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52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package restorer
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// packHeap is a heap of packInfo references
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// @see https://golang.org/pkg/container/heap/
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// @see https://en.wikipedia.org/wiki/Heap_(data_structure)
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type packHeap struct {
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elements []*packInfo
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// returns true if download of any of the files is in progress
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inprogress func(files map[*fileInfo]struct{}) bool
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}
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func (pq *packHeap) Len() int { return len(pq.elements) }
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func (pq *packHeap) Less(a, b int) bool {
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packA, packB := pq.elements[a], pq.elements[b]
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ap := pq.inprogress(packA.files)
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bp := pq.inprogress(packB.files)
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if ap && !bp {
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return true
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}
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if packA.cost < packB.cost {
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return true
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}
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return false
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}
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func (pq *packHeap) Swap(i, j int) {
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pq.elements[i], pq.elements[j] = pq.elements[j], pq.elements[i]
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pq.elements[i].index = i
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pq.elements[j].index = j
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}
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func (pq *packHeap) Push(x interface{}) {
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n := len(pq.elements)
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item := x.(*packInfo)
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item.index = n
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pq.elements = append(pq.elements, item)
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}
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func (pq *packHeap) Pop() interface{} {
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old := pq.elements
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n := len(old)
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item := old[n-1]
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item.index = -1 // for safety
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pq.elements = old[0 : n-1]
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return item
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}
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