mirror of
https://github.com/etcd-io/etcd.git
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102 lines
2.1 KiB
Go
102 lines
2.1 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package store
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import (
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"container/heap"
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)
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// An TTLKeyHeap is a min-heap of TTLKeys order by expiration time
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type ttlKeyHeap struct {
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array []*node
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keyMap map[*node]int
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}
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func newTtlKeyHeap() *ttlKeyHeap {
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h := &ttlKeyHeap{keyMap: make(map[*node]int)}
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heap.Init(h)
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return h
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}
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func (h ttlKeyHeap) Len() int {
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return len(h.array)
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}
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func (h ttlKeyHeap) Less(i, j int) bool {
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return h.array[i].ExpireTime.Before(h.array[j].ExpireTime)
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}
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func (h ttlKeyHeap) Swap(i, j int) {
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// swap node
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h.array[i], h.array[j] = h.array[j], h.array[i]
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// update map
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h.keyMap[h.array[i]] = i
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h.keyMap[h.array[j]] = j
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}
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func (h *ttlKeyHeap) Push(x interface{}) {
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n, _ := x.(*node)
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h.keyMap[n] = len(h.array)
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h.array = append(h.array, n)
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}
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func (h *ttlKeyHeap) Pop() interface{} {
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old := h.array
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n := len(old)
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x := old[n-1]
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// Set slice element to nil, so GC can recycle the node.
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// This is due to golang GC doesn't support partial recycling:
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// https://github.com/golang/go/issues/9618
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old[n-1] = nil
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h.array = old[0 : n-1]
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delete(h.keyMap, x)
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return x
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}
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func (h *ttlKeyHeap) top() *node {
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if h.Len() != 0 {
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return h.array[0]
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}
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return nil
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}
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func (h *ttlKeyHeap) pop() *node {
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x := heap.Pop(h)
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n, _ := x.(*node)
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return n
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}
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func (h *ttlKeyHeap) push(x interface{}) {
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heap.Push(h, x)
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}
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func (h *ttlKeyHeap) update(n *node) {
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index, ok := h.keyMap[n]
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if ok {
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heap.Remove(h, index)
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heap.Push(h, n)
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}
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}
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func (h *ttlKeyHeap) remove(n *node) {
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index, ok := h.keyMap[n]
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if ok {
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heap.Remove(h, index)
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}
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}
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