blob: dd228242a343e7d748f7bd76cc0bb61dfc283301 [file] [log] [blame]
// Copyright 2015 The LUCI 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 memory
import (
"sync/atomic"
ds "go.chromium.org/gae/service/datastore"
"go.chromium.org/luci/common/errors"
"golang.org/x/net/context"
)
type transactionImpl struct {
// boolean 0 or 1, use atomic.*Int32 to access.
closed int32
isXG bool
}
func (ti *transactionImpl) close() error {
if !atomic.CompareAndSwapInt32(&ti.closed, 0, 1) {
return errors.New("transaction is already closed")
}
return nil
}
func (ti *transactionImpl) valid() error {
if atomic.LoadInt32(&ti.closed) == 1 {
return errors.New("transaction has expired")
}
return nil
}
func assertTxnValid(c context.Context) error {
t := ds.CurrentTransaction(c)
if t == nil {
return nil
}
return t.(*transactionImpl).valid()
}