MSHelper.CQRS.Queries 1.0.0

MSHelper.CQRS.Queries : Queries

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Overview

Adds an ability to create and process queries in the sense of CQRS.

Installation

This document is for the latest MSHelper.CQRS.Queries 1.0.0 release and later.

dotnet add package MSHelper.CQRS.Queries

Dependencies

-- MSHelper

Usage

Implement IQuery<TResult> interface in the selected class:

public class GetAccount : IQuery<AccountDto>  
{    
  public Guid Id { get; set; }  
}

Create dedicated query handler class that implements IQueryHandler<TQuery, TResult> interface with HandleAsync() method:

public class GetAccountHandler : IQueryHandler<GetAccount, AccountDto>
{
    public Task<AccountDto> HandleAsync(GetAccount query)
    {
        //put the handling code here
    }
}

You can easily register all query handlers in DI container by calling AddQueryHandlers() method on IMSHelperBuilder:

public IServiceProvider ConfigureServices(this IServiceCollection services)
{
    var builder = services.AddMSHelper()
        .AddQueryHandlers();

    //other registrations    
    return builder.Build();
}

Dispatching a particular query object can be also done using MSHelper package. Start with registering in-memory dispatcher on your IMSHelperBuilder by calling a AddInMemoryQueryDispatcher() method:

public IServiceProvider ConfigureServices(this IServiceCollection services)
{
    var builder = services.AddMSHelper()
        .AddQueryHandlers()
        .AddInMemoryQueryDispatcher();

    //other registrations    
    return builder.Build();
}

Then simply inject IQueryDispatcher into a class and call DispatchAsync() method:

public class AccountsService
{
    private readonly IQueryDispatcher _dispatcher;

    public AccountsService(IQueryDispatcher dispatcher)
    {
        _dispatcher = dispatcher;
    } 

    public Task<AccountDto> GetAccountAsync(Guid id)
        => _dispatcher.DispatchAsync(new GetAccount { Id = id });
}

Important Note:

All the MSHelper packages are for self learning purposes inspired by Devmentors.io