public async Task Save_fails_when_data_changes_between_read_and_update()
{
var sagaId = Guid.NewGuid();
var saga = new TestSagaData
{
Id = sagaId,
SomeId = sagaId.ToString()
};
var persister = new NonDurableSagaPersister();
var insertSession = new NonDurableSynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata <TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var winningContext = new ContextBag();
var losingContext = new ContextBag();
var returnedSaga1 = await Task.Run(() =>
persister.Get <TestSagaData>(saga.Id, new NonDurableSynchronizedStorageSession(), winningContext));
var returnedSaga2 = await persister.Get <TestSagaData>("SomeId", sagaId.ToString(),
new NonDurableSynchronizedStorageSession(), losingContext);
var winningSaveSession = new NonDurableSynchronizedStorageSession();
var losingSaveSession = new NonDurableSynchronizedStorageSession();
await persister.Update(returnedSaga1, winningSaveSession, winningContext);
await persister.Update(returnedSaga2, losingSaveSession, losingContext);
await winningSaveSession.CompleteAsync();
Assert.That(async() => await losingSaveSession.CompleteAsync(),
Throws.InstanceOf <Exception>().And.Message
.StartsWith(
$"NonDurableSagaPersister concurrency violation: saga entity Id[{saga.Id}] already saved."));
}
public async Task Persister_returns_different_instance_of_saga_data()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new NonDurableSagaPersister();
var insertSession = new NonDurableSynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata <TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var returnedSaga1 =
await persister.Get <TestSagaData>(saga.Id, new NonDurableSynchronizedStorageSession(), new ContextBag());
var returnedSaga2 = await persister.Get <TestSagaData>("Id", saga.Id,
new NonDurableSynchronizedStorageSession(), new ContextBag());
Assert.AreNotSame(returnedSaga2, returnedSaga1);
Assert.AreNotSame(returnedSaga1, saga);
Assert.AreNotSame(returnedSaga2, saga);
}