How to use

cn.wizzer.iot.mqtt.server.common.subscribe.SubscribeStore

constructor

public void processSubscribe(Channel channel, MqttSubscribeMessage msg) {
  List<MqttTopicSubscription> topicSubscriptions = msg.payload().topicSubscriptions();
  if (this.validTopicFilter(topicSubscriptions)) {
    String clientId = (String) channel.attr(AttributeKey.valueOf("clientId")).get();
    List<Integer> mqttQoSList = new ArrayList<Integer>();
    topicSubscriptions.forEach(topicSubscription -> {
      String topicFilter = topicSubscription.topicName();
      MqttQoS mqttQoS = topicSubscription.qualityOfService();
      SubscribeStore subscribeStore = new SubscribeStore(clientId, topicFilter, mqttQoS.value());
      subscribeStoreService.put(topicFilter, subscribeStore);
      mqttQoSList.add(mqttQoS.value());
      LOGGER.debug("SUBSCRIBE - clientId: {}, topFilter: {}, QoS: {}", clientId, topicFilter, mqttQoS.value());
    });
    MqttSubAckMessage subAckMessage = (MqttSubAckMessage) MqttMessageFactory.newMessage(
      new MqttFixedHeader(MqttMessageType.SUBACK, false, MqttQoS.AT_MOST_ONCE, false, 0),
      MqttMessageIdVariableHeader.from(msg.variableHeader().messageId()),
      new MqttSubAckPayload(mqttQoSList));
    channel.writeAndFlush(subAckMessage);
    // 发布保留消息
    topicSubscriptions.forEach(topicSubscription -> {
      String topicFilter = topicSubscription.topicName();
      MqttQoS mqttQoS = topicSubscription.qualityOfService();
      this.sendRetainMessage(channel, topicFilter, mqttQoS);
    });
  } else {
    channel.close();
  }
}