mirror of
https://gitee.com/milvus-io/milvus.git
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118 lines
2.4 KiB
Go
118 lines
2.4 KiB
Go
package memkv
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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() *MemoryKV {
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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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func (kv *MemoryKV) MultiLoad(keys []string) ([]string, error) {
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kv.RLock()
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defer kv.RUnlock()
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result := make([]string, 0, len(keys))
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for _, key := range keys {
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item := kv.tree.Get(memoryKVItem{key, ""})
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result = append(result, item.(memoryKVItem).value)
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}
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return result, nil
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}
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func (kv *MemoryKV) MultiSave(kvs map[string]string) error {
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kv.Lock()
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defer kv.Unlock()
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for key, value := range kvs {
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kv.tree.ReplaceOrInsert(memoryKVItem{key, value})
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}
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return nil
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}
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func (kv *MemoryKV) MultiRemove(keys []string) error {
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kv.Lock()
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defer kv.Unlock()
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for _, key := range keys {
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kv.tree.Delete(memoryKVItem{key, ""})
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}
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return nil
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}
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func (kv *MemoryKV) MultiSaveAndRemove(saves map[string]string, removals []string) error {
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kv.Lock()
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defer kv.Unlock()
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for key, value := range saves {
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kv.tree.ReplaceOrInsert(memoryKVItem{key, value})
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}
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for _, key := range removals {
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kv.tree.Delete(memoryKVItem{key, ""})
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}
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return nil
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}
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// todo
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func (kv *MemoryKV) LoadWithPrefix(key string) ([]string, []string, error) {
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panic("implement me")
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}
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func (kv *MemoryKV) Close() {
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}
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