001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.regionserver;
019
020import static org.junit.jupiter.api.Assertions.assertEquals;
021
022import org.apache.hadoop.hbase.testclassification.RegionServerTests;
023import org.apache.hadoop.hbase.testclassification.SmallTests;
024import org.junit.jupiter.api.Tag;
025import org.junit.jupiter.api.Test;
026
027/**
028 * Very basic tests.
029 * @see TestMultiVersionConcurrencyControl for more.
030 */
031@Tag(RegionServerTests.TAG)
032@Tag(SmallTests.TAG)
033public class TestMultiVersionConcurrencyControlBasic {
034
035  @Test
036  public void testSimpleMvccOps() {
037    MultiVersionConcurrencyControl mvcc = new MultiVersionConcurrencyControl();
038    long readPoint = mvcc.getReadPoint();
039    MultiVersionConcurrencyControl.WriteEntry writeEntry = mvcc.begin();
040    mvcc.completeAndWait(writeEntry);
041    assertEquals(readPoint + 1, mvcc.getReadPoint());
042    writeEntry = mvcc.begin();
043    // The write point advances even though we may have 'failed'... call complete on fail.
044    mvcc.complete(writeEntry);
045    assertEquals(readPoint + 2, mvcc.getWritePoint());
046  }
047}