| /* |
| * 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 sdcommon |
| |
| import ( |
| "context" |
| "sync" |
| |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| "github.com/go-chassis/foundation/gopool" |
| ) |
| |
| type EventBus struct { |
| Cfg ListWatchConfig |
| Lw ListWatch |
| Bus chan *ListWatchResp |
| stopCh chan struct{} |
| stop bool |
| mux sync.Mutex |
| } |
| |
| func (w *EventBus) ResourceEventBus() <-chan *ListWatchResp { |
| return w.Bus |
| } |
| |
| func (w *EventBus) process(_ context.Context) { |
| stopCh := make(chan struct{}) |
| ctx, cancel := context.WithTimeout(w.Cfg.Context, w.Cfg.Timeout) |
| gopool.Go(func(_ context.Context) { |
| defer close(stopCh) |
| _ = w.Lw.DoWatch(ctx, w.sendEvent) |
| }) |
| |
| select { |
| case <-stopCh: |
| // timed out or exception |
| w.Stop() |
| cancel() |
| case <-w.stopCh: |
| cancel() |
| } |
| |
| } |
| |
| func (w *EventBus) sendEvent(resp *ListWatchResp) { |
| defer log.Recover() |
| w.Bus <- resp |
| } |
| |
| func (w *EventBus) Stop() { |
| w.mux.Lock() |
| if w.stop { |
| w.mux.Unlock() |
| return |
| } |
| w.stop = true |
| close(w.stopCh) |
| close(w.Bus) |
| w.mux.Unlock() |
| } |
| |
| func NewEventBus(lw ListWatch, cfg ListWatchConfig) *EventBus { |
| w := &EventBus{ |
| Cfg: cfg, |
| Lw: lw, |
| Bus: make(chan *ListWatchResp, EventBusSize), |
| stopCh: make(chan struct{}), |
| } |
| gopool.Go(w.process) |
| return w |
| } |