| /* |
| * 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 ( |
| "reflect" |
| "sync" |
| ) |
| |
| import ( |
| perrors "github.com/pkg/errors" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common/constant" |
| "github.com/apache/dubbo-go/common/extension" |
| "github.com/apache/dubbo-go/common/observer" |
| "github.com/apache/dubbo-go/metadata/mapping" |
| ) |
| |
| func init() { |
| extension.AddEventListener(GetServiceNameMappingListener) |
| } |
| |
| // serviceNameMappingListener listen to service name mapping event |
| // usually it means that we exported some service |
| // it's a singleton |
| type serviceNameMappingListener struct { |
| nameMapping mapping.ServiceNameMapping |
| } |
| |
| // GetPriority return 3, which ensure that this listener will be invoked after log listener |
| func (s *serviceNameMappingListener) GetPriority() int { |
| return 3 |
| } |
| |
| // OnEvent only handle ServiceConfigExportedEvent |
| func (s *serviceNameMappingListener) OnEvent(e observer.Event) error { |
| if ex, ok := e.(*ServiceConfigExportedEvent); ok { |
| sc := ex.ServiceConfig |
| urls := sc.GetExportedUrls() |
| |
| for _, u := range urls { |
| err := s.nameMapping.Map(u.GetParam(constant.INTERFACE_KEY, ""), |
| u.GetParam(constant.GROUP_KEY, ""), |
| u.GetParam(constant.Version, ""), |
| u.Protocol) |
| if err != nil { |
| return perrors.WithMessage(err, "could not map the service: "+u.String()) |
| } |
| } |
| } |
| return nil |
| } |
| |
| // GetEventType return ServiceConfigExportedEvent |
| func (s *serviceNameMappingListener) GetEventType() reflect.Type { |
| return reflect.TypeOf(&ServiceConfigExportedEvent{}) |
| } |
| |
| var ( |
| serviceNameMappingListenerInstance *serviceNameMappingListener |
| serviceNameMappingListenerOnce sync.Once |
| ) |
| |
| // GetServiceNameMappingListener returns an instance |
| func GetServiceNameMappingListener() observer.EventListener { |
| serviceNameMappingListenerOnce.Do(func() { |
| serviceNameMappingListenerInstance = &serviceNameMappingListener{ |
| nameMapping: extension.GetGlobalServiceNameMapping(), |
| } |
| }) |
| return serviceNameMappingListenerInstance |
| } |