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