github.com/igggame/nebulas-go@v2.1.0+incompatible/storage/memory_storage.go (about)

     1  // Copyright (C) 2017 go-nebulas authors
     2  //
     3  // This file is part of the go-nebulas library.
     4  //
     5  // the go-nebulas library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // the go-nebulas library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  // GNU General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU General Public License
    16  // along with the go-nebulas library.  If not, see <http://www.gnu.org/licenses/>.
    17  //
    18  
    19  package storage
    20  
    21  import (
    22  	"sync"
    23  
    24  	"github.com/nebulasio/go-nebulas/util/byteutils"
    25  )
    26  
    27  // MemoryStorage the nodes in trie.
    28  type MemoryStorage struct {
    29  	data *sync.Map
    30  }
    31  
    32  // kv entry
    33  type kv struct{ k, v []byte }
    34  
    35  // MemoryBatch do batch task in memory storage
    36  type MemoryBatch struct {
    37  	db      *MemoryStorage
    38  	entries []*kv
    39  }
    40  
    41  // NewMemoryStorage init a storage
    42  func NewMemoryStorage() (*MemoryStorage, error) {
    43  	return &MemoryStorage{
    44  		data: new(sync.Map),
    45  	}, nil
    46  }
    47  
    48  // Get return value to the key in Storage
    49  func (db *MemoryStorage) Get(key []byte) ([]byte, error) {
    50  	if entry, ok := db.data.Load(byteutils.Hex(key)); ok {
    51  		return entry.([]byte), nil
    52  	}
    53  	return nil, ErrKeyNotFound
    54  }
    55  
    56  // Put put the key-value entry to Storage
    57  func (db *MemoryStorage) Put(key []byte, value []byte) error {
    58  	db.data.Store(byteutils.Hex(key), value)
    59  	return nil
    60  }
    61  
    62  // Del delete the key in Storage.
    63  func (db *MemoryStorage) Del(key []byte) error {
    64  	db.data.Delete(byteutils.Hex(key))
    65  	return nil
    66  }
    67  
    68  // EnableBatch enable batch write.
    69  func (db *MemoryStorage) EnableBatch() {
    70  }
    71  
    72  // Flush write and flush pending batch write.
    73  func (db *MemoryStorage) Flush() error {
    74  	return nil
    75  }
    76  
    77  // DisableBatch disable batch write.
    78  func (db *MemoryStorage) DisableBatch() {
    79  }