public static bool IsStreamDeletedEvent(
string streamOrMetaStreamId, string eventType, string eventData, out string deletedPartitionStreamId)
{
if (string.IsNullOrEmpty(streamOrMetaStreamId))
{
deletedPartitionStreamId = null;
return(false);
}
bool isMetaStream;
if (SystemStreams.IsMetastream(streamOrMetaStreamId))
{
isMetaStream = true;
deletedPartitionStreamId = streamOrMetaStreamId.Substring("$$".Length);
}
else
{
isMetaStream = false;
deletedPartitionStreamId = streamOrMetaStreamId;
}
var isStreamDeletedEvent = false;
if (isMetaStream)
{
if (eventType == SystemEventTypes.StreamMetadata)
{
var metadata = StreamMetadata.FromJson(eventData);
//NOTE: we do not ignore JSON deserialization exceptions here assuming that metadata stream events must be deserializable
if (metadata.TruncateBefore == EventNumber.DeletedStream)
{
isStreamDeletedEvent = true;
}
}
}
else
{
if (eventType == SystemEventTypes.StreamDeleted)
{
isStreamDeletedEvent = true;
}
}
return(isStreamDeletedEvent);
}
