public async Task ShouldReturnNull_IfGetMessagesIsUnsuccessful()
{
//Arrange
var service = SetupService();
_queService.GetMessagesFromQueAsync <RingbaUOW>(Arg.Any <int>(), Arg.Any <int>(), Arg.Any <int>())
.Returns(Task.FromResult(new MessageBatchResult <RingbaUOW>
{
IsSuccessfull = false,
}));
//Act
var result = await service.FetchMessagesAsync();
//Assert
Assert.Equal(null, result);
}
public virtual async Task <MessageBatchResult <RingbaUOW> > FetchMessagesAsync()
{
await LogInfoAsync(
$"ImplementMeService.DoWorkAsync is trying to fetch a new message batch @ {Environment.MachineName}",
"PreFetchMessageBatch");
var batch = await _queService.GetMessagesFromQueAsync <RingbaUOW>(10, 30, 30);
if (!batch.IsSuccessfull)
{
await LogErrorAsync(batch.ErrorCode, batch.ErrorMessage, "FetchMessageBatch");
return(null);
}
await LogInfoAsync(
$"ImplementMeService.DoWorkAsync fetched {batch.NumberOfMessages} @ {Environment.MachineName}",
"FetchMessageBatch");
return(batch);
}
public void DoWork()
{
// Pseudo-code to illustrate a naive implementation. Provide an optimal implementation.
while (true)
{
var batch = _queService.GetMessagesFromQueAsync <RingbaUOW>(10, 30, 30).Result;
foreach (var message in batch.Messages)
{
var result = _processService.ProccessMessageAsync(message.Body).Result;
_queService.UpdateMessagesAsync(new UpdateBatchRequest[]
{
new UpdateBatchRequest
{
Id = message.Id,
MessageCompleted = result.IsSuccessfull
}
});
}
}
}
private async Task <MessageBatchResult <RingbaUOW> > GetMessagesBatch() => await _queService.GetMessagesFromQueAsync <RingbaUOW>(
MaxNumberOfMessages,
EmptyQueWaitTimeInSeconds,
MaxMessageProcessTimeInSeconds);