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compaction.go
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compaction.go
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// Copyright 2017-2019 Lei Ni (nilei81@gmail.com)
//
// 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 logdb
import (
"sync"
"github.com/lni/dragonboat/raftio"
)
type task struct {
clusterID uint64
nodeID uint64
index uint64
}
type compactions struct {
mu sync.Mutex
pendings map[raftio.NodeInfo]uint64
}
func newCompactions() *compactions {
return &compactions{
pendings: make(map[raftio.NodeInfo]uint64),
}
}
func (p *compactions) len() int {
p.mu.Lock()
defer p.mu.Unlock()
return len(p.pendings)
}
func (p *compactions) addTask(task task) {
p.mu.Lock()
defer p.mu.Unlock()
key := raftio.NodeInfo{
ClusterID: task.clusterID,
NodeID: task.nodeID,
}
v, ok := p.pendings[key]
if ok && v > task.index {
panic("existing index > task.index")
}
p.pendings[key] = task.index
}
func (p *compactions) getTask() (task, bool) {
p.mu.Lock()
defer p.mu.Unlock()
hasTask := false
task := task{}
for k, v := range p.pendings {
task.clusterID = k.ClusterID
task.nodeID = k.NodeID
task.index = v
hasTask = true
break
}
if hasTask {
key := raftio.NodeInfo{
ClusterID: task.clusterID,
NodeID: task.nodeID,
}
delete(p.pendings, key)
}
return task, hasTask
}