| /* |
| * 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 handler |
| |
| import ( |
| "sync" |
| |
| "github.com/apache/dubbo-go/filter" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common" |
| "github.com/apache/dubbo-go/common/constant" |
| "github.com/apache/dubbo-go/common/extension" |
| "github.com/apache/dubbo-go/common/logger" |
| "github.com/apache/dubbo-go/protocol" |
| ) |
| |
| const ( |
| // HandlerName handler name |
| HandlerName = "log" |
| ) |
| |
| func init() { |
| // this implementation is the the default implementation of RejectedExecutionHandler |
| extension.SetRejectedExecutionHandler(HandlerName, GetOnlyLogRejectedExecutionHandler) |
| extension.SetRejectedExecutionHandler(constant.DEFAULT_KEY, GetOnlyLogRejectedExecutionHandler) |
| } |
| |
| var ( |
| onlyLogHandlerInstance *OnlyLogRejectedExecutionHandler |
| onlyLogHandlerOnce sync.Once |
| ) |
| |
| // OnlyLogRejectedExecutionHandler implements the RejectedExecutionHandler |
| /** |
| * This implementation only logs the invocation info. |
| * it always return en error inside the result. |
| * "UserProvider": |
| * registry: "hangzhouzk" |
| * protocol : "dubbo" |
| * interface : "com.ikurento.user.UserProvider" |
| * ... # other configuration |
| * tps.limiter: "method-service" # the name of limiter |
| * tps.limit.rejected.handler: "default" or "log" |
| * methods: |
| * - name: "GetUser" |
| * OnlyLogRejectedExecutionHandler is designed to be singleton |
| */ |
| type OnlyLogRejectedExecutionHandler struct{} |
| |
| // RejectedExecution will do nothing, it only log the invocation. |
| func (handler *OnlyLogRejectedExecutionHandler) RejectedExecution(url *common.URL, |
| _ protocol.Invocation) protocol.Result { |
| |
| logger.Errorf("The invocation was rejected. url: %s", url.String()) |
| return &protocol.RPCResult{} |
| } |
| |
| // GetOnlyLogRejectedExecutionHandler will return the instance of OnlyLogRejectedExecutionHandler |
| func GetOnlyLogRejectedExecutionHandler() filter.RejectedExecutionHandler { |
| onlyLogHandlerOnce.Do(func() { |
| onlyLogHandlerInstance = &OnlyLogRejectedExecutionHandler{} |
| }) |
| return onlyLogHandlerInstance |
| } |