How to Call ApplicationService Method From RabbitMq HandleEventAsync #3170 | Support

shijo created 2 years ago

ABP Framework version: v5.2.0
UI type: Angular
DB provider: EF Core
Tiered (MVC) or Identity Server Separated (Angular): yes
Exception message and stack trace:
Steps to reproduce the issue:"

I have implemented RabbitMq in my application, I am getting an exception inside HandleEventAsync when trying to access application service implemented class method. I tried to implement [UnitOfWork], but still, I am getting exceptions.

11 Answer(s)

0

liangshiwei created 2 years ago
Support Team Fullstack Developer

Hi,

Can you share the exception message and stack trace and related code?
0

shijo created 2 years ago

at Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(ResolveRequest request) at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable1 parameters, Object& instance) at Autofac.ResolutionExtensions.ResolveOptionalService(IComponentContext context, Service service, IEnumerable1 parameters) at Volo.Abp.DependencyInjection.AbpLazyServiceProvider.<>c__DisplayClass12_0.<LazyGetService>b__0() at Volo.Abp.DependencyInjection.AbpLazyServiceProvider.LazyGetService(Type serviceType) at Volo.Abp.DependencyInjection.AbpLazyServiceProvider.LazyGetService(Type serviceType, Object defaultValue) at Volo.Abp.DependencyInjection.AbpLazyServiceProvider.LazyGetService[T](T defaultValue) at Volo.Abp.Application.Services.ApplicationService.get_GuidGenerator() at Akadimi.Books.BookAppDistEventService.<CreateAsync>d__8.MoveNext() in D:\Akadimi\Akadimi\aspnet-core\src\Akadimi.Application\Books\BookAppDistEventService.cs:line 79 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at Akadimi.Books.BookAppDistEventService.<>c__DisplayClass7_0.<
0

liangshiwei created 2 years ago
Support Team Fullstack Developer

Hi,

Sorry, It's not enough to reproduce the problem.

Can you please share a project with me? shiwei.liang@volosoft.com. It will help us solve this problem quickly. thanks.

shijo created 2 years ago

    public class BooksAppService: ApplicationService, IBooksAppService, IDistributedEventHandler<APIBookEto>
    {
        private readonly BookManager _bookManager;
        public BooksAppService(BookManager bookManager)
        {
            _bookRepository = bookRepository;
            _bookManager = bookManager;
        }
        public virtual async Task<BookDto> CreateAsync(BookCreateDto input)
        {
            var titles = ObjectMapper.Map<List<BookTranslationCreateDto>, List<BookTranslation>>(input.inputTitles);
            var book = await _bookManager.CreateAsync(
            input.NoOfPages, input.Dimensions, input.ISBN10, input.ISBN13, input.Price, input.PublishDate,
            titles, input.BookLanguageId, input.BookMediaTypeId, input.AuthorIds, input.PublisherIds, input.TagIds, input.FileId
            );
            return ObjectMapper.Map<Book, BookDto>(book);
        }
       [UnitOfWork]
        public virtual Task HandleEventAsync(APIBookEto eventData)
        {
            Task.Run(async () =>
            {
                try
                {
                    var input = ObjectMapper.Map<APIBookEto, BookCreateDto>(eventData);
                    var titles = ObjectMapper.Map<List<BookTranslationCreateDto>, List<BookTranslation>>(input.inputTitles);
            var book = await _bookManager.CreateAsync(
            input.NoOfPages, input.Dimensions, input.ISBN10, input.ISBN13, input.Price, input.PublishDate,
            titles, input.BookLanguageId, input.BookMediaTypeId, input.AuthorIds, input.PublisherIds, input.TagIds, input.FileId
            );
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex);
                }
            });
            return Task.CompletedTask;
        }
    }

I can explain the scenario. Here above you can see inside BooksAppService class I have a CreateAsync which is basically inserts data into the database. I have already written all logic inside _bookManager.CreateAsync() function. As you can see I am listening distributed event HandleEventAsync, inside this event function I am executing the same logic which is written in CreateAsync. CreateAsync method is calling through API controller which is perfectly working fine and HandleEventAsync(this is already marked as [UnitOfWork]) is calling through RabbitMq and is throwing the above exceptions.

liangshiwei created 2 years ago

Support Team Fullstack Developer

Hi,

Can you try this?

[UnitOfWork]
public virtual Task HandleEventAsync(APIBookEto eventData)
{
    try
    {
        var input = ObjectMapper.Map(eventData);
        var titles = ObjectMapper.Map, List>(input.inputTitles);
        var book = await _bookManager.CreateAsync(
        input.NoOfPages, input.Dimensions, input.ISBN10, input.ISBN13, input.Price, input.PublishDate,
        titles, input.BookLanguageId, input.BookMediaTypeId, input.AuthorIds, input.PublisherIds, input.TagIds, input.FileId);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex);
    }
}

0

shijo created 2 years ago

Yes, It is passing through but the exception is thrown again where DBContext is accessing.

at Microsoft.EntityFrameworkCore.DbContext.CheckDisposed() at Microsoft.EntityFrameworkCore.DbContext.get_ContextServices() at Microsoft.EntityFrameworkCore.DbContext.get_Model() at Microsoft.EntityFrameworkCore.Internal.InternalDbSet1.get_EntityType() at Microsoft.EntityFrameworkCore.Internal.InternalDbSet1.CheckState() at Microsoft.EntityFrameworkCore.Internal.InternalDbSet1.get_EntityQueryable() at Microsoft.EntityFrameworkCore.Internal.InternalDbSet1.System.Linq.IQueryable.get_Provider() at System.Linq.Queryable.Where[TSource](IQueryable1 source, Expression1 predicate) at Akadimi.Books.BookManager.<SetBookAuthorsAsync>d__9.MoveNext() in D:\Akadimi\Akadimi\aspnet-core\src\Akadimi.Domain\Books\BookManager.cs:line 123 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at Akadimi.Books.BookManager.<CreateAsync>d__7.MoveNext() in D:\Akadimi\Akadimi\aspnet-core\src\Akadimi.Domain\Books\BookManager.cs:line 63 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at Akadimi.Books.BooksAppService.

liangshiwei created 2 years ago

Support Team Fullstack Developer

This is my test code and it works for me:

public class TestAppService : MyProjectNameAppService, IDistributedEventHandler<TestEventData>
{
    private readonly IIdentityRoleRepository _identityRoleRepository;
    private readonly IDistributedEventBus _distributedEventBus;

    public TestAppService(IIdentityRoleRepository identityRoleRepository, IDistributedEventBus distributedEventBus)
    {
        _identityRoleRepository = identityRoleRepository;
        _distributedEventBus = distributedEventBus;
    }

    public virtual async Task PublishAsync()
    {
        await _distributedEventBus.PublishAsync(new TestEventData());
    }

    [UnitOfWork]
    public virtual async Task HandleEventAsync(TestEventData eventData)
    {
        try
        {
            await _identityRoleRepository.InsertAsync(new IdentityRole(Guid.NewGuid(), "test"));
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
        }
        
    }
}

I don't know about your project, Can you share a minimal project that reproduces the problem? thanks.

0

shijo created 2 years ago

If I am using direct Repository it is working, but here i am going through ApplicationService class. I marked all methods with [UnitOfWork] still no luck.
0

liangshiwei created 2 years ago
Support Team Fullstack Developer

Can you share a minimal project that reproduces the problem to make us progress? thanks.
0

shijo created 2 years ago

Ok, I will make a small sample and share it with you. One more thing I noticed, I created a new Class inherited from ApplicationService and implemented IDistributedEventHandler, and paste all coding, which is working fine.

The main difference between the two classes is One is inherited from DomainService and The Other is ApplicationService. If you have any clue just check.

public class BookManager : DomainService Inside this class code is throwing exception

public class BookAppDistEventService : ApplicationService, IDistributedEventHandler<APIBookEto> Inside this class code is working fine.
0

shijo created 2 years ago

I managed to Implement IDistributedEventHandler inside BookManager class. Now it is working..

Have an answer to this question? Log in and write your answer.