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dispatcher.go
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dispatcher.go
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package curlew
import (
"errors"
"os"
"runtime"
"sync"
"time"
"github.com/sirupsen/logrus"
)
// Dispatcher takes the responsibility of dispatching jobs to available workers.
type Dispatcher struct {
guard sync.RWMutex
MaxWorkerNum int // maximum worker num in the pool
MaxJobRunningTimeout time.Duration // job execution timeout
WorkerPool chan *Worker // worker pool
workers map[*Worker]struct{}
jobs chan *Job
runningWorkerNum int
monitor Monitor
logger *logrus.Logger
}
func defaultWorkerNum() int {
num := runtime.NumCPU()
if num <= 0 {
return 2
}
return 2 * num
}
// New creates a dispatcher instance.
func New(setters ...Setter) (*Dispatcher, error) {
d := Dispatcher{
MaxWorkerNum: defaultWorkerNum(),
MaxJobRunningTimeout: 10 * time.Second,
}
for _, setter := range setters {
if err := setter(&d); err != nil {
return nil, err
}
}
if d.MaxWorkerNum < 1 {
return nil, errors.New("must have at least one worker in the pool")
}
if d.monitor == nil {
return nil, errors.New("no monitor provided")
}
d.WorkerPool = make(chan *Worker, d.MaxWorkerNum)
d.workers = make(map[*Worker]struct{})
d.jobs = make(chan *Job, 1)
logger := logrus.New()
logger.SetFormatter(&logrus.JSONFormatter{
TimestampFormat: "2006-01-02 15:04:05",
})
logger.SetOutput(os.Stdout)
logger.SetLevel(logrus.InfoLevel)
d.logger = logger
d.dispatch()
return &d, nil
}
// EnableDebug enables debug info.
func (d *Dispatcher) EnableDebug() {
d.logger.SetLevel(logrus.DebugLevel)
}
// Submit submits a job.
func (d *Dispatcher) Submit(j *Job) {
if j == nil {
return
}
d.jobs <- j
}
// RunningWorkerNum returns the current running worker num.
func (d *Dispatcher) RunningWorkerNum() int {
d.guard.RLock()
defer d.guard.RUnlock()
return d.runningWorkerNum
}
func (d *Dispatcher) add(w *Worker) {
d.guard.Lock()
d.workers[w] = struct{}{}
d.runningWorkerNum++
d.guard.Unlock()
}
func (d *Dispatcher) remove(w *Worker) {
d.guard.Lock()
delete(d.workers, w)
d.runningWorkerNum--
d.guard.Unlock()
}
// NewWorker 生成一个工作协程
func (d *Dispatcher) NewWorker() *Worker {
w := newWorker(d)
d.add(w)
return w
}
func (d *Dispatcher) dispatch() {
go func() {
for j := range d.jobs {
select {
case w := <-d.WorkerPool:
d.logger.Debug("Worker is ready to submit a task.")
w.submit(j)
default:
if d.RunningWorkerNum() < d.MaxWorkerNum {
d.logger.Debug("Not reach limit yet, create a new worker to submit a task.")
d.NewWorker().submit(j)
} else {
w := <-d.WorkerPool
d.logger.Debug("Reach limit, wait a ready worker")
w.submit(j)
}
}
}
}()
}