watchable_store_txn.go
// Copyright 2017 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mvcc
import (
"go.etcd.io/etcd/mvcc/mvccpb"
"go.etcd.io/etcd/pkg/traceutil"
)
func (tw *watchableStoreTxnWrite) End() {
changes := tw.Changes()
if len(changes) == 0 {
tw.TxnWrite.End()
return
}
rev := tw.Rev() + 1
evs := make([]mvccpb.Event, len(changes))
for i, change := range changes {
evs[i].Kv = &changes[i]
if change.CreateRevision == 0 {
evs[i].Type = mvccpb.DELETE
evs[i].Kv.ModRevision = rev
} else {
evs[i].Type = mvccpb.PUT
}
}
// end write txn under watchable store lock so the updates are visible
// when asynchronous event posting checks the current store revision
tw.s.mu.Lock()
tw.s.notify(rev, evs)
tw.TxnWrite.End()
tw.s.mu.Unlock()
}
type watchableStoreTxnWrite struct {
TxnWrite
s *watchableStore
}
func (s *watchableStore) Write(trace *traceutil.Trace) TxnWrite {
return &watchableStoreTxnWrite{s.store.Write(trace), s}
}