opendaylight.controller.clustering.it.provider.impl;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.util.concurrent.SettableFuture;
  12 import java.util.Collection;
  13 import java.util.Map;
  14 import java.util.concurrent.Executors;
  15 import java.util.concurrent.Future;
  16 import java.util.concurrent.ScheduledExecutorService;
  17 import java.util.concurrent.ScheduledFuture;
  18 import java.util.concurrent.TimeUnit;
  19 import java.util.concurrent.atomic.AtomicLong;
  20 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  21 import org.opendaylight.mdsal.dom.api.DOMDataTreeListener;
  22 import org.opendaylight.mdsal.dom.api.DOMDataTreeListeningException;
  23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  24 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 public class IdIntsDOMDataTreeLIstener implements DOMDataTreeListener {
  29
  30     private static final Logger LOG = LoggerFactory.getLogger(IdIntsDOMDataTreeLIstener.class);
  31     private static final long SECOND_AS_NANO = 1000000000;
  32
  33     private NormalizedNode<?, ?> localCopy = null;
  34     private final AtomicLong lastNotifTimestamp = new AtomicLong(0);
  35     private ScheduledFuture<?> scheduledFuture;
  36     private ScheduledExecutorService executorService;
  37
  38     @Override
  39     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes,
  40                                   final Map<DOMDataTreeIdentifier, NormalizedNode<?, ?>> subtrees) {
  41
  42         // There should only be one candidate reported
  43         Preconditions.checkState(changes.size() == 1);
  44
  45         lastNotifTimestamp.set(System.nanoTime());
  46
  47         // do not log the change into debug, only use trace since it will lead to OOM on default heap settings
  48         LOG.debug("Received data tree changed");
  49
  50         changes.forEach(change -> {
  51             if (change.getRootNode().getDataAfter().isPresent()) {
  52                 LOG.trace("Received change, data before: {}, data after: {}",
  53                         change.getRootNode().getDataBefore().isPresent()
  54                                 ? change.getRootNode().getDataBefore().get() : "",
  55                         change.getRootNode().getDataAfter().get());
  56
  57                 if (localCopy == null || checkEqual(change.getRootNode().getDataBefore().get())) {
  58                     localCopy = change.getRootNode().getDataAfter().get();
  59                 } else {
  60                     LOG.warn("Ignoring notification.");
  61                     LOG.trace("Ignored notification content: {}", change);
  62                 }
  63             } else {
  64                 LOG.warn("getDataAfter() is missing from notification. change: {}", change);
  65             }
  66         });
  67     }
  68
  69     @Override
  70     public void onDataTreeFailed(Collection<DOMDataTreeListeningException> causes) {
  71
  72     }
  73
  74     public boolean hasTriggered() {
  75         return localCopy != null;
  76     }
  77
  78     public Future<Void> tryFinishProcessing() {
  79         executorService = Executors.newSingleThreadScheduledExecutor();
  80         final SettableFuture<Void> settableFuture = SettableFuture.create();
  81
  82         scheduledFuture = executorService.scheduleAtFixedRate(new CheckFinishedTask(settableFuture),
  83                 0, 1, TimeUnit.SECONDS);
  84         return settableFuture;
  85     }
  86
  87     public boolean checkEqual(final NormalizedNode<?, ?> expected) {
  88         return localCopy.equals(expected);
  89     }
  90
  91     private class CheckFinishedTask implements Runnable {
  92
  93         private final SettableFuture<Void> future;
  94
  95         CheckFinishedTask(final SettableFuture<Void> future) {
  96             this.future = future;
  97         }
  98
  99         @Override
 100         public void run() {
 101             if (System.nanoTime() - lastNotifTimestamp.get() > SECOND_AS_NANO * 4) {
 102                 scheduledFuture.cancel(false);
 103                 future.set(null);
 104
 105                 executorService.shutdown();
 106             }
 107         }
 108     }
 109 }