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