// NewBatch returns an implementation that allows batch writes. Note that the bolt
// implementation spawns a goroutine that will live until a Commit() is issued.
func (bdb *BoltDB) NewBatch() Batch {
b := new(batch)
b.db = bdb.db
b.ch = make(chan batchOp)
go func() {
tx, err := b.db.Begin(true)
if err != nil {
dvid.Error("Error on beginning bolt db batch write: %s", err.Error())
return
}
for {
curOp := <-b.ch
// If this is the first op, determine the Bucket based on the key type.
if b.bucket == nil {
if curOp.kv.K == nil {
dvid.Error("Nil key sent to bolt db batch routine!")
return
}
bucketName := curOp.kv.K.KeyType().String()
b.bucket = tx.Bucket(bucketName)
}
// Do the operation.
switch curOp.op {
case PutOp:
kBytes := curOp.kv.K.Bytes()
if err := b.bucket.Put(kBytes, curOp.kv.V); err != nil {
dvid.Error("Error in bolt db batch Put: %s", err.Error())
return
}
StoreKeyBytesWritten <- len(kBytes)
StoreValueBytesWritten <- len(curOp.kv.V)
case DeleteOp:
kBytes := curOp.kv.K.Bytes()
if err := b.bucket.Delete(kBytes); err != nil {
dvid.Error("Error in bolt db batch Delete: %s", err.Error())
return
}
case CommitOp:
tx.Commit()
return
default:
dvid.Error("Unknown batch op %d", curOp.op)
return
}
}
}()
return b
}
func (b *batch) Delete(k Key) {
if b != nil {
dvid.StartCgo()
defer dvid.StopCgo()
if err := b.txn.Del(b.dbi, k.Bytes(), nil); err != nil {
dvid.Error("Error in batch Delete: %s", err.Error())
}
}
}
// NewBatch returns an implementation that allows batch writes. This lmdb implementation
// uses a transaction for the batch.
func (db *LMDB) NewBatch() Batch {
if db == nil || db.env == nil {
dvid.Error("Cannot do NewBatch() of lmdb with nil database")
return nil
}
b := new(batch)
b.env = db.env
b.dbi = db.dbi
dvid.StartCgo()
defer dvid.StopCgo()
txn, err := db.env.BeginTxn(nil, 0)
if err != nil {
dvid.Error("Error in BeginTxn() for NewBatch() of lmdb")
return nil
}
b.txn = txn
return b
}
func (b *batch) Put(k Key, v []byte) {
if b != nil {
dvid.StartCgo()
defer dvid.StopCgo()
kBytes := k.Bytes()
if v == nil || len(v) == 0 {
v = []byte{0}
}
if err := b.txn.Put(b.dbi, kBytes, v, 0); err != nil {
dvid.Error("Error in batch Put: %s", err.Error())
return
}
StoreKeyBytesWritten <- len(kBytes)
StoreValueBytesWritten <- len(v)
}
}