mirror of https://github.com/go-gitea/gitea.git
52 lines
1.3 KiB
Go
52 lines
1.3 KiB
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,
|
||
|
|
// 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
|
||
|
|
}
|