.

go/zodb/btree/btree.go

@@ -26,6 +26,8 @@
 //
 // node.Entryv() returns [] of (key, child/value).
 //
+// BTree.FirstBucket() and Bucket.Next() allows to iterate in terms of B⁺ tree nodes.
+//
 // --------
 //
 // (*) https://github.com/zopefoundation/ZODB/blob/3.10.7-4-gb8d7a8567/src/BTrees/Development.txt#L211

go/zodb/btree/btree.go.in

@@ -133,6 +133,18 @@ func (b *Bucket) Entryv() []BucketEntry {
 	return ev
 }
 
+// ---- node-level iteration ----
+
+// XXX
+func (t *BTree) FirstBucket() *Bucket {
+	return t.firstbucket
+}
+
+// XXX
+func (b *Bucket) Next() *Bucket {
+	return b.next
+}
+
 // ---- point query ----
 
 // Get searches BTree by key.
@@ -226,6 +238,7 @@ func (t *BTree) MinKey(ctx context.Context) (_ KEY, _ bool, err error) {
 		return 0, false, nil
 	}
 
+	// XXX -> just use t.firstBucket
 	for {
 		child := t.data[0].child.(zodb.IPersistent)
 		t.PDeactivate()

go/zodb/btree/ziobtree.go

@@ -135,6 +135,18 @@ func (b *IOBucket) Entryv() []IOBucketEntry {
 	return ev
 }
 
+// ---- node-level iteration ----
+
+// XXX
+func (t *IOBTree) FirstBucket() *IOBucket {
+	return t.firstbucket
+}
+
+// XXX
+func (b *IOBucket) Next() *IOBucket {
+	return b.next
+}
+
 // ---- point query ----
 
 // Get searches IOBTree by key.

go/zodb/btree/zlobtree.go

@@ -135,6 +135,18 @@ func (b *LOBucket) Entryv() []LOBucketEntry {
 	return ev
 }
 
+// ---- node-level iteration ----
+
+// XXX
+func (t *LOBTree) FirstBucket() *LOBucket {
+	return t.firstbucket
+}
+
+// XXX
+func (b *LOBucket) Next() *LOBucket {
+	return b.next
+}
+
 // ---- point query ----
 
 // Get searches LOBTree by key.

go/zodb/persistent.go

@@ -58,6 +58,7 @@ import (
 type Persistent struct {
 	// ZODB class of this object.
 	// XXX it could be deduced via typeTab[reflect.TypeOf(.instance)]
+	// XXX or better drop .instance and deduce it via casting to .zclass.typ
 	zclass *zclass
 
 	jar    *Connection

go/zodb/zodb.go

@@ -326,6 +326,9 @@ type IStorage interface {
 	IStorageDriver
 
 	Prefetcher
+	//Loader
+	//Iterator
+	//XXXNotifier() -> Notifier // dedicated notifier for every open?
 }
 
 // Prefetcher provides functionality to prefetch objects.
@@ -362,8 +365,8 @@ type IStorageDriver interface {
 	// The notifier represents invalidation channel (notify about changes
 	// made to DB not by us from outside).	XXX
 	//
-	// To simplify drivets, there must be only 1 logical user of
-	// storage-driver level notifier interface. Ccontrary IStorage allows
+	// To simplify drivers, there must be only 1 logical user of
+	// storage-driver level notifier interface. Contrary IStorage allows
 	// for several users of notification channel.	XXX ok?
 	//
 	// XXX -> nil, if driver does not support notifications?