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goleveldb_batch.go
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goleveldb_batch.go
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package db
import (
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/opt"
)
type goLevelDBBatch struct {
db *GoLevelDB
batch *leveldb.Batch
}
var _ Batch = (*goLevelDBBatch)(nil)
func newGoLevelDBBatch(db *GoLevelDB) *goLevelDBBatch {
return &goLevelDBBatch{
db: db,
batch: new(leveldb.Batch),
}
}
// Set implements Batch.
func (b *goLevelDBBatch) Set(key, value []byte) error {
if len(key) == 0 {
return errKeyEmpty
}
if value == nil {
return errValueNil
}
if b.batch == nil {
return errBatchClosed
}
b.batch.Put(key, value)
return nil
}
// Delete implements Batch.
func (b *goLevelDBBatch) Delete(key []byte) error {
if len(key) == 0 {
return errKeyEmpty
}
if b.batch == nil {
return errBatchClosed
}
b.batch.Delete(key)
return nil
}
// Write implements Batch.
func (b *goLevelDBBatch) Write() error {
return b.write(false)
}
// WriteSync implements Batch.
func (b *goLevelDBBatch) WriteSync() error {
return b.write(true)
}
func (b *goLevelDBBatch) write(sync bool) error {
if b.batch == nil {
return errBatchClosed
}
err := b.db.db.Write(b.batch, &opt.WriteOptions{Sync: sync})
if err != nil {
return err
}
// Make sure batch cannot be used afterwards. Callers should still call Close(), for errors.
return b.Close()
}
// Close implements Batch.
func (b *goLevelDBBatch) Close() error {
if b.batch != nil {
b.batch.Reset()
b.batch = nil
}
return nil
}