| /* |
| * 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 queue |
| |
| import ( |
| "context" |
| "fmt" |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| ) |
| |
| type UniQueue struct { |
| queue chan interface{} |
| } |
| |
| func (uq *UniQueue) Get(ctx context.Context) interface{} { |
| select { |
| case <-ctx.Done(): |
| return nil |
| case item := <-uq.queue: |
| return item |
| } |
| } |
| |
| func (uq *UniQueue) Chan() <-chan interface{} { |
| return uq.queue |
| } |
| |
| func (uq *UniQueue) Put(value interface{}) (e error) { |
| defer func() { |
| if r := recover(); r != nil { |
| log.LogPanic(r) |
| |
| e = fmt.Errorf("%v", r) |
| } |
| }() |
| |
| select { |
| case _, ok := <-uq.queue: |
| if !ok { |
| return fmt.Errorf("channel is closed") |
| } |
| default: |
| } |
| |
| select { |
| case uq.queue <- value: |
| default: |
| } |
| return |
| } |
| |
| func (uq *UniQueue) Close() { |
| select { |
| case _, ok := <-uq.queue: |
| if !ok { |
| return |
| } |
| default: |
| } |
| close(uq.queue) |
| } |
| |
| func NewUniQueue() (uq *UniQueue) { |
| return &UniQueue{ |
| queue: make(chan interface{}, 1), |
| } |
| } |