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.Assert.assertEquals;
021
022import org.apache.hadoop.hbase.HBaseClassTestRule;
023import org.apache.hadoop.hbase.testclassification.RegionServerTests;
024import org.apache.hadoop.hbase.testclassification.SmallTests;
025import org.junit.ClassRule;
026import org.junit.Test;
027import org.junit.experimental.categories.Category;
028
029/**
030 * Very basic tests.
031 * @see TestMultiVersionConcurrencyControl for more.
032 */
033@Category({ RegionServerTests.class, SmallTests.class })
034public class TestMultiVersionConcurrencyControlBasic {
035
036  @ClassRule
037  public static final HBaseClassTestRule CLASS_RULE =
038    HBaseClassTestRule.forClass(TestMultiVersionConcurrencyControlBasic.class);
039
040  @Test
041  public void testSimpleMvccOps() {
042    MultiVersionConcurrencyControl mvcc = new MultiVersionConcurrencyControl();
043    long readPoint = mvcc.getReadPoint();
044    MultiVersionConcurrencyControl.WriteEntry writeEntry = mvcc.begin();
045    mvcc.completeAndWait(writeEntry);
046    assertEquals(readPoint + 1, mvcc.getReadPoint());
047    writeEntry = mvcc.begin();
048    // The write point advances even though we may have 'failed'... call complete on fail.
049    mvcc.complete(writeEntry);
050    assertEquals(readPoint + 2, mvcc.getWritePoint());
051  }
052}