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socket框架，方便快速开发socket服务端和客户端

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package com.joe.easysocket.server.common.spi;

import lombok.Data;

/**
 * POJO that abstracts a change to a path
 *
 * @author joe
 */
@Data
public class NodeEvent {
    private final Type      type;
    private final ChildData data;

    /**
     * Type of change
     */
    public enum Type {
                      /**
                       * A child was added to the path
                       */
                      NODE_ADDED,

                      /**
                       * A child's data was changed
                       */
                      NODE_UPDATED,

                      /**
                       * A child was removed from the path
                       */
                      NODE_REMOVED,
    }

    /**
     * @param type event type
     * @param data event data or null
     */
    public NodeEvent(NodeEvent.Type type, ChildData data) {
        this.type = type;
        this.data = data;
    }
}