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config.go
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config.go
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// Copyright 2022 Linkall 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,
// 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 (
// standard libraries.
"time"
// this project.
ioengine "github.com/vanus-labs/vanus/internal/store/io/engine"
"github.com/vanus-labs/vanus/internal/store/io/stream"
"github.com/vanus-labs/vanus/internal/store/io/zone/segmentedfile"
)
const (
logFileExt = ".log"
defaultBlockSize = 16 * 1024
defaultFileSize = 128 * 1024 * 1024
defaultAppendBufferSize = 64
)
type config struct {
pos int64
cb OnEntryCallback
blockSize int
fileSize int64
flushDelayTime time.Duration // default: 3 * time.Millisecond
engine ioengine.Interface
readOnly bool
}
func (cfg *config) segmentedFileOptions() []segmentedfile.Option {
opts := []segmentedfile.Option{segmentedfile.WithExtension(logFileExt)}
if cfg.fileSize != 0 {
opts = append(opts, segmentedfile.WithSegmentSize(cfg.fileSize))
}
return opts
}
func (cfg *config) streamSchedulerOptions() []stream.Option {
opts := []stream.Option{stream.WithCallbackParallel(1)}
if cfg.blockSize != 0 {
opts = append(opts, stream.WithFlushBatchSize(cfg.blockSize))
}
if cfg.flushDelayTime != 0 {
opts = append(opts, stream.WithFlushDelayTime(cfg.flushDelayTime))
}
return opts
}
func defaultConfig() config {
cfg := config{
blockSize: defaultBlockSize,
fileSize: defaultFileSize,
}
return cfg
}
type Option func(*config)
func makeConfig(opts ...Option) config {
cfg := defaultConfig()
for _, opt := range opts {
opt(&cfg)
}
if cfg.engine == nil {
cfg.engine = defaultIOEngine()
}
return cfg
}
func FromPosition(pos int64) Option {
return func(cfg *config) {
cfg.pos = pos
}
}
func WithRecoveryCallback(cb OnEntryCallback) Option {
return func(cfg *config) {
cfg.cb = cb
}
}
func WithBlockSize(blockSize int) Option {
return func(cfg *config) {
cfg.blockSize = blockSize
}
}
func WithFileSize(fileSize int64) Option {
return func(cfg *config) {
cfg.fileSize = fileSize
}
}
func WithFlushDelayTime(d time.Duration) Option {
return func(cfg *config) {
cfg.flushDelayTime = d
}
}
func WithIOEngine(engine ioengine.Interface) Option {
return func(cfg *config) {
cfg.engine = engine
}
}
func WithReadOnly() Option {
return func(cfg *config) {
cfg.readOnly = true
}
}