.

wcfs/δtail.go.in

@@ -31,6 +31,10 @@ import (
 //
 //	[](rev↑, []id)
 //
+// and index
+//
+//	{} id -> max(rev: rev changed id)
+//
 // where
 //
 //	rev - is ZODB revision, and
@@ -53,7 +57,7 @@ type ΔTail struct {
 
 	lastRevOf map[ID]zodb.Tid // index for LastRevOf queries
 	// TODO also add either tailv idx <-> rev index, or lastRevOf -> tailv idx
-	// (if linear back-scan of δRevEntry starts eat cpu).
+	// (if linear back-scan of δRevEntry starts to eat cpu).
 }
 
 // δRevEntry represents information of what have been changed in one revision.
@@ -67,6 +71,8 @@ func NewΔTail() *ΔTail {
 	return &ΔTail{lastRevOf: make(map[ID]zodb.Tid)}
 }
 
+// XXX + .Head() -> max(rev)	XXX or 0 if len(tailv) == 0?
+
 // XXX add way to extend coverage without appending changed data? (i.e. if a
 // txn did not change file at all) -> but then it is simply .Append(rev, nil)?