mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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106 lines
2.3 KiB
C++
106 lines
2.3 KiB
C++
/** Drop hook.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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/** @addtogroup hooks Hook functions
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* @{
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*/
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#include <cinttypes>
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#include <villas/hook.hpp>
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#include <villas/node.h>
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#include <villas/sample.h>
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namespace villas {
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namespace node {
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class DropHook : public Hook {
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protected:
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sample *prev;
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public:
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using Hook::Hook;
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virtual void start()
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{
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assert(state == State::PREPARED || state == State::STOPPED);
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prev = nullptr;
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state = State::STARTED;
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}
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virtual void stop()
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{
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assert(state == State::STARTED);
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if (prev)
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sample_decref(prev);
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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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{
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int dist;
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assert(state == State::STARTED);
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if (prev) {
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dist = smp->sequence - (int64_t) prev->sequence;
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if (dist <= 0) {
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logger->debug("Dropping reordered sample: sequence={}, distance={}", smp->sequence, dist);
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return Hook::Reason::SKIP_SAMPLE;
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}
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}
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sample_incref(smp);
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if (prev)
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sample_decref(prev);
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prev = smp;
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return Reason::OK;
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}
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virtual void restart()
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{
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assert(state == State::STARTED);
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if (prev) {
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sample_decref(prev);
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prev = nullptr;
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}
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}
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};
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/* Register hook */
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static char n[] = "drop";
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static char d[] = "Drop messages with reordered sequence numbers";
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static HookPlugin<DropHook, n, d, (int) Hook::Flags::BUILTIN | (int) Hook::Flags::NODE_READ, 3> p;
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} /* namespace node */
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} /* namespace villas */
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/** @} */
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