using Furion.EventBus;
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using RabbitMQ.Client;
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using RabbitMQ.Client.Events;
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using System;
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using System.Text;
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using System.Text.Json;
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using System.Threading;
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using System.Threading.Channels;
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using System.Threading.Tasks;
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namespace FlexJobApi.Core
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{
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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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// 声明路由队列
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_model.QueueDeclare(routeKey, false, false, false, null);
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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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// 写入内存管道存储器
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Task.Run(async () =>
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{
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await _channel.Writer.WriteAsync(eventSource);
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});
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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(routeKey, false, 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 EventSource
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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("", _routeKey, null, 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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var eventSource = await _channel.Reader.ReadAsync(cancellationToken);
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return eventSource;
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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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}
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