github.com/matrixorigin/matrixone@v0.7.0/pkg/txn/storage/memorystorage/memtable/transaction.go (about)

     1  // Copyright 2022 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package memtable
    16  
    17  import "github.com/matrixorigin/matrixone/pkg/txn/storage/memorystorage/memorytable"
    18  
    19  type Transaction struct {
    20  	ID              string
    21  	BeginTime       Time
    22  	Time            Time
    23  	CommitTime      Time
    24  	State           *memorytable.Atomic[TransactionState]
    25  	IsolationPolicy IsolationPolicy
    26  	committers      map[TxCommitter]struct{}
    27  }
    28  
    29  type TxCommitter interface {
    30  	CommitTx(*Transaction) error
    31  	AbortTx(*Transaction) error
    32  }
    33  
    34  func NewTransaction(
    35  	id string,
    36  	t Time,
    37  	isolationPolicy IsolationPolicy,
    38  ) *Transaction {
    39  	return &Transaction{
    40  		ID:              id,
    41  		BeginTime:       t,
    42  		Time:            t,
    43  		State:           memorytable.NewAtomic[TransactionState](Active),
    44  		IsolationPolicy: isolationPolicy,
    45  		committers:      make(map[TxCommitter]struct{}),
    46  	}
    47  }
    48  
    49  type TransactionState uint8
    50  
    51  const (
    52  	Active = iota
    53  	Committed
    54  	Aborted
    55  )
    56  
    57  func (t *Transaction) Commit(commitTime Time) error {
    58  	t.CommitTime = commitTime
    59  	for committer := range t.committers {
    60  		if err := committer.CommitTx(t); err != nil {
    61  			return err
    62  		}
    63  	}
    64  	t.State.Store(Committed)
    65  	return nil
    66  }
    67  
    68  func (t *Transaction) Abort() error {
    69  	var e error
    70  	for committer := range t.committers {
    71  		if err := committer.AbortTx(t); err != nil {
    72  			e = err
    73  		}
    74  	}
    75  	t.State.Store(Aborted)
    76  	return e
    77  }
    78  
    79  func (t *Transaction) Copy() *Transaction {
    80  	newTx := *t
    81  	newTx.State = new(memorytable.Atomic[TransactionState])
    82  	newTx.State.Store(t.State.Load())
    83  	newTx.committers = make(map[TxCommitter]struct{})
    84  	return &newTx
    85  }