k8s.io/apiserver@v0.31.1/pkg/util/flowcontrol/max_seats.go (about) 1 /* 2 Copyright 2023 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package flowcontrol 18 19 import ( 20 "sync" 21 ) 22 23 // MaxSeatsTracker is used to track max seats allocatable per priority level from the work estimator 24 type MaxSeatsTracker interface { 25 // GetMaxSeats returns the maximum seats a request should occupy for a given priority level. 26 GetMaxSeats(priorityLevelName string) uint64 27 28 // SetMaxSeats configures max seats for a priority level. 29 SetMaxSeats(priorityLevelName string, maxSeats uint64) 30 31 // ForgetPriorityLevel removes max seats tracking for a priority level. 32 ForgetPriorityLevel(priorityLevelName string) 33 } 34 35 type maxSeatsTracker struct { 36 sync.RWMutex 37 38 maxSeats map[string]uint64 39 } 40 41 func NewMaxSeatsTracker() MaxSeatsTracker { 42 return &maxSeatsTracker{ 43 maxSeats: make(map[string]uint64), 44 } 45 } 46 47 func (m *maxSeatsTracker) GetMaxSeats(plName string) uint64 { 48 m.RLock() 49 defer m.RUnlock() 50 51 return m.maxSeats[plName] 52 } 53 54 func (m *maxSeatsTracker) SetMaxSeats(plName string, maxSeats uint64) { 55 m.Lock() 56 defer m.Unlock() 57 58 m.maxSeats[plName] = maxSeats 59 } 60 61 func (m *maxSeatsTracker) ForgetPriorityLevel(plName string) { 62 m.Lock() 63 defer m.Unlock() 64 65 delete(m.maxSeats, plName) 66 }