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file_cache.go
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file_cache.go
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// Copyright 2022 The CubeFS Authors.
//
// 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 wal
import "container/list"
type openFunc func(logName) (*logFile, error)
type logFileCache struct {
capacity int
l *list.List
m map[logName]*list.Element
f openFunc
}
func newLogFileCache(capacity int, f openFunc) *logFileCache {
return &logFileCache{
capacity: capacity,
l: list.New(),
m: make(map[logName]*list.Element, capacity),
f: f,
}
}
func (lc *logFileCache) Get(name logName) (lf *logFile, err error) {
e, ok := lc.m[name]
if ok {
lf = (e.Value).(*logFile)
lc.l.MoveToFront(e)
return
}
lf, err = lc.f(name)
if err != nil {
return
}
e = lc.l.PushFront(lf)
lc.m[name] = e
for lc.l.Len() > lc.capacity {
e = lc.l.Back()
df := (e.Value).(*logFile)
lc.Delete(df.Name())
}
return
}
func (lc *logFileCache) Delete(name logName) error {
e, ok := lc.m[name]
if !ok {
return nil
}
delete(lc.m, name)
lc.l.Remove(e)
return nil
}
func (lc *logFileCache) Close() (err error) {
for name, e := range lc.m {
delete(lc.m, name)
lc.l.Remove(e)
}
return
}