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subscribe_callback.go
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subscribe_callback.go
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/*
* Copyright 1999-2020 Alibaba Group Holding Ltd.
*
* 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 naming_cache
import (
"sync"
"github.com/nacos-group/nacos-sdk-go/v2/clients/cache"
"github.com/nacos-group/nacos-sdk-go/v2/common/logger"
"github.com/nacos-group/nacos-sdk-go/v2/model"
"github.com/nacos-group/nacos-sdk-go/v2/util"
)
type SubscribeCallback struct {
callbackFuncMap cache.ConcurrentMap
mux *sync.Mutex
}
func NewSubscribeCallback() *SubscribeCallback {
return &SubscribeCallback{callbackFuncMap: cache.NewConcurrentMap(), mux: new(sync.Mutex)}
}
func (ed *SubscribeCallback) IsSubscribed(serviceName, clusters string) bool {
key := util.GetServiceCacheKey(serviceName, clusters)
_, ok := ed.callbackFuncMap.Get(key)
return ok
}
func (ed *SubscribeCallback) AddCallbackFunc(serviceName string, clusters string, callbackFunc *func(services []model.Instance, err error)) {
key := util.GetServiceCacheKey(serviceName, clusters)
defer ed.mux.Unlock()
ed.mux.Lock()
var funcSlice []*func(services []model.Instance, err error)
old, ok := ed.callbackFuncMap.Get(key)
if ok {
funcSlice = append(funcSlice, old.([]*func(services []model.Instance, err error))...)
}
funcSlice = append(funcSlice, callbackFunc)
ed.callbackFuncMap.Set(key, funcSlice)
}
func (ed *SubscribeCallback) RemoveCallbackFunc(serviceName string, clusters string, callbackFunc *func(services []model.Instance, err error)) {
logger.Info("removing " + serviceName + " with " + clusters + " to listener map")
key := util.GetServiceCacheKey(serviceName, clusters)
funcs, ok := ed.callbackFuncMap.Get(key)
if ok && funcs != nil {
var newFuncs []*func(services []model.Instance, err error)
for _, funcItem := range funcs.([]*func(services []model.Instance, err error)) {
if funcItem != callbackFunc {
newFuncs = append(newFuncs, funcItem)
}
}
ed.callbackFuncMap.Set(key, newFuncs)
}
}
func (ed *SubscribeCallback) ServiceChanged(cacheKey string, service *model.Service) {
funcs, ok := ed.callbackFuncMap.Get(cacheKey)
if ok {
for _, funcItem := range funcs.([]*func(services []model.Instance, err error)) {
(*funcItem)(service.Hosts, nil)
}
}
}