| /** |
| * |
| * 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_PYPROCESSESSION_H |
| #define NIFI_MINIFI_CPP_PYPROCESSESSION_H |
| |
| #include <pybind11/embed.h> |
| |
| #include <core/ProcessSession.h> |
| |
| #include "../ScriptFlowFile.h" |
| |
| #include "PyBaseStream.h" |
| |
| #pragma GCC visibility push(hidden) |
| |
| namespace org { |
| namespace apache { |
| namespace nifi { |
| namespace minifi { |
| namespace python { |
| |
| namespace py = pybind11; |
| |
| class PyProcessSession { |
| public: |
| explicit PyProcessSession(std::shared_ptr<core::ProcessSession> session); |
| |
| std::shared_ptr<script::ScriptFlowFile> get(); |
| std::shared_ptr<script::ScriptFlowFile> create(); |
| std::shared_ptr<script::ScriptFlowFile> create(std::shared_ptr<script::ScriptFlowFile> flow_file); |
| void transfer(std::shared_ptr<script::ScriptFlowFile> flow_file, core::Relationship relationship); |
| void read(std::shared_ptr<script::ScriptFlowFile> flow_file, py::object input_stream_callback); |
| void write(std::shared_ptr<script::ScriptFlowFile> flow_file, py::object output_stream_callback); |
| |
| /** |
| * Sometimes we want to release shared pointers to core resources when |
| * we know they are no longer in need. This method is for those times. |
| * |
| * For example, we do not want to hold on to shared pointers to FlowFiles |
| * after an onTrigger call, because doing so can be very expensive in terms |
| * of repository resources. |
| */ |
| void releaseCoreResources(); |
| |
| class PyInputStreamCallback : public InputStreamCallback { |
| public: |
| explicit PyInputStreamCallback(const py::object &input_stream_callback) { |
| py_callback_ = input_stream_callback; |
| } |
| |
| int64_t process(std::shared_ptr<io::BaseStream> stream) override { |
| auto py_stream = std::make_shared<PyBaseStream>(stream); |
| return py_callback_.attr("process")(py_stream).cast<int64_t>(); |
| } |
| |
| private: |
| py::object py_callback_; |
| }; |
| |
| class PyOutputStreamCallback : public OutputStreamCallback { |
| public: |
| explicit PyOutputStreamCallback(const py::object &output_stream_callback) { |
| py_callback_ = output_stream_callback; |
| } |
| |
| int64_t process(std::shared_ptr<io::BaseStream> stream) override { |
| auto py_stream = std::make_shared<PyBaseStream>(stream); |
| return py_callback_.attr("process")(py_stream).cast<int64_t>(); |
| } |
| |
| private: |
| py::object py_callback_; |
| }; |
| |
| private: |
| std::vector<std::shared_ptr<script::ScriptFlowFile>> flow_files_; |
| std::shared_ptr<core::ProcessSession> session_; |
| }; |
| |
| } /* namespace python */ |
| } /* namespace minifi */ |
| } /* namespace nifi */ |
| } /* namespace apache */ |
| } /* namespace org */ |
| |
| #pragma GCC visibility pop |
| |
| #endif //NIFI_MINIFI_CPP_PYPROCESSESSION_H |