.NET 云原生架构师训练营（模块二 基础巩固 Masstransit 异常处理）--学习笔记

public class SubmitOrderConsumer :
    IConsumer<SubmitOrder>
{
    public Task Consume(ConsumeContext<SubmitOrder> context)
    {
        throw new Exception("Very bad things happened");
    }
}

var sessionFactory = CreateSessionFactory();

var busControl = Bus.Factory.CreateUsingRabbitMq(cfg =>
{
    cfg.Host("rabbitmq://localhost/");

    cfg.ReceiveEndpoint("submit-order", e =>
    {
        e.UseMessageRetry(r => r.Immediate(5));

        e.Consumer(() => new SubmitOrderConsumer(sessionFactory));
    });
});

// 立即重试：一共连续重试10次
ep.UseMessageRetry(r => r.Immediate(10));

// 间隔重试：一共重试10次，每次间隔10秒
ep.UseMessageRetry(r => r.Interval(10, TimeSpan.FromSeconds(10)));

// 多个间隔重试：5秒后第一次，5+10秒后第二次，5+10+15秒后第三次
ep.UseMessageRetry(r => r.Intervals(TimeSpan.FromSeconds(5), TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(15)));

// 指数级间隔重试：共10次，每次间隔：当前重试次数 * 60秒
ep.UseMessageRetry(r => r.Exponential(10, TimeSpan.FromSeconds(60), TimeSpan.FromHours(24), TimeSpan.FromSeconds(60)));

// 每次叠加50秒
ep.UseMessageRetry(r => r.Incremental(10, TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(50)));

e.UseMessageRetry(r => 
{
    r.Handle<ArgumentNullException>();
    r.Ignore(typeof(InvalidOperationException), typeof(InvalidCastException));
    r.Ignore<ArgumentException>(t => t.ParamName == "orderTotal");
});

cfg.ReceiveEndpoint("submit-order", e =>
{
    e.UseScheduledRedelivery(r => r.Intervals(TimeSpan.FromMinutes(5), TimeSpan.FromMinutes(15), TimeSpan.FromMinutes(30)));
    e.UseMessageRetry(r => r.Immediate(5));
    e.Consumer(() => new SubmitOrderConsumer(sessionFactory));
});

cfg.ReceiveEndpoint("submit-order", e =>
{
    e.UseScheduledRedelivery(r => r.Intervals(TimeSpan.FromMinutes(5), TimeSpan.FromMinutes(15), TimeSpan.FromMinutes(30)));
    e.UseMessageRetry(r => r.Immediate(5));
    e.UseInMemoryOutbox();

    e.Consumer(() => new SubmitOrderConsumer(sessionFactory));
});

public interface Fault<T>
    where T : class
{
    Guid FaultId { get; }
    Guid? FaultedMessageId { get; }
    DateTime Timestamp { get; }
    ExceptionInfo[] Exceptions { get; }
    HostInfo Host { get; }
    T Message { get; }
}

public class DashboardFaultConsumer :
    IConsumer<Fault<SubmitOrder>>
{
    public async Task Consume(ConsumeContext<Fault<SubmitOrder>> context)
    {
        // update the dashboard
    }
}

cfg.ReceiveEndpoint("input-queue", ec =>
{
    ec.DiscardFaultedMessages();
});

cfg.ReceiveEndpoint("input-queue", ec =>
{
    ec.DiscardSkippedMessages();
});