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cmemdb.go
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cmemdb.go
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// Copyright (C) 2018 go-cloudcard authors
//
// This file is part of the go-cloudcard library.
//
// the go-cloudcard library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// the go-cloudcard library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with the go-cloudcard library. If not, see <http://www.gnu.org/licenses/>.
//
package cdb
import (
"cloudcard.pro/cloudcardio/go-cloudcard/util/byteutils"
"sync"
)
// MemoryDB the nodes in trie.
type MemoryDB struct {
data *sync.Map
}
// kv entry
type kv struct{ k, v []byte }
// MemoryBatch do batch task in memory storage
type MemoryBatch struct {
db *MemoryDB
entries []*kv
}
// NewMemoryStorage init a storage
func NewMemoryStorage() (*MemoryDB, error) {
return &MemoryDB{
data: new(sync.Map),
}, nil
}
// Get return value to the key in Storage
func (db *MemoryDB) Get(key []byte) ([]byte, error) {
if entry, ok := db.data.Load(byteutils.Hex(key)); ok {
return entry.([]byte), nil
}
return nil, ErrKeyNotFound
}
// Put put the key-value entry to Storage
func (db *MemoryDB) Put(key []byte, value []byte) error {
db.data.Store(byteutils.Hex(key), value)
return nil
}
// Del delete the key in Storage.
func (db *MemoryDB) Del(key []byte) error {
db.data.Delete(byteutils.Hex(key))
return nil
}
// EnableBatch enable batch write.
func (db *MemoryDB) EnableBatch() {
}
// Flush write and flush pending batch write.
func (db *MemoryDB) Flush() error {
return nil
}
// DisableBatch disable batch write.
func (db *MemoryDB) DisableBatch() {
}
func (db *MemoryDB) Has(key []byte) (bool, error) {
_, ok := db.data.Load(key)
return ok, nil
}
func (db *MemoryDB) ValueSize() int {
return 0
}
func (db *MemoryDB) Close() error {
return nil
}
func (db *MemoryDB) Delete(key []byte) error {
db.data.Delete(key)
return nil
}