github.com/zuoyebang/bitalosdb@v1.1.1-0.20240516111551-79a8c4d8ce20/meta_set.go (about) 1 // Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package bitalosdb 16 17 import ( 18 "sync/atomic" 19 20 "github.com/zuoyebang/bitalosdb/internal/base" 21 "github.com/zuoyebang/bitalosdb/internal/manifest" 22 ) 23 24 type metaEdit = manifest.MetaEditor 25 type bitowerMetaEditor = manifest.BitowerMetaEditor 26 27 type metaSet struct { 28 atomic struct { 29 logSeqNum uint64 30 visibleSeqNum uint64 31 } 32 33 dirname string 34 opts *Options 35 meta *manifest.Metadata 36 } 37 38 func (ms *metaSet) init(dirname string, opts *Options) error { 39 manifestPath := base.MakeFilepath(opts.FS, dirname, fileTypeMeta, 0) 40 meta, err := manifest.NewMetadata(manifestPath, opts.FS) 41 if err != nil { 42 return err 43 } 44 45 ms.dirname = dirname 46 ms.opts = opts 47 ms.meta = meta 48 ms.atomic.logSeqNum = 1 49 if meta.LastSeqNum != 0 { 50 ms.atomic.logSeqNum = meta.LastSeqNum + 1 51 } 52 53 return nil 54 } 55 56 func (ms *metaSet) apply(sme *bitowerMetaEditor) error { 57 me := &metaEdit{} 58 logSeqNum := atomic.LoadUint64(&ms.atomic.logSeqNum) 59 me.LastSeqNum = logSeqNum - 1 60 61 ms.meta.Write(me, sme) 62 63 return nil 64 } 65 66 func (ms *metaSet) close() error { 67 err := ms.meta.Close() 68 return err 69 }