/
batch.go
54 lines (45 loc) · 964 Bytes
/
batch.go
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package datastore
type verb int
type op struct {
delete bool
value []byte
}
// basicBatch implements the transaction interface for datastores who do
// not have any sort of underlying transactional support
type basicBatch struct {
ops map[Key]op
target Datastore
}
func NewBasicBatch(ds Datastore) Batch {
return &basicBatch{
ops: make(map[Key]op),
target: ds,
}
}
func (bt *basicBatch) Put(key Key, val []byte) error {
bt.ops[key] = op{value: val}
return nil
}
func (bt *basicBatch) Delete(key Key) error {
bt.ops[key] = op{delete: true}
return nil
}
func (bt *basicBatch) Commit() error {
var err error
for k, op := range bt.ops {
if op.delete {
err = bt.target.Delete(k)
// We could try to do something smarter but I really
// don't care. Delete should be idempotent anyways.
if err == ErrNotFound {
err = nil
}
} else {
err = bt.target.Put(k, op.value)
}
if err != nil {
break
}
}
return err
}