package org.apache.cassandra.utils; /* * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * */ import org.apache.cassandra.db.marshal.TimeUUIDType; import org.junit.Test; import java.nio.ByteBuffer; import java.util.UUID; public class UUIDTests { @Test public void verifyType1() { UUID uuid = UUIDGen.getTimeUUID(); assert uuid.version() == 1; } @Test public void verifyOrdering1() { UUID one = UUIDGen.getTimeUUID(); UUID two = UUIDGen.getTimeUUID(); assert one.timestamp() < two.timestamp(); } @Test public void testDecomposeAndRaw() { UUID a = UUIDGen.getTimeUUID(); byte[] decomposed = UUIDGen.decompose(a); UUID b = UUIDGen.getUUID(ByteBuffer.wrap(decomposed)); assert a.equals(b); } @Test public void testTimeUUIDType() { TimeUUIDType comp = TimeUUIDType.instance; ByteBuffer first = ByteBuffer.wrap(UUIDGen.getTimeUUIDBytes()); ByteBuffer second = ByteBuffer.wrap(UUIDGen.getTimeUUIDBytes()); assert comp.compare(first, second) < 0; assert comp.compare(second, first) > 0; ByteBuffer sameAsFirst = ByteBuffer.wrap(UUIDGen.decompose(UUIDGen.getUUID(first))); assert comp.compare(first, sameAsFirst) == 0; } @Test public void testUUIDTimestamp() { long now = System.currentTimeMillis(); UUID uuid = UUIDGen.getTimeUUID(); long tstamp = UUIDGen.getAdjustedTimestamp(uuid); // I'll be damn is the uuid timestamp is more than 10ms after now assert now <= tstamp && now >= tstamp - 10 : "now = " + now + ", timestamp = " + tstamp; } }