opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/utils/MockDataTreeChangeListener.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.utils;
   9
  10 import com.google.common.collect.Lists;
  11 import com.google.common.util.concurrent.Uninterruptibles;
  12 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  13 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  14
  15 import javax.annotation.Nonnull;
  16 import java.util.Collection;
  17 import java.util.Collections;
  18 import java.util.List;
  19 import java.util.concurrent.CountDownLatch;
  20 import java.util.concurrent.TimeUnit;
  21
  22 import static org.junit.Assert.assertEquals;
  23 import static org.junit.Assert.fail;
  24
  25 public class MockDataTreeChangeListener implements DOMDataTreeChangeListener {
  26
  27     private final List<Collection<DataTreeCandidate>> changeList =
  28             Collections.synchronizedList(Lists.<Collection<DataTreeCandidate>>newArrayList());
  29
  30     private volatile CountDownLatch changeLatch;
  31     private int expChangeEventCount;
  32
  33     public MockDataTreeChangeListener(int expChangeEventCount) {
  34         reset(expChangeEventCount);
  35     }
  36
  37     public void reset(int expChangeEventCount) {
  38         changeLatch = new CountDownLatch(expChangeEventCount);
  39         this.expChangeEventCount = expChangeEventCount;
  40         changeList.clear();
  41     }
  42
  43     @Override
  44     public void onDataTreeChanged(@Nonnull final Collection<DataTreeCandidate> changes) {
  45         changeList.add(changes);
  46         changeLatch.countDown();
  47     }
  48
  49     public void waitForChangeEvents() {
  50         boolean done = Uninterruptibles.awaitUninterruptibly(changeLatch, 5, TimeUnit.SECONDS);
  51         if(!done) {
  52             fail(String.format("Missing change notifications. Expected: %d. Actual: %d",
  53                     expChangeEventCount, (expChangeEventCount - changeLatch.getCount())));
  54         }
  55     }
  56
  57     public void expectNoMoreChanges(String assertMsg) {
  58         Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
  59         assertEquals(assertMsg, expChangeEventCount, changeList.size());
  60     }
  61 }