update: use oarkflow/json

queue.go

@@ -45,38 +45,33 @@ func (b *Broker) NewQueue(name string) *Queue {
 type QueueTask struct {
 	ctx        context.Context
 	payload    *Task
-	retryCount int
 	priority   int
-	index      int // The index in the heap
+	retryCount int
+	index      int
 }
 
 type PriorityQueue []*QueueTask
 
 func (pq PriorityQueue) Len() int { return len(pq) }
-
 func (pq PriorityQueue) Less(i, j int) bool {
 	return pq[i].priority > pq[j].priority
 }
-
 func (pq PriorityQueue) Swap(i, j int) {
 	pq[i], pq[j] = pq[j], pq[i]
 	pq[i].index = i
 	pq[j].index = j
 }
-
 func (pq *PriorityQueue) Push(x interface{}) {
 	n := len(*pq)
 	task := x.(*QueueTask)
 	task.index = n
 	*pq = append(*pq, task)
 }
-
 func (pq *PriorityQueue) Pop() interface{} {
 	old := *pq
 	n := len(old)
 	task := old[n-1]
-	old[n-1] = nil  // avoid memory leak
-	task.index = -1 // for safety
+	task.index = -1
 	*pq = old[0 : n-1]
 	return task
 }