65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package structure
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import (
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"github.com/juju/errors"
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"github.com/pingcap/tidb/kv"
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)
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// ErrTxDone is the error return after transaction has already been committed or rolled back.
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var ErrTxDone = errors.Errorf("Transaction has already been committed or rolled back")
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// TStructure supports some simple data structure like string, hash, list, etc... and
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// you can use these in a transaction.
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type TStructure struct {
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txn kv.Transaction
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done bool
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}
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// Begin starts a new transaction.
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func Begin(store kv.Storage) (*TStructure, error) {
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t := &TStructure{done: false}
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var err error
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t.txn, err = store.Begin()
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if err != nil {
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return nil, errors.Trace(err)
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}
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return t, nil
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}
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// Commit commits the transaction.
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func (t *TStructure) Commit() error {
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if t.done {
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return ErrTxDone
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}
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t.done = true
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return errors.Trace(t.txn.Commit())
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}
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// Rollback rolls back the transaction.
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func (t *TStructure) Rollback() error {
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if t.done {
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return ErrTxDone
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}
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t.done = true
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return errors.Trace(t.txn.Rollback())
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}
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