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https://gitee.com/milvus-io/milvus.git
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82 lines
1.8 KiB
Go
82 lines
1.8 KiB
Go
// Copyright 2017 TiKV Project Authors.
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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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kv
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import (
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"sync"
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"github.com/google/btree"
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)
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type memoryKV struct {
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sync.RWMutex
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tree *btree.BTree
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}
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// NewMemoryKV returns an in-memory kvBase for testing.
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func NewMemoryKV() Base {
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return &memoryKV{
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tree: btree.New(2),
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}
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}
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type memoryKVItem struct {
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key, value string
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}
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func (s memoryKVItem) Less(than btree.Item) bool {
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return s.key < than.(memoryKVItem).key
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}
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func (kv *memoryKV) Load(key string) (string, error) {
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kv.RLock()
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defer kv.RUnlock()
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item := kv.tree.Get(memoryKVItem{key, ""})
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if item == nil {
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return "", nil
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}
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return item.(memoryKVItem).value, nil
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}
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func (kv *memoryKV) LoadRange(key, endKey string, limit int) ([]string, []string, error) {
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kv.RLock()
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defer kv.RUnlock()
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keys := make([]string, 0, limit)
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values := make([]string, 0, limit)
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kv.tree.AscendRange(memoryKVItem{key, ""}, memoryKVItem{endKey, ""}, func(item btree.Item) bool {
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keys = append(keys, item.(memoryKVItem).key)
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values = append(values, item.(memoryKVItem).value)
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if limit > 0 {
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return len(keys) < limit
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}
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return true
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})
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return keys, values, nil
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}
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func (kv *memoryKV) Save(key, value string) error {
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kv.Lock()
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defer kv.Unlock()
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kv.tree.ReplaceOrInsert(memoryKVItem{key, value})
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return nil
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}
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func (kv *memoryKV) Remove(key string) error {
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kv.Lock()
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defer kv.Unlock()
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kv.tree.Delete(memoryKVItem{key, ""})
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return nil
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}
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