com.feingto.iot.common.model.mqtt.SendMessage Maven / Gradle / Ivy

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package com.feingto.iot.common.model.mqtt;

import com.feingto.iot.common.util.ParserKit;
import io.netty.handler.codec.mqtt.MqttMessageType;
import io.netty.handler.codec.mqtt.MqttPublishMessage;
import io.netty.handler.codec.mqtt.MqttQoS;
import lombok.Data;
import lombok.experimental.Accessors;

import java.io.Serializable;

/**
 * Mqtt 消息
 *
 * @author longfei
 */
@Data
@Accessors(fluent = true)
public class SendMessage implements Serializable {
    private static final long serialVersionUID = 3934400295613105846L;

    /**
     * 消息ID
     */
    private Integer id;

    /**
     * 主题名称
     */
    private String topic;

    /**
     * 是否第一次发送
     * false: 表示当前为第一次发送
     */
    private boolean dup;

    /**
     * QoS level
     * 0: 发布到所有订阅者，不响应
     * 1: 持久化，发布到所有订阅者，返回PUBACK
     * 2: 持久化，不发布，返回PUBREC，需要彼此确认
     * QoS level = 2 消息保障的网络I/O次数过多，如非必需，尽量少用
     */
    private MqttQoS mqttQoS;

    /**
     * 是否持久化
     * false: 仅仅为当前订阅者推送此消息; 1: 一直持久保存
     */
    private boolean retain;

    /**
     * 消息内容
     */
    private byte[] payload;

    /**
     * 消息类型
     */
    private MqttMessageType type;

    public static SendMessage newInstance(MqttPublishMessage msg) {
        return new SendMessage()
                .id(msg.variableHeader().packetId())
                .topic(msg.variableHeader().topicName())
                .dup(false)
                .mqttQoS(msg.fixedHeader().qosLevel())
                .retain(msg.fixedHeader().isRetain())
                .payload(ParserKit.copyByteBuf(msg.payload()));
    }
}