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/*
* 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.
*/
package org.apache.commons.lang3.concurrent;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
/**
* Test class for {@code AtomicSafeInitializer} which also serves as a simple example.
*/
public class AtomicSafeInitializerTest extends AbstractConcurrentInitializerTest {
/** The instance to be tested. */
private AtomicSafeInitializerTestImpl initializer;
@BeforeEach
public void setUp() {
initializer = new AtomicSafeInitializerTestImpl();
}
/**
* Returns the initializer to be tested.
*
* @return the {@code AtomicSafeInitializer} under test
*/
@Override
protected ConcurrentInitializer<Object> createInitializer() {
return initializer;
}
/**
* Tests that initialize() is called only once.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException because {@link #testGetConcurrent()} may throw it
* @throws InterruptedException because {@link #testGetConcurrent()} may throw it
*/
@Test
public void testNumberOfInitializeInvocations() throws ConcurrentException, InterruptedException {
testGetConcurrent();
assertEquals(1, initializer.initCounter.get(), "Wrong number of invocations");
}
/**
* A concrete test implementation of {@code AtomicSafeInitializer} which also serves as a simple example.
* <p>
* This implementation also counts the number of invocations of the initialize() method.
* </p>
*/
private static class AtomicSafeInitializerTestImpl extends AtomicSafeInitializer<Object> {
/** A counter for initialize() invocations. */
final AtomicInteger initCounter = new AtomicInteger();
@Override
protected Object initialize() {
initCounter.incrementAndGet();
return new Object();
}
}
}
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