github.com/tenywen/fabric@v1.0.0-beta.0.20170620030522-a5b1ed380643/core/ledger/kvledger/history/historydb/historydb.go (about) 1 /* 2 Copyright IBM Corp. 2016 All Rights Reserved. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package historydb 18 19 import ( 20 "github.com/hyperledger/fabric/common/ledger/blkstorage" 21 "github.com/hyperledger/fabric/core/ledger" 22 "github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/version" 23 "github.com/hyperledger/fabric/protos/common" 24 ) 25 26 // HistoryDBProvider provides an instance of a history DB 27 type HistoryDBProvider interface { 28 // GetDBHandle returns a handle to a HistoryDB 29 GetDBHandle(id string) (HistoryDB, error) 30 // Close closes all the HistoryDB instances and releases any resources held by HistoryDBProvider 31 Close() 32 } 33 34 // HistoryDB - an interface that a history database should implement 35 type HistoryDB interface { 36 NewHistoryQueryExecutor(blockStore blkstorage.BlockStore) (ledger.HistoryQueryExecutor, error) 37 Commit(block *common.Block) error 38 GetLastSavepoint() (*version.Height, error) 39 ShouldRecover(lastAvailableBlock uint64) (bool, uint64, error) 40 CommitLostBlock(block *common.Block) error 41 }