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strategy.go
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strategy.go
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// Copyright 2019 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 purger
import "github.com/pingcap/dm/pkg/streamer"
type strategyType uint32
const (
strategyNone strategyType = iota
strategyInactive
strategyFilename
strategyTime
strategySpace
)
func (s strategyType) String() string {
switch s {
case strategyInactive:
return "inactive strategy"
case strategyFilename:
return "filename strategy"
case strategyTime:
return "time strategy"
case strategySpace:
return "space strategy"
default:
return "unknown strategy"
}
}
// PurgeStrategy represents a relay log purge strategy
// two purge behaviors
// 1. purge in the background
// 2. do one time purge process
// a strategy can support both or one of them
type PurgeStrategy interface {
// Check checks whether need to do the purge in the background automatically
Check(args interface{}) (bool, error)
// Do does the purge process one time
Do(args interface{}) error
// Purging indicates whether is doing purge
Purging() bool
// Type returns the strategy type
Type() strategyType
}
// StrategyArgs represents args needed by purge strategy
type StrategyArgs interface {
// SetActiveRelayLog sets active relay log info in args
// this should be called before do the purging
SetActiveRelayLog(active *streamer.RelayLogInfo)
}