private TCommandResult InternalExecute <TCommand, TCommandResult>(TCommand command)
where TCommand : ICommand <TCommandResult>
where TCommandResult : CommandResult, new()
{
var result = CreateDefaultCommandResult <TCommand, TCommandResult>(command);
var handler = _commandHandlerProvider.GetCommandHandler <TCommand, TCommandResult>();
if (handler != null)
{
var hasTransactionAttribute = handler.HasTransactionAttribute();
if (hasTransactionAttribute)
{
_dbSessionManager.OpenTransaction();
}
try
{
var checkResult = _prerequisitesChecker.Check(command);
if (!checkResult.ContainsError)
{
result = handler.Handle(command);
}
else
{
result.Message = checkResult.Message;
}
if (hasTransactionAttribute)
{
_dbSessionManager.CommitTransaction();
}
}
catch (Exception)
{
if (hasTransactionAttribute)
{
_dbSessionManager.RollbackTransaction();
}
throw;
}
}
return(result);
}
public TViewModel GetViewModel()
{
var args = _argumentsProvider.GetArguments<TArg>();
var checkResult = _prerequisitesChecker.Check( args );
if ( checkResult.ContainsError )
throw new ArgumentException( checkResult.Message );
return _viewModelProvider.GetViewModel( args );
}
public CommandResult Execute <TCommand>(TCommand command)
{
var result = new CommandResult
{
ContainsError = true,
Message = String.Format("Handler not found for command {0}", command.GetType().Name)
};
var handler = _commandHandlerProvider.GetCommandHandler <TCommand>();
if (handler != null)
{
var hasTransactionAttribute = handler.HasTransactionAttribute();
if (hasTransactionAttribute)
{
_dbSessionManager.OpenTransaction();
}
try
{
var checkResult = _prerequisitesChecker.Check(command);
if (!checkResult.ContainsError)
{
result = handler.Handle(command);
}
else
{
result.Message = checkResult.Message;
}
if (hasTransactionAttribute)
{
_dbSessionManager.CommitTransaction();
}
}
catch (Exception)
{
if (hasTransactionAttribute)
{
_dbSessionManager.RollbackTransaction();
}
throw;
}
}
return(result);
}