| /* |
| * 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 service |
| |
| import ( |
| "sync" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/common" |
| "dubbo.apache.org/dubbo-go/v3/common/constant" |
| "dubbo.apache.org/dubbo-go/v3/registry" |
| ) |
| |
| // MetadataService is used to define meta data related behaviors |
| // usually the implementation should be singleton |
| type MetadataService interface { |
| common.ReferencedRPCService |
| // ServiceName will get the service's name in meta service , which is application name |
| ServiceName() (string, error) |
| // ExportURL will store the exported url in metadata |
| ExportURL(url *common.URL) (bool, error) |
| // UnexportURL will delete the exported url in metadata |
| UnexportURL(url *common.URL) error |
| // SubscribeURL will store the subscribed url in metadata |
| SubscribeURL(url *common.URL) (bool, error) |
| // UnsubscribeURL will delete the subscribed url in metadata |
| UnsubscribeURL(url *common.URL) error |
| // PublishServiceDefinition will generate the target url's code info |
| PublishServiceDefinition(url *common.URL) error |
| // GetExportedURLs will get the target exported url in metadata |
| // the url should be unique |
| // due to dubbo-go only support return array []interface{} in RPCService, so we should declare the return type as []interface{} |
| // actually, it's []String |
| GetExportedURLs(serviceInterface string, group string, version string, protocol string) ([]*common.URL, error) |
| // MethodMapper for rename dubbo method name |
| MethodMapper() map[string]string |
| // GetExportedURLs will get the target subscribed url in metadata |
| // the url should be unique |
| GetSubscribedURLs() ([]*common.URL, error) |
| // GetServiceDefinition will get the target service info store in metadata |
| GetServiceDefinition(interfaceName string, group string, version string) (string, error) |
| // GetServiceDefinition will get the target service info store in metadata by service key |
| GetServiceDefinitionByServiceKey(serviceKey string) (string, error) |
| // RefreshMetadata will refresh the metadata |
| RefreshMetadata(exportedRevision string, subscribedRevision string) (bool, error) |
| // Version will return the metadata service version |
| Version() (string, error) |
| // GetMetadataInfo will return metadata info |
| GetMetadataInfo(revision string) (*common.MetadataInfo, error) |
| // GetExportedServiceURLs will return exported service urls |
| GetExportedServiceURLs() []*common.URL |
| // GetMetadataServiceURL will return the url of metadata service |
| GetMetadataServiceURL() *common.URL |
| // SetMetadataServiceURL will save the url of metadata service |
| SetMetadataServiceURL(*common.URL) |
| } |
| |
| // BaseMetadataService is used for the event logic for struct who will implement interface MetadataService |
| type BaseMetadataService struct { |
| serviceName string |
| } |
| |
| func NewBaseMetadataService(serviceName string) BaseMetadataService { |
| return BaseMetadataService{ |
| serviceName: serviceName, |
| } |
| } |
| |
| func (mts *BaseMetadataService) MethodMapper() map[string]string { |
| return map[string]string{ |
| "GetExportedURLs": "getExportedURLs", |
| "GetMetadataInfo": "getMetadataInfo", |
| } |
| } |
| |
| // ServiceName can get the service's name in meta service , which is application name |
| func (mts *BaseMetadataService) ServiceName() (string, error) { |
| return mts.serviceName, nil |
| } |
| |
| // Reference will return the reference id of metadata service |
| func (mts *BaseMetadataService) Reference() string { |
| return constant.SIMPLE_METADATA_SERVICE_NAME |
| } |
| |
| type MetadataServiceProxyFactory interface { |
| GetProxy(ins registry.ServiceInstance) MetadataService |
| } |
| |
| type MetadataServiceProxyCreator func(ins registry.ServiceInstance) MetadataService |
| |
| type BaseMetadataServiceProxyFactory struct { |
| proxies sync.Map |
| creator MetadataServiceProxyCreator |
| } |
| |
| func NewBaseMetadataServiceProxyFactory(creator MetadataServiceProxyCreator) *BaseMetadataServiceProxyFactory { |
| return &BaseMetadataServiceProxyFactory{ |
| creator: creator, |
| } |
| } |
| |
| func (b *BaseMetadataServiceProxyFactory) GetProxy(ins registry.ServiceInstance) MetadataService { |
| key := ins.GetServiceName() + "##" + getExportedServicesRevision(ins) |
| if proxy, ok := b.proxies.Load(key); ok { |
| return proxy.(MetadataService) |
| } |
| v, _ := b.proxies.LoadOrStore(key, b.creator(ins)) |
| return v.(MetadataService) |
| } |
| |
| func getExportedServicesRevision(serviceInstance registry.ServiceInstance) string { |
| metaData := serviceInstance.GetMetadata() |
| return metaData[constant.EXPORTED_SERVICES_REVISION_PROPERTY_NAME] |
| } |
| |
| func ConvertURLArrToIntfArr(urls []*common.URL) []interface{} { |
| if len(urls) == 0 { |
| return []interface{}{} |
| } |
| |
| res := make([]interface{}, 0, len(urls)) |
| for _, u := range urls { |
| res = append(res, u.String()) |
| } |
| return res |
| } |