mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
/* Average hook.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <villas/hook.hpp>
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#include <villas/node/exceptions.hpp>
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#include <villas/sample.hpp>
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#include <villas/signal.hpp>
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namespace villas {
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namespace node {
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class AverageHook : public MultiSignalHook {
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protected:
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unsigned offset;
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public:
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AverageHook(Path *p, Node *n, int fl, int prio, bool en = true)
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: MultiSignalHook(p, n, fl, prio, en), offset(0) {}
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virtual void prepare() {
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assert(state == State::CHECKED);
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MultiSignalHook::prepare();
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// Add averaged signal
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auto avg_sig = std::make_shared<Signal>("average", "", SignalType::FLOAT);
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if (!avg_sig)
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throw RuntimeError("Failed to create new signal");
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signals->insert(signals->begin() + offset, avg_sig);
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state = State::PREPARED;
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}
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virtual void parse(json_t *json) {
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int ret;
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json_error_t err;
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assert(state != State::STARTED);
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MultiSignalHook::parse(json);
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ret = json_unpack_ex(json, &err, 0, "{ s: i }", "offset", &offset);
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if (ret)
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throw ConfigError(json, err, "node-config-hook-average");
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state = State::PARSED;
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}
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virtual Hook::Reason process(struct Sample *smp) {
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double avg, sum = 0;
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int n = 0;
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assert(state == State::STARTED);
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for (unsigned index : signalIndices) {
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switch (sample_format(smp, index)) {
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case SignalType::INTEGER:
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sum += smp->data[index].i;
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break;
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case SignalType::FLOAT:
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sum += smp->data[index].f;
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break;
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case SignalType::INVALID:
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case SignalType::COMPLEX:
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case SignalType::BOOLEAN:
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return Hook::Reason::ERROR; // not supported
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}
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n++;
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}
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avg = sum / n;
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if (offset >= smp->length)
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return Reason::ERROR;
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sample_data_insert(smp, (union SignalData *)&avg, offset, 1);
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return Reason::OK;
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}
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};
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// Register hook
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static char n[] = "average";
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static char d[] = "Calculate average over some signals";
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static HookPlugin<AverageHook, n, d,
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(int)Hook::Flags::PATH | (int)Hook::Flags::NODE_READ |
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(int)Hook::Flags::NODE_WRITE>
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p;
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} // namespace node
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} // namespace villas
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