// in v2 this checks if the first character is '$'
// system streams can be created dynamically at runtime
// e.g. "$persistentsubscription-" + _eventStreamId + "::" + _groupName + "-parked"
// so we can either allocate a range of numbers (how many?) for them, or look up the name and see if it begins with $.
// for now do the latter because (1) allocating a range of numbers will probably get fiddly
// and (2) i expect we will find that at the point we are trying to determine if a stream is a system stream then
// we will have already looked up its info in the stream index, so this call will become trivial or unnecessary.
public bool IsSystemStream(long streamId)
{
if (IsVirtualStream(streamId) ||
_metastreams.IsMetaStream(streamId))
{
return(true);
}
var streamName = _streamNames.LookupName(streamId);
return(SystemStreams.IsSystemStream(streamName));
}
public long GetStreamLastEventNumber(TStreamId streamId)
{
if (_metastreams.IsMetaStream(streamId))
{
return(GetStreamLastEventNumber(_metastreams.OriginalStreamOf(streamId)));
}
return(_isStreamDeleted(streamId) ? EventNumber.DeletedStream : 1000000);
}
// in v2 this checks if the first character is '$'
// system streams can be created dynamically at runtime
// e.g. "$persistentsubscription-" + _eventStreamId + "::" + _groupName + "-parked"
// so we can either allocate a range of numbers (how many?) for them, or look up the name and see if it begins with $.
// for now do the latter because (1) allocating a range of numbers will probably get fiddly
// and (2) i expect we will find that at the point we are trying to determine if a stream is a system stream then
// we will have already looked up its info in the stream index, so this call will become trivial or unnecessary.
public bool IsSystemStream(StreamId streamId)
{
if (IsVirtualStream(streamId) ||
_metastreams.IsMetaStream(streamId) ||
streamId == NoSystemStream)
{
return(true);
}
if (streamId == NoUserStream)
{
return(false);
}
var streamName = _streamNames.LookupName(streamId);
return(SystemStreams.IsSystemStream(streamName));
}
public string LookupName(long streamId)
{
string name;
if (_metastreams.IsMetaStream(streamId))
{
streamId = _metastreams.OriginalStreamOf(streamId);
name = LookupName(streamId);
name = SystemStreams.MetastreamOf(name);
return(name);
}
if (LogV3SystemStreams.TryGetVirtualStreamName(streamId, out name))
{
return(name);
}
name = _wrapped.LookupName(streamId);
return(name);
}
public bool TryGetName(StreamId streamId, out string name)
{
if (_metastreams.IsMetaStream(streamId))
{
streamId = _metastreams.OriginalStreamOf(streamId);
if (!TryGetName(streamId, out name))
{
return(false);
}
name = SystemStreams.MetastreamOf(name);
return(true);
}
if (LogV3SystemStreams.TryGetVirtualStreamName(streamId, out name))
{
return(true);
}
return(_wrapped.TryGetName(streamId, out name));
}