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impl.go
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impl.go
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package treesvc
import (
"sync"
"github.com/insolar/assured-ledger/ledger-core/conveyor/managed"
"github.com/insolar/assured-ledger/ledger-core/ledger/jet"
"github.com/insolar/assured-ledger/ledger-core/pulse"
"github.com/insolar/assured-ledger/ledger-core/vanilla/throw"
)
func NewEmpty() *LocalTree {
return &LocalTree{}
}
func NewPerfect(depth uint8, pn pulse.Number) *LocalTree {
tree := jet.NewPrefixTree(false)
tree.MakePerfect(depth)
return New(tree, pn)
}
func New(tree jet.PrefixTree, pn pulse.Number) *LocalTree {
if tree.IsEmpty() != pn.IsUnknown() {
panic(throw.IllegalValue())
}
return &LocalTree{
treePrev: tree,
treeCurr: tree,
treeNext: tree,
last: pn,
}
}
var _ Service = &LocalTree{}
var _ managed.ComponentWithPulse = &LocalTree{}
type LocalTree struct {
mutex sync.RWMutex
treePrev jet.PrefixTree
treeCurr jet.PrefixTree
treeNext jet.PrefixTree
last pulse.Number
genesisPN pulse.Number
postGenesis bool
}
func (p *LocalTree) Init(managed.Holder) {
p.mutex.Lock()
defer p.mutex.Unlock()
p.treePrev.Init()
p.treeCurr.Init()
p.treeNext.Init()
}
func (p *LocalTree) Start(managed.Holder) {
}
func (p *LocalTree) Stop(managed.Holder) {
}
func (p *LocalTree) PulseMigration(_ managed.Holder, pr pulse.Range) {
p.mutex.Lock()
defer p.mutex.Unlock()
switch pn := pr.RightBoundData().PulseNumber; {
case p.last >= pn:
if p.last == pn && p.isGenesis() {
// this is an exception for ahead-of-time genesis finish
break
}
panic(throw.IllegalValue())
case p.isGenesis():
// trees during genesis can only be switched explicitly
p.last = pn
return
default:
p.last = pn
}
if p.treeNext.IsEmpty() {
panic(throw.IllegalState())
}
p.treePrev, p.treeCurr = p.treeCurr, p.treeNext
}
func (p *LocalTree) TryLockGenesis(pn pulse.Number) bool {
p.mutex.Lock()
defer p.mutex.Unlock()
switch {
case !pn.IsTimePulse():
panic(throw.IllegalValue())
case !p.isGenesis():
return false
case !p.last.IsUnknown() && pn > p.last:
panic(throw.IllegalValue())
case !p.genesisPN.IsUnknown():
return false
}
p.genesisPN = pn
return true
}
func (p *LocalTree) GenesisPulse() pulse.Number {
p.mutex.RLock()
defer p.mutex.RUnlock()
return p.genesisPN
}
func (p *LocalTree) GetTrees(pn pulse.Number) (prev, cur jet.PrefixTree, ok bool) {
p.mutex.RLock()
defer p.mutex.RUnlock()
if p.isGenesis() || p.last.IsUnknownOrEqualTo(pn) {
return p.treePrev, p.treeCurr, true
}
return jet.PrefixTree{}, jet.PrefixTree{}, false
}
func (p *LocalTree) isGenesis() bool {
return !p.postGenesis
}
func (p *LocalTree) IsGenesisFinished() bool {
p.mutex.RLock()
defer p.mutex.RUnlock()
return p.postGenesis
}
func (p *LocalTree) FinishGenesis(depth uint8, lastGenesisPulse pulse.Number) {
p.mutex.Lock()
defer p.mutex.Unlock()
switch {
case !lastGenesisPulse.IsTimePulse():
panic(throw.IllegalValue())
case p.genesisPN > lastGenesisPulse:
panic(throw.IllegalValue())
case !p.isGenesis():
panic(throw.IllegalState())
}
p.treeNext.MakePerfect(depth)
switch {
case p.last < lastGenesisPulse:
// no pulses arrived yet or genesis will finish _after_ the given pulse
// so don't switch trees - wait for pulse
p.last = lastGenesisPulse
case p.last > lastGenesisPulse:
// this update is a bit late
// switch here
p.treePrev, p.treeCurr = p.treeCurr, p.treeNext
default:
// this pulse is current
// so don't switch trees - wait for pulse
}
if p.genesisPN.IsUnknown() {
p.genesisPN = lastGenesisPulse
}
p.postGenesis = true
}
func (p *LocalTree) SplitNext(id jet.DropID) {
p.mutex.Lock()
defer p.mutex.Unlock()
switch {
case p.treeCurr.IsEmpty():
// operation is not allowed until pulse is changed after genesis
panic(throw.IllegalState())
case id.CreatedAt() != p.last: // make sure that changes are actual
panic(throw.IllegalValue())
}
pfx, pln := p.treeCurr.GetPrefix(id.ID().AsPrefix()) // get current prefix of the jet
p.treeNext.Split(pfx, pln) // this can only be applied once - guarantees that jet can only be split once per pulse
}