Initial code commit.

Sufi.Demo.PeopleDirectory.Application/Features/Contacts/Queries/GetById/GetContactByIdQuery.cs

@@ -0,0 +1,47 @@
+using AutoMapper;
+using FluentValidation;
+using MediatR;
+using Sufi.Demo.PeopleDirectory.Application.Contracts.Repositories;
+using Sufi.Demo.PeopleDirectory.Application.Contracts.Services;
+using Sufi.Demo.PeopleDirectory.Domain.Entities.Misc;
+using Sufi.Demo.PeopleDirectory.Shared.Wrapper;
+
+namespace Sufi.Demo.PeopleDirectory.Application.Features.Contacts.Queries.GetById
+{
+	public class GetContactByIdQuery : IRequest<IResult<GetContactByIdResponse>>
+	{
+		public int Id { get; set; }
+	}
+
+	public sealed class GetContactByIdQueryValidator : AbstractValidator<GetContactByIdQuery>
+	{
+		public GetContactByIdQueryValidator()
+		{
+			RuleFor(v => v.Id)
+				.GreaterThan(0)
+				.WithMessage("A valid Id is required.");
+		}
+	}
+
+	public class GetContactByIdQueryHandler(
+		IUnitOfWork<int> unitOfWork, 
+		IMapper mapper,
+		IAppCache appCache
+		) : IRequestHandler<GetContactByIdQuery, IResult<GetContactByIdResponse>>
+	{
+		public async Task<IResult<GetContactByIdResponse>> Handle(GetContactByIdQuery request, CancellationToken cancellationToken)
+		{
+			Task<Contact?> getContactByIdFunc() => unitOfWork.Repository<Contact>().GetByIdAsync(request.Id);
+
+			var contact = await appCache.GetOrAddAsync(
+				$"contact_{request.Id}",
+				async token => await getContactByIdFunc(),
+				absoluteExpireTime: TimeSpan.FromMinutes(2),
+				tags: ["contacts"]
+			);
+
+			var mappedContact = mapper.Map<GetContactByIdResponse>(contact);
+			return await Result<GetContactByIdResponse>.SuccessAsync(mappedContact);
+		}
+	}
+}

Sufi.Demo.PeopleDirectory.Application/Features/Contacts/Queries/GetById/GetContactByIdResponse.cs

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+namespace Sufi.Demo.PeopleDirectory.Application.Features.Contacts.Queries.GetById
+{
+	public record GetContactByIdResponse
+	{
+		public int Id { get; set; }
+		public string UserName { get; set; } = null!;
+		public string Phone { get; set; } = null!;
+		public string Email { get; set; } = null!;
+		public string SkillSets { get; set; } = null!;
+		public string Hobby { get; set; } = null!;
+	}
+}