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107 lines
2.8 KiB
Java
107 lines
2.8 KiB
Java
/*
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* Copyright 2025 mingliqiye
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* ProjectName mingli-utils
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* ModuleName mingli-utils.main
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* CurrentFile IsChanged.java
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* LastUpdate 2025-09-09 08:37:33
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* UpdateUser MingLiPro
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*/
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package com.mingliqiye.utils.concurrent;
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import java.util.Objects;
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import java.util.concurrent.atomic.AtomicReference;
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/**
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* IsChanged 类提供了一个线程安全的包装器，用于检测值是否发生变化。
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* 它基于 AtomicReference 实现，适用于需要监控数据变更的并发场景。
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*
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* @param <T> 泛型类型，表示被包装的数据类型
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* @author MingLiPro
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*/
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public class IsChanged<T> {
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/**
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* 使用 AtomicReference 来保证对数据的原子操作
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*/
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private final AtomicReference<T> atomicReferenceData;
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/**
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* 默认构造函数，初始化数据为 null
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*/
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public IsChanged() {
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this(null);
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}
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/**
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* 带参数的构造函数，使用指定的初始值初始化
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*
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* @param data 初始数据值
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*/
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public IsChanged(T data) {
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atomicReferenceData = new AtomicReference<>(data);
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}
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/**
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* 设置新的数据值，不检查是否发生变化
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*
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* @param data 要设置的新数据值
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*/
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public void set(T data) {
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atomicReferenceData.set(data);
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}
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/**
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* 获取当前数据值
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*
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* @return 当前数据值
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*/
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public T get() {
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return atomicReferenceData.get();
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}
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/**
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* 设置新的数据值并返回旧的数据值
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*
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* @param data 要设置的新数据值
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* @return 设置前的旧数据值
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*/
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public T setAndGet(T data) {
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return atomicReferenceData.getAndSet(data);
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}
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/**
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* 设置新的数据值，如果新值与当前值不同则更新并返回 true，否则返回 false
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* 使用 CAS(Compare-And-Swap) 操作确保线程安全
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*
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* @param data 要设置的新数据值
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* @return 如果值发生变化返回 true，否则返回 false
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*/
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public boolean setAndChanged(T data) {
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T currentData;
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do {
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currentData = get();
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// 如果新值与当前值相等，则认为没有变化，直接返回 false
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if (Objects.equals(data, currentData)) {
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return false;
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}
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// 使用 CAS 操作尝试更新值，如果失败则重试
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} while (!atomicReferenceData.compareAndSet(currentData, data));
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// 成功更新值，返回 true 表示发生了变化
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return true;
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}
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}
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