/* Licensed 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.camunda.bpm.engine.test.concurrency;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentSkipListSet;
import org.junit.Assert;
import org.junit.Test;
import com.fasterxml.uuid.EthernetAddress;
import com.fasterxml.uuid.Generators;
import com.fasterxml.uuid.impl.TimeBasedGenerator;
/**
* @author Daniel Meyer
*
*/
public class UuidGeneratorTest {
private static final int THREAD_COUNT = 10;
private static final int LOOP_COUNT = 10000;
@Test
public void testMultithreaded() throws InterruptedException {
final List<Thread> threads = new ArrayList<Thread>();
final TimeBasedGenerator timeBasedGenerator = Generators.timeBasedGenerator(EthernetAddress.fromInterface());
final ConcurrentSkipListSet<String> generatedIds = new ConcurrentSkipListSet<String>();
final ConcurrentSkipListSet<String> duplicatedIds = new ConcurrentSkipListSet<String>();
for (int i = 0; i < THREAD_COUNT; i++) {
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
for (int j = 0; j < LOOP_COUNT; j++) {
String id = timeBasedGenerator.generate().toString();
boolean wasAdded = generatedIds.add(id);
if (!wasAdded) {
duplicatedIds.add(id);
}
}
}
});
threads.add(thread);
thread.start();
}
for (Thread thread : threads) {
thread.join();
}
Assert.assertEquals(THREAD_COUNT * LOOP_COUNT, generatedIds.size());
Assert.assertTrue(duplicatedIds.isEmpty());
}
}