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Java example source code file (

This example Java source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractconcurrentinitializertest, atomicinteger, atomicsafeinitializertestimpl, before, concurrentexception, concurrentinitializer, interruptedexception, object, override, wrong

The Java example source code

 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.lang3.concurrent;

import static org.junit.Assert.assertEquals;

import java.util.concurrent.atomic.AtomicInteger;

import org.junit.Before;
import org.junit.Test;

 * Test class for {@code AtomicSafeInitializer}.
public class AtomicSafeInitializerTest extends
        AbstractConcurrentInitializerTest {
    /** The instance to be tested. */
    private AtomicSafeInitializerTestImpl initializer;

    public void setUp() throws Exception {
        initializer = new AtomicSafeInitializerTestImpl();

     * Returns the initializer to be tested.
     * @return the {@code AtomicSafeInitializer} under test
    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 java.lang.InterruptedException because {@link #testGetConcurrent()} may throw it
    public void testNumberOfInitializeInvocations() throws ConcurrentException,
            InterruptedException {
        assertEquals("Wrong number of invocations", 1,

     * A concrete test implementation of {@code AtomicSafeInitializer}. This
     * implementation also counts the number of invocations of the initialize()
     * method.
    private static class AtomicSafeInitializerTestImpl extends
            AtomicSafeInitializer<Object> {
        /** A counter for initialize() invocations. */
        final AtomicInteger initCounter = new AtomicInteger();

        protected Object initialize() throws ConcurrentException {
            return new Object();

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