.

wcfs/internal/xbtree/δbtail.go

@@ -68,7 +68,8 @@ type Value  = zodb.Oid // XXX assumes key points to IPersistent
 //
 // ΔTail is not safe for concurrent access.	XXX -> is safe to use from multiple goroutines simultaneously.
 type ΔTail struct {
-	δZtail *zodb.ΔTail // raw ZODB changes; Kept to rebuild δBtail/byRoot after new Track
+	// XXX -> δZtail
+	ΔZtail *zodb.ΔTail // raw ZODB changes; Kept to rebuild δBtail/byRoot after new Track
 
 	δroot  []ΔRoots // which BTree were changed; Noted only by keys ∈ tracket subset
 	byRoot map[*Tree]*ΔTreeTail // root -> k/v change history; only for keys ∈ tracket subset
@@ -116,7 +117,7 @@ type ΔTree struct {
 // Initial coverage is (at₀, at₀].
 func NewΔTail(at0 zodb.Tid) *ΔTail {
 	return &ΔTail{
-		δZtail:   zodb.NewΔTail(at0),
+		ΔZtail:   zodb.NewΔTail(at0),
 		trackIdx: make(map[zodb.Oid]SetTree),
 	}
 }
@@ -124,12 +125,12 @@ func NewΔTail(at0 zodb.Tid) *ΔTail {
 // Head is similar to zodb.ΔTail.Head .		XXX ok?
 func (δb *ΔTail) Head() zodb.Tid {
 	//return δb.head
-	return δb.δZtail.Head()
+	return δb.ΔZtail.Head()
 }
 
 // Tail is similar to zodb.ΔTail.Tail .		XXX ok?
 func (δb *ΔTail) Tail() zodb.Tid {
-	return δb.δZtail.Tail()
+	return δb.ΔZtail.Tail()
 }
 
 // XXX SliceByRev?
@@ -178,7 +179,7 @@ func (δb *ΔTail) Track(path []Node) {	// XXX Tree|Bucket; path[0] = root
 //
 // XXX returned [](root, []key) -> move to separate SliceByRev to get diff?
 func (btail *ΔTail) Update(δZ *zodb.EventCommit) []ΔTree {
-	btail.δZtail.Append(δZ.Tid, δZ.Changev)
+	btail.ΔZtail.Append(δZ.Tid, δZ.Changev)
 
 	// {} root -> []oid changed under that root
 	δZByRoot := map[*Tree][]zodb.Oid{}	// XXX -> map[*Tree]SetOid ?
@@ -253,7 +254,7 @@ func (btail *ΔTail) LastRevOf(root *Tree, key Key, at zodb.Tid) (_ zodb.Tid, ex
 }
 
 func (btail *ΔTail) ForgetPast(revCut zodb.Tid) {
-	btail.δZtail.ForgetPast(revCut) // XXX stub
+	btail.ΔZtail.ForgetPast(revCut) // XXX stub
 }
 
 

wcfs/δftail.go

@@ -136,7 +136,7 @@ func (f *BigFile) LastBlkRev(blk int64, at zodb.Tid) (_ zodb.Tid, exact bool) {
 
 	// blktab[blk] was changed to point to a zblk @rev.
 	// blk revision is max rev and when zblk changed last in (rev, at] range.
-	zblkRev, zblkRevExact := δf.ΔTail.δZtail.LastRevOf(zblkOid, at)
+	zblkRev, zblkRevExact := δf.ΔTail.ΔZtail.LastRevOf(zblkOid, at)
 	if zblkRev > tabRev {
 		return zblkRev, zblkRevExact
 	} else {