public async Task ItShouldNotCommitNotificationsIfReceivedAnEmptyCollectionOfNotifications(
INotificationChannel <long> channel,
AbstractMessageProcessor <long> sut)
{
// Arrange
A.CallTo(() => channel.Receive(A <CancellationToken> ._))
.Returns(Enumerable.Empty <INotification <long> >().ToArray());
// Act
await sut.GetMessages(CancellationToken.None);
// Assert
A.CallTo(() => channel.Commit(A <INotification <long>[]> ._, A <NotificationTransaction> ._))
.MustNotHaveHappened();
}
public async Task ItShouldStoreTheExpectedMessagesWhenNoExceptionIsThrown(
[Frozen] IStorageProvider <long> storageProvider,
[Frozen] IStorageMessageSerializer serializer,
CancellationToken cancellation,
NotificationTransaction expectedTransaction,
INotification <long>[] expectedNotifications,
INotificationChannel <long> channel,
AbstractMessageProcessor <long> sut)
{
// Arrange
// Act
await sut.GetMessages(cancellation);
// Assert
A.CallTo(() => storageProvider.Store(serializer, expectedNotifications)).MustHaveHappened(Repeated.Exactly.Once)
.Then(A.CallTo(() => channel.Commit(expectedNotifications, expectedTransaction)).MustHaveHappened(Repeated.Exactly.Once));
}
public async Task ItShouldRollbackTheExpectedMessagesWhenAnExceptionIsThrown(
[Frozen] IStorageProvider <long> storageProvider,
NotificationTransaction expectedTransaction,
INotification <long>[] expectedNotifications,
INotificationChannel <long> channel,
AbstractMessageProcessor <long> sut)
{
// Arrange
A.CallTo(() => storageProvider.Store(
A <IStorageMessageSerializer> ._,
A <INotification <long>[]> ._))
.Throws <Exception>();
// Act
await sut.GetMessages(CancellationToken.None);
// Assert
A.CallTo(() => channel.Commit(A <INotification <long>[]> ._, A <NotificationTransaction> ._)).MustNotHaveHappened();
A.CallTo(() => channel.Rollback(expectedNotifications, expectedTransaction)).MustHaveHappened(Repeated.Exactly.Once);
}
public async Task <MessageEnvelope> GetMessages(CancellationToken cancellation)
{
// very lame representation of what this method could look like
var notifications = await _notificationChannel.Receive(cancellation);
if (!notifications.Any())
{
return(new MessageEnvelope());
}
var transaction = _transactionTracker.CreateTransaction();
try
{
_storageProvider.Store(_messageSerializer, notifications);
_notificationChannel.Commit(notifications, transaction);
return(new MessageEnvelope("Notifications Commited", transaction));
}
catch (Exception ex)
{
_notificationChannel.Rollback(notifications, transaction);
return(new MessageEnvelope(ex.Message, transaction));
}
}