1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071 |
- // Copyright 2018 The go-ethereum Authors
- // This file is part of the go-ethereum library.
- //
- // The go-ethereum library is free software: you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // The go-ethereum library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the GNU Lesser General Public License
- // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
- package ethdb
- // IdealBatchSize defines the size of the data batches should ideally add in one
- // write.
- const IdealBatchSize = 100 * 1024
- // Batch is a write-only database that commits changes to its host database
- // when Write is called. A batch cannot be used concurrently.
- type Batch interface {
- KeyValueWriter
- // ValueSize retrieves the amount of data queued up for writing.
- ValueSize() int
- // Write flushes any accumulated data to disk.
- Write() error
- // Reset resets the batch for reuse.
- Reset()
- // Replay replays the batch contents.
- Replay(w KeyValueWriter) error
- }
- // Batcher wraps the NewBatch method of a backing data store.
- type Batcher interface {
- // NewBatch creates a write-only database that buffers changes to its host db
- // until a final write is called.
- NewBatch() Batch
- }
- // HookedBatch wraps an arbitrary batch where each operation may be hooked into
- // to monitor from black box code.
- type HookedBatch struct {
- Batch
- OnPut func(key []byte, value []byte) // Callback if a key is inserted
- OnDelete func(key []byte) // Callback if a key is deleted
- }
- // Put inserts the given value into the key-value data store.
- func (b HookedBatch) Put(key []byte, value []byte) error {
- if b.OnPut != nil {
- b.OnPut(key, value)
- }
- return b.Batch.Put(key, value)
- }
- // Delete removes the key from the key-value data store.
- func (b HookedBatch) Delete(key []byte) error {
- if b.OnDelete != nil {
- b.OnDelete(key)
- }
- return b.Batch.Delete(key)
- }
|