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