1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.lang3.concurrent;
18
19 import static org.junit.jupiter.api.Assertions.assertNull;
20
21 import java.util.concurrent.atomic.AtomicBoolean;
22
23 import org.junit.jupiter.api.Test;
24
25 /**
26 * Test class for {@code AtomicInitializer}.
27 */
28 public class AtomicInitializerTest extends AbstractConcurrentInitializerTest {
29 /**
30 * Returns the initializer to be tested.
31 *
32 * @return the {@code AtomicInitializer}
33 */
34 @Override
35 protected ConcurrentInitializer<Object> createInitializer() {
36 return new AtomicInitializer<Object>() {
37 @Override
38 protected Object initialize() {
39 return new Object();
40 }
41 };
42 }
43
44 @Test
45 public void testGetThatReturnsNullFirstTime() throws ConcurrentException {
46 final AtomicInitializer<Object> initializer = new AtomicInitializer<Object>() {
47 final AtomicBoolean firstRun = new AtomicBoolean(true);
48
49 @Override
50 protected Object initialize() {
51 if (firstRun.getAndSet(false)) {
52 return null;
53 } else {
54 return new Object();
55 }
56 }
57 };
58
59 assertNull(initializer.get());
60 assertNull(initializer.get());
61 }
62 }