| /* |
| * 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_allocate_message |
| |
| import ( |
| "errors" |
| "github.com/apache/incubator-rocketmq-externals/rocketmq-go/model" |
| ) |
| |
| type AllocateMessageQueueAveragelyByCircle struct{} |
| |
| func (self *AllocateMessageQueueAveragelyByCircle) Allocate(consumerGroup string, currentCID string, mqAll []*model.MessageQueue, cidAll []string) ([]model.MessageQueue, error) { |
| if currentCID == "" { |
| return nil, errors.New("currentCID is empty") |
| } |
| |
| if mqAll == nil || len(mqAll) == 0 { |
| return nil, errors.New("mqAll is nil or mqAll empty") |
| } |
| |
| if cidAll == nil || len(cidAll) == 0 { |
| return nil, errors.New("cidAll is nil or cidAll empty") |
| } |
| |
| result := make([]model.MessageQueue, 0) |
| for i, cid := range cidAll { |
| if cid == currentCID { |
| mqLen := len(mqAll) |
| cidLen := len(cidAll) |
| mod := mqLen % cidLen |
| var averageSize int |
| if mqLen < cidLen { |
| averageSize = 1 |
| } else { |
| if mod > 0 && i < mod { |
| averageSize = mqLen/cidLen + 1 |
| } else { |
| averageSize = mqLen / cidLen |
| } |
| } |
| |
| var startIndex int |
| if mod > 0 && i < mod { |
| startIndex = i * averageSize |
| } else { |
| startIndex = i*averageSize + mod |
| } |
| |
| var min int |
| if averageSize > mqLen-startIndex { |
| min = mqLen - startIndex |
| } else { |
| min = averageSize |
| } |
| |
| for j := 0; j < min; j++ { |
| result = append(result, *mqAll[(startIndex+j)%mqLen]) |
| } |
| return result, nil |
| |
| } |
| } |
| |
| return nil, errors.New("cant't find currentCID") |
| } |