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/// <summary>\r\n    /// \u5185\u5b58\u901a\u9053\u4e8b\u4ef6\u6e90\u5b58\u50a8\u5668\r\n    /// </summary>\r\n    private readonly Channel<IEventSource> _channel;\r\n\r\n    /// <summary>\r\n    /// Redis \u8fde\u63a5\u5bf9\u8c61\r\n    /// </summary>\r\n    private readonly ConnectionMultiplexer _connectionMultiplexer;\r\n\r\n    /// <summary>\r\n    /// \u8def\u7531\u952e\r\n    /// </summary>\r\n    private readonly string _routeKey;\r\n\r\n    /// <summary>\r\n    /// \u6784\u9020\u51fd\u6570\r\n    /// </summary>\r\n    /// <param name="connectionMultiplexer">Redis \u8fde\u63a5\u5bf9\u8c61</param>\r\n    /// <param name="routeKey">\u8def\u7531\u952e</param>\r\n    /// <param name="capacity">\u5b58\u50a8\u5668\u6700\u591a\u80fd\u591f\u5904\u7406\u591a\u5c11\u6d88\u606f\uff0c\u8d85\u8fc7\u8be5\u5bb9\u91cf\u8fdb\u5165\u7b49\u5f85\u5199\u5165</param>\r\n    public RedisEventSourceStorer(ConnectionMultiplexer connectionMultiplexer, string routeKey, int capacity)\r\n    {\r\n        // \u914d\u7f6e\u901a\u9053\uff0c\u8bbe\u7f6e\u8d85\u51fa\u9ed8\u8ba4\u5bb9\u91cf\u540e\u8fdb\u5165\u7b49\u5f85\r\n        var boundedChannelOptions = new BoundedChannelOptions(capacity)\r\n        {\r\n            FullMode = BoundedChannelFullMode.Wait\r\n        };\r\n\r\n        // \u521b\u5efa\u6709\u9650\u5bb9\u91cf\u901a\u9053\r\n        _channel = Channel.CreateBounded<IEventSource>(boundedChannelOptions);\r\n\r\n        _connectionMultiplexer = connectionMultiplexer;\r\n        _routeKey = routeKey;\r\n\r\n        // \u83b7\u53d6\u4e00\u4e2a\u8ba2\u9605\u5bf9\u8c61\r\n        var subscriber = connectionMultiplexer.GetSubscriber();\r\n\r\n        // \u8ba2\u9605\u6d88\u606f\r\n        subscriber.Subscribe(routeKey, (channel, data) =>\r\n        {\r\n            // \u8f6c\u6362\u4e3a IEventSource\uff0c\u8fd9\u91cc\u53ef\u4ee5\u9009\u62e9\u81ea\u5df1\u559c\u6b22\u7684\u5e8f\u5217\u5316\u5de5\u5177\uff0c\u5982\u679c\u81ea\u5b9a\u4e49\u4e86 EventSource\uff0c\u6ce8\u610f\u5c5e\u6027\u662f\u53ef\u8bfb\u53ef\u5199\r\n            var eventSource = JsonSerializer.Deserialize<ChannelEventSource>(data.ToString());\r\n\r\n            // \u5199\u5165\u5185\u5b58\u7ba1\u9053\u5b58\u50a8\u5668\r\n            _channel.Writer.WriteAsync(eventSource);\r\n        });\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u5c06\u4e8b\u4ef6\u6e90\u5199\u5165\u5b58\u50a8\u5668\r\n    /// </summary>\r\n    /// <param name="eventSource">\u4e8b\u4ef6\u6e90\u5bf9\u8c61</param>\r\n    /// <param name="cancellationToken">\u53d6\u6d88\u4efb\u52a1 Token</param>\r\n    /// <returns><see cref="ValueTask"/></returns>\r\n    public async ValueTask WriteAsync(IEventSource eventSource, CancellationToken cancellationToken)\r\n    {\r\n        // \u7a7a\u68c0\u67e5\r\n        if (eventSource == default)\r\n        {\r\n            throw new ArgumentNullException(nameof(eventSource));\r\n        }\r\n\r\n        // \u8fd9\u91cc\u5224\u65ad\u662f\u5426\u662f ChannelEventSource \u6216\u8005 \u81ea\u5b9a\u4e49\u7684 EventSource\r\n        if (eventSource is ChannelEventSource source)\r\n        {\r\n            // \u5e8f\u5217\u5316\uff0c\u8fd9\u91cc\u53ef\u4ee5\u9009\u62e9\u81ea\u5df1\u559c\u6b22\u7684\u5e8f\u5217\u5316\u5de5\u5177\r\n            var data = JsonSerializer.Serialize(source);\r\n\r\n            // \u83b7\u53d6\u4e00\u4e2a\u8ba2\u9605\u5bf9\u8c61\r\n            var subscriber = _connectionMultiplexer.GetSubscriber();\r\n            await subscriber.PublishAsync(_routeKey, data);\r\n        }\r\n        else\r\n        {\r\n            // \u8fd9\u91cc\u5904\u7406\u52a8\u6001\u8ba2\u9605\u95ee\u9898\r\n            await _channel.Writer.WriteAsync(eventSource, cancellationToken);\r\n        }\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u4ece\u5b58\u50a8\u5668\u4e2d\u8bfb\u53d6\u4e00\u6761\u4e8b\u4ef6\u6e90\r\n    /// </summary>\r\n    /// <param name="cancellationToken">\u53d6\u6d88\u4efb\u52a1 Token</param>\r\n    /// <returns>\u4e8b\u4ef6\u6e90\u5bf9\u8c61</returns>\r\n    public async ValueTask<IEventSource> ReadAsync(CancellationToken cancellationToken)\r\n    {\r\n        // \u8bfb\u53d6\u4e00\u6761\u4e8b\u4ef6\u6e90\r\n        var eventSource = await _channel.Reader.ReadAsync(cancellationToken);\r\n        return eventSource;\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u91ca\u653e\u975e\u6258\u7ba1\u8d44\u6e90\r\n    /// </summary>\r\n    public void Dispose()\r\n    {\r\n        _connectionMultiplexer.Dispose();\r\n    }\r\n}\n'})}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsx)(n.strong,{children:"3. \u66ff\u6362\u9ed8\u8ba4\u4e8b\u4ef6\u5b58\u50a8\u5668"})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {1,4,7,10-13}",children:'services.AddEventBus(options =>\r\n{\r\n    // \u521b\u5efa Redis \u8fde\u63a5\u5bf9\u8c61\r\n    var connectionMultiplexer = ConnectionMultiplexer.Connect("localhost");\r\n\r\n    // \u521b\u5efa\u9ed8\u8ba4\u5185\u5b58\u901a\u9053\u4e8b\u4ef6\u6e90\u5bf9\u8c61\uff0c\u53ef\u81ea\u5b9a\u4e49\u961f\u5217\u8def\u7531key\uff0c\u6bd4\u5982\u8fd9\u91cc\u662f eventbus\r\n    var redisEventSourceStorer = new RedisEventSourceStorer(connectionMultiplexer, "eventbus", 3000);\r\n\r\n    // \u66ff\u6362\u9ed8\u8ba4\u4e8b\u4ef6\u603b\u7ebf\u5b58\u50a8\u5668\r\n    options.ReplaceStorer(serviceProvider =>\r\n    {\r\n        return redisEventSourceStorer;\r\n    });\r\n});\n'})}),"\n",(0,s.jsxs)(n.admonition,{type:"tip",children:[(0,s.jsxs)(n.mdxAdmonitionTitle,{children:["\u5173\u4e8e ",(0,s.jsx)(n.code,{children:"StackExchange.Redis"})," \u8d85\u65f6\u95ee\u9898"]}),(0,s.jsxs)(n.p,{children:["\u5982\u9047\u5230 ",(0,s.jsx)(n.code,{children:"StackExchange.Redis"})," \u8d85\u65f6\uff08Timeout\uff09\u95ee\u9898\uff0c\u53ef\u7f16\u8f91\u542f\u52a8\u5c42\u7684 ",(0,s.jsx)(n.code,{children:".csproj"})," 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\u7248\u672c\u4f7f\u7528\u3002"]})}),"\n",(0,s.jsxs)(n.p,{children:["\u7531\u4e8e\u4f7f\u7528 ",(0,s.jsx)(n.code,{children:"RabbitMQ"})," \u4f5c\u4e3a\u4e8b\u4ef6\u603b\u7ebf\u5b58\u50a8\u5668\u7684\u6bd4\u8f83\u591a\uff0c\u6240\u4ee5\u8fd9\u91cc\u63d0\u4f9b\u4e86\u5b8c\u6574\u7684\u4f7f\u7528\u4f8b\u5b50\u3002"]}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsxs)(n.strong,{children:["1. \u5b89\u88c5 ",(0,s.jsx)(n.code,{children:"RabbitMQ.Client"})," \u62d3\u5c55\u5305"]})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-bash",metastring:"showLineNumbers",children:"Install-Package RabbitMQ.Client\n"})}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsxs)(n.strong,{children:["2. \u521b\u5efa ",(0,s.jsx)(n.code,{children:"RabbitMQEventSourceStorer"})," \u81ea\u5b9a\u4e49\u5b58\u50a8\u5668"]})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {13,41,60,66-78,99-112,122-124,130-134}",children:'using Furion.EventBus;\r\nusing RabbitMQ.Client;\r\nusing RabbitMQ.Client.Events;\r\nusing System;\r\nusing System.Text;\r\nusing System.Text.Json;\r\nusing System.Threading;\r\nusing System.Threading.Channels;\r\nusing System.Threading.Tasks;\r\n\r\nnamespace Furion.Core;\r\n\r\npublic sealed class RabbitMQEventSourceStorer : IEventSourceStorer, IDisposable\r\n{\r\n    /// <summary>\r\n    /// \u5185\u5b58\u901a\u9053\u4e8b\u4ef6\u6e90\u5b58\u50a8\u5668\r\n    /// </summary>\r\n    private readonly Channel<IEventSource> _channel;\r\n\r\n    /// <summary>\r\n    /// \u901a\u9053\u5bf9\u8c61\r\n    /// </summary>\r\n    private readonly IModel _model;\r\n\r\n    /// <summary>\r\n    /// \u8fde\u63a5\u5bf9\u8c61\r\n    /// </summary>\r\n    private readonly IConnection _connection;\r\n\r\n    /// <summary>\r\n    /// \u8def\u7531\u952e\r\n    /// </summary>\r\n    private readonly string _routeKey;\r\n\r\n    /// <summary>\r\n    /// \u6784\u9020\u51fd\u6570\r\n    /// </summary>\r\n    /// <param name="factory">\u8fde\u63a5\u5de5\u5382</param>\r\n    /// <param name="routeKey">\u8def\u7531\u952e</param>\r\n    /// <param name="capacity">\u5b58\u50a8\u5668\u6700\u591a\u80fd\u591f\u5904\u7406\u591a\u5c11\u6d88\u606f\uff0c\u8d85\u8fc7\u8be5\u5bb9\u91cf\u8fdb\u5165\u7b49\u5f85\u5199\u5165</param>\r\n    public RabbitMQEventSourceStorer(ConnectionFactory factory, string routeKey, int capacity)\r\n    {\r\n        // \u914d\u7f6e\u901a\u9053\uff0c\u8bbe\u7f6e\u8d85\u51fa\u9ed8\u8ba4\u5bb9\u91cf\u540e\u8fdb\u5165\u7b49\u5f85\r\n        var boundedChannelOptions = new BoundedChannelOptions(capacity)\r\n        {\r\n            FullMode = BoundedChannelFullMode.Wait\r\n        };\r\n\r\n        // \u521b\u5efa\u6709\u9650\u5bb9\u91cf\u901a\u9053\r\n        _channel = Channel.CreateBounded<IEventSource>(boundedChannelOptions);\r\n\r\n        // \u521b\u5efa\u8fde\u63a5\r\n        _connection = factory.CreateConnection();\r\n        _routeKey = routeKey;\r\n\r\n        // \u521b\u5efa\u901a\u9053\r\n        _model = _connection.CreateModel();\r\n\r\n        // \u58f0\u660e\u8def\u7531\u961f\u5217\r\n        _model.QueueDeclare(routeKey, false, false, false, null);\r\n\r\n        // \u521b\u5efa\u6d88\u606f\u8ba2\u9605\u8005\r\n        var consumer = new EventingBasicConsumer(_model);\r\n\r\n        // \u8ba2\u9605\u6d88\u606f\u5e76\u5199\u5165\u5185\u5b58 Channel\r\n        consumer.Received += (ch, ea) =>\r\n        {\r\n            // \u8bfb\u53d6\u539f\u59cb\u6d88\u606f\r\n            var stringEventSource = Encoding.UTF8.GetString(ea.Body.ToArray());\r\n\r\n            // \u8f6c\u6362\u4e3a IEventSource\uff0c\u8fd9\u91cc\u53ef\u4ee5\u9009\u62e9\u81ea\u5df1\u559c\u6b22\u7684\u5e8f\u5217\u5316\u5de5\u5177\uff0c\u5982\u679c\u81ea\u5b9a\u4e49\u4e86 EventSource\uff0c\u6ce8\u610f\u5c5e\u6027\u662f\u53ef\u8bfb\u53ef\u5199\r\n            var eventSource = JsonSerializer.Deserialize<ChannelEventSource>(stringEventSource);\r\n\r\n            // \u5199\u5165\u5185\u5b58\u7ba1\u9053\u5b58\u50a8\u5668\r\n            _channel.Writer.WriteAsync(eventSource);\r\n\r\n            // \u786e\u8ba4\u8be5\u6d88\u606f\u5df2\u88ab\u6d88\u8d39\r\n            _model.BasicAck(ea.DeliveryTag, false);\r\n        };\r\n\r\n        // \u542f\u52a8\u6d88\u8d39\u8005 \u8bbe\u7f6e\u4e3a\u624b\u52a8\u5e94\u7b54\u6d88\u606f\r\n        _model.BasicConsume(routeKey, false, consumer);\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u5c06\u4e8b\u4ef6\u6e90\u5199\u5165\u5b58\u50a8\u5668\r\n    /// </summary>\r\n    /// <param name="eventSource">\u4e8b\u4ef6\u6e90\u5bf9\u8c61</param>\r\n    /// <param name="cancellationToken">\u53d6\u6d88\u4efb\u52a1 Token</param>\r\n    /// <returns><see cref="ValueTask"/></returns>\r\n    public async ValueTask WriteAsync(IEventSource eventSource, CancellationToken cancellationToken)\r\n    {\r\n        // \u7a7a\u68c0\u67e5\r\n        if (eventSource == default)\r\n        {\r\n            throw new ArgumentNullException(nameof(eventSource));\r\n        }\r\n\r\n        // \u8fd9\u91cc\u5224\u65ad\u662f\u5426\u662f ChannelEventSource \u6216\u8005 \u81ea\u5b9a\u4e49\u7684 EventSource\r\n        if (eventSource is ChannelEventSource source)\r\n        {\r\n            // \u5e8f\u5217\u5316\uff0c\u8fd9\u91cc\u53ef\u4ee5\u9009\u62e9\u81ea\u5df1\u559c\u6b22\u7684\u5e8f\u5217\u5316\u5de5\u5177\r\n            var data = Encoding.UTF8.GetBytes(JsonSerializer.Serialize(source));\r\n\r\n            // \u53d1\u5e03\r\n            _model.BasicPublish("", _routeKey, null, data);\r\n        }\r\n        else\r\n        {\r\n            // \u8fd9\u91cc\u5904\u7406\u52a8\u6001\u8ba2\u9605\u95ee\u9898\r\n            await _channel.Writer.WriteAsync(eventSource, cancellationToken);\r\n        }\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u4ece\u5b58\u50a8\u5668\u4e2d\u8bfb\u53d6\u4e00\u6761\u4e8b\u4ef6\u6e90\r\n    /// </summary>\r\n    /// <param name="cancellationToken">\u53d6\u6d88\u4efb\u52a1 Token</param>\r\n    /// <returns>\u4e8b\u4ef6\u6e90\u5bf9\u8c61</returns>\r\n    public async ValueTask<IEventSource> ReadAsync(CancellationToken cancellationToken)\r\n    {\r\n        // \u8bfb\u53d6\u4e00\u6761\u4e8b\u4ef6\u6e90\r\n        var eventSource = await _channel.Reader.ReadAsync(cancellationToken);\r\n        return eventSource;\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u91ca\u653e\u975e\u6258\u7ba1\u8d44\u6e90\r\n    /// </summary>\r\n    public void Dispose()\r\n    {\r\n        _model.Dispose();\r\n        _connection.Dispose();\r\n    }\r\n}\n'})}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsx)(n.strong,{children:"3. \u66ff\u6362\u9ed8\u8ba4\u4e8b\u4ef6\u5b58\u50a8\u5668"})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {1,4-8,11,14-16}",children:'services.AddEventBus(options =>\r\n{\r\n    // \u521b\u5efa\u8fde\u63a5\u5de5\u5382\r\n    var factory = new ConnectionFactory\r\n    {\r\n        UserName = "admin",\r\n        Password = "q1w2e3",\r\n    };\r\n\r\n    // \u521b\u5efa\u9ed8\u8ba4\u5185\u5b58\u901a\u9053\u4e8b\u4ef6\u6e90\u5bf9\u8c61\uff0c\u53ef\u81ea\u5b9a\u4e49\u961f\u5217\u8def\u7531key\uff0c\u6bd4\u5982\u8fd9\u91cc\u662f eventbus\r\n    var rbmqEventSourceStorer = new RabbitMQEventSourceStorer(factory, "eventbus", 3000);\r\n\r\n    // \u66ff\u6362\u9ed8\u8ba4\u4e8b\u4ef6\u603b\u7ebf\u5b58\u50a8\u5668\r\n    options.ReplaceStorer(serviceProvider =>\r\n    {\r\n        return rbmqEventSourceStorer;\r\n    });\r\n});\n'})}),"\n",(0,s.jsx)("img",{src:(0,i.Z)("img/evs1.png")}),"\n",(0,s.jsxs)(n.h3,{id:"2243-kafka-\u81ea\u5b9a\u4e49\u6307\u5357",children:["22.4.3 ",(0,s.jsx)(n.code,{children:"Kafka"})," \u81ea\u5b9a\u4e49\u6307\u5357"]}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsxs)(n.strong,{children:["1. \u5b89\u88c5 ",(0,s.jsx)(n.code,{children:"Confluent.Kafka"})," \u62d3\u5c55\u5305"]})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-bash",metastring:"showLineNumbers",children:"Install-Package Confluent.Kafka\n"})}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsxs)(n.strong,{children:["2. \u521b\u5efa ",(0,s.jsx)(n.code,{children:"EventConsumer"})," \u8ba2\u9605\u7c7b"]})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {10}",children:'using Confluent.Kafka;\r\n\r\nnamespace Furion.Core;\r\n\r\n/// <summary>\r\n/// Kafka \u6d88\u606f\u6269\u5c55\r\n/// </summary>\r\n/// <typeparam name="TKey"></typeparam>\r\n/// <typeparam name="TValue"></typeparam>\r\npublic class EventConsumer<TKey, TValue> : IDisposable\r\n{\r\n    private Task _consumerTask;\r\n    private CancellationTokenSource _consumerCts;\r\n\r\n    /// <summary>\r\n    /// \u6d88\u8d39\u8005\r\n    /// </summary>\r\n    public IConsumer<TKey, TValue> Consumer { get; }\r\n\r\n    /// <summary>\r\n    /// ConsumerBuilder\r\n    /// </summary>\r\n    public ConsumerBuilder<TKey, TValue> Builder { get; set; }\r\n\r\n    /// <summary>\r\n    /// \u6d88\u606f\u56de\u8c03\r\n    /// </summary>\r\n    public event EventHandler<ConsumeResult<TKey, TValue>> Received;\r\n\r\n    /// <summary>\r\n    /// \u5f02\u5e38\u56de\u8c03\r\n    /// </summary>\r\n    public event EventHandler<ConsumeException> OnConsumeException;\r\n\r\n    /// <summary>\r\n    /// \u6784\u9020\u51fd\u6570\r\n    /// </summary>\r\n    /// <param name="config"></param>\r\n    public EventConsumer(IEnumerable<KeyValuePair<string, string>> config)\r\n    {\r\n        Builder = new ConsumerBuilder<TKey, TValue>(config);\r\n        Consumer = Builder.Build();\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u542f\u52a8\r\n    /// </summary>\r\n    /// <exception cref="InvalidOperationException"></exception>\r\n    public void Start()\r\n    {\r\n        if (Consumer.Subscription?.Any() != true)\r\n        {\r\n            throw new InvalidOperationException("Subscribe first using the Consumer.Subscribe() function");\r\n        }\r\n        if (_consumerTask != null)\r\n        {\r\n            return;\r\n        }\r\n        _consumerCts = new CancellationTokenSource();\r\n        var ct = _consumerCts.Token;\r\n        _consumerTask = Task.Factory.StartNew(() =>\r\n        {\r\n            while (!ct.IsCancellationRequested)\r\n            {\r\n                try\r\n                {\r\n                    var cr = Consumer.Consume(TimeSpan.FromSeconds(1));\r\n                    if (cr == null) continue;\r\n                    Received?.Invoke(this, cr);\r\n                }\r\n                catch (ConsumeException e)\r\n                {\r\n                    OnConsumeException?.Invoke(this, e);\r\n                }\r\n            }\r\n        }, ct, TaskCreationOptions.LongRunning, System.Threading.Tasks.TaskScheduler.Default);\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u505c\u6b62\r\n    /// </summary>\r\n    /// <returns></returns>\r\n    public async Task Stop()\r\n    {\r\n        if (_consumerCts == null || _consumerTask == null) return;\r\n        _consumerCts.Cancel();\r\n        try\r\n        {\r\n            await _consumerTask;\r\n        }\r\n        finally\r\n        {\r\n            _consumerTask = null;\r\n            _consumerCts = null;\r\n        }\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u91ca\u653e\r\n    /// </summary>\r\n    public void Dispose()\r\n    {\r\n        Dispose(true);\r\n        GC.SuppressFinalize(this);\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u91ca\u653e\r\n    /// </summary>\r\n    /// <param name="disposing"></param>\r\n    protected virtual void Dispose(bool disposing)\r\n    {\r\n        if (disposing)\r\n        {\r\n            if (_consumerTask != null)\r\n            {\r\n                Stop().Wait();\r\n            }\r\n            Consumer?.Dispose();\r\n        }\r\n    }\r\n}\n'})}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsxs)(n.strong,{children:["3. \u521b\u5efa ",(0,s.jsx)(n.code,{children:"KafkaEventSourceStore"})," \u81ea\u5b9a\u4e49\u5b58\u50a8\u5668"]})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {11,55-63,84-99,109-110,119-120}",children:'using Confluent.Kafka;\r\nusing Furion.EventBus;\r\nusing Newtonsoft.Json;\r\nusing System.Threading.Channels;\r\n\r\nnamespace Furion.Core;\r\n\r\n/// <summary>\r\n/// Kafka \u5b58\u50a8\u6e90\r\n/// </summary>\r\npublic class KafkaEventSourceStore : IEventSourceStorer, IDisposable\r\n{\r\n    /// <summary>\r\n    /// \u5185\u5b58\u901a\u9053\u4e8b\u4ef6\u6e90\u5b58\u50a8\u5668\r\n    /// </summary>\r\n    private readonly Channel<IEventSource> _channel;\r\n    /// <summary>\r\n    /// \u4e3b\u9898\r\n    /// </summary>\r\n    private readonly string _topic;\r\n    /// <summary>\r\n    /// \u6d88\u8d39\u8005\r\n    /// </summary>\r\n    private readonly EventConsumer<Null, string> _eventConsumer;\r\n    /// <summary>\r\n    /// \u751f\u4ea7\u8005\r\n    /// </summary>\r\n    private readonly IProducer<Null, string> _producer;\r\n\r\n    /// <summary>\r\n    /// \u6784\u9020\u51fd\u6570\r\n    /// </summary>\r\n    /// <param name="consumerConf">\u6d88\u8d39\u8005\u914d\u7f6e</param>\r\n    /// <param name="producerConf">\u751f\u4ea7\u8005\u914d\u7f6e</param>\r\n    /// <param name="topic">\u4e3b\u9898</param>\r\n    /// <param name="capacity">\u5b58\u50a8\u5668\u6700\u591a\u80fd\u591f\u5904\u7406\u591a\u5c11\u6d88\u606f\uff0c\u8d85\u8fc7\u8be5\u5bb9\u91cf\u8fdb\u5165\u7b49\u5f85\u5199\u5165</param>\r\n    public KafkaEventSourceStore(ConsumerConfig consumerConf, ProducerConfig producerConf, string topic, int capacity)\r\n    {\r\n        // \u914d\u7f6e\u901a\u9053\uff0c\u8bbe\u7f6e\u8d85\u51fa\u9ed8\u8ba4\u5bb9\u91cf\u540e\u8fdb\u5165\u7b49\u5f85\r\n        var boundedChannelOptions = new BoundedChannelOptions(capacity)\r\n        {\r\n            FullMode = BoundedChannelFullMode.Wait\r\n        };\r\n\r\n        // \u521b\u5efa\u6709\u9650\u5bb9\u91cf\u901a\u9053\r\n        _channel = Channel.CreateBounded<IEventSource>(boundedChannelOptions);\r\n\r\n        // \u4e3b\u9898\r\n        _topic = topic;\r\n\r\n        // \u521b\u5efa\u6d88\u606f\u8ba2\u9605\u8005\r\n        _eventConsumer = new EventConsumer<Null, string>(consumerConf);\r\n        _eventConsumer.Consumer.Subscribe(new[] { topic });\r\n\r\n        // \u8ba2\u9605\u6d88\u606f\u5199\u5165 Channel\r\n        _eventConsumer.Received += (send, cr) =>\r\n        {\r\n            // \u53cd\u5e8f\u5217\u5316\u6d88\u606f\r\n            var eventSource = JsonConvert.DeserializeObject<ChannelEventSource>(cr.Message.Value);\r\n\r\n            // \u5199\u5165\u5185\u5b58\u7ba1\u9053\u5b58\u50a8\u5668\r\n            _channel.Writer.WriteAsync(eventSource);\r\n        };\r\n\r\n        // \u542f\u52a8\u6d88\u8d39\u8005\r\n        _eventConsumer.Start();\r\n\r\n        // \u521b\u5efa\u751f\u4ea7\u8005\r\n        _producer = new ProducerBuilder<Null, string>(producerConf).Build();\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u5c06\u4e8b\u4ef6\u6e90\u5199\u5165\u5b58\u50a8\u5668\r\n    /// </summary>\r\n    /// <param name="eventSource">\u4e8b\u4ef6\u6e90\u5bf9\u8c61</param>\r\n    /// <param name="cancellationToken">\u53d6\u6d88\u4efb\u52a1 Token</param>\r\n    /// <returns><see cref="ValueTask"/></returns>\r\n    public async ValueTask WriteAsync(IEventSource eventSource, CancellationToken cancellationToken)\r\n    {\r\n        if (eventSource == default)\r\n        {\r\n            throw new ArgumentNullException(nameof(eventSource));\r\n        }\r\n        // \u8fd9\u91cc\u5224\u65ad\u662f\u5426\u662f ChannelEventSource \u6216\u8005 \u81ea\u5b9a\u4e49\u7684 EventSource\r\n        if (eventSource is ChannelEventSource source)\r\n        {\r\n            // \u5e8f\u5217\u5316\r\n            var data = JsonConvert.SerializeObject(source);\r\n            // \u5f02\u6b65\u53d1\u5e03\r\n            await _producer.ProduceAsync(_topic, new Message<Null, string>\r\n            {\r\n                Value = data\r\n            }, cancellationToken);\r\n        }\r\n        else\r\n        {\r\n            // \u8fd9\u91cc\u5904\u7406\u52a8\u6001\u8ba2\u9605\u95ee\u9898\r\n            await _channel.Writer.WriteAsync(eventSource, cancellationToken);\r\n        }\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u4ece\u5b58\u50a8\u5668\u4e2d\u8bfb\u53d6\u4e00\u6761\u4e8b\u4ef6\u6e90\r\n    /// </summary>\r\n    /// <param name="cancellationToken">\u53d6\u6d88\u4efb\u52a1 Token</param>\r\n    /// <returns>\u4e8b\u4ef6\u6e90\u5bf9\u8c61</returns>\r\n    public async ValueTask<IEventSource> ReadAsync(CancellationToken cancellationToken)\r\n    {\r\n        // \u8bfb\u53d6\u4e00\u6761\u4e8b\u4ef6\u6e90\r\n        var eventSource = await _channel.Reader.ReadAsync(cancellationToken);\r\n        return eventSource;\r\n    }\r\n\r\n    /// <summary>\r\n    /// \u91ca\u653e\u975e\u6258\u7ba1\u8d44\u6e90\r\n    /// </summary>\r\n    public async void Dispose()\r\n    {\r\n        await _eventConsumer.Stop();\r\n        GC.SuppressFinalize(this);\r\n    }\r\n}\n'})}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsx)(n.strong,{children:"4. \u66ff\u6362\u9ed8\u8ba4\u4e8b\u4ef6\u5b58\u50a8\u5668"})}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {1,3-8,10-15,18,21-24}",children:'services.AddEventBus(options =>\r\n{\r\n    var consumerConf = new ConsumerConfig\r\n    {\r\n        BootstrapServers = "xxx.xxx.xxx.xxx:9092",\r\n        GroupId = "Consumer",\r\n        AutoOffsetReset = AutoOffsetReset.Earliest // \u4ece\u6700\u65e9\u7684\u5f00\u59cb\u6d88\u8d39\u8d77\r\n    };\r\n\r\n    var producerConf = new ProducerConfig\r\n    {\r\n        BootstrapServers = "xxx.xxx.xxx.xxx:9092",\r\n        BatchSize = 16384, // \u4fee\u6539\u6279\u6b21\u5927\u5c0f\u4e3a16K\r\n        LingerMs = 20 // \u4fee\u6539\u7b49\u5f85\u65f6\u95f4\u4e3a20ms\r\n    };\r\n\r\n    // \u521b\u5efa\u9ed8\u8ba4\u5185\u5b58\u901a\u9053\u4e8b\u4ef6\u6e90\u5bf9\u8c61\uff0c\u53ef\u81ea\u5b9a\u4e49\u961f\u5217\u8def\u7531key\uff0c\u6bd4\u5982\u8fd9\u91cc\u662f eventbus\r\n    var kafkaEventSourceStorer = new KafkaEventSourceStore(consumerConf, producerConf, "testTopic", 30000);\r\n\r\n    // \u66ff\u6362\u9ed8\u8ba4\u4e8b\u4ef6\u603b\u7ebf\u5b58\u50a8\u5668\r\n    options.ReplaceStorer(serviceProvider =>\r\n    {\r\n        return kafkaEventSourceStorer;\r\n    });\r\n});\n'})}),"\n",(0,s.jsx)(n.h2,{id:"225-\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u53d1\u5e03\u8005",children:"22.5 \u81ea\u5b9a\u4e49\u4e8b\u4ef6\u53d1\u5e03\u8005"}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.code,{children:"Furion"})," \u9ed8\u8ba4\u5185\u7f6e\u57fa\u4e8e ",(0,s.jsx)(n.code,{children:"Channel"})," \u7684\u4e8b\u4ef6\u53d1\u5e03\u8005 ",(0,s.jsx)(n.code,{children:"ChannelEventPublisher"}),"\u3002"]}),"\n",(0,s.jsxs)(n.p,{children:["\u5982\u9700\u81ea\u5b9a\u4e49\uff0c\u53ea\u9700\u5b9e\u73b0 ",(0,s.jsx)(n.code,{children:"IEventPublisher"})," \u63a5\u53e3\u5373\u53ef\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers  {1,10}",children:"public class ToDoEventPublisher : IEventPublisher\r\n{\r\n    private readonly IEventSourceStorer _eventSourceStorer;\r\n\r\n    public ToDoEventPublisher(IEventSourceStorer eventSourceStorer)\r\n    {\r\n        _eventSourceStorer = eventSourceStorer;\r\n    }\r\n\r\n    public async Task PublishAsync(IEventSource eventSource)\r\n    {\r\n        await _eventSourceStorer.WriteAsync(eventSource, eventSource.CancellationToken);\r\n    }\r\n\r\n    // .... \u5176\u4ed6\u63a5\u53e3\u5b9e\u73b0\r\n}\n"})}),"\n",(0,s.jsxs)(n.p,{children:["\u6700\u540e\uff0c\u5728\u6ce8\u518c ",(0,s.jsx)(n.code,{children:"EventBus"})," \u670d\u52a1\u4e2d\u66ff\u6362\u9ed8\u8ba4 ",(0,s.jsx)(n.code,{children:"IEventPublisher"}),"\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers  {4}",children:"services.AddEventBus(builder =>\r\n{\r\n    // \u66ff\u6362\u4e8b\u4ef6\u6e90\u5b58\u50a8\u5668\r\n    builder.ReplacePublisher<ToDoEventPublisher>();\r\n});\n"})}),"\n",(0,s.jsx)(n.h2,{id:"226-\u6dfb\u52a0\u4e8b\u4ef6\u6267\u884c\u76d1\u89c6\u5668",children:"22.6 \u6dfb\u52a0\u4e8b\u4ef6\u6267\u884c\u76d1\u89c6\u5668"}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.code,{children:"Furion"})," \u63d0\u4f9b\u4e86 ",(0,s.jsx)(n.code,{children:"IEventHandlerMonitor"})," \u76d1\u89c6\u5668\u63a5\u53e3\uff0c\u5b9e\u73b0\u8be5\u63a5\u53e3\u53ef\u4ee5\u76d1\u89c6\u6240\u6709\u8ba2\u9605\u4e8b\u4ef6\uff0c\u5305\u62ec ",(0,s.jsx)(n.code,{children:"\u6267\u884c\u4e4b\u524d\u3001\u6267\u884c\u4e4b\u540e\uff0c\u6267\u884c\u5f02\u5e38\uff0c\u5171\u4eab\u4e0a\u4e0b\u6587\u6570\u636e"}),"\u3002"]}),"\n",(0,s.jsxs)(n.p,{children:["\u5982\u6dfb\u52a0 ",(0,s.jsx)(n.code,{children:"ToDoEventHandlerMonitor"}),"\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers  {1,9,15}",children:'public class ToDoEventHandlerMonitor : IEventHandlerMonitor\r\n{\r\n    private readonly ILogger<ToDoEventHandlerMonitor> _logger;\r\n    public ToDoEventHandlerMonitor(ILogger<ToDoEventHandlerMonitor> logger)\r\n    {\r\n        _logger = logger;\r\n    }\r\n\r\n    public Task OnExecutingAsync(EventHandlerExecutingContext context)\r\n    {\r\n        _logger.LogInformation("\u6267\u884c\u4e4b\u524d\uff1a{EventId}", context.Source.EventId);\r\n        return Task.CompletedTask;\r\n    }\r\n\r\n    public Task OnExecutedAsync(EventHandlerExecutedContext context)\r\n    {\r\n        _logger.LogInformation("\u6267\u884c\u4e4b\u540e\uff1a{EventId}", context.Source.EventId);\r\n\r\n        if (context.Exception != null)\r\n        {\r\n            _logger.LogError(context.Exception, "\u6267\u884c\u51fa\u9519\u5566\uff1a{EventId}", context.Source.EventId);\r\n        }\r\n\r\n        return Task.CompletedTask;\r\n    }\r\n}\n'})}),"\n",(0,s.jsxs)(n.p,{children:["\u6700\u540e\uff0c\u5728\u6ce8\u518c ",(0,s.jsx)(n.code,{children:"EventBus"})," \u670d\u52a1\u4e2d\u6ce8\u518c ",(0,s.jsx)(n.code,{children:"ToDoEventHandlerMonitor"}),"\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers  {4}",children:"services.AddEventBus(builder =>\r\n{\r\n    // \u6dfb\u52a0\u4e8b\u4ef6\u6267\u884c\u76d1\u89c6\u5668\r\n    builder.AddMonitor<ToDoEventHandlerMonitor>();\r\n});\n"})}),"\n",(0,s.jsx)(n.h2,{id:"227-\u6dfb\u52a0\u4e8b\u4ef6\u6267\u884c\u5668",children:"22.7 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1s \u91cd\u8bd5\uff0c\u6700\u591a\u4e09\u6b21\r\n        await Retry.InvokeAsync(async () => {\r\n            await handler(context);\r\n        }, 3, 1000);\r\n    }\r\n}\n"})}),"\n",(0,s.jsxs)(n.p,{children:["\u6700\u540e\uff0c\u5728\u6ce8\u518c ",(0,s.jsx)(n.code,{children:"EventBus"})," \u670d\u52a1\u4e2d\u6ce8\u518c ",(0,s.jsx)(n.code,{children:"RetryEventHandlerExecutor"}),"\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers  {4}",children:"services.AddEventBus(builder =>\r\n{\r\n    // \u6dfb\u52a0\u4e8b\u4ef6\u6267\u884c\u5668\r\n    builder.AddExecutor<RetryEventHandlerExecutor>();\r\n});\n"})}),"\n",(0,s.jsx)(n.h2,{id:"228-\u4f7f\u7528\u6709\u4f5c\u7528\u57df\u7684\u670d\u52a1",children:"22.8 \u4f7f\u7528\u6709\u4f5c\u7528\u57df\u7684\u670d\u52a1"}),"\n",(0,s.jsxs)(n.p,{children:["\u5728 ",(0,s.jsx)(n.code,{children:"Furion"})," \u4e2d\uff0c ",(0,s.jsx)(n.code,{children:"Event Bus"})," \u6240\u6709\u670d\u52a1\u5747\u6ce8\u518c\u4e3a\u5355\u4f8b\uff0c\u5982\u9700\u4f7f\u7528\u4f5c\u7528\u57df\u670d\u52a1\uff08\u5355\u4f8b\u670d\u52a1\u53ef\u76f4\u63a5\u6ce8\u5165\uff09\uff0c\u53ef\u901a\u8fc7\u4f9d\u8d56\u6ce8\u5165 ",(0,s.jsx)(n.code,{children:"IServiceScopeFactory"})," \u5b9e\u4f8b\u5e76\u901a\u8fc7 ",(0,s.jsx)(n.code,{children:"CreateScope()"})," \u521b\u5efa\u4e00\u4e2a\u4f5c\u7528\u57df\uff0c\u5982\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers  {5,8,10,13,18-22}",children:'public class ToDoEventSubscriber : IEventSubscriber\r\n{\r\n    private readonly ILogger<ToDoEventSubscriber> _logger;\r\n\r\n    public ToDoEventSubscriber(IServiceScopeFactory scopeFactory    // \u5355\u4f8b\u670d\u52a1\u53ef\u4ee5\u76f4\u63a5\u6ce8\u5165\r\n        , ILogger<ToDoEventSubscriber> logger)  // \u5355\u4f8b\u670d\u52a1\u53ef\u4ee5\u76f4\u63a5\u6ce8\u5165\r\n    {\r\n        ScopeFactory = scopeFactory;\r\n        _logger = logger;\r\n        // \u907f\u514d\u5728\u8fd9\u91cc\u89e3\u6790\u975e\u5355\u4f8b\u670d\u52a1\r\n    }\r\n\r\n    public IServiceScopeFactory ScopeFactory { get; }\r\n\r\n    [EventSubscribe("ToDo:Create")]\r\n    public async Task CreateToDo(EventHandlerExecutingContext context)\r\n    {\r\n        // \u521b\u5efa\u65b0\u7684\u4f5c\u7528\u57df\r\n        using var scope = ScopeFactory.CreateScope();\r\n\r\n        // \u89e3\u6790\u670d\u52a1\r\n        var scopedProcessingService = scope.ServiceProvider.GetRequiredService<IScopedProcessingService>();\r\n        // ....\r\n    }\r\n}\n'})}),"\n",(0,s.jsx)(n.admonition,{title:"\u7279\u522b\u6ce8\u610f",type:"important",children:(0,s.jsxs)(n.p,{children:["\u5982\u679c\u662f\u975e\u5355\u4f8b\u5bf9\u8c61\uff0c\u5e94\u907f\u514d\u5728\u6784\u9020\u51fd\u6570\u4e2d\u89e3\u6790\u670d\u52a1\uff0c\u5982\u628a ",(0,s.jsx)(n.code,{children:"scope.ServiceProvider.GetRequiredService<T>()"})," \u653e\u5728\u6784\u9020\u51fd\u6570\u4e2d\u521d\u59cb\u5316\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u670d\u52a1\u65e0\u6cd5\u4f7f\u7528\u3002"]})}),"\n",(0,s.jsx)(n.h2,{id:"229-\u8ba2\u9605\u6267\u884c\u4efb\u52a1\u610f\u5916\u5f02\u5e38",children:"22.9 \u8ba2\u9605\u6267\u884c\u4efb\u52a1\u610f\u5916\u5f02\u5e38"}),"\n",(0,s.jsxs)(n.p,{children:["\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u4f7f\u7528\u7684\u662f ",(0,s.jsx)(n.code,{children:"Task"})," \u5bf9\u8c61\u8fdb\u884c\u521b\u5efa\u5e76\u6267\u884c\uff0c\u4f46\u53ef\u80fd\u5b58\u5728\u4e00\u4e9b\u610f\u5916\u4e14\u96be\u4ee5\u6355\u83b7\u7684\u5f02\u5e38\uff0c\u8fd9\u65f6\u5019\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u8ba2\u9605\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers  {4}",children:"services.AddEventBus(builder =>\r\n{\r\n    // \u8ba2\u9605 EventBus \u610f\u5916\u672a\u6355\u83b7\u5f02\u5e38\r\n    builder.UnobservedTaskExceptionHandler = (obj, args) =>\r\n    {\r\n        // ....\r\n    };\r\n});\n"})}),"\n",(0,s.jsx)(n.h2,{id:"2210-\u4e8b\u4ef6\u603b\u7ebf\u5de5\u5382",children:"22.10 \u4e8b\u4ef6\u603b\u7ebf\u5de5\u5382"}),"\n",(0,s.jsx)(n.admonition,{title:"\u7248\u672c\u8bf4\u660e",type:"important",children:(0,s.jsxs)(n.p,{children:["\u4ee5\u4e0b\u5185\u5bb9\u4ec5\u9650 ",(0,s.jsx)(n.code,{children:"Furion 4.2.10 +"})," \u7248\u672c\u4f7f\u7528\u3002"]})}),"\n",(0,s.jsxs)(n.p,{children:["\u5728\u8be5\u7248\u672c\u4e2d\uff0c",(0,s.jsx)(n.code,{children:"Furion"})," \u63d0\u4f9b\u4e86 ",(0,s.jsx)(n.code,{children:"IEventBusFactory"})," \u5de5\u5382\u670d\u52a1\uff0c\u53ef\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u65b0\u589e\u6216\u5220\u9664\u8ba2\u9605\uff0c\u5982\uff1a"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {4,14-17,24}",children:'public class TestEventBus : IDynamicApiController\r\n{\r\n    private readonly IEventPublisher _eventPublisher;\r\n    private readonly IEventBusFactory _eventBusFactory;\r\n    public TestEventBus(IEventPublisher eventPublisher, IEventBusFactory eventBusFactory)\r\n    {\r\n        _eventPublisher = eventPublisher;\r\n        _eventBusFactory = eventBusFactory;\r\n    }\r\n\r\n    // \u8fd0\u884c\u65f6\u52a8\u6001\u6dfb\u52a0\u4e00\u4e2a\u8ba2\u9605\u5668\r\n    public async Task AddSubscriber()\r\n    {\r\n        await _eventBusFactory.Subscribe("xxx", async (ctx) =>\r\n        {\r\n            Console.WriteLine("\u6211\u662f\u52a8\u6001\u7684");\r\n            await Task.CompletedTask;\r\n        });\r\n    }\r\n\r\n    // \u8fd0\u884c\u65f6\u52a8\u6001\u5220\u9664\u4e00\u4e2a\u8ba2\u9605\u5668\r\n    public async Task RemoveDynamic(string eventId)\r\n    {\r\n        await _eventBusFactory.Unsubscribe(eventId);\r\n    }\r\n}\n'})}),"\n",(0,s.jsxs)(n.h2,{id:"2211-messagecenter-\u9759\u6001\u7c7b",children:["22.11 ",(0,s.jsx)(n.code,{children:"MessageCenter"})," 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Task.CompletedTask;\r\n});\r\n\r\n// \u53d6\u6d88\u8ba2\u9605\r\nMessageCenter.Unsubscribe("messageId");\n'})}),"\n",(0,s.jsx)(n.h2,{id:"2212-\u914d\u7f6e\u91cd\u8bd5\u5931\u8d25\u56de\u8c03",children:"22.12 \u914d\u7f6e\u91cd\u8bd5\u5931\u8d25\u56de\u8c03"}),"\n",(0,s.jsx)(n.admonition,{title:"\u7248\u672c\u8bf4\u660e",type:"important",children:(0,s.jsxs)(n.p,{children:["\u4ee5\u4e0b\u5185\u5bb9\u4ec5\u9650 ",(0,s.jsx)(n.code,{children:"Furion 4.6.1 +"})," \u7248\u672c\u4f7f\u7528\u3002"]})}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["\u521b\u5efa ",(0,s.jsx)(n.code,{children:"IEventFallbackPolicy"})," \u5b9e\u73b0\u7c7b\u5e76\u5b9e\u73b0 ",(0,s.jsx)(n.code,{children:"Callback"})," \u65b9\u6cd5\uff0c\u5982 ",(0,s.jsx)(n.code,{children:"EventFallbackPolicy"}),"\uff1a"]}),"\n"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {1,9}",children:'public class EventFallbackPolicy : IEventFallbackPolicy\r\n{\r\n    private readonly ILogger<EventFallbackPolicy> _logger;\r\n    public EventFallbackPolicy(ILogger<EventFallbackPolicy> logger)\r\n    {\r\n        _logger = logger;\r\n    }\r\n\r\n    public async Task CallbackAsync(EventHandlerExecutingContext context, Exception ex)\r\n    {\r\n        _logger.LogError(ex, "\u91cd\u8bd5\u4e86\u591a\u6b21\u6700\u7ec8\u8fd8\u662f\u5931\u8d25\u4e86");\r\n        await Task.CompletedTask;\r\n    }\r\n}\n'})}),"\n",(0,s.jsxs)(n.ol,{start:"2",children:["\n",(0,s.jsxs)(n.li,{children:["\u6ce8\u518c ",(0,s.jsx)(n.code,{children:"EventFallbackPolicy"})," \u7c7b\u578b\u670d\u52a1"]}),"\n"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-cs",metastring:"showLineNumbers {1,3}",children:"services.AddEventBus(options =>\r\n{\r\n    options.AddFallbackPolicy<EventFallbackPolicy>();\r\n});\n"})}),"\n",(0,s.jsxs)(n.ol,{start:"3",children:["\n",(0,s.jsxs)(n.li,{children:["\u901a\u8fc7 ",(0,s.jsx)(n.code,{children:"[EventSubscribe]"})," 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