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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2016 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.
*/
#ifndef NDN_DETAIL_PENDING_INTEREST_HPP
#define NDN_DETAIL_PENDING_INTEREST_HPP
#include "../interest.hpp"
#include "../data.hpp"
#include "../lp/nack.hpp"
#include "../util/scheduler-scoped-event-id.hpp"
namespace ndn {
/**
* @brief stores a pending Interest and associated callbacks
*/
class PendingInterest : noncopyable
{
public:
/**
* @brief Construct a pending Interest record
*
* The timeout is set based on the current time and the Interest lifetime.
* This class will invoke the timeout callback unless the record is deleted before timeout.
*
* @param interest the Interest
* @param dataCallback invoked when matching Data packet is received
* @param nackCallback invoked when Nack matching Interest is received
* @param timeoutCallback invoked when Interest times out
* @param scheduler Scheduler for scheduling the timeout event
*/
PendingInterest(shared_ptr<const Interest> interest,
const DataCallback& dataCallback,
const NackCallback& nackCallback,
const TimeoutCallback& timeoutCallback,
Scheduler& scheduler)
: m_interest(interest)
, m_dataCallback(dataCallback)
, m_nackCallback(nackCallback)
, m_timeoutCallback(timeoutCallback)
, m_timeoutEvent(scheduler)
{
m_timeoutEvent =
scheduler.scheduleEvent(m_interest->getInterestLifetime() > time::milliseconds::zero() ?
m_interest->getInterestLifetime() :
DEFAULT_INTEREST_LIFETIME,
[=] { this->invokeTimeoutCallback(); });
}
/**
* @return the Interest
*/
shared_ptr<const Interest>
getInterest() const
{
return m_interest;
}
/**
* @brief invokes the Data callback
* @note This method does nothing if the Data callback is empty
*/
void
invokeDataCallback(const Data& data)
{
if (m_dataCallback != nullptr) {
m_dataCallback(*m_interest, data);
}
}
/**
* @brief invokes the Nack callback
* @note This method does nothing if the Nack callback is empty
*/
void
invokeNackCallback(const lp::Nack& nack)
{
if (m_nackCallback != nullptr) {
m_nackCallback(*m_interest, nack);
}
}
/**
* @brief Set cleanup function to be invoked when Interest times out
*/
void
setDeleter(const std::function<void()>& deleter)
{
m_deleter = deleter;
}
private:
/**
* @brief invokes the timeout callback (if non-empty) and the deleter
*/
void
invokeTimeoutCallback()
{
if (m_timeoutCallback) {
m_timeoutCallback(*m_interest);
}
BOOST_ASSERT(m_deleter);
m_deleter();
}
private:
shared_ptr<const Interest> m_interest;
DataCallback m_dataCallback;
NackCallback m_nackCallback;
TimeoutCallback m_timeoutCallback;
util::scheduler::ScopedEventId m_timeoutEvent;
std::function<void()> m_deleter;
};
/**
* @brief Opaque type to identify a PendingInterest
*/
class PendingInterestId;
/**
* @brief Functor to match PendingInterestId
*/
class MatchPendingInterestId
{
public:
explicit
MatchPendingInterestId(const PendingInterestId* pendingInterestId)
: m_id(pendingInterestId)
{
}
bool
operator()(const shared_ptr<const PendingInterest>& pendingInterest) const
{
return reinterpret_cast<const PendingInterestId*>(pendingInterest->getInterest().get()) == m_id;
}
private:
const PendingInterestId* m_id;
};
} // namespace ndn
#endif // NDN_DETAIL_PENDING_INTEREST_HPP