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consumer-with-timer.cpp
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consumer-with-timer.cpp
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2013-2023 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#include <ndn-cxx/face.hpp>
#include <ndn-cxx/util/scheduler.hpp>
#include <boost/asio/io_context.hpp>
#include <iostream>
// Enclosing code in ndn simplifies coding (can also use `using namespace ndn`)
namespace ndn {
// Additional nested namespaces should be used to prevent/limit name conflicts
namespace examples {
class ConsumerWithTimer
{
public:
void
run()
{
Name interestName("/example/testApp/randomData");
interestName.appendVersion();
Interest interest(interestName);
interest.setMustBeFresh(true);
interest.setInterestLifetime(2_s);
std::cout << "Sending Interest " << interest << std::endl;
m_face.expressInterest(interest,
std::bind(&ConsumerWithTimer::onData, this, _1, _2),
std::bind(&ConsumerWithTimer::onNack, this, _1, _2),
std::bind(&ConsumerWithTimer::onTimeout, this, _1));
// Schedule a new event
m_scheduler.schedule(3_s, [this] { delayedInterest(); });
// m_ioCtx.run() will block until all events finished or m_ioCtx.stop() is called
m_ioCtx.run();
// Alternatively, m_face.processEvents() can also be called.
// processEvents will block until the requested data received or timeout occurs.
// m_face.processEvents();
}
private:
void
onData(const Interest&, const Data& data) const
{
std::cout << "Received Data " << data << std::endl;
}
void
onNack(const Interest& interest, const lp::Nack& nack) const
{
std::cout << "Received Nack with reason " << nack.getReason()
<< " for " << interest << std::endl;
}
void
onTimeout(const Interest& interest) const
{
std::cout << "Timeout for " << interest << std::endl;
}
void
delayedInterest()
{
std::cout << "One more Interest, delayed by the scheduler" << std::endl;
Name interestName("/example/testApp/randomData");
interestName.appendVersion();
Interest interest(interestName);
interest.setMustBeFresh(true);
interest.setInterestLifetime(2_s);
std::cout << "Sending Interest " << interest << std::endl;
m_face.expressInterest(interest,
std::bind(&ConsumerWithTimer::onData, this, _1, _2),
std::bind(&ConsumerWithTimer::onNack, this, _1, _2),
std::bind(&ConsumerWithTimer::onTimeout, this, _1));
}
private:
// Explicitly create io_context object, which will be shared between Face and Scheduler
boost::asio::io_context m_ioCtx;
Face m_face{m_ioCtx};
Scheduler m_scheduler{m_ioCtx};
};
} // namespace examples
} // namespace ndn
int
main(int argc, char** argv)
{
try {
ndn::examples::ConsumerWithTimer consumer;
consumer.run();
return 0;
}
catch (const std::exception& e) {
std::cerr << "ERROR: " << e.what() << std::endl;
return 1;
}
}