使用EFCore持久性自动命名的多个状态机不起作用

如何解决使用EFCore持久性自动命名的多个状态机不起作用

我们正在使用具有自动别名功能的Masstransit和InMemoryRepository来实现传奇持久性。我们大约配置了3个状态机，并且工作正常。我们最近从InMemoryRepository更改为EFCore以实现持久性。这导致只有第一个配置的状态机才能正常工作。休息所有状态机甚至都没有进入Initially事件。需要帮助以了解实施是否正确。下面是代码详细信息：

masstransit状态机设置

 services.AddMassTransit(x =>
        {
            x.AddBus(provider => MassTransit.Bus.Factory.CreateUsingRabbitMq(cfg =>
            {
                cfg.Host(hostUri,hst =>
                {
                    hst.Username(appSettings.RabbitMQ.Username);
                    hst.Password(appSettings.RabbitMQ.Password);
                });

                cfg.ReceiveEndpoint("microservice-response",e =>
                {
                    AddConsumers(e,provider);
                    e.ConfigureSaga<ServiceRequest1RegisterState>(provider);
                    e.ConfigureSaga<ServiceRequest1UpdateState>(provider);
                    e.ConfigureSaga<ServiceRequest1ApproveState>(provider);
                });
            }));

            ////x.AddSagaStateMachine<ServiceRequest1RegisterStateMachine,ServiceRequest1RegisterState>()
            ////   .InMemoryRepository();
            ////x.AddSagaStateMachine<ServiceRequest1UpdateStateMachine,ServiceRequest1UpdateState>()
            ////   .InMemoryRepository();
            ////x.AddSagaStateMachine<ServiceRequest1ApproveStateMachine,ServiceRequest1ApproveState>()
            ////   .InMemoryRepository();

            x.AddSagaStateMachine<ServiceRequest1RegisterStateMachine,ServiceRequest1RegisterState>()
                .EntityFrameworkRepository(r =>
                {
                    r.ConcurrencyMode = ConcurrencyMode.Pessimistic; // or use Optimistic,which requires RowVersion

                    r.AddDbContext<DbContext,ServiceRequest1RegisterStateDbContext>((provider,builder) =>
                    {
                        builder.UseSqlServer(configuration.GetConnectionString("StateDBConnection"),m =>
                        {
                            m.MigrationsAssembly(Assembly.GetExecutingAssembly().GetName().Name);
                            m.MigrationsHistoryTable($"__{nameof(ServiceRequest1RegisterStateDbContext)}");
                        });
                    });
                });

    x.AddSagaStateMachine<ServiceRequest1UpdateStateMachine,ServiceRequest1UpdateState>()
                .EntityFrameworkRepository(r =>
                {
                    r.ConcurrencyMode = ConcurrencyMode.Pessimistic; // or use Optimistic,ServiceRequest1UpdateStateDbContext>((provider,m =>
                        {
                            m.MigrationsAssembly(Assembly.GetExecutingAssembly().GetName().Name);
                            m.MigrationsHistoryTable($"__{nameof(ServiceRequest1UpdateStateDbContext)}");
                        });
                    });
                });

            x.AddSagaStateMachine<ServiceRequest1ApproveStateMachine,ServiceRequest1ApproveState>()
                .EntityFrameworkRepository(r =>
                {
                    r.ConcurrencyMode = ConcurrencyMode.Pessimistic; // or use Optimistic,ServiceRequest1ApproveStateDbContext>((provider,m =>
                        {
                            m.MigrationsAssembly(Assembly.GetExecutingAssembly().GetName().Name);
                            m.MigrationsHistoryTable($"__{nameof(ServiceRequest1ApproveStateDbContext)}");
                        });
                    });
                });
        });

        services.AddSingleton<IHostedService,MassTransitBusService>();

所有3个状态机的DBContext如下所示

 public class ServiceRequest1ApproveStateDbContext : SagaDbContext
{
    public ServiceRequest1ApproveStateDbContext(DbContextOptions<ServiceRequest1ApproveStateDbContext> options)
        : base(options)
    {
    }

    /// <summary>
    /// Gets the configurations.
    /// </summary>
    protected override IEnumerable<ISagaClassMap> Configurations
    {
        get { yield return new ServiceRequest1ApproveStateMap(); }
    }
}

下面的状态图

public class ServiceRequest1ApproveStateMap : SagaClassMap<ServiceRequest1ApproveState>
{
    protected override void Configure(EntityTypeBuilder<ServiceRequest1ApproveState> entity,ModelBuilder model)
    {
        entity.Property(x => x.CurrentState).HasMaxLength(64);
        entity.Property(x => x.Id);
        entity.Property(x => x.ServiceId);
        entity.Property(x => x.ReadyEventStatus);
    }
}

从上面的代码中，只有ServiceRequest1RegisterStateMachine可以完美运行，其余的状态机甚至都不会进入Initially。我可以确认所有迁移都是事先完成的，并且只有1个存储库配置时，这些状态机都可以单独正常运行，即，如果仅ServiceRequest1ApproveStateMachine的repo config，则此状态机可以正常工作。但是，如果所有3个repo配置都存在，则只有第1个有效。 我需要有关使用EFCore正确实现传奇持久性的指导。我是否应该尝试使用masstransit docs（https://masstransit-project.com/usage/sagas/efcore.html）

中提到的使用单个dbcontext实现

解决方法

以下是我为确保状态机按预期工作所做的更改。即使我们最初的状态机实现是基于sqlserver efcore持久性的文档，更改也是基于@Chris建议的注释进行的。

services.AddDbContext<ServiceRequest1RegisterStateDbContext>(x =>
                     x.UseSqlServer(configuration.GetConnectionString("StateDBConnection")));
        services.AddDbContext<ServiceRequest1UpdateStateDbContext>(x =>
                       x.UseSqlServer(configuration.GetConnectionString("StateDBConnection")));
        services.AddDbContext<ServiceRequest1ApproveStateDbContext>(x =>
                        x.UseSqlServer(configuration.GetConnectionString("StateDBConnection")));

services.AddMassTransit(x =>
    {
        x.AddBus(provider => MassTransit.Bus.Factory.CreateUsingRabbitMq(cfg =>
        {
            cfg.Host(hostUri,hst =>
            {
                hst.Username(appSettings.RabbitMQ.Username);
                hst.Password(appSettings.RabbitMQ.Password);
            });

            cfg.ReceiveEndpoint("microservice-response",e =>
            {
                AddConsumers(e,provider);
                e.ConfigureSaga<ServiceRequest1RegisterState>(provider);
                e.ConfigureSaga<ServiceRequest1UpdateState>(provider);
                e.ConfigureSaga<ServiceRequest1ApproveState>(provider);
            });
        }));

        ////x.AddSagaStateMachine<ServiceRequest1RegisterStateMachine,ServiceRequest1RegisterState>()
        ////   .InMemoryRepository();
        ////x.AddSagaStateMachine<ServiceRequest1UpdateStateMachine,ServiceRequest1UpdateState>()
        ////   .InMemoryRepository();
        ////x.AddSagaStateMachine<ServiceRequest1ApproveStateMachine,ServiceRequest1ApproveState>()
        ////   .InMemoryRepository();

        x.AddSagaStateMachine<ServiceRequest1RegisterStateMachine,ServiceRequest1RegisterState>()
            .EntityFrameworkRepository(r =>
            {
                r.ConcurrencyMode = ConcurrencyMode.Pessimistic; // or use Optimistic,which requires RowVersion

                r.ExistingDbContext<ServiceRequest1RegisterStateDbContext>();
            });

x.AddSagaStateMachine<ServiceRequest1UpdateStateMachine,ServiceRequest1UpdateState>()
            .EntityFrameworkRepository(r =>
            {
                r.ConcurrencyMode = ConcurrencyMode.Pessimistic; // or use Optimistic,which requires RowVersion

                r.ExistingDbContext<ServiceRequest1UpdateStateDbContext>();
            });

        x.AddSagaStateMachine<ServiceRequest1ApproveStateMachine,ServiceRequest1ApproveState>()
            .EntityFrameworkRepository(r =>
            {
                r.ConcurrencyMode = ConcurrencyMode.Pessimistic; // or use Optimistic,which requires RowVersion

                r.ExistingDbContext<ServiceRequest1ApproveStateDbContext>();
            });
    });

    services.AddSingleton<IHostedService,MassTransitBusService>();

}