github.com/codingfuture/orig-energi3@v0.8.4/ethdb/interface.go (about)

     1  // Copyright 2014 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package ethdb
    18  
    19  // Code using batches should try to add this much data to the batch.
    20  // The value was determined empirically.
    21  const IdealBatchSize = 100 * 1024
    22  
    23  // Putter wraps the database write operation supported by both batches and regular databases.
    24  type Putter interface {
    25  	Put(key []byte, value []byte) error
    26  }
    27  
    28  // Deleter wraps the database delete operation supported by both batches and regular databases.
    29  type Deleter interface {
    30  	Delete(key []byte) error
    31  }
    32  
    33  // Database wraps all database operations. All methods are safe for concurrent use.
    34  type Database interface {
    35  	Putter
    36  	Deleter
    37  	Get(key []byte) ([]byte, error)
    38  	Has(key []byte) (bool, error)
    39  	Close()
    40  	NewBatch() Batch
    41  }
    42  
    43  // Batch is a write-only database that commits changes to its host database
    44  // when Write is called. Batch cannot be used concurrently.
    45  type Batch interface {
    46  	Putter
    47  	Deleter
    48  	ValueSize() int // amount of data in the batch
    49  	Write() error
    50  	// Reset resets the batch for reuse
    51  	Reset()
    52  }