Domain Command, command

Domain Command, command
I. project files

 

Ii. Code

1     /// <summary>2     /// 3     /// </summary>4     public interface ICommand5     {6     }

 1     /// <summary> 2     ///  3     /// </summary> 4     public interface ICommandResult 5     { 6         bool Success { get; } 7         int? ReturnKey { get; } 8  9         string ReturnKeys { get; }10 11     }

1     /// <summary>2     /// 3     /// </summary>4     /// <typeparam name="TCommand"></typeparam>5     public interface ICommandHandler<in TCommand> where TCommand : ICommand6     {7         ICommandResult Execute(TCommand command);8     }

1     /// <summary>2     /// 3     /// </summary>4     /// <typeparam name="TCommand"></typeparam>5     public interface IValidationHandler<in TCommand> where TCommand : ICommand6     {7         IEnumerable<ValidationResult> Validate(TCommand command);8     }

 1     /// <summary> 2     ///  3     /// </summary> 4     public class CommandResult : ICommandResult 5     { 6         public CommandResult(bool success, int? returnkey = null, string returnKeys = null) 7         { 8             this.Success = success; 9             this.ReturnKey = returnkey;10             this.ReturnKeys = returnKeys;11         }12 13         public bool Success { get; protected set; }14 15         public int? ReturnKey { get; protected set; }16 17         public string ReturnKeys { get; protected set; }18 19     }

 1     /// <summary> 2     ///  3     /// </summary> 4     public class CommandHandlerNotFoundException : Exception 5     { 6         public CommandHandlerNotFoundException(Type type) 7             : base(string.Format("Command handler not found for command type: {0}", type)) 8         { 9         }10     }

 1     /// <summary> 2     ///  3     /// </summary> 4     public class ValidationHandlerNotFoundException : Exception 5     { 6         public ValidationHandlerNotFoundException(Type type) 7             : base(string.Format("Validation handler not found for command type: {0}", type)) 8         { 9         }10     }

1     /// <summary>2     /// 3     /// </summary>4     public interface ICommandBus5     {6         ICommandResult Submit<TCommand>(TCommand command) where TCommand : ICommand;7         IEnumerable<ValidationResult> Validate<TCommand>(TCommand command) where TCommand : ICommand;8     }

 1     /// <summary> 2     ///  3     /// </summary> 4     public class DefaultCommandBus : ICommandBus 5     { 6         public ICommandResult Submit<TCommand>(TCommand command) where TCommand : ICommand 7         { 8             var handler = (ICommandHandler<TCommand>)DependencyDefaultInstanceResolver.GetInstance(typeof(ICommandHandler<TCommand>)); 9             if (!((handler != null) && handler is ICommandHandler<TCommand>))10             {11                 throw new CommandHandlerNotFoundException(typeof(TCommand));12             }   13             return handler.Execute(command);14         }15 16         public IEnumerable<ValidationResult> Validate<TCommand>(TCommand command) where TCommand : ICommand17         {18             var handler = (IValidationHandler<TCommand>)DependencyDefaultInstanceResolver.GetInstance(typeof(IValidationHandler<TCommand>));19             if (!((handler != null) && handler is IValidationHandler<TCommand>))20             {21                 throw new ValidationHandlerNotFoundException(typeof(TCommand));22             }23             return handler.Validate(command);24         }25 26     }

 

 1     /// <summary> 2     /// Describes the result of a validation of a potential change through a business service. 3     /// </summary> 4     public class ValidationResult 5     { 6  7         /// <summary> 8         /// Initializes a new instance of the <see cref="ValidationResult"/> class. 9         /// </summary>10         public ValidationResult()11         {12         }13 14         /// <summary>15         /// Initializes a new instance of the <see cref="ValidationResult"/> class.16         /// </summary>17         /// <param name="memeberName">Name of the memeber.</param>18         /// <param name="message">The message.</param>19         public ValidationResult(string memeberName, string message)20         {21             this.MemberName = memeberName;22             this.Message = message;23         }24 25         /// <summary>26         /// Initializes a new instance of the <see cref="ValidationResult"/> class.27         /// </summary>28         /// <param name="message">The message.</param>29         public ValidationResult(string message)30         {31             this.Message = message;32         }33 34         /// <summary>35         /// Gets or sets the name of the member.36         /// </summary>37         /// <value>38         /// The name of the member.  May be null for general validation issues.39         /// </value>40         public string MemberName { get; set; }41 42         /// <summary>43         /// Gets or sets the message.44         /// </summary>45         /// <value>46         /// The message.47         /// </value>48         public string Message { get; set; }49 50     }

 

Iii. Example

Register

1             builder.RegisterType<DefaultCommandBus>().As<ICommandBus>().InstancePerLifetimeScope();2 3             var domainCommands = Assembly.Load("Frozen.DomainCommands");4             builder.RegisterAssemblyTypes(domainCommands)5                 .AsClosedTypesOf(typeof(ICommandHandler<>)).InstancePerLifetimeScope();6             builder.RegisterAssemblyTypes(domainCommands)7                 .AsClosedTypesOf(typeof(IValidationHandler<>)).InstancePerLifetimeScope();

Define Command

1 /// <summary> 2 // Command to delete student 3 /// </summary> 4 public class DeleteStudentCommand: ICommand 5 {6 /// <summary> 7 // student Id 8 /// </summary> 9 public int StuId {get; set;} 10 11}

Define Handler

 1     /// <summary> 2     ///  3     /// </summary> 4     public class DeleteStudentHandler : ICommandHandler<DeleteStudentCommand> 5     { 6         private readonly IStuEducationRepo _iStuEducationRepo; 7  8         public DeleteStudentHandler(IStuEducationRepo iStuEducationRepo) 9         {10             this._iStuEducationRepo = iStuEducationRepo;11         }12 13         public ICommandResult Execute(DeleteStudentCommand command)14         {15 16 17             return new CommandResult(true);18         }19 20     }

Call

1             var command = new DeleteStudentCommand()2             {3                 StuId = 14             };5             var result = _commandBus.Submit(command);

Result:

 

Packaged as attachment

Http://files.cnblogs.com/files/frozenzhang/Frozen.DomainCommands.zip