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.util;
019
020import static org.junit.Assert.assertTrue;
021import static org.junit.Assert.fail;
022
023import org.apache.hadoop.hbase.HBaseClassTestRule;
024import org.apache.hadoop.hbase.testclassification.MiscTests;
025import org.apache.hadoop.hbase.testclassification.SmallTests;
026import org.junit.ClassRule;
027import org.junit.Test;
028import org.junit.experimental.categories.Category;
029
030/**
031 * Tests to make sure that the default environment edge conforms to appropriate behaviour.
032 */
033@Category({ MiscTests.class, SmallTests.class })
034public class TestDefaultEnvironmentEdge {
035
036  @ClassRule
037  public static final HBaseClassTestRule CLASS_RULE =
038    HBaseClassTestRule.forClass(TestDefaultEnvironmentEdge.class);
039
040  @Test
041  public void testGetCurrentTimeUsesSystemClock() {
042    DefaultEnvironmentEdge edge = new DefaultEnvironmentEdge();
043    long systemTime = EnvironmentEdgeManager.currentTime();
044    long edgeTime = edge.currentTime();
045    assertTrue("System time must be either the same or less than the edge time",
046      systemTime < edgeTime || systemTime == edgeTime);
047    try {
048      Thread.sleep(1);
049    } catch (InterruptedException e) {
050      fail(e.getMessage());
051    }
052    long secondEdgeTime = edge.currentTime();
053    assertTrue("Second time must be greater than the first", secondEdgeTime > edgeTime);
054  }
055}