MQTTnet.Agent 1.0.4

MQTTnet.Agent MQTT 消息代理

概述

目标

1. 建立类型化 订阅/发布接口
2. 通过 Pub/Sub 接口 简化 MQTTnet Client 消息订阅和发布方法

接口定义

消息订阅接口

• IMessageReader
  • 接口返回 ChannelReader<T> 方便异步处理消息

/// <summary>
/// MQTT 消息读取 Channel
/// </summary>
public interface IMessageReader {
    /// <summary>
    /// 订阅消息
    /// </summary>
    /// <typeparam name="T">消息类型</typeparam>
    /// <param name="topic">订阅主题</param>
    /// <param name="cancellationToken"></param>
    Task<ChannelReader<MessageArgs<T>>> GetChannelAsync<T>(string topic, CancellationToken cancellationToken = default) where T : class;
}

• IMessageSubscriber
  • Reactive 风格的订阅接口

/// <summary>
/// 消息订阅器
/// </summary>
public interface IMessageSubscriber : IDisposable {

    /// <summary>
    /// 订阅主题
    /// </summary>
    /// <typeparam name="T"></typeparam>
    Task<IObservable<MessageArgs<T>>> SubscribeAsync<T>(string topic, CancellationToken cancellationToken = default) where T : class;

    /// <summary>
    /// 包含处理程序的主题订阅
    /// </summary>
    /// <typeparam name="T">订阅消息类型</typeparam>
    Task<IDisposable> SubscribeAsync<T>(string topic, Action<MessageArgs<T>> onNext, CancellationToken cancellationToken = default) where T : class;
}

• 发布接口

public interface IMessagePublisher {
    /// <summary>
    /// 发布消息
    /// </summary>
    /// <param name="topic">发布主题</param>
    /// <param name="payload">载荷对象</param>
    /// <param name="retain">消息保留标志,默认为 <see langword="false"/></param>
    /// <param name="options"></param>
    /// <param name="cancellationToken"></param>
    /// <typeparam name="T"></typeparam>
    /// <returns></returns>
    Task PublishAsync<T>(string topic, T? payload, JsonSerializerOptions? options = null, bool retain = false, CancellationToken cancellationToken = default(CancellationToken)) where T : class;

    /// <summary>
    /// 发布文本消息
    /// </summary>
    /// <param name="topic">发布主题</param>
    /// <param name="payload">载荷内容</param>
    /// <param name="retain">消息保留标志,默认为 <see langword="false"/></param>
    /// <param name="cancellationToken"></param>
    /// <returns></returns>
    Task PublishStringAsync(string topic, string payload, bool retain = false, CancellationToken cancellationToken = default(CancellationToken));
}

• 合并接口

public interface IMessageAgent : IMessageReader, IMessagePublisher, IDisposable {

}

public interface IMessageHub : IMessageSubscriber, IMessagePublisher {

}