| /* |
| * 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 iwrr |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/cluster/loadbalance" |
| "dubbo.apache.org/dubbo-go/v3/common/constant" |
| "dubbo.apache.org/dubbo-go/v3/common/extension" |
| "dubbo.apache.org/dubbo-go/v3/protocol" |
| ) |
| |
| func init() { |
| extension.SetLoadbalance(constant.LoadBalanceKeyInterleavedWeightedRoundRobin, newInterleavedWeightedRoundRobinBalance) |
| } |
| |
| type interleavedWeightedRoundRobinBalance struct{} |
| |
| // newInterleavedWeightedRoundRobinBalance returns a interleaved weighted round robin load balance. |
| func newInterleavedWeightedRoundRobinBalance() loadbalance.LoadBalance { |
| return &interleavedWeightedRoundRobinBalance{} |
| } |
| |
| // Select gets invoker based on interleaved weighted round robine load balancing strategy |
| func (lb *interleavedWeightedRoundRobinBalance) Select(invokers []protocol.Invoker, invocation protocol.Invocation) protocol.Invoker { |
| count := len(invokers) |
| if count == 0 { |
| return nil |
| } |
| if count == 1 { |
| return invokers[0] |
| } |
| |
| iwrrp := NewInterleavedweightedRoundRobin(invokers, invocation) |
| return iwrrp.Pick(invocation) |
| } |