com.iohao.game.common.kit.collect.SetMultiMap Maven / Gradle / Ivy

Go to download
/*
 * ioGame
 * Copyright (C) 2021 - present  渔民小镇 （[email protected]、[email protected]） . All Rights Reserved.
 * # iohao.com . 渔民小镇
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */
package com.iohao.game.common.kit.collect;

import java.util.Map;
import java.util.Set;
import java.util.function.Consumer;

/**
 * 线程安全的 SetMultiMap
 *  *     value 为 set 集合实现
 * 
 *
 * @author 渔民小镇
 * @date 2023-12-07
 */
public interface SetMultiMap extends MultiMap {
    @Override
    Map> asMap();

    /**
     * 根据 key 来 get 一个元素，如果不存在就创建集合
     *      *     get 的元素集合一定不为 null，如果不存在就新创建。
     *
     *     首次创建该 key 的集合时，会调用 consumer 并将新创建集合传入 consumer 中。
     *
     *     开发者有需要初始化的内容，可以通过 consumer 来实现
     * 
     *
     * @param key      key
     * @param consumer consumer
     * @return 集合
     */
    Set ofIfAbsent(K key, Consumer> consumer);

    @Override
    default Set of(K key) {
        return this.ofIfAbsent(key, null);
    }

    @Override
    default Set get(K key) {
        return asMap().get(key);
    }

    Set>> entrySet();

    /**
     * 默认实现，每次 new 一个
     *
     * @param  k
     * @param  v
     * @return SetMultiMap
     */
    static  SetMultiMap create() {
        return new NonBlockingSetMultiMap<>();
    }
}