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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core library is free software: you can redistribute it
// and/or modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// The dexon-consensus-core library is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.
package core
import (
"fmt"
"sync"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
)
type blockConfirmedEvent struct {
block *types.Block
}
type stronglyAckedEvent struct {
blockHash common.Hash
}
type totalOrderingDeliverEvent struct {
blockHashes common.Hashes
early bool
}
type deliverBlockEvent struct {
blockHash common.Hash
timestamp time.Time
}
type witnessAckEvent struct {
witnessAck *types.WitnessAck
}
// nonBlockingApplication implements Application and is a decorator for
// Application that makes the methods to be non-blocking.
type nonBlockingApplication struct {
app Application
eventChan chan interface{}
events []interface{}
eventsChange *sync.Cond
running sync.WaitGroup
}
func newNonBlockingApplication(app Application) *nonBlockingApplication {
nonBlockingApp := &nonBlockingApplication{
app: app,
eventChan: make(chan interface{}, 6),
events: make([]interface{}, 0, 100),
eventsChange: sync.NewCond(&sync.Mutex{}),
}
go nonBlockingApp.run()
return nonBlockingApp
}
func (app *nonBlockingApplication) addEvent(event interface{}) {
app.eventsChange.L.Lock()
defer app.eventsChange.L.Unlock()
app.events = append(app.events, event)
app.eventsChange.Broadcast()
}
func (app *nonBlockingApplication) run() {
// This go routine consume the first event from events and call the
// corresponding method of app.
for {
var event interface{}
func() {
app.eventsChange.L.Lock()
defer app.eventsChange.L.Unlock()
for len(app.events) == 0 {
app.eventsChange.Wait()
}
event = app.events[0]
app.events = app.events[1:]
app.running.Add(1)
}()
switch e := event.(type) {
case stronglyAckedEvent:
app.app.StronglyAcked(e.blockHash)
case blockConfirmedEvent:
app.app.BlockConfirmed(e.block)
case totalOrderingDeliverEvent:
app.app.TotalOrderingDeliver(e.blockHashes, e.early)
case deliverBlockEvent:
app.app.DeliverBlock(e.blockHash, e.timestamp)
case witnessAckEvent:
app.app.WitnessAckDeliver(e.witnessAck)
default:
fmt.Printf("Unknown event %v.", e)
}
app.running.Done()
app.eventsChange.Broadcast()
}
}
// wait will wait for all event in events finishes.
func (app *nonBlockingApplication) wait() {
app.eventsChange.L.Lock()
defer app.eventsChange.L.Unlock()
for len(app.events) > 0 {
app.eventsChange.Wait()
}
app.running.Wait()
}
// PreparePayload cannot be non-blocking.
func (app *nonBlockingApplication) PreparePayload(
position types.Position) []byte {
return app.app.PreparePayload(position)
}
// VerifyPayloads cannot be non-blocking.
func (app *nonBlockingApplication) VerifyPayloads(payloads []byte) bool {
return app.app.VerifyPayloads(payloads)
}
// BlockConfirmed is called when a block is confirmed and added to lattice.
func (app *nonBlockingApplication) BlockConfirmed(block *types.Block) {
app.addEvent(blockConfirmedEvent{block})
}
// StronglyAcked is called when a block is strongly acked.
func (app *nonBlockingApplication) StronglyAcked(blockHash common.Hash) {
app.addEvent(stronglyAckedEvent{blockHash})
}
// TotalOrderingDeliver is called when the total ordering algorithm deliver
// a set of block.
func (app *nonBlockingApplication) TotalOrderingDeliver(
blockHashes common.Hashes, early bool) {
app.addEvent(totalOrderingDeliverEvent{blockHashes, early})
}
// DeliverBlock is called when a block is add to the compaction chain.
func (app *nonBlockingApplication) DeliverBlock(
blockHash common.Hash, timestamp time.Time) {
app.addEvent(deliverBlockEvent{blockHash, timestamp})
}
// WitnessAckDeliver is called when a witness ack is created.
func (app *nonBlockingApplication) WitnessAckDeliver(witnessAck *types.WitnessAck) {
app.addEvent(witnessAckEvent{witnessAck})
}
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