| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 internal |
| |
| import ( |
| "time" |
| ) |
| |
| // Backoff |
| type Backoff struct { |
| backoff time.Duration |
| } |
| |
| const ( |
| minBackoff = 100 * time.Millisecond |
| maxBackoff = 60 * time.Second |
| ) |
| |
| // Next |
| func (b *Backoff) Next() time.Duration { |
| // Double the delay each time |
| b.backoff += b.backoff |
| if b.backoff.Nanoseconds() < minBackoff.Nanoseconds() { |
| b.backoff = minBackoff |
| } else if b.backoff.Nanoseconds() > maxBackoff.Nanoseconds() { |
| b.backoff = maxBackoff |
| } |
| |
| return b.backoff |
| } |