github.com/vescale/zgraph@v0.0.0-20230410094002-959c02d50f95/storage/mvcc/op.go (about)

     1  // Copyright 2022 zGraph Authors. All rights reserved.
     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 mvcc
    16  
    17  type Op int32
    18  
    19  const (
    20  	Op_Put      Op = 0
    21  	Op_Del      Op = 1
    22  	Op_Lock     Op = 2
    23  	Op_Rollback Op = 3
    24  	// insert operation has a constraint that key should not exist before.
    25  	Op_Insert         Op = 4
    26  	Op_CheckNotExists Op = 5
    27  )