bobtthp commented on code in PR #2186: URL: https://github.com/apache/dubbo-go/pull/2186#discussion_r1082468070
########## registry/event/service_mapping_change_listener_impl.go: ########## @@ -0,0 +1,107 @@ +/* + * 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 ( + "sync" +) + +import ( + gxset "github.com/dubbogo/gost/container/set" + "github.com/dubbogo/gost/gof/observer" +) + +import ( + "dubbo.apache.org/dubbo-go/v3/common" + "dubbo.apache.org/dubbo-go/v3/common/constant" + "dubbo.apache.org/dubbo-go/v3/common/extension" + "dubbo.apache.org/dubbo-go/v3/registry" +) + +type ServiceMappingChangedListenerImpl struct { + oldServiceNames *gxset.HashSet + listener registry.NotifyListener + registryUrl *common.URL + serviceUrl *common.URL + mappingCache *sync.Map + stop int +} + +const ( + ServiceMappingListenerStart = iota + ServiceMappingListenerStop +) + +func NewMappingListener(registryUrl *common.URL, serviceUrl *common.URL, oldServiceNames *gxset.HashSet, listener registry.NotifyListener) *ServiceMappingChangedListenerImpl { + return &ServiceMappingChangedListenerImpl{ + listener: listener, + oldServiceNames: oldServiceNames, + registryUrl: registryUrl, + serviceUrl: serviceUrl, + stop: ServiceMappingListenerStart, + mappingCache: &sync.Map{}, + } +} + +// OnEvent on ServiceMappingChangedEvent the service mapping change event +func (lstn *ServiceMappingChangedListenerImpl) OnEvent(e observer.Event) error { + var ( + err error + reg registry.Registry + ) + if lstn.stop == ServiceMappingListenerStop { + return nil + } + sm, ok := e.(*registry.ServiceMappingChangeEvent) + if !ok { + return nil + } + newServiceNames := sm.GetServiceNames() + oldServiceNames := lstn.oldServiceNames + + // serviceMapping is orderly + if newServiceNames.Empty() || oldServiceNames.String() == newServiceNames.String() { + return nil + } + + if newServiceNames.Size() > 0 && oldServiceNames.Empty() { + if reg, err = extension.GetRegistry(constant.ServiceRegistryProtocol, lstn.registryUrl); err != nil { + return err + } + reg.SubscribeURL(lstn.serviceUrl, lstn.listener, newServiceNames) + lstn.oldServiceNames = newServiceNames + return nil + } + for _, app := range newServiceNames.Values() { + if !oldServiceNames.Contains(app) { + lstn.mappingCache.Delete(oldServiceNames.String()) Review Comment: 重复的不会删除，我的理解是注册的时候可以规避一下重复注册问题哈 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: notifications-unsubscr...@dubbo.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: notifications-unsubscr...@dubbo.apache.org For additional commands, e-mail: notifications-h...@dubbo.apache.org
