/// <summary>
/// 处理幂等命令
/// </summary>
/// <param name="message">幂等命令</param>
/// <returns></returns>
public async Task <TResult> Handle(IdentifiedCommand <TCommand, TResult> identifiedCommand)
{
var alreadyExists = await _requestManager.ExistAsync(identifiedCommand.Id);
if (alreadyExists)
{
return(this.CreateResultForDuplicateRequest());
}
else
{
await _requestManager.CreateRequestForCommandAsync <TCommand>(identifiedCommand.Id);
var result = await this._mediator.Send(identifiedCommand.Command);
return(result);
}
}
/// <summary>
/// This method handles the command. It just ensures that no other request exists with the same ID, and if this is the case
/// just enqueues the original inner command.
/// </summary>
/// <param name="message">IdentifiedCommand which contains both original command & request ID</param>
/// <returns>Return value of inner command or default value if request same ID was found</returns>
public async Task <R> Handle(IdentifiedCommand <T, R> message, CancellationToken cancellationToken)
{
var alreadyExists = await _requestManager.ExistAsync(message.Id);
if (alreadyExists)
{
return(CreateResultForDuplicateRequest());
}
await _requestManager.CreateRequestForCommandAsync <T>(message.Id);
try
{
// Send the embeded business command to mediator so it runs its related CommandHandler
var result = await _mediator.Send(message.Command);
return(result);
}
catch
{
return(default(R));
}
}
/// <summary>
/// This method handles the command. It just ensures that no other request exists with the same ID, and if this is the case
/// just enqueues the original inner command.
/// </summary>
/// <param name="message">IdentifiedCommand which contains both original command & request ID</param>
/// <returns>Return value of inner command or default value if request same ID was found</returns>
public async Task <R> Handle(IdentifiedCommand <T, R> message, CancellationToken cancellationToken)
{
var alreadyExists = await _requestManager.ExistAsync(message.Id);
if (alreadyExists)
{
return(CreateResultForDuplicateRequest());
}
else
{
await _requestManager.CreateRequestForCommandAsync <T>(message.Id);
try
{
var command = message.Command;
var commandName = command.GetGenericTypeName();
var idProperty = string.Empty;
var commandId = string.Empty;
switch (command)
{
case CreateOrderCommand createOrderCommand:
idProperty = nameof(createOrderCommand.UserId);
commandId = createOrderCommand.UserId;
break;
case CancelOrderCommand cancelOrderCommand:
idProperty = nameof(cancelOrderCommand.OrderNumber);
commandId = $"{cancelOrderCommand.OrderNumber}";
break;
case ShipOrderCommand shipOrderCommand:
idProperty = nameof(shipOrderCommand.OrderNumber);
commandId = $"{shipOrderCommand.OrderNumber}";
break;
default:
idProperty = "Id?";
commandId = "n/a";
break;
}
_logger.LogInformation(
"----- Sending command: {CommandName} - {IdProperty}: {CommandId} ({@Command})",
commandName,
idProperty,
commandId,
command);
// Send the embeded business command to mediator so it runs its related CommandHandler
var result = await _mediator.Send(command, cancellationToken);
_logger.LogInformation(
"----- Command result: {@Result} - {CommandName} - {IdProperty}: {CommandId} ({@Command})",
result,
commandName,
idProperty,
commandId,
command);
return(result);
}
catch
{
return(default(R));
}
}
}
