| // Copyright 2017 Istio 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 queue |
| |
| import ( |
| "fmt" |
| "time" |
| ) |
| |
| // WaitForClose blocks until the Instance has stopped processing tasks or the timeout expires. |
| // If the timeout is zero, it will wait until the queue is done processing. |
| // WaitForClose an error if the timeout expires. |
| func WaitForClose(q Instance, timeout time.Duration) error { |
| closed := q.Closed() |
| if timeout == 0 { |
| <-closed |
| return nil |
| } |
| timer := time.NewTimer(timeout) |
| defer timer.Stop() |
| select { |
| case <-closed: |
| return nil |
| case <-timer.C: |
| return fmt.Errorf("timeout waiting for queue to close after %v", timeout) |
| } |
| } |