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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.
*/
package org.elasticsearch.common;
import org.elasticsearch.test.ESTestCase;
import java.util.HashSet;
import java.util.Set;
public class UUIDTests extends ESTestCase {
static UUIDGenerator timeUUIDGen = new TimeBasedUUIDGenerator();
static UUIDGenerator randomUUIDGen = new RandomBasedUUIDGenerator();
public void testRandomUUID() {
verifyUUIDSet(100000, randomUUIDGen);
}
public void testTimeUUID() {
verifyUUIDSet(100000, timeUUIDGen);
}
public void testThreadedTimeUUID() {
testUUIDThreaded(timeUUIDGen);
}
public void testThreadedRandomUUID() {
testUUIDThreaded(randomUUIDGen);
}
Set<String> verifyUUIDSet(int count, UUIDGenerator uuidSource) {
HashSet<String> uuidSet = new HashSet<>();
for (int i = 0; i < count; ++i) {
uuidSet.add(uuidSource.getBase64UUID());
}
assertEquals(count, uuidSet.size());
return uuidSet;
}
class UUIDGenRunner implements Runnable {
int count;
public Set<String> uuidSet = null;
UUIDGenerator uuidSource;
UUIDGenRunner(int count, UUIDGenerator uuidSource) {
this.count = count;
this.uuidSource = uuidSource;
}
@Override
public void run() {
uuidSet = verifyUUIDSet(count, uuidSource);
}
}
public void testUUIDThreaded(UUIDGenerator uuidSource) {
HashSet<UUIDGenRunner> runners = new HashSet<>();
HashSet<Thread> threads = new HashSet<>();
int count = 20;
int uuids = 10000;
for (int i = 0; i < count; ++i) {
UUIDGenRunner runner = new UUIDGenRunner(uuids, uuidSource);
Thread t = new Thread(runner);
threads.add(t);
runners.add(runner);
}
for (Thread t : threads) {
t.start();
}
boolean retry = false;
do {
for (Thread t : threads) {
try {
t.join();
} catch (InterruptedException ie) {
retry = true;
}
}
} while (retry);
HashSet<String> globalSet = new HashSet<>();
for (UUIDGenRunner runner : runners) {
globalSet.addAll(runner.uuidSet);
}
assertEquals(count*uuids, globalSet.size());
}
}