組合存盤庫邏輯的最佳方法

假設我有 2 個repositories：

• first 負責創造就業和回報 jobId
• 第二個負責創建日志并jobId作為引數

我的目標是：

• 保存Job并Log同時
• 防止出現錯誤時只Job保存的情況Log

獲得預期結果的最推薦方法是什么？

我準備了 3 個我想到的案例，但如果您看到更好的選擇，請分享。

• 選項 1（獲取結果并將更改保存在控制器中）

public class JobRepository : IJobRepository
{
    private readonly Context _context;
    
    public JobRepository(Context context)
    {
        _context = context;
    }

    public Guid CreateJob()
    {
        var job = new Job { Id = Guid.NewGuid() };
        _context.Jobs.Add(job);
        return job.Id;
    }
}
// ...
public class LogRepository : ILogRepository
{
    private readonly Context _context;
    
    public LogRepository(Context context)
    {
        _context = context;
    }

    public void CreateLog(Guid id)
    {
        var log = new Log { Jobid = id };
        _context.Logs.Add(log);
    }
}
// ...
public class JobsController : Controller
{
    private readonly Context _context;
    private readonly IJobRepository _jobRepository;
    private readonly ILogRepository _logRepository;

    public JobsController(Context context, JobRepository jobRepository, ILogRepository logRepository)
    {
        _context = context;
        _jobRepository = jobRepository;
        _logRepository = logRepository
    }

    [HttpGet]
    public IActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public IActionResult Create()
    {
        var id = _jobRepository.CreateJob();
        _logRepository.CreateLog(id);
        _context.SaveChanges();
        return RedirectToAction("Index");
    }
}

• 選項 2（將一個存盤庫注入另一個存盤庫）

public class JobRepository : IJobRepository
{
    private readonly Context _context;
    private readonly ILogRepository _logRepository;
    
    public JobRepository(Context context, ILogRepository logRepository)
    {
        _context = context;
    }

    public void CreateJob()
    {
        var job = new Job { Id = Guid.NewGuid() };
        _context.Jobs.Add(job);
        _logRepository.CreateLog(job.Id);
        _context.SaveChanges();
    }
}
// ...
public class LogRepository : ILogRepository
{
    private readonly Context _context;
    
    public LogRepository(Context context)
    {
        _context = context;
    }

    public void CreateLog(Guid id)
    {
        var log = new Log { Jobid = id };
        _context.Logs.Add(log);
    }
}
// ...
public class JobsController : Controller
{
    private readonly IJobRepository _jobRepository;

    public JobsController(JobRepository jobRepository)
    {
        _jobRepository = jobRepository;
    }

    [HttpGet]
    public IActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public IActionResult Create()
    {
         _jobRepository.CreateJob();
        return RedirectToAction("Index");
    }
}

• 選項 3（不要在控制器中使用背景關系，而是Save在每個 repo 中宣告方法）

public class JobRepository : IJobRepository
{
    private readonly Context _context;
    
    public JobRepository(Context context)
    {
        _context = context;
    }

    public Guid CreateJob()
    {
        var job = new Job { Id = Guid.NewGuid() };
        _context.Jobs.Add(job);
        return job.Id;
    }

    public void Save()
    {
        _context.SaveChanges();
    }
}
// ...
public class LogRepository : ILogRepository
{
    private readonly Context _context;
    
    public LogRepository(Context context)
    {
        _context = context;
    }

    public void CreateLog(Guid id)
    {
        var log = new Log { Jobid = id };
        _context.Logs.Add(log);
    }

    public void Save()
    {
        _context.SaveChanges();
    }
}
// ...
public class JobsController : Controller
{
    private readonly IJobRepository _jobRepository;
    private readonly ILogRepository _logRepository;

    public JobsController(JobRepository jobRepository, ILogRepository logRepository)
    {
        _jobRepository = jobRepository;
        _logRepository = logRepository
    }

    [HttpGet]
    public IActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public IActionResult Create()
    {
        var id = _jobRepository.CreateJob();
        _logRepository.CreateLog(id);
        return RedirectToAction("Index");
    }
}

uj5u.com熱心網友回復：

由于用例表明操作（保存和日志記錄）應該作為單個作業單元發生。

我會建議一種類似于第三種的方法。但不是直接將兩個存盤庫注入控制器。我們可以創建一個服務，然后使用存盤庫。

在這里我們可以創建一個服務如下：

    public class JobService : IJobService
    {
        private readonly IJobRepository _jobRepo;
        private readonly ILogRepository _logRepo;

        public JobRepository(IJobRepository jobRepo, ILogRepository logRepo)
        {
            _jobRepo = jobRepo;
            _logRepo = logRepo;
        }

        public void CreateJob()
        {
            var id = _jobRepo.CreateJob();
            _logRepo.CreateLog(id);
        }
    }

    public class JobsController : Controller
    {
        private readonly IJobService _jobService;

        public JobsController(IJobService jobService)
        {
            _jobService = jobService;
        }

        [HttpGet]
        public IActionResult Create()
        {
            return View();
        }

        [HttpPost]
        public IActionResult Create()
        {
            _jobService.CreateJob();
            return RedirectToAction("Index");
        }
    }

補充閱讀：存盤庫服務模式

標籤：C＃ 。网 asp.net-mvc

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