1 /* 2 Copyright 2015 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 podautoscaler 18 19 import ( 20 "time" 21 22 "k8s.io/client-go/util/workqueue" 23 ) 24 25 // FixedItemIntervalRateLimiter limits items to a fixed-rate interval 26 type FixedItemIntervalRateLimiter struct { 27 interval time.Duration 28 } 29 30 var _ workqueue.RateLimiter = &FixedItemIntervalRateLimiter{} 31 32 // NewFixedItemIntervalRateLimiter creates a new instance of a RateLimiter using a fixed interval 33 func NewFixedItemIntervalRateLimiter(interval time.Duration) workqueue.RateLimiter { 34 return &FixedItemIntervalRateLimiter{ 35 interval: interval, 36 } 37 } 38 39 // When returns the interval of the rate limiter 40 func (r *FixedItemIntervalRateLimiter) When(item interface{}) time.Duration { 41 return r.interval 42 } 43 44 // NumRequeues returns back how many failures the item has had 45 func (r *FixedItemIntervalRateLimiter) NumRequeues(item interface{}) int { 46 return 1 47 } 48 49 // Forget indicates that an item is finished being retried. 50 func (r *FixedItemIntervalRateLimiter) Forget(item interface{}) { 51 } 52 53 // NewDefaultHPARateLimiter creates a rate limiter which limits overall (as per the 54 // default controller rate limiter), as well as per the resync interval 55 func NewDefaultHPARateLimiter(interval time.Duration) workqueue.RateLimiter { 56 return NewFixedItemIntervalRateLimiter(interval) 57 } 58