public LockResourceTracker(RepositoryLookupFailureCallback lookupFailureCallback, ValueNumberDataflow vnaDataflow) {
public LockResourceTracker( RepositoryLookupFailureCallback lookupFailureCallback, CFG cfg, ValueNumberDataflow vnaDataflow, IsNullValueDataflow isNullDataflow) {
		public LockResourceTracker(RepositoryLookupFailureCallback lookupFailureCallback, ValueNumberDataflow vnaDataflow) {			this.lookupFailureCallback = lookupFailureCallback;			this.vnaDataflow = vnaDataflow;		}