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a java microservice project

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/**
 * Copyright (c) 2022 TruthBean(Rogar·Q)
 * Debbie is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 * http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */
package com.truthbean.debbie.concurrent;

import java.io.Serializable;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author TruthBean/Rogar·Q
 * @since 0.1.0
 * Created on 2020-08-15 10:38
 */
public class ConcurrentHashSet extends AbstractSet
        implements Set, Serializable {

    private transient final ConcurrentHashMap map;

    private static final Object PRESENT = new Object();

    public ConcurrentHashSet() {
        this.map = new ConcurrentHashMap<>();
    }

    public ConcurrentHashSet(int initialCapacity) {
        this.map = new ConcurrentHashMap<>(initialCapacity);
    }

    public ConcurrentHashSet(int initialCapacity, float loadFactor) {
        this.map = new ConcurrentHashMap<>(initialCapacity, loadFactor, 1);
    }

    public ConcurrentHashSet(int initialCapacity,
                             float loadFactor, int concurrencyLevel) {
        this.map = new ConcurrentHashMap<>(initialCapacity, loadFactor, concurrencyLevel);
    }

    @Override
    public Iterator iterator() {
        return map.keySet().iterator();
    }

    @Override
    public int size() {
        return map.size();
    }

    @Override
    public boolean add(E e) {
        return map.putIfAbsent(e, PRESENT) == null;
    }

    @Override
    public boolean contains(Object o) {
        return map.containsKey(o);
    }

    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    @Override
    public boolean remove(Object o) {
        return map.remove(o) == null;
    }

    @Override
    public void clear() {
        map.clear();
    }
}