Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

index/upsidedown/store/gtreap/store.go

@@ -0,0 +1,85 @@
+//  Copyright (c) 2015 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package gtreap provides an in-memory implementation of the
+// KVStore interfaces using the gtreap balanced-binary treap,
+// copy-on-write data structure.
+
+package gtreap
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"sync"
+
+	"github.com/blevesearch/bleve/v2/registry"
+	"github.com/blevesearch/gtreap"
+	store "github.com/blevesearch/upsidedown_store_api"
+)
+
+const Name = "gtreap"
+
+type Store struct {
+	m  sync.Mutex
+	t  *gtreap.Treap
+	mo store.MergeOperator
+}
+
+type Item struct {
+	k []byte
+	v []byte
+}
+
+func itemCompare(a, b interface{}) int {
+	return bytes.Compare(a.(*Item).k, b.(*Item).k)
+}
+
+func New(mo store.MergeOperator, config map[string]interface{}) (store.KVStore, error) {
+	path, ok := config["path"].(string)
+	if !ok {
+		return nil, fmt.Errorf("must specify path")
+	}
+	if path != "" {
+		return nil, os.ErrInvalid
+	}
+
+	rv := Store{
+		t:  gtreap.NewTreap(itemCompare),
+		mo: mo,
+	}
+	return &rv, nil
+}
+
+func (s *Store) Close() error {
+	return nil
+}
+
+func (s *Store) Reader() (store.KVReader, error) {
+	s.m.Lock()
+	t := s.t
+	s.m.Unlock()
+	return &Reader{t: t}, nil
+}
+
+func (s *Store) Writer() (store.KVWriter, error) {
+	return &Writer{s: s}, nil
+}
+
+func init() {
+	err := registry.RegisterKVStore(Name, New)
+	if err != nil {
+		panic(err)
+	}
+}