func New(wd string, ss Strategizer, gro ...GrabberOption) (*Grabber, error) {
if wd == "" {
return nil, MissingWorkDirError
}
mx := new(sync.RWMutex)
g := &Grabber{
wd: wd,
s: ss,
writeState: mx,
readState: mx.RLocker(),
qIn: make(chan Segmenter, 100), // TODO(negz): Determine best buffer len.
qOut: make(chan Segmenter, 100),
maxRetry: 3,
doneMx: new(sync.Mutex),
pp: make(chan bool),
decoder: yenc.NewDecoder, // TODO(negz): Detect encoding.
fileCreator: createSegmentFile,
grabT: new(tomb.Tomb),
enqueueT: new(tomb.Tomb),
}
for _, o := range gro {
if err := o(g); err != nil {
return nil, err
}
}
if g.name == "" {
return nil, MissingNameError
}
g.hash = util.HashString(g.name)
return g, nil
}
func NewSegment(ns *nzb.Segment, f Filer) Segmenter {
mx := new(sync.RWMutex)
return &Segment{
ns: ns,
f: f,
writeState: mx,
readState: mx.RLocker(),
failedServer: make(map[Serverer]bool),
failedGroup: make(map[string]bool),
}
}
func BenchmarkMtxBlock(b *testing.B) {
var primer int64
m := new(sync.RWMutex)
c := sync.NewCond(m.RLocker())
die := make(chan struct{})
for i := 0; i < runtime.GOMAXPROCS(0); i++ {
go func() {
for {
select {
case <-die:
return
default:
// Gosched doubles as our item of work, as above.
runtime.Gosched()
}
m.Lock()
atomic.AddInt64(&primer, 1)
c.Broadcast()
m.Unlock()
}
}()
}
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
myPrimer := atomic.LoadInt64(&primer)
for {
m.RLock()
if myPrimer != primer {
m.RUnlock()
break
}
c.Wait()
m.RUnlock()
}
}
})
close(die)
}
func NewFile(nf *nzb.File, g Grabberer, filter ...*regexp.Regexp) Filer {
mx := new(sync.RWMutex)
f := &File{
nf: nf,
g: g,
hash: util.HashString(nf.Subject),
segments: make([]Segmenter, 0, len(nf.Segments)),
writeState: mx,
readState: mx.RLocker(),
doneMx: new(sync.Mutex),
required: true,
}
for _, ns := range nf.Segments {
f.segments = append(f.segments, NewSegment(ns, f))
}
if par2RE.MatchString(nf.Subject) {
f.par2 = true
f.required = false
f.Pause()
}
for _, r := range filter {
if r.MatchString(nf.Subject) {
f.filtered = true
f.required = false
f.Pause()
}
}
if f.required {
f.g.FileRequired()
}
return f
}
