| /* |
| * 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 event |
| |
| import ( |
| "errors" |
| "fmt" |
| |
| "github.com/apache/servicecomb-service-center/pkg/event" |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| "github.com/apache/servicecomb-service-center/server/metrics" |
| ) |
| |
| var errBusy = errors.New("too busy") |
| |
| type InstanceSubscriber struct { |
| event.Subscriber |
| Job chan *InstanceEvent |
| } |
| |
| func (w *InstanceSubscriber) SetError(err error) { |
| w.Subscriber.SetError(err) |
| // 触发清理job |
| e := w.Bus().Fire(event.NewUnhealthyEvent(w)) |
| if e != nil { |
| log.Error("", e) |
| } |
| } |
| |
| func (w *InstanceSubscriber) OnAccept() { |
| if w.Err() != nil { |
| return |
| } |
| log.Debug(fmt.Sprintf("accepted by event service, %s watcher %s %s", w.Type(), w.Group(), w.Subject())) |
| } |
| |
| // 被通知 |
| func (w *InstanceSubscriber) OnMessage(evt event.Event) { |
| if w.Err() != nil { |
| return |
| } |
| |
| wJob, ok := evt.(*InstanceEvent) |
| if !ok { |
| return |
| } |
| w.sendMessage(wJob) |
| } |
| |
| func (w *InstanceSubscriber) sendMessage(evt *InstanceEvent) { |
| defer log.Recover() |
| |
| metrics.ReportPendingCompleted(evt) |
| |
| select { |
| case w.Job <- evt: |
| default: |
| log.Error(fmt.Sprintf("the %s watcher %s %s event queue is full, drop the blocked events", |
| w.Type(), w.Group(), w.Subject()), nil) |
| w.cleanup() |
| w.Job <- evt |
| } |
| } |
| |
| func (w *InstanceSubscriber) cleanup() { |
| for { |
| select { |
| case evt, ok := <-w.Job: |
| if !ok { |
| return |
| } |
| metrics.ReportPublishCompleted(evt, errBusy) |
| default: |
| return |
| } |
| } |
| } |
| |
| func (w *InstanceSubscriber) Close() { |
| w.cleanup() |
| close(w.Job) |
| } |
| |
| func NewInstanceSubscriber(serviceID, domainProject string) *InstanceSubscriber { |
| watcher := &InstanceSubscriber{ |
| Subscriber: event.NewSubscriber(INSTANCE, domainProject, serviceID), |
| Job: make(chan *InstanceEvent, INSTANCE.QueueSize()), |
| } |
| return watcher |
| } |