a9c07acbfa
refactor to share code in emulated batch refactor to share code in emulated merge refactor index kvstore benchmarks to share more code refactor index kvstore benchmarks to be more repeatable
97 lines
2.1 KiB
Go
97 lines
2.1 KiB
Go
// Copyright (c) 2015 Couchbase, Inc.
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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
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// License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an "AS
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// IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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// express or implied. See the License for the specific language
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// governing permissions and 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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"sync"
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"github.com/blevesearch/bleve/index/store"
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"github.com/blevesearch/bleve/registry"
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"github.com/steveyen/gtreap"
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)
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const Name = "gtreap"
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func init() {
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registry.RegisterKVStore(Name, StoreConstructor)
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}
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const MAX_CONCURRENT_WRITERS = 1
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func StoreConstructor(config map[string]interface{}) (store.KVStore, error) {
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s := &Store{
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availableWriters: make(chan bool, MAX_CONCURRENT_WRITERS),
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t: gtreap.NewTreap(itemCompare),
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}
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for i := 0; i < MAX_CONCURRENT_WRITERS; i++ {
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s.availableWriters <- true
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}
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return s, nil
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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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type Store struct {
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availableWriters chan bool
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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 Writer struct {
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s *Store
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}
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func (s *Store) Open() error {
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return nil
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}
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func (s *Store) SetMergeOperator(mo store.MergeOperator) {
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s.mo = mo
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}
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func (s *Store) Close() error {
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close(s.availableWriters)
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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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available, ok := <-s.availableWriters
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if !ok || !available {
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return nil, fmt.Errorf("no available writers")
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}
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return &Writer{s: s}, nil
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}
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