mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
156 lines
3.7 KiB
C++
156 lines
3.7 KiB
C++
/* Reorder samples hook.
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*
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* Author: Philipp Jungkamp <philipp.jungkamp@opal-rt.com>
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* SPDX-FileCopyrightText: 2023, OPAL-RT Germany GmbH
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "villas/exceptions.hpp"
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#include <algorithm>
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#include <cstring>
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#include <ctime>
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#include <vector>
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#include <villas/hook.hpp>
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#include <villas/sample.hpp>
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#include <villas/timing.hpp>
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namespace villas {
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namespace node {
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class ReorderTsHook : public Hook {
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protected:
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std::vector<Sample *> window;
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std::size_t window_size;
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Sample *buffer;
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void swapSample(Sample *lhs, Sample *rhs) {
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if (buffer) {
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sample_copy(buffer, lhs);
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sample_copy(lhs, rhs);
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sample_copy(rhs, buffer);
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} else {
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buffer = sample_clone(lhs);
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if (!buffer)
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throw RuntimeError{"Out of memory."};
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sample_copy(lhs, rhs);
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sample_copy(rhs, buffer);
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}
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}
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public:
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ReorderTsHook(Path *p, Node *n, int fl, int prio, bool en = true)
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: Hook(p, n, fl, prio, en), window{}, window_size(16), buffer(nullptr) {}
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virtual void parse(json_t *json) {
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assert(state != State::STARTED);
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json_error_t err;
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int ret =
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json_unpack_ex(json, &err, 0, "{ s?: i }", "window_size", &window_size);
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if (ret)
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throw ConfigError(json, err, "node-config-hook-reorder-ts");
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state = State::PARSED;
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}
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virtual void start() {
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assert(state == State::PREPARED || state == State::STOPPED);
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window.reserve(window_size);
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state = State::STARTED;
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}
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virtual void stop() {
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assert(state == State::STARTED);
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for (auto sample : window)
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sample_free(sample);
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if (buffer)
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sample_free(buffer);
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window.clear();
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state = State::STOPPED;
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}
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virtual Hook::Reason process(Sample *smp) {
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assert(state == State::STARTED);
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assert(smp);
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if (window.empty()) {
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auto new_smp = sample_clone(smp);
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if (!new_smp)
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throw RuntimeError{"Out of memory."};
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window.push_back(new_smp);
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logger->debug("window.size={}/{}", window.size(), window_size);
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return Hook::Reason::SKIP_SAMPLE;
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}
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for (std::size_t i = window.size() - 1;; i--) {
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if (time_cmp(&smp->ts.origin, &window[i]->ts.origin) >= 0) {
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if (i != window.size() - 1)
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logger->warn("Fixing reordered Sample");
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if (window.size() == window_size) {
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Sample *window_sample = window.front();
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std::copy(++std::begin(window), std::next(std::begin(window), i + 1),
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std::begin(window));
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window[i] = window_sample;
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swapSample(window_sample, smp);
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return Hook::Reason::OK;
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} else {
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window.push_back(nullptr);
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std::copy_backward(std::next(std::begin(window), i + 1),
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--std::end(window), std::end(window));
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auto new_smp = sample_clone(smp);
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if (!new_smp)
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throw RuntimeError{"Out of memory."};
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window[i + 1] = new_smp;
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logger->debug("window.size={}/{}", window.size(), window_size);
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return Hook::Reason::SKIP_SAMPLE;
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}
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}
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if (!i)
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break;
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}
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logger->error("Could not reorder Sample");
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return Hook::Reason::SKIP_SAMPLE;
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}
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virtual void restart() {
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assert(state == State::STARTED);
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for (auto sample : window)
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sample_free(sample);
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window.clear();
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}
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};
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// Register hook
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static char n[] = "reorder_ts";
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static char d[] = "Reorder messages by their timestamp";
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static HookPlugin<ReorderTsHook, n, d,
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(int)Hook::Flags::NODE_WRITE | (int)Hook::Flags::PATH |
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(int)Hook::Flags::NODE_READ,
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2>
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p;
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} // namespace node
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} // namespace villas
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