forked from mirrors/ntfy
86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
package util
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// BatchingQueue is a queue that creates batches of the enqueued elements based on a
|
|
// max batch size and a batch timeout.
|
|
//
|
|
// Example:
|
|
//
|
|
// q := NewBatchingQueue[int](2, 500 * time.Millisecond)
|
|
// go func() {
|
|
// for batch := range q.Dequeue() {
|
|
// fmt.Println(batch)
|
|
// }
|
|
// }()
|
|
// q.Enqueue(1)
|
|
// q.Enqueue(2)
|
|
// q.Enqueue(3)
|
|
// time.Sleep(time.Second)
|
|
//
|
|
// This example will emit batch [1, 2] immediately (because the batch size is 2), and
|
|
// a batch [3] after 500ms.
|
|
type BatchingQueue[T any] struct {
|
|
batchSize int
|
|
timeout time.Duration
|
|
in []T
|
|
out chan []T
|
|
mu sync.Mutex
|
|
}
|
|
|
|
// NewBatchingQueue creates a new BatchingQueue
|
|
func NewBatchingQueue[T any](batchSize int, timeout time.Duration) *BatchingQueue[T] {
|
|
q := &BatchingQueue[T]{
|
|
batchSize: batchSize,
|
|
timeout: timeout,
|
|
in: make([]T, 0),
|
|
out: make(chan []T),
|
|
}
|
|
go q.timeoutTicker()
|
|
return q
|
|
}
|
|
|
|
// Enqueue enqueues an element to the queue. If the configured batch size is reached,
|
|
// the batch will be emitted immediately.
|
|
func (q *BatchingQueue[T]) Enqueue(element T) {
|
|
q.mu.Lock()
|
|
q.in = append(q.in, element)
|
|
var elements []T
|
|
if len(q.in) == q.batchSize {
|
|
elements = q.dequeueAll()
|
|
}
|
|
q.mu.Unlock()
|
|
if len(elements) > 0 {
|
|
q.out <- elements
|
|
}
|
|
}
|
|
|
|
// Dequeue returns a channel emitting batches of elements
|
|
func (q *BatchingQueue[T]) Dequeue() <-chan []T {
|
|
return q.out
|
|
}
|
|
|
|
func (q *BatchingQueue[T]) dequeueAll() []T {
|
|
elements := make([]T, len(q.in))
|
|
copy(elements, q.in)
|
|
q.in = q.in[:0]
|
|
return elements
|
|
}
|
|
|
|
func (q *BatchingQueue[T]) timeoutTicker() {
|
|
if q.timeout == 0 {
|
|
return
|
|
}
|
|
ticker := time.NewTicker(q.timeout)
|
|
for range ticker.C {
|
|
q.mu.Lock()
|
|
elements := q.dequeueAll()
|
|
q.mu.Unlock()
|
|
if len(elements) > 0 {
|
|
q.out <- elements
|
|
}
|
|
}
|
|
}
|