Program Listing for File deserialize.cpp

            

            
#include "morpheus/stages/deserialize.hpp"

#include <mrc/segment/builder.hpp>
#include <pymrc/node.hpp>
#include <rxcpp/rx.hpp>

#include <algorithm>// for min
#include <cstddef>
#include <exception>
#include <memory>
#include <type_traits>// for declval
#include <utility>

namespace morpheus {
// Component public implementations
// ************ DeserializationStage **************************** //
DeserializeStage::DeserializeStage(size_t batch_size) :
  PythonNode(base_t::op_factory_from_sub_fn(build_operator())),
  m_batch_size(batch_size)
{}

DeserializeStage::subscribe_fn_t DeserializeStage::build_operator()
{
    return [this](rxcpp::observable<sink_type_t> input, rxcpp::subscriber<source_type_t> output) {
        return input.subscribe(rxcpp::make_observer<sink_type_t>(
            [this, &output](sink_type_t x) {
                // Make one large MultiMessage
                auto full_message = std::make_shared<MultiMessage>(x, 0, x->count());

                // Loop over the MessageMeta and create sub-batches
                for (size_t i = 0; i < x->count(); i += this->m_batch_size)
                {
                    auto next = full_message->get_slice(i, std::min(i + this->m_batch_size, x->count()));

                    output.on_next(std::move(next));
                }
            },
            [&](std::exception_ptr error_ptr) { output.on_error(error_ptr); },
            [&]() { output.on_completed(); }));
    };
}

// ************ DeserializationStageInterfaceProxy ************* //
std::shared_ptr<mrc::segment::Object<DeserializeStage>> DeserializeStageInterfaceProxy::init(
    mrc::segment::Builder& builder, const std::string& name, size_t batch_size)
{
    auto stage = builder.construct_object<DeserializeStage>(name, batch_size);

    return stage;
}
}  // namespace morpheus