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event.go
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event.go
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// Copyright 2016 ljy2010a
//
// 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 sentinel
import "sync"
type InstanceDetail struct {
Type string
Name string
Addr string
}
type eventHandler struct {
Event string
Ch chan InstanceDetail
close chan interface{}
HandlerFunc func(InstanceDetail)
}
func (e *eventHandler) Serve() {
for {
select {
case instance := <-e.Ch:
e.HandlerFunc(instance)
case <-e.close:
return
}
}
}
func (e *eventHandler) Close() {
close(e.close)
}
type eventServer struct {
handlers map[string]*eventHandler
mu sync.RWMutex
}
func newEventServer() *eventServer {
handlers := make(map[string]*eventHandler)
eventServer := &eventServer{
handlers: handlers,
}
return eventServer
}
func (e *eventServer) Add(event string, handlerFunc func(InstanceDetail)) {
e.mu.Lock()
defer e.mu.Unlock()
ch := make(chan InstanceDetail)
eventHandler := &eventHandler{
Ch: ch,
close: make(chan interface{}),
HandlerFunc: handlerFunc,
Event: event,
}
if old, ok := e.handlers[event]; ok {
old.Close()
}
e.handlers[event] = eventHandler
go eventHandler.Serve()
}
func (e *eventServer) Close() {
e.mu.Lock()
defer e.mu.Unlock()
for _, v := range e.handlers {
v.Close()
}
}
// func (e *eventServer) Get(event string) *eventHandler {
// e.mu.RLock()
// defer e.mu.RUnlock()
// if eventHandler, ok := e.handlers[event]; ok {
// return eventHandler
// }
// return nil
// }
func (e *eventServer) Push(event string, i InstanceDetail) {
e.mu.RLock()
defer e.mu.RUnlock()
if eventHandler, ok := e.handlers[event]; ok {
eventHandler.Ch <- i
}
}