tidb version 源码
tidb version 代码
文件路径：/kv/version.go
// Copyright 2015 PingCAP, Inc.
//
// 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 kv
import "math"
// VersionProvider provides increasing IDs.
type VersionProvider interface {
CurrentVersion() (Version, error)
}
// Version is the wrapper of KV's version.
type Version struct {
Ver uint64
}
var (
// MaxVersion is the maximum version, notice that it's not a valid version.
MaxVersion = Version{Ver: math.MaxUint64}
// MinVersion is the minimum version, it's not a valid version, too.
MinVersion = Version{Ver: 0}
)
// NewVersion creates a new Version struct.
func NewVersion(v uint64) Version {
return Version{
Ver: v,
}
}
// Cmp returns the comparison result of two versions.
// The result will be 0 if a==b, -1 if a < b, and +1 if a > b.
func (v Version) Cmp(another Version) int {
if v.Ver > another.Ver {
return 1
} else if v.Ver < another.Ver {
return -1
}
return 0
}
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