| /** |
| * |
| * 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 LIBMINIFI_INCLUDE_IO_TLS_RocksDbStream_H_ |
| #define LIBMINIFI_INCLUDE_IO_TLS_RocksDbStream_H_ |
| |
| #include "RocksDatabase.h" |
| #include <iostream> |
| #include <cstdint> |
| #include <string> |
| #include "io/EndianCheck.h" |
| #include "io/BaseStream.h" |
| #include "core/logging/LoggerConfiguration.h" |
| |
| namespace org { |
| namespace apache { |
| namespace nifi { |
| namespace minifi { |
| namespace io { |
| |
| /** |
| * Purpose: File Stream Base stream extension. This is intended to be a thread safe access to |
| * read/write to the local file system. |
| * |
| * Design: Simply extends BaseStream and overrides readData/writeData to allow a sink to the |
| * fstream object. |
| */ |
| class RocksDbStream : public io::BaseStream { |
| public: |
| /** |
| * File Stream constructor that accepts an fstream shared pointer. |
| * It must already be initialized for read and write. |
| */ |
| explicit RocksDbStream(std::string path, gsl::not_null<minifi::internal::RocksDatabase*> db, bool write_enable = false, rocksdb::WriteBatch* batch = nullptr); |
| |
| ~RocksDbStream() override { |
| close(); |
| } |
| |
| void close() final; |
| /** |
| * Skip to the specified offset. |
| * @param offset offset to which we will skip |
| */ |
| void seek(uint64_t offset) override; |
| |
| size_t size() const override { |
| return size_; |
| } |
| |
| /** |
| * Reads data and places it into buf |
| * @param buf buffer in which we extract data |
| * @param buflen |
| */ |
| int read(uint8_t *buf, int buflen) override; |
| |
| /** |
| * writes value to stream |
| * @param value value to write |
| * @param size size of value |
| */ |
| int write(const uint8_t *value, int size) override; |
| |
| protected: |
| std::string path_; |
| |
| bool write_enable_; |
| |
| bool exists_; |
| |
| size_t offset_; |
| |
| std::string value_; |
| |
| gsl::not_null<minifi::internal::RocksDatabase*> db_; |
| |
| rocksdb::WriteBatch* batch_; |
| |
| size_t size_; |
| |
| private: |
| |
| std::shared_ptr<logging::Logger> logger_; |
| |
| }; |
| |
| } /* namespace io */ |
| } /* namespace minifi */ |
| } /* namespace nifi */ |
| } /* namespace apache */ |
| } /* namespace org */ |
| |
| #endif /* LIBMINIFI_INCLUDE_IO_TLS_RocksDbStream_H_ */ |