| /** |
| * 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 NIFI_MINIFI_CPP_KAFKAPOOL_H |
| #define NIFI_MINIFI_CPP_KAFKAPOOL_H |
| |
| #include "KafkaConnection.h" |
| |
| namespace org { |
| namespace apache { |
| namespace nifi { |
| namespace minifi { |
| namespace processors { |
| |
| class KafkaPool { |
| public: |
| |
| explicit KafkaPool(int max) |
| : max_(max) { |
| } |
| |
| bool removeConnection(const KafkaConnectionKey &key) { |
| std::lock_guard<std::mutex> lock(mutex_); |
| return map_.erase(key) == 1; |
| } |
| |
| std::unique_ptr<KafkaLease> getOrCreateConnection(const KafkaConnectionKey &key) { |
| std::lock_guard<std::mutex> lock(mutex_); |
| auto connection = map_.find(key); |
| std::shared_ptr<KafkaConnection> conn; |
| if (connection == map_.end()) { |
| // Not found, create new connection. |
| conn = std::make_shared<KafkaConnection>(key); |
| if (map_.size() == max_) { |
| // Reached pool limit, remove the first one. |
| map_.erase(map_.begin()); |
| } |
| map_[key] = conn; |
| } else { |
| conn = connection->second; |
| } |
| std::unique_ptr<KafkaLease> lease; |
| if (conn->tryUse()) { |
| lease = std::unique_ptr<KafkaLease>(new KafkaLease(conn)); |
| } |
| return lease; |
| } |
| |
| private: |
| std::mutex mutex_; |
| |
| size_t max_; |
| |
| std::map<KafkaConnectionKey, std::shared_ptr<KafkaConnection>> map_; |
| }; |
| |
| } /* namespace processors */ |
| } /* namespace minifi */ |
| } /* namespace nifi */ |
| } /* namespace apache */ |
| } /* namespace org */ |
| |
| #endif //NIFI_MINIFI_CPP_KAFKAPOOL_H |