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smdirtyreader.go
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/
smdirtyreader.go
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package datawriter
import (
"github.com/insolar/assured-ledger/ledger-core/conveyor/smachine"
"github.com/insolar/assured-ledger/ledger-core/ledger/jet"
"github.com/insolar/assured-ledger/ledger-core/ledger/server/buildersvc"
"github.com/insolar/assured-ledger/ledger-core/ledger/server/buildersvc/bundle"
"github.com/insolar/assured-ledger/ledger-core/ledger/server/dataextractor"
"github.com/insolar/assured-ledger/ledger-core/ledger/server/lineage"
"github.com/insolar/assured-ledger/ledger-core/reference"
"github.com/insolar/assured-ledger/ledger-core/vanilla/injector"
"github.com/insolar/assured-ledger/ledger-core/vanilla/throw"
)
func NewDirtyReader(cfg dataextractor.Config) smachine.SubroutineStateMachine {
cfg.Ensure()
return &SubSMDirtyReader{cfg: cfg}
}
var _ smachine.SubroutineStateMachine = &SubSMDirtyReader{}
type SubSMDirtyReader struct {
smachine.StateMachineDeclTemplate
// input
cfg dataextractor.Config
// injected
cataloger LineCataloger
reader buildersvc.ReadAdapter
// runtime
sdl LineDataLink
dropID jet.DropID
selfRef reference.Local
sequence dirtyIterator
}
func (p *SubSMDirtyReader) GetStateMachineDeclaration() smachine.StateMachineDeclaration {
return p
}
func (p *SubSMDirtyReader) InjectDependencies(_ smachine.StateMachine, _ smachine.SlotLink, injector injector.DependencyInjector) {
injector.MustInject(&p.cataloger)
injector.MustInject(&p.reader)
}
func (p *SubSMDirtyReader) GetSubroutineInitState(smachine.SubroutineStartContext) smachine.InitFunc {
return p.stepInit
}
func (p *SubSMDirtyReader) GetInitStateFor(smachine.StateMachine) smachine.InitFunc {
return p.stepInit
}
func (p *SubSMDirtyReader) stepInit(ctx smachine.InitializationContext) smachine.StateUpdate {
// switch {
// case p.request.TargetStartRef.IsEmpty():
// return ctx.Error(throw.E("missing target"))
// case p.request.Flags != 0:
// panic(throw.NotImplemented())
// }
//
// if tpn := p.request.TargetStartRef.Get().GetLocal().Pulse(); tpn != p.pn {
// return ctx.Error(throw.E("wrong target pulse", struct { TargetPN, SlotPN pulse.Number }{ tpn, p.pn}))
// }
// p.request.LimitCount
// p.request.LimitSize
// p.request.LimitRef
// p.request.Flags
switch notReason, selectorRef := p.cfg.Selector.GetSelectorRef(); {
case notReason:
p.selfRef = reference.NormCopy(selectorRef).GetBase()
default:
panic(throw.NotImplemented())
}
return ctx.Jump(p.stepFindLine)
}
func (p *SubSMDirtyReader) stepFindLine(ctx smachine.ExecutionContext) smachine.StateUpdate {
if p.sdl.IsZero() {
lineRef := reference.NewSelf(p.selfRef)
p.sdl = p.cataloger.Get(ctx, lineRef)
if p.sdl.IsZero() {
// line is absent
return ctx.Jump(p.stepResponse)
}
}
var activator smachine.SyncLink
switch p.sdl.TryAccess(ctx, func(sd *LineSharedData) (wakeup bool) {
activator = sd.GetActiveSync()
return false
}) {
case smachine.Passed:
//
case smachine.NotPassed:
return ctx.WaitShared(p.sdl.SharedDataLink).ThenRepeat()
default:
panic(throw.IllegalState())
}
if ctx.Acquire(activator) {
ctx.ReleaseAll()
return ctx.Jump(p.stepLineIsReady)
}
return ctx.Sleep().ThenJump(func(ctx smachine.ExecutionContext) smachine.StateUpdate {
if ctx.Acquire(activator) {
ctx.ReleaseAll()
return ctx.Jump(p.stepLineIsReady)
}
return ctx.Sleep().ThenRepeat()
})
}
func (p *SubSMDirtyReader) stepLineIsReady(ctx smachine.ExecutionContext) smachine.StateUpdate {
var future *buildersvc.Future
valid := false
switch p.sdl.TryAccess(ctx, func(sd *LineSharedData) (wakeup bool) {
if !sd.IsValidForRead() {
return
}
valid = true
p.dropID = sd.DropID()
sd.TrimStages()
_, future = p.findExpectedRecords(sd)
return false
}) {
case smachine.Passed:
//
case smachine.NotPassed:
return ctx.WaitShared(p.sdl.SharedDataLink).ThenRepeat()
default:
panic(throw.IllegalState())
}
switch {
case !valid:
return ctx.Jump(p.stepResponse)
case future == nil:
return ctx.Jump(p.stepPrepareDataWithReader)
}
ready := future.GetReadySync()
if ctx.Acquire(ready) {
ctx.ReleaseAll()
return ctx.Jump(p.stepDataIsReady)
}
return ctx.Sleep().ThenJump(func(ctx smachine.ExecutionContext) smachine.StateUpdate {
if ctx.Acquire(ready) {
ctx.ReleaseAll()
return ctx.Jump(p.stepDataIsReady)
}
return ctx.Sleep().ThenRepeat()
})
}
func (p *SubSMDirtyReader) stepDataIsReady(ctx smachine.ExecutionContext) smachine.StateUpdate {
switch p.sdl.TryAccess(ctx, func(sd *LineSharedData) (wakeup bool) {
sd.TrimStages()
if _, future := p.findExpectedRecords(sd); future != nil {
panic(throw.Impossible())
}
return false
}) {
case smachine.Passed:
//
case smachine.NotPassed:
return ctx.WaitShared(p.sdl.SharedDataLink).ThenRepeat()
default:
panic(throw.IllegalState())
}
return ctx.Jump(p.stepPrepareDataWithReader)
}
func (p *SubSMDirtyReader) stepPrepareDataWithReader(ctx smachine.ExecutionContext) smachine.StateUpdate {
return p.reader.PrepareAsync(ctx, func(svc buildersvc.ReadService) smachine.AsyncResultFunc {
extractor := dataextractor.NewSequenceReader(&p.sequence, p.cfg.Limiter, p.cfg.Output)
err := svc.DropReadDirty(p.dropID, func(reader bundle.DirtyReader) error {
extractor.SetReader(reader)
return extractor.ReadAll()
})
return func(ctx smachine.AsyncResultContext) {
if err != nil {
panic(err)
}
ctx.WakeUp()
}
}).DelayedStart().Sleep().ThenJump(p.stepResponse)
}
func (p *SubSMDirtyReader) stepResponse(ctx smachine.ExecutionContext) smachine.StateUpdate {
return ctx.Stop()
}
func (p *SubSMDirtyReader) findExpectedRecords(sd *LineSharedData) (bool, *buildersvc.Future) {
// TODO do a few sub-cycles when too many record
lim := p.cfg.Limiter.Clone()
return sd.FindSequence(p.cfg.Selector, func(record lineage.ReadRecord) bool {
lim.Next(0, record.RecRef)
if lim.CanRead() {
p.sequence.addExpected(record.StorageIndex)
return false
}
return true
})
}