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rangelist.go
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rangelist.go
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package transfer
import (
"errors"
"fmt"
"github.com/qjfoidnh/BaiduPCS-Go/pcsutil/converter"
"sync"
"sync/atomic"
)
type (
//RangeList 请求范围列表
RangeList []*Range
//RangeListGen Range 生成器
RangeListGen struct {
total int64
begin int64
blockSize int64
parallel int
count int // 已生成次数
rangeGenMode RangeGenMode
mu sync.Mutex
}
)
const (
// DefaultBlockSize 默认的BlockSize
DefaultBlockSize = 256 * converter.KB
)
var (
// ErrUnknownRangeGenMode RangeGenMode 非法
ErrUnknownRangeGenMode = errors.New("Unknown RangeGenMode")
)
//Len 长度
func (r *Range) Len() int64 {
return r.LoadEnd() - r.LoadBegin()
}
//LoadBegin 读取Begin, 原子操作
func (r *Range) LoadBegin() int64 {
return atomic.LoadInt64(&r.Begin)
}
//AddBegin 增加Begin, 原子操作
func (r *Range) AddBegin(i int64) (newi int64) {
return atomic.AddInt64(&r.Begin, i)
}
//LoadEnd 读取End, 原子操作
func (r *Range) LoadEnd() int64 {
return atomic.LoadInt64(&r.End)
}
//StoreBegin 储存End, 原子操作
func (r *Range) StoreBegin(end int64) {
atomic.StoreInt64(&r.Begin, end)
}
//StoreEnd 储存End, 原子操作
func (r *Range) StoreEnd(end int64) {
atomic.StoreInt64(&r.End, end)
}
// ShowDetails 显示Range细节
func (r *Range) ShowDetails() string {
return fmt.Sprintf("{%d-%d}", r.LoadBegin(), r.LoadEnd())
}
//Len 获取所有的Range的剩余长度
func (rl *RangeList) Len() int64 {
var l int64
for _, wrange := range *rl {
if wrange == nil {
continue
}
l += wrange.Len()
}
return l
}
// NewRangeListGenDefault 初始化默认Range生成器, 根据parallel平均生成
func NewRangeListGenDefault(totalSize, begin int64, count, parallel int) *RangeListGen {
return &RangeListGen{
total: totalSize,
begin: begin,
parallel: parallel,
count: count,
rangeGenMode: RangeGenMode_Default,
}
}
// NewRangeListGenBlockSize 初始化Range生成器, 根据blockSize生成
func NewRangeListGenBlockSize(totalSize, begin, blockSize int64) *RangeListGen {
return &RangeListGen{
total: totalSize,
begin: begin,
blockSize: blockSize,
rangeGenMode: RangeGenMode_BlockSize,
}
}
// RangeGenMode 返回Range生成方式
func (gen *RangeListGen) RangeGenMode() RangeGenMode {
return gen.rangeGenMode
}
// RangeCount 返回预计生成的Range数量
func (gen *RangeListGen) RangeCount() (rangeCount int) {
switch gen.rangeGenMode {
case RangeGenMode_Default:
rangeCount = gen.parallel - gen.count
case RangeGenMode_BlockSize:
rangeCount = int((gen.total - gen.begin) / gen.blockSize)
if gen.total%gen.blockSize != 0 {
rangeCount++
}
}
return
}
// LoadBegin 返回begin
func (gen *RangeListGen) LoadBegin() (begin int64) {
gen.mu.Lock()
begin = gen.begin
gen.mu.Unlock()
return
}
// LoadBlockSize 返回blockSize
func (gen *RangeListGen) LoadBlockSize() (blockSize int64) {
switch gen.rangeGenMode {
case RangeGenMode_Default:
if gen.blockSize <= 0 {
gen.blockSize = (gen.total - gen.begin) / int64(gen.parallel)
}
blockSize = gen.blockSize
case RangeGenMode_BlockSize:
blockSize = gen.blockSize
}
return
}
// IsDone 是否已分配完成
func (gen *RangeListGen) IsDone() bool {
return gen.begin >= gen.total
}
// GenRange 生成 Range
func (gen *RangeListGen) GenRange() (index int, r *Range) {
var (
end int64
)
if gen.parallel < 1 {
gen.parallel = 1
}
switch gen.rangeGenMode {
case RangeGenMode_Default:
gen.LoadBlockSize()
gen.mu.Lock()
defer gen.mu.Unlock()
if gen.IsDone() {
return gen.count, nil
}
gen.count++
if gen.count >= gen.parallel {
end = gen.total
} else {
end = gen.begin + gen.blockSize
}
r = &Range{
Begin: gen.begin,
End: end,
}
gen.begin = end
index = gen.count - 1
return
case RangeGenMode_BlockSize:
if gen.blockSize <= 0 {
gen.blockSize = DefaultBlockSize
}
gen.mu.Lock()
defer gen.mu.Unlock()
if gen.IsDone() {
return gen.count, nil
}
gen.count++
end = gen.begin + gen.blockSize
if end >= gen.total {
end = gen.total
}
r = &Range{
Begin: gen.begin,
End: end,
}
gen.begin = end
index = gen.count - 1
return
}
return 0, nil
}