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/*
 * Copyright 2023-2024 wjybxx([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.wjybxx.btree;

/**
 * Task访问器,用于访问Task的内部结构。
 * 注意:访问器在访问过程中不能导致Task产生状态迁移,即不能使Task进入完成状态。
 *
 * @author wjybxx
 * date - 2024/9/4
 */
public interface TaskVisitor {

    /**
     * 访问普通子节点
     *
     * @param child 子节点
     * @param index 子节点下标
     * @param param 用户参数
     */
    void visitChild(Task child, int index, Object param);

    /**
     * 访问钩子节点(无法通过GetChild拿到的子节点,也不在ChildCount计数中)
     * 理论上钩子还可能是List或Map,但我们这个访问者只是为了做一些简单的遍历工作,并不需要如此精细的信息,
     * 因此方法参数可以未声明index/key等信息,以避免额外的开销和复杂度。
     *
     * @param child 钩子子节点
     * @param param 用户参数
     */
    void visitHook(Task child, Object param);

}




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