public Result <SaveBookCommandResult, SaveBookCommandError> SaveBook(SaveBookCommand command)
{
Result <SaveBookCommandResult, SaveBookCommandError> _cmdResult;
try // try dispatch of the command
{
_cmdResult =
_CommandDispatcher.Dispatch <SaveBookCommandResult, SaveBookCommandError>(_Context, command); //handle the request
}
catch (Exception _exception) // catch every exception
{
string errorMsg = $"Error in {this.GetType()} commandHandler. Message: {_exception.Message} \n Stacktrace: {_exception.StackTrace}";
_Log.ErrorFormat(errorMsg);
return(Result.Fail <SaveBookCommandResult, SaveBookCommandError>(SaveBookCommandError.Set_InternalServerError(errorMsg))); // return internal server error
}
finally
{
// do nothing
}
//SaveBookCommandHandler handler = new SaveBookCommandHandler();
//return handler.Handle(_Context, cmd);
return(_cmdResult);
}
public void CommandHandler_Exception_Test()
{
#region preparation
ApplicationContext _Context = new ApplicationContext();
string errorType = SaveBookCommandError.Set_InternalServerError("").ErrorType;
string errorDetail_part = "Object reference not set to an instance of an object";
#endregion
#region test error
Result <SaveBookCommandResult, SaveBookCommandError> result =
new SaveBookCommandHandler(_Context).Handle(null);
Assert.AreEqual(errorType, result.Error.ErrorType);
Assert.IsTrue(result.Error.ErrorDetail.Contains(errorDetail_part));
#endregion
}
public void CommandHandler_InterceptCommandExecuted2Times_Test()
{
#region preparation
ApplicationContext _Context = new ApplicationContext();
string errorType = SaveBookCommandError.Set_InternalServerError("").ErrorType;
string errorDetail_part = "command already processed";
#endregion
#region test error
SaveBookCommand command = new SaveBookCommand("titolo1", true); // command to execute 2 times
Result <SaveBookCommandResult, SaveBookCommandError> result =
new SaveBookCommandHandler(_Context).Handle(command); // first execution, success
Assert.IsTrue(result.IsSuccess);
result = new SaveBookCommandHandler(_Context).Handle(command); // second execution, failure
Assert.AreEqual(errorType, result.Error.ErrorType);
Assert.IsTrue(result.Error.ErrorDetail.Contains(errorDetail_part));
#endregion
}
