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  }