Lab4/library/Services/UserService.cs - master - egopen/Lab1

Lab4/library/Services/UserService.cs
73 строки2 KB
Egopen
lab 4
01 ноя 2025, 18:03
01 ноя 2025, 18:0378d017c
namespace library.Services
{
    using global::library.DB.Models;
    using global::library.DB;
    using global::library.Errors;
    using Microsoft.EntityFrameworkCore;
    using Microsoft.Extensions.Caching.Memory;

    namespace library.Services
    {
        public class UserService
        {
            private readonly LibraryDBContext _db;
            private readonly IMemoryCache _memoryCache;

            public UserService(LibraryDBContext db, IMemoryCache memoryCache)
            {
                _db = db;
                _memoryCache = memoryCache;
            }

            public async Task<User> GetUserById(Guid userId)
            {
                var user = await _db.Users
                    .AsNoTracking()
                    .FirstOrDefaultAsync(u => u.Id == userId);

                if (user == null)
                {
                    throw new NotFoundException("User not found");
                }

                return user;
            }

            public async Task<List<User>> GetAllUsers(int page = 1, int pageSize = 20)
            {
                var cacheKey = $"all_users_page_{page}_size_{pageSize}";

                if (_memoryCache.TryGetValue(cacheKey, out List<User> cachedUsers))
                {
                    return cachedUsers;
                }

                var users = await _db.Users
                    .AsNoTracking()
                    .OrderBy(u => u.Name)
                    .Skip((page - 1) * pageSize)
                    .Take(pageSize)
                    .ToListAsync();

                _memoryCache.Set(cacheKey, users, TimeSpan.FromMinutes(5));
                return users;
            }


            public async Task<bool> DeleteUser(Guid userId)
            {
                var user = await _db.Users.FirstOrDefaultAsync(u => u.Id == userId);

                if (user == null)
                {
                    return false;
                }

                _db.Users.Remove(user);
                await _db.SaveChangesAsync();
                return true;
            }

        }
    }
}