| 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 java.nio.ByteBuffer; |
| import java.util.Set; |
| import java.util.UUID; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.junit.Test; |
| |
| import com.google.common.collect.Sets; |
| |
| import org.apache.cassandra.db.marshal.TimeUUIDType; |
| import org.apache.cassandra.utils.UUIDGen; |
| import org.cliffc.high_scale_lib.NonBlockingHashMap; |
| |
| |
| 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 testToFromByteBuffer() |
| { |
| UUID a = UUIDGen.getTimeUUID(); |
| ByteBuffer bb = UUIDGen.toByteBuffer(a); |
| UUID b = UUIDGen.getUUID(bb); |
| 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; |
| } |
| |
| /* |
| * Don't ignore spurious failures of this test since it is testing concurrent access |
| * and might not fail reliably. |
| */ |
| @Test |
| public void verifyConcurrentUUIDGeneration() throws Throwable |
| { |
| long iterations = 250000; |
| int threads = 4; |
| ExecutorService es = Executors.newFixedThreadPool(threads); |
| try |
| { |
| AtomicBoolean failedOrdering = new AtomicBoolean(false); |
| AtomicBoolean failedDuplicate = new AtomicBoolean(false); |
| Set<UUID> generated = Sets.newSetFromMap(new NonBlockingHashMap<>()); |
| Runnable task = () -> { |
| long lastTimestamp = 0; |
| long newTimestamp = 0; |
| |
| for (long i = 0; i < iterations; i++) |
| { |
| UUID uuid = UUIDGen.getTimeUUID(); |
| newTimestamp = uuid.timestamp(); |
| |
| if (lastTimestamp >= newTimestamp) |
| failedOrdering.set(true); |
| if (!generated.add(uuid)) |
| failedDuplicate.set(true); |
| |
| lastTimestamp = newTimestamp; |
| } |
| }; |
| |
| for (int i = 0; i < threads; i++) |
| { |
| es.execute(task); |
| } |
| es.shutdown(); |
| es.awaitTermination(10, TimeUnit.MINUTES); |
| |
| assert !failedOrdering.get(); |
| assert !failedDuplicate.get(); |
| } |
| finally |
| { |
| es.shutdown(); |
| } |
| } |
| } |