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replication.go
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replication.go
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// Copyright 2016 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 server
import "sync/atomic"
// Replication provides some help to do replication.
type Replication struct {
replicateCfg atomic.Value
}
func newReplication(cfg *ReplicationConfig) *Replication {
r := &Replication{}
r.store(cfg)
return r
}
func (r *Replication) load() *ReplicationConfig {
return r.replicateCfg.Load().(*ReplicationConfig)
}
func (r *Replication) store(cfg *ReplicationConfig) {
r.replicateCfg.Store(cfg)
}
// GetMaxReplicas returns the number of replicas for each region.
func (r *Replication) GetMaxReplicas() int {
return int(r.load().MaxReplicas)
}
// SetMaxReplicas set the replicas for each region.
func (r *Replication) SetMaxReplicas(replicas int) {
c := r.load()
v := c.clone()
v.MaxReplicas = uint64(replicas)
r.store(v)
}
// GetLocationLabels returns the location labels for each region
func (r *Replication) GetLocationLabels() []string {
return r.load().LocationLabels
}