github.com/klaytn/klaytn@v1.10.2/datasync/chaindatafetcher/kafka/checkpoint_db.go (about)

     1  // Copyright 2020 The klaytn Authors
     2  // This file is part of the klaytn library.
     3  //
     4  // The klaytn library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The klaytn library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the klaytn library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package kafka
    18  
    19  import (
    20  	"github.com/klaytn/klaytn/storage/database"
    21  )
    22  
    23  type CheckpointDB struct {
    24  	manager database.DBManager
    25  }
    26  
    27  func NewCheckpointDB() *CheckpointDB {
    28  	return &CheckpointDB{}
    29  }
    30  
    31  func (db *CheckpointDB) ReadCheckpoint() (int64, error) {
    32  	checkpoint, err := db.manager.ReadChainDataFetcherCheckpoint()
    33  	return int64(checkpoint), err
    34  }
    35  
    36  func (db *CheckpointDB) WriteCheckpoint(checkpoint int64) error {
    37  	return db.manager.WriteChainDataFetcherCheckpoint(uint64(checkpoint))
    38  }
    39  
    40  func (db *CheckpointDB) SetComponent(component interface{}) {
    41  	switch c := component.(type) {
    42  	case database.DBManager:
    43  		db.manager = c
    44  	}
    45  }