mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
6f271d8bf1
This adds a heap acting as a priority queue to keep track of lease exiprations. Previously the whole lease map had to be iterated through each time. The queue allows us to check only those leases which might be expired. When the expiration changes, we add an additional entry. If we check an entry that isn't expired, it means that the lease got extended. If we find a entry in the heap that doesn't have a corresponding entry in the map, we know that the lease has already been expired or revoked.
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
// Copyright 2018 The etcd Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package lease
|
|
|
|
type LeaseWithTime struct {
|
|
leaseId LeaseID
|
|
expiration int64
|
|
index int
|
|
}
|
|
|
|
type LeaseQueue []*LeaseWithTime
|
|
|
|
func (pq LeaseQueue) Len() int { return len(pq) }
|
|
|
|
func (pq LeaseQueue) Less(i, j int) bool {
|
|
return pq[i].expiration < pq[j].expiration
|
|
}
|
|
|
|
func (pq LeaseQueue) Swap(i, j int) {
|
|
pq[i], pq[j] = pq[j], pq[i]
|
|
pq[i].index = i
|
|
pq[j].index = j
|
|
}
|
|
|
|
func (pq *LeaseQueue) Push(x interface{}) {
|
|
n := len(*pq)
|
|
item := x.(*LeaseWithTime)
|
|
item.index = n
|
|
*pq = append(*pq, item)
|
|
}
|
|
|
|
func (pq *LeaseQueue) Pop() interface{} {
|
|
old := *pq
|
|
n := len(old)
|
|
item := old[n-1]
|
|
item.index = -1 // for safety
|
|
*pq = old[0 : n-1]
|
|
return item
|
|
}
|