DigitalFactory/Admin.NET/Admin.NET.Core/EventBus/RedisEventSourceStorer.cs

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2024-03-18 01:36:19 +00:00
// 大名科技(天津)有限公司版权所有 电话18020030720 QQ515096995
//
// 此源代码遵循位于源代码树根目录中的 LICENSE 文件的许可证
using System.Threading.Channels;
namespace Admin.NET.Core;
/// <summary>
/// Redis自定义事件源存储器
/// </summary>
public sealed class RedisEventSourceStorer : IEventSourceStorer, IDisposable
{
/// <summary>
/// 消费者
/// </summary>
private readonly EventConsumer<ChannelEventSource> _eventConsumer;
/// <summary>
/// 内存通道事件源存储器
/// </summary>
private readonly Channel<IEventSource> _channel;
/// <summary>
/// Redis 连接对象
/// </summary>
private readonly FullRedis _redis;
/// <summary>
/// 路由键
/// </summary>
private readonly string _routeKey;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="redis">Redis 连接对象</param>
/// <param name="routeKey">路由键</param>
/// <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>
public RedisEventSourceStorer(ICache redis, string routeKey, int capacity)
{
// 配置通道,设置超出默认容量后进入等待
var boundedChannelOptions = new BoundedChannelOptions(capacity)
{
FullMode = BoundedChannelFullMode.Wait
};
// 创建有限容量通道
_channel = Channel.CreateBounded<IEventSource>(boundedChannelOptions);
_redis = redis as FullRedis;
_routeKey = routeKey;
// 创建消息订阅者
_eventConsumer = new EventConsumer<ChannelEventSource>(_redis, _routeKey);
// 订阅消息写入 Channel
_eventConsumer.Received += (send, cr) =>
{
// 反序列化消息
//var eventSource = JsonConvert.DeserializeObject<ChannelEventSource>(cr);
// 写入内存管道存储器
_channel.Writer.WriteAsync(cr);
};
// 启动消费者
_eventConsumer.Start();
}
/// <summary>
/// 将事件源写入存储器
/// </summary>
/// <param name="eventSource">事件源对象</param>
/// <param name="cancellationToken">取消任务 Token</param>
/// <returns><see cref="ValueTask"/></returns>
public async ValueTask WriteAsync(IEventSource eventSource, CancellationToken cancellationToken)
{
// 空检查
if (eventSource == default)
{
throw new ArgumentNullException(nameof(eventSource));
}
// 这里判断是否是 ChannelEventSource 或者 自定义的 EventSource
if (eventSource is ChannelEventSource source)
{
// 序列化消息
//var data = JsonSerializer.Serialize(source);
// 获取一个订阅对象
var queue = _redis.GetQueue<ChannelEventSource>(_routeKey);
// 异步发布
await Task.Factory.StartNew(() =>
{
queue.Add(source);
}, cancellationToken, TaskCreationOptions.LongRunning, System.Threading.Tasks.TaskScheduler.Default);
}
else
{
// 这里处理动态订阅问题
await _channel.Writer.WriteAsync(eventSource, cancellationToken);
}
}
/// <summary>
/// 从存储器中读取一条事件源
/// </summary>
/// <param name="cancellationToken">取消任务 Token</param>
/// <returns>事件源对象</returns>
public async ValueTask<IEventSource> ReadAsync(CancellationToken cancellationToken)
{
// 读取一条事件源
var eventSource = await _channel.Reader.ReadAsync(cancellationToken);
return eventSource;
}
/// <summary>
/// 释放非托管资源
/// </summary>
public async void Dispose()
{
await _eventConsumer.Stop();
GC.SuppressFinalize(this);
}
}