status-go/peers/topic_peer_queue.go

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package peers
import (
"container/heap"
)
type peerInfoItem struct {
*peerInfo
index int
}
type peerPriorityQueue []*peerInfoItem
var _ heap.Interface = (*peerPriorityQueue)(nil)
func (q peerPriorityQueue) Len() int { return len(q) }
func (q peerPriorityQueue) Less(i, j int) bool {
return q[i].discoveredTime.After(q[j].discoveredTime)
}
func (q peerPriorityQueue) Swap(i, j int) {
q[i], q[j] = q[j], q[i]
q[i].index = i
q[j].index = j
}
func (q *peerPriorityQueue) Push(x interface{}) {
item := x.(*peerInfoItem)
item.index = len(*q)
*q = append(*q, item)
}
func (q *peerPriorityQueue) Pop() interface{} {
old := *q
n := len(old)
item := old[n-1]
item.index = -1
*q = old[0 : n-1]
return item
}