| /* |
| * 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. |
| */ |
| |
| #ifndef __ALLOCATEMESSAGEQUEUESTRATEGY_H__ |
| #define __ALLOCATEMESSAGEQUEUESTRATEGY_H__ |
| |
| #include "Logging.h" |
| #include "MQClientException.h" |
| #include "MQMessageQueue.h" |
| |
| namespace rocketmq { |
| //<!*************************************************************************** |
| class AllocateMQStrategy { |
| public: |
| virtual ~AllocateMQStrategy() {} |
| virtual void allocate(const std::string& currentCID, |
| std::vector<MQMessageQueue>& mqAll, |
| std::vector<std::string>& cidAll, |
| std::vector<MQMessageQueue>& outReuslt) = 0; |
| }; |
| |
| //<!************************************************************************ |
| class AllocateMQAveragely : public AllocateMQStrategy { |
| public: |
| virtual ~AllocateMQAveragely() {} |
| virtual void allocate(const std::string& currentCID, |
| std::vector<MQMessageQueue>& mqAll, |
| std::vector<std::string>& cidAll, |
| std::vector<MQMessageQueue>& outReuslt) { |
| outReuslt.clear(); |
| if (currentCID.empty()) { |
| THROW_MQEXCEPTION(MQClientException, "currentCID is empty", -1); |
| } |
| |
| if (mqAll.empty()) { |
| THROW_MQEXCEPTION(MQClientException, "mqAll is empty", -1); |
| } |
| |
| if (cidAll.empty()) { |
| THROW_MQEXCEPTION(MQClientException, "cidAll is empty", -1); |
| } |
| |
| int index = -1; |
| int cidAllSize = cidAll.size(); |
| for (int i = 0; i < cidAllSize; i++) { |
| if (cidAll[i] == currentCID) { |
| index = i; |
| break; |
| } |
| } |
| |
| if (index == -1) { |
| LOG_ERROR("could not find clientId from Broker"); |
| return; |
| } |
| |
| int mqAllSize = mqAll.size(); |
| int mod = mqAllSize % cidAllSize; |
| int averageSize = |
| mqAllSize <= cidAllSize ? 1 : (mod > 0 && index < mod ? mqAllSize / cidAllSize + 1 : mqAllSize / cidAllSize); |
| int startIndex = (mod > 0 && index < mod) ? index * averageSize : index * averageSize + mod; |
| int range = (std::min)(averageSize, mqAllSize - startIndex); |
| LOG_INFO( |
| "range is:%d, index is:%d, mqAllSize is:%d, averageSize is:%d, " |
| "startIndex is:%d", |
| range, index, mqAllSize, averageSize, startIndex); |
| //<!out; |
| if (range >= 0) // example: range is:-1, index is:1, mqAllSize is:1, |
| // averageSize is:1, startIndex is:2 |
| { |
| for (int i = 0; i < range; i++) { |
| if ((startIndex + i) >= 0) { |
| outReuslt.push_back(mqAll.at((startIndex + i) % mqAllSize)); |
| } |
| } |
| } |
| } |
| }; |
| |
| //<!*************************************************************************** |
| } // namespace rocketmq |
| #endif |