.

wcfs/internal/xbtree/δbtail.go

@@ -83,7 +83,7 @@ type ΔTail struct {
 	// 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
+	δRtail []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
 
 	// XXX or ask client provide db on every call?
@@ -102,21 +102,17 @@ type Δ struct {
 	Change	map[*Tree]map[Key]Value // {} root -> {}(key, value)
 }
 
-
-/*
 // ΔRoots describes which BTrees were change in one revision.
-// XXX kill?
 type ΔRoots struct {
 	Rev     zodb.Tid
 	Changev []*Tree	// root XXX -> Oid?	XXX -> SetTree?
 }
-*/
 
 // ΔTreeTail represent tail of revisional changes to one BTree.
 //
 // See ΔTail documentation for details.
 type ΔTreeTail struct {
-	δTtail []ΔTree // changes to tree keys; rev↑. covers keys ∈ tracket subset
+	vδT []ΔTree // changes to tree keys; rev↑. covers keys ∈ tracket subset
 
 	// {}k/v @tail for keys that are changed in (tail, head].
 	KVAtTail map[Key]Value
@@ -128,7 +124,7 @@ type ΔTreeTail struct {
 // ΔTree describes changes to one BTree in one revision.
 type ΔTree struct {
 	Rev  zodb.Tid
-	Root *Tree		// XXX ok to have here?
+//	Root *Tree		// XXX ok to have here?
 	KV   map[Key]Value
 }
 
@@ -271,15 +267,15 @@ func (δΒtail *ΔTail) Get(root *Tree, key Key, at zodb.Tid) (value Value, ok b
 	// XXX stub -> that only ZBlk.rev is used
 
 	// XXX -> index lastXXXOf(key) | linear scan ↓ looking for change <= at
-	δt := δΒtail.byRoot[root]
-	for i := len(δt.δTtail)-1; i >= 0; i-- {
-		δ := δt.δTtail[i]
-		if at < δ.Rev {
+	δTtail := δΒtail.byRoot[root]
+	for i := len(δTtail.vδT)-1; i >= 0; i-- {
+		δT := δTtail.vδT[i]
+		if at < δT.Rev {
 			continue
 		}
-		value, ok = δ.KV[key]
+		value, ok = δT.KV[key]
 		if ok {
-			rev = δ.Rev
+			rev = δT.Rev
 			revExact = true
 			break
 		}
@@ -291,7 +287,7 @@ func (δΒtail *ΔTail) Get(root *Tree, key Key, at zodb.Tid) (value Value, ok b
 	}
 
 	// key not in history tail
-	value, ok = δt.KVAtTail[key]
+	value, ok = δTtail.KVAtTail[key]
 	rev = δΒtail.Tail()
 	revExact = false
 	return

wcfs/wcfs.go

@@ -408,6 +408,7 @@ package main
 //
 // δZ    - change in ZODB space
 // δB    - change in BTree*s* space
+// δT    - change in BTree(1) space
 // δF    - change in File*s* space
 // δfile - change in File(1) space