Program Listing for File file_source.cpp

(Latest Version)

Return to documentation for file (morpheus/_lib/src/stages/file_source.cpp)


/* * SPDX-FileCopyrightText: Copyright (c) 2021-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. * SPDX-License-Identifier: Apache-2.0 * * Licensed 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 * * * * 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. */ #include "morpheus/stages/file_source.hpp" #include "mrc/node/rx_sink_base.hpp" #include "mrc/node/rx_source_base.hpp" #include "mrc/node/source_properties.hpp" #include "mrc/segment/object.hpp" #include "mrc/types.hpp" #include "pymrc/node.hpp" #include "morpheus/io/deserializers.hpp" #include "morpheus/objects/table_info.hpp" #include "morpheus/utilities/cudf_util.hpp" #include <cudf/types.hpp> #include <glog/logging.h> #include <mrc/segment/builder.hpp> #include <pybind11/gil.h> #include <pybind11/pybind11.h> // for str_attr_accessor #include <pybind11/pytypes.h> // for pybind11::int_ #include <functional> #include <memory> #include <sstream> #include <utility> // IWYU thinks we need __alloc_traits<>::value_type for vector assignments // IWYU pragma: no_include namespace morpheus { // Component public implementations // ************ FileSourceStage ************* // FileSourceStage::FileSourceStage(std::string filename, int repeat) : PythonSource(build()), m_filename(std::move(filename)), m_repeat(repeat) {} FileSourceStage::subscriber_fn_t FileSourceStage::build() { return [this](rxcpp::subscriber<source_type_t> output) { auto data_table = load_table_from_file(m_filename); int index_col_count = prepare_df_index(data_table); // Next, create the message metadata. This gets reused for repeats // When index_col_count is 0 this will cause a new range index to be created auto meta = MessageMeta::create_from_cpp(std::move(data_table), index_col_count); // next_meta stores a copy of the upcoming meta std::shared_ptr<MessageMeta> next_meta = nullptr; for (cudf::size_type repeat_idx = 0; repeat_idx < m_repeat; ++repeat_idx) { if (!output.is_subscribed()) { // Grab the GIL before disposing, just in case pybind11::gil_scoped_acquire gil; // Reset meta to allow the DCHECK after the loop to pass meta.reset(); break; } // Clone the meta object before pushing while we still have access to it if (repeat_idx + 1 < m_repeat) { // Use the copy function, copy_to_py_object will acquire it's own gil auto df = CudfHelper::table_from_table_info(meta->get_info()); // GIL must come after get_info pybind11::gil_scoped_acquire gil; pybind11::int_ df_len = pybind11::len(df); pybind11::object index = df.attr("index"); df.attr("index") = index + df_len; next_meta = MessageMeta::create_from_python(std::move(df)); } DCHECK(meta) << "Cannot push null meta"; output.on_next(std::move(meta)); // Move next_meta into meta std::swap(meta, next_meta); } DCHECK(!meta) << "meta was not properly pushed"; DCHECK(!next_meta) << "next_meta was not properly pushed"; output.on_completed(); }; } // ************ FileSourceStageInterfaceProxy ************ // std::shared_ptr<mrc::segment::Object<FileSourceStage>> FileSourceStageInterfaceProxy::init( mrc::segment::Builder& builder, const std::string& name, std::string filename, int repeat) { auto stage = builder.construct_object<FileSourceStage>(name, filename, repeat); return stage; } } // namespace morpheus

© Copyright 2023, NVIDIA. Last updated on Apr 11, 2023.