| /* |
| * 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 pkg |
| |
| import ( |
| "math/rand" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go/common/extension" |
| "github.com/apache/dubbo-go/filter" |
| "github.com/dubbogo/gost/log" |
| ) |
| |
| func init() { |
| /* |
| * register your implementation and them using it like: |
| * |
| * "UserProvider": |
| * registry: "hangzhouzk" |
| * protocol : "dubbo" |
| * interface : "com.ikurento.user.UserProvider" |
| * ... # other configuration |
| * tps.limiter: "method-service" # the name of limiter |
| * tps.limit.strategy: "RandomLimitStrategy" |
| */ |
| extension.SetTpsLimitStrategy("RandomLimitStrategy", &RandomTpsLimitStrategyCreator{}) |
| } |
| |
| /** |
| * The RandomTpsLimitStrategy should not be singleton because different TpsLimiter will create many instances. |
| * we won't want them affect each other. |
| */ |
| type RandomTpsLimitStrategy struct { |
| rate int |
| interval int |
| } |
| |
| func (r RandomTpsLimitStrategy) IsAllowable() bool { |
| // this is a simple demo. |
| gxlog.CInfo("Random IsAllowable!") |
| randNum := rand.Int63n(2) |
| return randNum == 0 |
| } |
| |
| type RandomTpsLimitStrategyCreator struct{} |
| |
| func (creator *RandomTpsLimitStrategyCreator) Create(rate int, interval int) filter.TpsLimitStrategy { |
| return &RandomTpsLimitStrategy{ |
| rate: rate, |
| interval: interval, |
| } |
| } |