public static bool GetOrReserveEventType <TStreamId>(
this INameIndex <TStreamId> eventTypeIndex,
IRecordFactory <TStreamId> recordFactory,
string eventType,
long logPosition,
out TStreamId eventTypeId,
out IPrepareLogRecord <TStreamId> eventTypeRecord)
{
var preExisting = eventTypeIndex.GetOrReserve(eventType, out eventTypeId, out var addedNumber, out var addedName);
var appendNewEventType = recordFactory.ExplicitEventTypeCreation && !preExisting;
if (!appendNewEventType)
{
eventTypeRecord = null;
return(preExisting);
}
eventTypeRecord = recordFactory.CreateEventTypeRecord(
eventTypeId: Guid.NewGuid(),
parentEventTypeId: Guid.Empty,
eventType: addedName,
eventTypeNumber: addedNumber,
eventTypeVersion: 0,
logPosition: logPosition,
timeStamp: DateTime.UtcNow);
return(preExisting);
}
// todo: rename to GetOrReserveStream when we generalise to EventTypes too.
/// Generates a StreamRecord if necessary
public static bool GetOrReserve <TStreamId>(
this INameIndex <TStreamId> streamNameIndex,
IRecordFactory <TStreamId> recordFactory,
string streamName,
long logPosition,
out TStreamId streamId,
out IPrepareLogRecord <TStreamId> streamRecord)
{
var preExisting = streamNameIndex.GetOrReserve(streamName, out streamId, out var addedId, out var addedName);
var appendNewStream = recordFactory.ExplicitStreamCreation && !preExisting;
if (!appendNewStream)
{
streamRecord = null;
return(preExisting);
}
streamRecord = recordFactory.CreateStreamRecord(
streamId: Guid.NewGuid(),
logPosition: logPosition,
timeStamp: DateTime.UtcNow,
streamNumber: addedId,
streamName: addedName);
return(preExisting);
}
private TStreamId GetEpochInformationEventType()
{
if (!_eventTypeIndex.GetOrReserve(SystemEventTypes.EpochInformation, out var eventTypeId, out _, out _))
{
throw new Exception($"{SystemEventTypes.EpochInformation} event type does not exist");
}
return(eventTypeId);
}
private TStreamId GetEpochInformationStream()
{
if (!_streamNameIndex.GetOrReserve(SystemStreams.EpochInformationStream, out var streamId, out _, out _))
{
throw new Exception($"{SystemStreams.EpochInformationStream} stream does not exist");
}
return(streamId);
}
protected void GetOrReserve(string eventStreamName, out TStreamId eventStreamId, out long newPos)
{
newPos = WriterCheckpoint.ReadNonFlushed();
_streamNameIndex.GetOrReserve(_logFormat.RecordFactory, eventStreamName, newPos, out eventStreamId, out var streamRecord);
if (streamRecord != null)
{
Writer.Write(streamRecord, out newPos);
}
}
public bool GetOrReserve(string eventType, out uint eventTypeId, out uint createdId, out string createdName)
{
Ensure.NotNull(eventType, "eventType");
if (LogV3SystemEventTypes.TryGetSystemEventTypeId(eventType, out eventTypeId))
{
createdId = default;
createdName = default;
return(true);
}
return(_wrapped.GetOrReserve(eventType, out eventTypeId, out createdId, out createdName));
}
public bool GetOrReserve(string streamName, out StreamId streamId, out StreamId createdId, out string createdName)
{
Ensure.NotNullOrEmpty(streamName, "streamName");
if (SystemStreams.IsMetastream(streamName))
{
streamName = SystemStreams.OriginalStreamOf(streamName);
var ret = GetOrReserve(streamName, out streamId, out createdId, out createdName);
streamId = _metastreams.MetaStreamOf(streamId);
return(ret);
}
if (LogV3SystemStreams.TryGetVirtualStreamId(streamName, out streamId))
{
createdId = default;
createdName = default;
return(true);
}
return(_wrapped.GetOrReserve(streamName, out streamId, out createdId, out createdName));
}