priority-queue - Retlang 中的通道输入优先级

Question

如何以优先方式处理通道输入？有什么等同于 Scala 的 " reactWithin(0) { ... case TIMEOUT }" 构造的吗？

Answer 1

我编写了一个订阅类，它在设定的时间间隔内传递优先消息。这不是使用优先消息的理想一般情况方式，但我会为后代发布它。我认为对于某些其他情况，自定义 RequestReplyChannel 会是更好的选择。PriorityQueue 的实现留给读者作为练习。

class PrioritySubscriber<T> : BaseSubscription<T>
{
    private readonly PriorityQueue<T> queue;
    private readonly IScheduler scheduler;
    private readonly Action<T> receive;
    private readonly int interval;

    private readonly object sync = new object();
    private ITimerControl next = null;

    public PrioritySubscriber(IComparer<T> comparer, IScheduler scheduler,
        Action<T> receive, int interval)
    {
        this.queue = new PriorityQueue<T>(comparer);
        this.scheduler = scheduler;
        this.receive = receive;
        this.interval = interval;
    }

    protected override void OnMessageOnProducerThread(T msg)
    {
        lock (this.sync)
        {
            this.queue.Enqueue(msg);

            if (this.next == null)
            {
                this.next =
                    this.scheduler.Schedule(this.Receive, this.interval);
            }
        }
    }

    private void Receive()
    {
        T msg;

        lock (this.sync)
        {
            msg = this.queue.Dequeue();

            if (this.queue.Count > 0)
            {
                this.next =
                    this.scheduler.Schedule(this.Receive, this.interval);
            }
        }

        this.receive(msg);
    }
}