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/* Shift sequence number of samples.

* Author: Steffen Vogel <post@steffenvogel.de>

* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University

* SPDX-License-Identifier: Apache-2.0

#include <villas/hook.hpp>

#include <villas/sample.hpp>

namespace villas {

namespace node {

class ShiftSequenceHook : public Hook {

protected:

int offset;

public:

using Hook::Hook;

void parse(json_t *json) override {

json_error_t err;

int ret;

assert(state != State::STARTED);

Hook::parse(json);

ret = json_unpack_ex(json, &err, 0, "{ s: i }", "offset", &offset);

if (ret)

throw ConfigError(json, err, "node-config-hook-shift_seq");

state = State::PARSED;

}

Hook::Reason process(struct Sample *smp) override {

assert(state == State::STARTED);

smp->sequence += offset;

return Reason::OK;

}

};

// Register hook

static char n[] = "shift_seq";

static char d[] = "Shift sequence number of samples";

static HookPlugin<ShiftSequenceHook, n, d,

(int)Hook::Flags::NODE_READ | (int)Hook::Flags::PATH>

} // namespace node

} // namespace villas

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