38 lines
680 B
Go
38 lines
680 B
Go
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// Copyright (c) 2013 CloudFlare, Inc.
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// This code is based on golang example from "container/heap" package.
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package lrucache
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type priorityQueue []*entry
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func (pq priorityQueue) Len() int {
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return len(pq)
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}
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func (pq priorityQueue) Less(i, j int) bool {
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return pq[i].expire.Before(pq[j].expire)
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}
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func (pq priorityQueue) Swap(i, j int) {
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pq[i], pq[j] = pq[j], pq[i]
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pq[i].index = i
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pq[j].index = j
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}
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func (pq *priorityQueue) Push(e interface{}) {
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n := len(*pq)
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item := e.(*entry)
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item.index = n
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*pq = append(*pq, item)
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}
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func (pq *priorityQueue) Pop() interface{} {
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old := *pq
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n := len(old)
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item := old[n-1]
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item.index = -1
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*pq = old[0 : n-1]
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return item
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}
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