github.com/matrixorigin/matrixone@v0.7.0/pkg/txn/storage/memorystorage/memtable/isolation.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  type IsolationPolicy struct {
    18  	Read ReadPolicy
    19  }
    20  
    21  type ReadPolicy uint8
    22  
    23  const (
    24  	ReadCommitted ReadPolicy = iota + 1
    25  	ReadSnapshot
    26  	ReadNoStale
    27  )
    28  
    29  var SnapshotIsolation = IsolationPolicy{
    30  	Read: ReadSnapshot,
    31  }
    32  
    33  var Serializable = IsolationPolicy{
    34  	Read: ReadNoStale,
    35  }