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queue.go
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queue.go
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package queue
import (
"runtime"
"sync"
"sync/atomic"
"time"
"github.com/sjclijie/go-zero/core/logx"
"github.com/sjclijie/go-zero/core/rescue"
"github.com/sjclijie/go-zero/core/stat"
"github.com/sjclijie/go-zero/core/threading"
"github.com/sjclijie/go-zero/core/timex"
)
const queueName = "queue"
type (
Queue struct {
name string
metrics *stat.Metrics
producerFactory ProducerFactory
producerRoutineGroup *threading.RoutineGroup
consumerFactory ConsumerFactory
consumerRoutineGroup *threading.RoutineGroup
producerCount int
consumerCount int
active int32
channel chan string
quit chan struct{}
listeners []Listener
eventLock sync.Mutex
eventChannels []chan interface{}
}
Listener interface {
OnPause()
OnResume()
}
Poller interface {
Name() string
Poll() string
}
Pusher interface {
Name() string
Push(string) error
}
)
func NewQueue(producerFactory ProducerFactory, consumerFactory ConsumerFactory) *Queue {
queue := &Queue{
metrics: stat.NewMetrics(queueName),
producerFactory: producerFactory,
producerRoutineGroup: threading.NewRoutineGroup(),
consumerFactory: consumerFactory,
consumerRoutineGroup: threading.NewRoutineGroup(),
producerCount: runtime.NumCPU(),
consumerCount: runtime.NumCPU() << 1,
channel: make(chan string),
quit: make(chan struct{}),
}
queue.SetName(queueName)
return queue
}
func (queue *Queue) AddListener(listener Listener) {
queue.listeners = append(queue.listeners, listener)
}
func (queue *Queue) Broadcast(message interface{}) {
go func() {
queue.eventLock.Lock()
defer queue.eventLock.Unlock()
for _, channel := range queue.eventChannels {
channel <- message
}
}()
}
func (queue *Queue) SetName(name string) {
queue.name = name
queue.metrics.SetName(name)
}
func (queue *Queue) SetNumConsumer(count int) {
queue.consumerCount = count
}
func (queue *Queue) SetNumProducer(count int) {
queue.producerCount = count
}
func (queue *Queue) Start() {
queue.startProducers(queue.producerCount)
queue.startConsumers(queue.consumerCount)
queue.producerRoutineGroup.Wait()
close(queue.channel)
queue.consumerRoutineGroup.Wait()
}
func (queue *Queue) Stop() {
close(queue.quit)
}
func (queue *Queue) consume(eventChan chan interface{}) {
var consumer Consumer
for {
var err error
if consumer, err = queue.consumerFactory(); err != nil {
logx.Errorf("Error on creating consumer: %v", err)
time.Sleep(time.Second)
} else {
break
}
}
for {
select {
case message, ok := <-queue.channel:
if ok {
queue.consumeOne(consumer, message)
} else {
logx.Info("Task channel was closed, quitting consumer...")
return
}
case event := <-eventChan:
consumer.OnEvent(event)
}
}
}
func (queue *Queue) consumeOne(consumer Consumer, message string) {
threading.RunSafe(func() {
startTime := timex.Now()
defer func() {
duration := timex.Since(startTime)
queue.metrics.Add(stat.Task{
Duration: duration,
})
logx.WithDuration(duration).Infof("%s", message)
}()
if err := consumer.Consume(message); err != nil {
logx.Errorf("Error occurred while consuming %v: %v", message, err)
}
})
}
func (queue *Queue) pause() {
for _, listener := range queue.listeners {
listener.OnPause()
}
}
func (queue *Queue) produce() {
var producer Producer
for {
var err error
if producer, err = queue.producerFactory(); err != nil {
logx.Errorf("Error on creating producer: %v", err)
time.Sleep(time.Second)
} else {
break
}
}
atomic.AddInt32(&queue.active, 1)
producer.AddListener(routineListener{
queue: queue,
})
for {
select {
case <-queue.quit:
logx.Info("Quitting producer")
return
default:
if v, ok := queue.produceOne(producer); ok {
queue.channel <- v
}
}
}
}
func (queue *Queue) produceOne(producer Producer) (string, bool) {
// avoid panic quit the producer, just log it and continue
defer rescue.Recover()
return producer.Produce()
}
func (queue *Queue) resume() {
for _, listener := range queue.listeners {
listener.OnResume()
}
}
func (queue *Queue) startConsumers(number int) {
for i := 0; i < number; i++ {
eventChan := make(chan interface{})
queue.eventLock.Lock()
queue.eventChannels = append(queue.eventChannels, eventChan)
queue.eventLock.Unlock()
queue.consumerRoutineGroup.Run(func() {
queue.consume(eventChan)
})
}
}
func (queue *Queue) startProducers(number int) {
for i := 0; i < number; i++ {
queue.producerRoutineGroup.Run(func() {
queue.produce()
})
}
}
type routineListener struct {
queue *Queue
}
func (rl routineListener) OnProducerPause() {
if atomic.AddInt32(&rl.queue.active, -1) <= 0 {
rl.queue.pause()
}
}
func (rl routineListener) OnProducerResume() {
if atomic.AddInt32(&rl.queue.active, 1) == 1 {
rl.queue.resume()
}
}