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compaction.go
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compaction.go
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// Copyright 2017-2020 Lei Ni (nilei81@gmail.com) and other contributors.
//
// 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/vyevenko/dragonboat/v3/raftio"
)
type task struct {
clusterID uint64
nodeID uint64
index uint64
done chan struct{}
}
type compactionInfo struct {
index uint64
done chan struct{}
}
type compactions struct {
mu sync.Mutex
pendings map[raftio.NodeInfo]compactionInfo
}
func newCompactions() *compactions {
return &compactions{
pendings: make(map[raftio.NodeInfo]compactionInfo),
}
}
func (p *compactions) len() int {
p.mu.Lock()
defer p.mu.Unlock()
return len(p.pendings)
}
func (p *compactions) addTask(task task) chan struct{} {
p.mu.Lock()
defer p.mu.Unlock()
key := raftio.NodeInfo{
ClusterID: task.clusterID,
NodeID: task.nodeID,
}
ci := compactionInfo{index: task.index}
v, ok := p.pendings[key]
if ok && v.index > task.index {
panic("existing index > task.index")
}
if ok {
ci.done = v.done
} else {
ci.done = make(chan struct{})
}
p.pendings[key] = ci
return ci.done
}
func (p *compactions) getTask() (task, bool) {
p.mu.Lock()
defer p.mu.Unlock()
for k, v := range p.pendings {
task := task{
clusterID: k.ClusterID,
nodeID: k.NodeID,
index: v.index,
done: v.done,
}
delete(p.pendings, k)
return task, true
}
return task{}, false
}