iframe-proxy | Sunbelt Computer Software

History

81 lines (59 loc) · 1.58 KB

Raw

/* Drop hook.

* 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 DropHook : public Hook {

protected:

struct Sample *prev;

public:

using Hook::Hook;

virtual void start() override {

assert(state == State::PREPARED || state == State::STOPPED);

prev = nullptr;

state = State::STARTED;

}

virtual void stop() override {

assert(state == State::STARTED);

if (prev)

sample_decref(prev);

state = State::STOPPED;

}

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

int dist;

assert(state == State::STARTED);

if (prev) {

dist = smp->sequence - (int64_t)prev->sequence;

if (dist <= 0) {

logger->debug("Dropping reordered sample: sequence={}, distance={}",

smp->sequence, dist);

return Hook::Reason::SKIP_SAMPLE;

}

sample_incref(smp);

if (prev)

sample_decref(prev);

prev = smp;

return Reason::OK;

}

virtual void restart() {

assert(state == State::STARTED);

if (prev) {

sample_decref(prev);

prev = nullptr;

}

};

// Register hook

static char n[] = "drop";

static char d[] = "Drop messages with reordered sequence numbers";

static HookPlugin<DropHook, n, d,

(int)Hook::Flags::BUILTIN | (int)Hook::Flags::NODE_READ, 3>

} // namespace node

} // namespace villas

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Uh oh!

Sunbelt Computer Software

PL/B Language Development and Support

Uh oh!

FilesExpand file tree

drop.cpp

Latest commit

History

drop.cpp

File metadata and controls