.

go/zodb/btree/testdata/.gitignore

+/*.lock
+/*.tmp
+/*.tr[0-9]

go/zodb/persistent.go

@@ -31,7 +31,9 @@ import (
 //
 // but is not exactly equal to it.
 //
-// XXX safe to access from multiple goroutines simultaneously.
+// It is safe to access IPersistent from multiple goroutines simultaneously.
+//
+// Use Persistent as the base for application-level types that need to provide persistency.
 type IPersistent interface {
 	PJar()    *Connection	// Connection this in-RAM object is part of.
 	POid()    Oid		// object ID in the database.
@@ -126,7 +128,7 @@ const (
 //	type myObjectState MyObject
 //
 //	func (o *myObjectState) DropState() { ... }
-//	func (o *myObjectState) PySetState(pystate interface{}) { ... }
+//	func (o *myObjectState) PySetState(pystate interface{}) error { ... }
 //
 //	func init() {
 //		t := reflect.TypeOf

go/zodb/persistent_test.go

+// Copyright (C) 2018  Nexedi SA and Contributors.
+//                     Kirill Smelkov <kirr@nexedi.com>
+//
+// This program is free software: you can Use, Study, Modify and Redistribute
+// it under the terms of the GNU General Public License version 3, or (at your
+// option) any later version, as published by the Free Software Foundation.
+//
+// You can also Link and Combine this program with other software covered by
+// the terms of any of the Free Software licenses or any of the Open Source
+// Initiative approved licenses and Convey the resulting work. Corresponding
+// source of such a combination shall include the source code for all other
+// software used.
+//
+// This program is distributed WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+//
+// See COPYING file for full licensing terms.
+// See https://www.nexedi.com/licensing for rationale and options.
+
 package zodb
-// TODO
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+type MyObject struct {
+	Persistent
+
+	value string
+}
+
+type myObjectState MyObject
+
+func (o *myObjectState) DropState() {
+	o.value = ""
+}
+
+func (o *myObjectState) PySetState(pystate interface{}) error {
+	s, ok := pystate.(string)
+	if !ok {
+		return fmt.Errorf("myobject: setstate: want str; got %T", pystate)
+	}
+
+	o.value = s
+	return nil
+}
+
+func init() {
+	t := reflect.TypeOf
+	RegisterClass("t.zodb.MyObject", t(MyObject{}), t(myObjectState{}))
+}
+
+
+
+func TestPersistent(t *testing.T) {
+	// XXX
+}