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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package fuzzer
import (
"container/heap"
"github.com/algorand/go-algorand/protocol"
)
// PriorityQueue implements heap.Interface and holds QueueItem which contains an AlgoMessage.
// Derived from Priority Queue: https://golang.org/pkg/container/heap/
type AlgoMessage struct {
sourceNode int
targetNode int
tag protocol.Tag
data []byte
}
// QueueItem in the priority queue
type QueueItem struct {
priority int // The priority of the item in the queue.
// The index is needed by update and is maintained by the heap.Interface methods.
index int // The index of the item in the heap.
message AlgoMessage
}
// A PriorityQueue implements heap.Interface and holds Items.
type PriorityQueue []*QueueItem
func (pq PriorityQueue) Len() int { return len(pq) }
func (pq PriorityQueue) Less(i, j int) bool {
// We want Pop to give us the lowest, not highest, priority so we use less than here.
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)
item := x.(*QueueItem)
item.index = n
*pq = append(*pq, item)
}
func (pq *PriorityQueue) Pop() interface{} {
old := *pq
n := len(old)
item := old[n-1]
item.index = -1 // for safety
*pq = old[0 : n-1]
return item
}
// update modifies the priority and value of an Item in the queue.
func (pq *PriorityQueue) update(item *QueueItem, value AlgoMessage, priority int) {
item.message = value
item.priority = priority
heap.Fix(pq, item.index)
}
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