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Add non-blocking "TryDequeue" function in queue lib #11

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Nov 6, 2023
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Add non-blocking "TryDequeue" function in queue lib #11

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17 changes: 17 additions & 0 deletions queue/queue.go
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,23 @@ func (q *Queue[T]) Dequeue() (val T, ok bool) {
return item, true
}

// TryDequeue removes an item from the front of the queue, similar to Dequeue.
//
// However, TryDequeue does NOT block if the queue is empty. It returns second value as false immediately if the queue is empty or closed.
func (q *Queue[T]) TryDequeue() (val T, ok bool) {
q.mu.Lock()
defer q.mu.Unlock()

if q.isClosed || len(q.items) == 0 {
return val, false
}

item := q.items[0]
q.items = q.items[1:]

return item, true
}

// IsEmpty returns true if the queue is empty.
func (q *Queue[T]) IsEmpty() bool {
q.mu.RLock()
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