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73 lines
1.2 KiB
Go
73 lines
1.2 KiB
Go
package main
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import (
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"container/heap"
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"time"
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)
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var queue = make(Queue, 0, 32)
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type Future struct {
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ts time.Time
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index int
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work func()
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}
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type Queue []*Future
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func (q Queue) Len() int { return len(q) }
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func (q Queue) Less(i, j int) bool {
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return q[i].ts.Before(q[j].ts)
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}
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func (q Queue) Swap(i, j int) {
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q[i], q[j] = q[j], q[i]
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q[i].index = j
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q[j].index = i
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}
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func (q *Queue) Push(v interface{}) {
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n := len(*q)
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future := v.(*Future)
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future.index = n
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*q = append(*q, future)
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}
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func (q *Queue) Pop() interface{} {
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old := *q
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n := len(old)
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future := old[n-1]
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future.index = -1
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*q = old[0 : n-1]
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return future
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}
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func At(ts time.Time, work func()) {
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heap.Push(&queue, &Future{ts: ts, work: work})
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}
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func After(delay time.Duration, work func()) {
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heap.Push(&queue, &Future{ts: time.Now().Add(delay), work: work})
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}
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func RunQueue() {
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defer log_info("Queue runner done.")
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heap.Init(&queue)
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for {
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if len(queue) == 0 {
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time.Sleep(10 * time.Microsecond)
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continue
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}
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future, ok := heap.Pop(&queue).(*Future)
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if !ok {
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log_error("there's shit on the work heap")
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continue
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}
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if future.ts.After(time.Now()) {
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time.Sleep(future.ts.Sub(time.Now()))
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}
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future.work()
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}
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}
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