添加项目文件。
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using JNPF.Common.Security;
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using JNPF.EventBus;
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using JNPF.Logging;
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using RabbitMQ.Client;
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using RabbitMQ.Client.Events;
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using System.Text;
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using System.Text.Json;
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using System.Threading.Channels;
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namespace JNPF.EventHandler;
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/// <summary>
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/// RabbitMQ 事件存储器.
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/// </summary>
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public sealed class RabbitMQEventSourceStorer : IEventSourceStorer, IDisposable
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{
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/// <summary>
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/// 内存通道事件源存储器.
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/// </summary>
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private readonly Channel<IEventSource> _channel;
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/// <summary>
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/// 通道对象.
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/// </summary>
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private readonly IModel _model;
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/// <summary>
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/// 连接对象.
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/// </summary>
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private readonly IConnection _connection;
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/// <summary>
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/// 路由键.
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/// </summary>
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private readonly string _routeKey;
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/// <summary>
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/// 构造函数.
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/// </summary>
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/// <param name="factory">连接工厂.</param>
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/// <param name="routeKey">路由键.</param>
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/// <param name="capacity">存储器最多能够处理多少消息,超过该容量进入等待写入.</param>
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public RabbitMQEventSourceStorer(ConnectionFactory factory, string routeKey, int capacity)
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{
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// 配置通道,设置超出默认容量后进入等待
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var boundedChannelOptions = new BoundedChannelOptions(capacity)
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{
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FullMode = BoundedChannelFullMode.Wait
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};
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// 创建有限容量通道
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_channel = Channel.CreateBounded<IEventSource>(boundedChannelOptions);
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// 创建连接
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_connection = factory.CreateConnection();
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_routeKey = routeKey;
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// 创建通道
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_model = _connection.CreateModel();
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string ExchangeName = "MXK_IDENTITY_MAIN_TOPIC";
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/*
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* 声明路由队列
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* 队列可以重复声明,但是声明所使用的参数必须一致,否则会抛出异常
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* queue:队列名称
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* durable:持久化
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* exclusive:排他队列,如果一个队列被声明为排他队列,该队列仅对首次声明它的连接可见,
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* 并在连接断开时自动删除。这里需要注意三点:其一,排他队列是基于连接可见的,同一连接的不同信道是可
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* 以同时访问同一个连接创建的排他队列的。其二,“首次”,如果一个连接已经声明了一个排他队列,其他连
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* 接是不允许建立同名的排他队列的,这个与普通队列不同。其三,即使该队列是持久化的,一旦连接关闭或者
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* 客户端退出,该排他队列都会被自动删除的。这种队列适用于只限于一个客户端发送读取消息的应用场景。
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* autoDelete:自动删除
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* arguments:参数
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*/
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_model.QueueDeclare(queue: routeKey, durable: false, exclusive: false, autoDelete: false, arguments: null);
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// 将MaxKey 交换机绑定到 路由中
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_model.QueueBind(queue: routeKey, exchange: ExchangeName, routingKey: "#");
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// 字节限制,一次接收的消息数,全局/
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// 据说prefetchSize 和global这两项,rabbitmq没有实现,暂且不研究
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_model.BasicQos(prefetchSize: 0, prefetchCount: 1, false);
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// 创建消息订阅者
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var consumer = new EventingBasicConsumer(_model);
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// 订阅消息并写入内存 Channel
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consumer.Received += (ch, ea) =>
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{
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// 读取原始消息
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var stringEventSource = Encoding.UTF8.GetString(ea.Body.ToArray());
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// 转换为 IEventSource,这里可以选择自己喜欢的序列化工具,如果自定义了 EventSource,注意属性是可读可写
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var eventSource = JsonSerializer.Deserialize<ChannelEventSource>(stringEventSource);
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Log.Information($"- 接收到消息:{eventSource.ToJsonString()}");
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// 写入内存管道存储器
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_channel.Writer.TryWrite(eventSource);
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// 确认该消息已被消费
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_model.BasicAck(ea.DeliveryTag, false);
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};
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// 启动消费者 设置为手动应答消息
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_model.BasicConsume(queue: routeKey, autoAck: true, consumer: consumer);
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}
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/// <summary>
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/// 将事件源写入存储器.
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/// </summary>
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/// <param name="eventSource">事件源对象.</param>
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/// <param name="cancellationToken">取消任务 Token.</param>
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/// <returns><see cref="ValueTask"/></returns>
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public async ValueTask WriteAsync(IEventSource eventSource, CancellationToken cancellationToken)
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{
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// 空检查
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if (eventSource == default)
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{
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throw new ArgumentNullException(nameof(eventSource));
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}
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// 这里判断是否是 ChannelEventSource 或者 自定义的 EventSouce
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if (eventSource is ChannelEventSource source)
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{
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// 序列化,这里可以选择自己喜欢的序列化工具
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var data = Encoding.UTF8.GetBytes(JsonSerializer.Serialize(source));
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// 发布
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_model.BasicPublish(string.Empty, _routeKey, basicProperties: null, body: data);
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}
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else
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{
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// 这里处理动态订阅问题
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await _channel.Writer.WriteAsync(eventSource, cancellationToken);
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}
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}
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/// <summary>
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/// 从存储器中读取一条事件源.
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/// </summary>
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/// <param name="cancellationToken">取消任务 Token.</param>
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/// <returns>事件源对象.</returns>
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public async ValueTask<IEventSource> ReadAsync(CancellationToken cancellationToken)
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{
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// 读取一条事件源
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return await _channel.Reader.ReadAsync(cancellationToken);
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}
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/// <summary>
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/// 释放非托管资源.
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/// </summary>
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public void Dispose()
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{
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_model.Dispose();
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_connection.Dispose();
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}
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}
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