public async Task <TSagaData> Get <TSagaData>(Guid sagaId, SynchronizedStorageSession session, ContextBag context) where TSagaData : IContainSagaData
{
var operations = new SagaPersisterAtomicOperations(session);
var incomingMessage = context.Get <IncomingMessage>();
var messageId = incomingMessage.MessageId;
var indexStream = BuildSagaByIdStreamName(typeof(TSagaData), sagaId);
var slice = await session.ReadStreamEventsBackwardAsync(indexStream, -1, 1, true).ConfigureAwait(false);
if (slice.Status != SliceReadStatus.Success)
{
return(default(TSagaData));
}
if (slice.Events[0].Event.EventType != SagaIndexEventType)
{
return(await operations.ReadSagaData <TSagaData>(indexStream, slice.Events[0], messageId));
}
var indexEntry = slice.Events[0].Event.Data.ParseJson <SagaIndexEvent>();
var dataStream = indexEntry.DataStreamName;
slice = await session.ReadStreamEventsBackwardAsync(dataStream, -1, 1, true).ConfigureAwait(false);
if (slice.Status != SliceReadStatus.Success)
{
return(default(TSagaData));
}
var sagaData = await operations.ReadSagaData <TSagaData>(dataStream, slice.Events[0], messageId);
// ReSharper disable once CompareNonConstrainedGenericWithNull
if (sagaData != null)
{
return(sagaData);
}
throw new Exception($"Either the saga has not yet been created successfully or saga ID {sagaId} has been sent out in a ghost message.");
}
public Task Save(IContainSagaData sagaData, SagaCorrelationProperty correlationProperty, SynchronizedStorageSession session, ContextBag context)
{
var operations = new SagaPersisterAtomicOperations(session);
return(correlationProperty != null
? SaveSagaWithCorrelationProperty(sagaData, correlationProperty, operations, session)
: SaveSagaWithoutCorrelationProperty(sagaData, session));
}
public async Task <TSagaData> Get <TSagaData>(string propertyName, object propertyValue, SynchronizedStorageSession session, ContextBag context) where TSagaData : IContainSagaData
{
var operations = new SagaPersisterAtomicOperations(session);
var incomingMessage = context.Get <IncomingMessage>();
var messageId = incomingMessage.MessageId;
var streamName = BuildSagaDataStreamName(typeof(TSagaData), propertyValue);
var slice = await session.ReadStreamEventsBackwardAsync(streamName, -1, 1, true).ConfigureAwait(false);
if (slice.Status != SliceReadStatus.Success)
{
return(default(TSagaData));
}
return(await operations.ReadSagaData <TSagaData>(streamName, slice.Events[0], messageId));
}
public Task Update(IContainSagaData sagaData, SynchronizedStorageSession session, ContextBag context)
{
var operations = new SagaPersisterAtomicOperations(session);
var versionInfo = operations.GetSagaVersion(sagaData.Id);
var dataStream = versionInfo.StreamName;
var stateChangeEvent = new EventData(Guid.NewGuid(), SagaDataEventType, true, sagaData.ToJsonBytes(), new byte[0]);
if (session.SupportsOutbox())
{
return(session.AppendViaOutbox(dataStream, versionInfo.Version, stateChangeEvent));
}
return(session.AppendToStreamAsync(dataStream, versionInfo.Version, stateChangeEvent));
}
static async Task SaveSagaWithCorrelationProperty(IContainSagaData sagaData, SagaCorrelationProperty correlationProperty, SagaPersisterAtomicOperations operations, SynchronizedStorageSession session)
{
var propertyValue = correlationProperty.Value;
var indexStream = BuildSagaByIdStreamName(sagaData.GetType(), sagaData.Id);
var dataStream = BuildSagaDataStreamName(sagaData.GetType(), propertyValue);
var stateChangeEvent = new EventData(Guid.NewGuid(), SagaDataEventType, true, sagaData.ToJsonBytes(), new byte[0]);
await operations.CreateIndex(indexStream, dataStream).ConfigureAwait(false);
await session.AppendToStreamAsync(dataStream, ExpectedVersion.NoStream, stateChangeEvent).ConfigureAwait(false);
}
