| /* |
| * 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 sd |
| |
| import ( |
| "sync" |
| |
| "github.com/apache/servicecomb-service-center/pkg/log" |
| "github.com/apache/servicecomb-service-center/pkg/util" |
| ) |
| |
| var ( |
| eventProxies = make(map[Type]*KvEventProxy) |
| ) |
| |
| type KvEventProxy struct { |
| evtHandleFuncs []KvEventFunc |
| lock sync.RWMutex |
| } |
| |
| func (h *KvEventProxy) AddHandleFunc(f KvEventFunc) { |
| h.lock.Lock() |
| h.evtHandleFuncs = append(h.evtHandleFuncs, f) |
| h.lock.Unlock() |
| } |
| |
| func (h *KvEventProxy) OnEvent(evt KvEvent) { |
| h.lock.RLock() |
| for _, f := range h.evtHandleFuncs { |
| f(evt) |
| } |
| h.lock.RUnlock() |
| } |
| |
| // InjectConfig will inject a resource changed event callback function in Config |
| func (h *KvEventProxy) InjectConfig(cfg *Config) *Config { |
| return cfg.AppendEventFunc(h.OnEvent) |
| } |
| |
| // unsafe |
| func EventProxy(t Type) *KvEventProxy { |
| proxy, ok := eventProxies[t] |
| if !ok { |
| proxy = &KvEventProxy{} |
| eventProxies[t] = proxy |
| } |
| return proxy |
| } |
| |
| // the event handler/func must be good performance, or will block the event bus. |
| func AddEventHandleFunc(t Type, f KvEventFunc) { |
| EventProxy(t).AddHandleFunc(f) |
| log.Infof("register event handle function[%s] %s", t, util.FuncName(f)) |
| } |
| |
| func AddEventHandler(h KvEventHandler) { |
| EventProxy(h.Type()).AddHandleFunc(h.OnEvent) |
| log.Infof("register event handler[%s] %s", h.Type(), util.Reflect(h).Name()) |
| } |