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POFactories, services, repository in DDD
 

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    <p>I have some questions regarding <strong>factories</strong>, <strong>repositories</strong> and <strong>services</strong> in <strong>DDD</strong>. I have the following entities: Folder, file, FileData.</p> <p>In my opinion the "Folder" is an <strong>aggregate root</strong> and should have the responsibility of creating the File and FileData object. </p> <p>So my first question is should I use a <strong>factory</strong> to create this aggreate or is it up to the <strong>repository</strong>? At this time I have 2 repositories, one for Folder and another for File, but it seems to me I should merge them together. The following code snippet, shows my <strong>Folder Repository</strong>, which is located in my infrastructure layer: </p> <pre><code>public class FolderRepository : IFolderRepository { #region Fields private readonly IFolderContext _context; private readonly IUnitOfWork _unitOfWork; #endregion #region Constructor public FolderRepository(IUnitOfWork unitOfWork) { _unitOfWork = unitOfWork; _context = _unitOfWork.Context as IFolderContext; } #endregion public IUnitOfWork UnitOfWork { get { return _unitOfWork; } } public IQueryable&lt;Folder&gt; All { get { return _context.Folders; } } public Folder Find(Guid id) { return _context.Folders.Find(id); } public void InsertGraph(Folder entity) { _context.Folders.Add(entity); } public void InsertOrUpdate(Folder entity) { if (entity.Id == Guid.Empty) { _context.SetAdd(entity); } else { _context.SetModified(entity); } } public bool Delete(Guid id) { var folder = this.Find(id) ?? _context.Folders.Find(id); _context.Folders.Remove(folder); return folder == null; } public int AmountOfFilesIncluded(Folder folder) { throw new NotImplementedException(); //return folder.Files.Count(); } public void Dispose() { _context.Dispose(); } } </code></pre> <p>Next I have created a service in my <strong>application layer</strong>, this is called "IoService". I have my doubts about the location of the service. Should it be moved to the <strong>domain layer</strong>?</p> <pre><code>public class IoService : IIoService { #region Fields private readonly IFolderRepository _folderRepository; private readonly IFileRepository _fileRepository; private readonly IUserReferenceRepository _userReferenceRepository; #endregion #region Constructor public IoService(IFolderRepository folderRepository, IFileRepository fileRepository, IUserReferenceRepository userReferenceRepository) { if(folderRepository == null) throw new NullReferenceException("folderRepository"); if(fileRepository == null) throw new NullReferenceException("fileRepository"); if (userReferenceRepository == null) throw new NullReferenceException("userReferenceRepository"); _folderRepository = folderRepository; _fileRepository = fileRepository; _userReferenceRepository = userReferenceRepository; } #endregion #region Folder Methods /// &lt;summary&gt; /// Create a new 'Folder' /// &lt;/summary&gt; /// &lt;param name="userReference"&gt;&lt;/param&gt; /// &lt;param name="name"&gt;&lt;/param&gt; /// &lt;param name="parentFolder"&gt;&lt;/param&gt; /// &lt;param name="userIds"&gt;The given users represent who have access to the folder&lt;/param&gt; /// &lt;param name="keywords"&gt;&lt;/param&gt; /// &lt;param name="share"&gt;&lt;/param&gt; public void AddFolder(UserReference userReference, string name, Folder parentFolder = null, IList&lt;Guid&gt; userIds = null, IEnumerable&lt;string&gt; keywords = null, bool share = false) { var userReferenceList = new List&lt;UserReference&gt; { userReference }; if (userIds != null &amp;&amp; userIds.Any()) { userReferenceList.AddRange(userIds.Select(id =&gt; _userReferenceRepository.Find(id))); } var folder = new Folder { Name = name, ParentFolder = parentFolder, Shared = share, Deleted = false, CreatedBy = userReference, UserReferences = userReferenceList }; if (keywords != null) { folder.Keywords = keywords.Select(keyword =&gt; new Keyword { Folder = folder, Type = "web", Value = keyword, }).ToList(); } //insert into repository _folderRepository.InsertOrUpdate(folder); //save _folderRepository.UnitOfWork.Save(); } /// &lt;summary&gt; /// Get 'Folder' by it's id /// &lt;/summary&gt; /// &lt;param name="id"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public Folder GetFolder(Guid id) { return _folderRepository.Find(id); } #endregion #region File Methods /// &lt;summary&gt; /// Add a new 'File' /// &lt;/summary&gt; /// &lt;param name="userReference"&gt;&lt;/param&gt; /// &lt;param name="folder"&gt;&lt;/param&gt; /// &lt;param name="data"&gt;&lt;/param&gt; /// &lt;param name="name"&gt;&lt;/param&gt; /// &lt;param name="title"&gt;&lt;/param&gt; /// &lt;param name="keywords"&gt;&lt;/param&gt; /// &lt;param name="shared"&gt;&lt;/param&gt; public void AddFile(UserReference userReference, Folder folder, FileData data, string name, string title = "", IEnumerable&lt;string&gt; keywords = null, bool shared = false) { var file = new File { Name = name, Folder = folder, FileData = data, CreatedBy = userReference, Type = data.Type }; if (keywords != null) { file.Keywords = keywords.Select(keyword =&gt; new Keyword { File = file, Type = "web", Value = keyword, }).ToList(); } folder.Files.Add(file); folder.Updated = DateTime.UtcNow; _folderRepository.InsertOrUpdate(folder); //save _folderRepository.UnitOfWork.Save(); } /// &lt;summary&gt; /// Get 'File' by it's id /// &lt;/summary&gt; /// &lt;param name="id"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public File GetFile(Guid id) { return _fileRepository.Find(id); } #endregion } </code></pre> <p>To summarize: Should I use the service for creating the folder object. Or should the service just use a <strong>factory</strong>, which have the responsibility of creating the object and send the created object to the <strong>repository</strong>? What about <strong>dependency injection</strong> in the service, should I inject my services from the UI layer with IOC containers like <strong>Unity</strong> or should I just hardcode the dependencies in the service?</p> <p>Thanks</p>
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