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完成 单例模式 单元测试
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‎singleton/src/test/java/me/zbl/singleton/DirectorTest.java‎

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/**
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* MIT License
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* <p>
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* Copyright (c) 2017 James
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package me.zbl.singleton;
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/**
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* 测试普通单例模式
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*/
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public class DirectorTest extends SingletonTest<Director> {
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/**
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* 创建一个测试用例
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*/
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public DirectorTest() {
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super(Director::getInstance);
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}
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}

‎singleton/src/test/java/me/zbl/singleton/EnumDirectorTest.java‎

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/**
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* MIT License
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* <p>
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* Copyright (c) 2017 James
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package me.zbl.singleton;
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/**
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* 测试枚举类型单例模式
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*/
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public class EnumDirectorTest extends SingletonTest<EnumDirector> {
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/**
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* 创建一个测试用例
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*/
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public EnumDirectorTest() {
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super(() -> EnumDirector.INSTANCE);
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}
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}

‎singleton/src/test/java/me/zbl/singleton/LazyInitializationDirectorTest.java‎

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/**
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* MIT License
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* <p>
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* Copyright (c) 2017 James
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package me.zbl.singleton;
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/**
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* 测试懒加载型单例模式
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*/
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public class LazyInitializationDirectorTest extends SingletonTest<LazyInitializationDirector> {
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/**
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* 创建一个测试用例
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*/
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public LazyInitializationDirectorTest() {
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super(LazyInitializationDirector::getInstance);
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}
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}

‎singleton/src/test/java/me/zbl/singleton/SingletonTest.java‎

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/**
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* MIT License
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* <p>
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* Copyright (c) 2017 James
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package me.zbl.singleton;
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import org.junit.Test;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.*;
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import java.util.function.Supplier;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertSame;
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/**
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* 测试单例模式
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* <p>
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* 提供测试单例结构的测试用例
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* <p>
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* 第一个验证，在同一个线程中，对 getInstance() 的多次调用结果是相同的
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* 第二个验证，在不同的线程中，对 getInstance() 的多次调用结果也是一样的
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*/
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public abstract class SingletonTest<S> {
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/**
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* 获取单例实例的方法
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*/
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private final Supplier<S> singletonInstanceMethod;
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/**
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* 创建一个测试用例
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*
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* @param singletonInstanceMethod 实例类中获取实例的方法
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*/
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public SingletonTest(final Supplier<S> singletonInstanceMethod) {
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this.singletonInstanceMethod = singletonInstanceMethod;
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}
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/**
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* 测试在同一线程中的多次调用返回结果是相同的
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*/
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@Test
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public void testMultipleCallsReturnSameObjectInSameThread() {
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// 在同一线程中创建多个实例
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S instance1 = singletonInstanceMethod.get();
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S instance2 = singletonInstanceMethod.get();
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S instance3 = singletonInstanceMethod.get();
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// 分别验证是否相同
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assertSame(instance1, instance2);
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assertSame(instance2, instance3);
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assertSame(instance3, instance1);
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}
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/**
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* 测试在不同线程中的多次调用返回的结果也是相同的
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*/
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@Test(timeout = 5000L)
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public void testMultipleCallsReturnSameObjectInMultipleThread() throws InterruptedException, ExecutionException {
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// 创建 5000 个任务，并在每个任务中实例化单例类
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List<Callable<S>> tasks = new ArrayList<>();
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for (int i = 0; i < 5000; i++) {
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tasks.add(singletonInstanceMethod::get);
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}
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// 使用 10 个不同的线程来分别执行这 5000 个任务
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final ExecutorService pool = Executors.newFixedThreadPool(10);
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final List<Future<S>> results = pool.invokeAll(tasks);
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// 预期结果
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S expectedResult = singletonInstanceMethod.get();
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// 分别验证是否是同一个对象
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for (Future<S> res : results) {
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final S result = res.get();
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assertNotNull(result);
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assertSame(expectedResult, result);
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}
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}
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}

‎singleton/src/test/java/me/zbl/singleton/ThreadSafeDoubleCheckLockingTest.java‎

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/**
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* MIT License
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* <p>
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* Copyright (c) 2017 James
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10+
* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package me.zbl.singleton;
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/**
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* 测试线程安全的双检锁单例模式
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*/
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public class ThreadSafeDoubleCheckLockingTest extends SingletonTest<ThreadSafeDoubleCheckLocking> {
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/**
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* 创建一个测试用例
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*/
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public ThreadSafeDoubleCheckLockingTest() {
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super(ThreadSafeDoubleCheckLocking::getInstance);
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}
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}

‎singleton/src/test/java/me/zbl/singleton/ThreadSafeLazyLoadDirectorTest.java‎

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/**
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* MIT License
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* <p>
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* Copyright (c) 2017 James
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
7+
* of this software and associated documentation files (the "Software"), to deal
8+
* in the Software without restriction, including without limitation the rights
9+
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10+
* copies of the Software, and to permit persons to whom the Software is
11+
* furnished to do so, subject to the following conditions:
12+
* <p>
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* The above copyright notice and this permission notice shall be included in all
14+
* copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package me.zbl.singleton;
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/**
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* 测试线程安全型的懒加载单例模式
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*/
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public class ThreadSafeLazyLoadDirectorTest extends SingletonTest<ThreadSafeLazyLoadDirector> {
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/**
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* 创建一个测试用例
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*/
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public ThreadSafeLazyLoadDirectorTest() {
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super(ThreadSafeLazyLoadDirector::getInstance);
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}
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}

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