CatchTheLettersBackend/src/main/java/com/example/catchTheLetters/utils/ObjectPool.java

package com.example.catchTheLetters.utils;

import org.jetbrains.annotations.NotNull;

import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.function.Consumer;
import java.util.function.Supplier;

/**
 * 对象池（防止频繁创建对象触发GC，必须继承）
 * @param <T> 对象类型
 * @author spyn
 */
public class ObjectPool<T> implements Iterable<T> {
    /**
     * 对象池
     */
    private final ConcurrentLinkedDeque<T> pool;

    /**
     * 创建对象委托
     */
    private final Supplier<T> factory;

    /**
     * 重置对象委托
     */
    private final Consumer<T> reset;

    /**
     * 构造函数
     * @param factory 创建对象委托
     * @param reset 重置对象委托
     */
    public ObjectPool(Supplier<T> factory, Consumer<T> reset) {
        this.pool = new ConcurrentLinkedDeque<>();
        this.factory = factory;
        this.reset = reset;
    }

    /**
     * 取出一个对象
     * @return 对象
     */
    public T borrowObject() {
        T object;
        if ((object = pool.pollFirst()) == null) {
            object = (T) factory.get();
        }
        return object;
    }

    /**
     * 存入一个对象
     * @param object 对象
     */
    public void returnObject(T object) {
        if (object == null) {
            return;
        }
        reset.accept(object);
        this.pool.push(object);
    }

    /**
     * 清空对象池
     */
    public void clear() {
        this.pool.clear();
    }

    /**
     * 覆写迭代器，便于遍历对象池
     */
    @NotNull
    @Override
    public java.util.Iterator<T> iterator() {
        return this.pool.iterator();
    }

    @Override
    public String toString() {
        return this.pool.toString();
    }
}