聊聊tunny的workerWrapper

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本文主要研究一下tunny的workerWrapper

workerWrapper

type workerWrapper struct {
	worker        Worker
	interruptChan chan struct{}

	// reqChan is NOT owned by this type, it is used to send requests for work.
	reqChan chan<- workRequest

	// closeChan can be closed in order to cleanly shutdown this worker.
	closeChan chan struct{}

	// closedChan is closed by the run() goroutine when it exits.
	closedChan chan struct{}
}

func newWorkerWrapper(
	reqChan chan<- workRequest,
	worker Worker,
) *workerWrapper {
	w := workerWrapper{
		worker:        worker,
		interruptChan: make(chan struct{}),
		reqChan:       reqChan,
		closeChan:     make(chan struct{}),
		closedChan:    make(chan struct{}),
	}

	go w.run()

	return &w
}
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workerWrapper包装了worker,定义了interruptChan、reqChan、closeChan、closedChan属性

interrupt

func (w *workerWrapper) interrupt() {
	close(w.interruptChan)
	w.worker.Interrupt()
}
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interrupt方法关闭w.interruptChan,执行w.worker.Interrupt()

run

func (w *workerWrapper) run() {
	jobChan, retChan := make(chan interface{}), make(chan interface{})
	defer func() {
		w.worker.Terminate()
		close(retChan)
		close(w.closedChan)
	}()

	for {
		// NOTE: Blocking here will prevent the worker from closing down.
		w.worker.BlockUntilReady()
		select {
		case w.reqChan <- workRequest{
			jobChan:       jobChan,
			retChan:       retChan,
			interruptFunc: w.interrupt,
		}:
			select {
			case payload := <-jobChan:
				result := w.worker.Process(payload)
				select {
				case retChan <- result:
				case <-w.interruptChan:
					w.interruptChan = make(chan struct{})
				}
			case _, _ = <-w.interruptChan:
				w.interruptChan = make(chan struct{})
			}
		case <-w.closeChan:
			return
		}
	}
}
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run首先创建jobChan、retChan,然后for循环执行select读取reqChan,之后读取jobChan的payload,进行处理,然后写入到retChan

stop

func (w *workerWrapper) stop() {
	close(w.closeChan)
}
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stop方法关闭w.closeChan

join

func (w *workerWrapper) join() {
	<-w.closedChan
}
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join方法则等待w.closedChan

小结

tunny的workerWrapper包装了worker,定义了interruptChan、reqChan、closeChan、closedChan属性,它提供了interrupt、run、stop、join方法。

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