| /* |
| * 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 servicediscovery |
| |
| import ( |
| "sync" |
| ) |
| |
| import ( |
| gxset "github.com/dubbogo/gost/container/set" |
| "github.com/dubbogo/gost/gof/observer" |
| "github.com/dubbogo/gost/log/logger" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/common" |
| "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 |
| |
| mux sync.Mutex |
| } |
| |
| 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 |
| ) |
| |
| lstn.mux.Lock() |
| defer lstn.mux.Unlock() |
| |
| 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(lstn.registryUrl.Protocol, lstn.registryUrl); err != nil { |
| return err |
| } |
| if sdreg, ok := reg.(*ServiceDiscoveryRegistry); ok { |
| sdreg.SubscribeURL(lstn.serviceUrl, lstn.listener, newServiceNames) |
| } |
| lstn.oldServiceNames = newServiceNames |
| return nil |
| } |
| for _, service := range newServiceNames.Values() { |
| if !oldServiceNames.Contains(service) { |
| logger.Infof("Service-application mapping changed for service: %s, new applications: %q, old applications: %q.", lstn.serviceUrl.ServiceKey(), oldServiceNames, newServiceNames) |
| lstn.mappingCache.Delete(oldServiceNames.String()) |
| lstn.mappingCache.Store(newServiceNames.String(), newServiceNames) |
| if reg, err = extension.GetRegistry(lstn.registryUrl.Protocol, lstn.registryUrl); err != nil { |
| return err |
| } |
| if sdreg, ok := reg.(*ServiceDiscoveryRegistry); ok { |
| sdreg.SubscribeURL(lstn.serviceUrl, lstn.listener, newServiceNames) |
| } |
| lstn.oldServiceNames = newServiceNames |
| break |
| } |
| } |
| |
| return err |
| } |
| |
| // Stop on ServiceMappingChangedEvent the service mapping change event |
| func (lstn *ServiceMappingChangedListenerImpl) Stop() { |
| lstn.stop = ServiceMappingListenerStop |
| } |