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/*
* ============LICENSE_START=======================================================
* ONAP PAP
* ================================================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.pap.main.comm;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.junit.Test;
public class QueueTokenTest {
private static final String STRING1 = "a string";
private static final String STRING2 = "another string";
private QueueToken<String> token;
@Test
public void test() throws Exception {
token = new QueueToken<>(STRING1);
assertEquals(STRING1, token.get());
assertEquals(STRING1, token.replaceItem(STRING2));
assertEquals(STRING2, token.get());
assertEquals(STRING2, token.replaceItem(null));
assertEquals(null, token.get());
assertEquals(null, token.replaceItem(null));
assertEquals(null, token.get());
assertEquals(null, token.replaceItem(STRING1));
assertEquals(null, token.get());
/*
* Now do some mult-threaded tests, hopefully causing some contention.
*/
token = new QueueToken<>("");
Set<String> values = ConcurrentHashMap.newKeySet();
// create and configure the threads
Thread[] threads = new Thread[100];
for (int x = 0; x < threads.length; ++x) {
final int xfinal = x;
threads[x] = new Thread(() -> values.add(token.replaceItem("me-" + xfinal)));
threads[x].setDaemon(true);
}
// start the threads all at once
for (Thread thread : threads) {
thread.start();
}
// wait for the threads to stop
for (Thread thread : threads) {
thread.join(5000);
}
values.add(token.replaceItem(null));
for (int x = 0; x < threads.length; ++x) {
String msg = "me-" + x;
assertTrue(msg, values.contains(msg));
}
}
}
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