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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ICNET_VEGAS_TRANSPORT_PROTOCOL_H_
#define ICNET_VEGAS_TRANSPORT_PROTOCOL_H_
#include "icnet_transport.h"
#include "icnet_transport_vegas_rto_estimator.h"
namespace icnet {
class VegasTransportProtocol : public TransportProtocol {
public:
VegasTransportProtocol(Socket *icnet_socket);
virtual ~VegasTransportProtocol();
virtual void start();
void stop();
protected:
void sendInterest();
void onContentSegment(const Interest &interest, ContentObject &content_object);
bool verifyContentObject(const Interest &interest, ContentObject &content_object);
bool verifyManifest(ContentObject &content_object);
virtual void onTimeout(const Interest &interest);
void onManifest(const Interest &interest, ContentObject &content_object);
void onContentObject(const Interest &interest, ContentObject &content_object);
virtual void changeInterestLifetime(uint64_t segment);
void scheduleNextInterests();
virtual void decreaseWindow();
virtual void increaseWindow();
virtual void afterContentReception(const Interest &interest, const ContentObject &content_object);
virtual void afterDataUnsatisfied(uint64_t segment);
void reassemble();
virtual void copyContent(ContentObject &content_object);
bool pointsToManifest(ContentObject &content_object);
bool requireInterestWithHash(const Interest &interest, const ContentObject &content_object, Manifest &manifest);
bool verifySegmentUsingManifest(Manifest &manifestSegment, ContentObject &content_object);
virtual void checkForFastRetransmission(const Interest &interest);
void fastRetransmit(const Interest &interest, uint64_t chunk_number);
void removeAllPendingInterests();
protected:
// reassembly variables
bool is_final_block_number_discovered_;
uint64_t final_block_number_;
uint64_t last_reassembled_segment_;
std::vector<uint8_t> content_buffer_;
size_t content_buffer_size_;
// transmission variables
double current_window_size_;
double pending_window_size_;
uint64_t interests_in_flight_;
uint64_t segment_number_;
std::vector<int> interest_retransmissions_;
std::vector<std::chrono::steady_clock::time_point> interest_timepoints_;
RtoEstimator rtt_estimator_;
// buffers
std::vector<std::shared_ptr<ContentObject> > receive_buffer_; // verified segments by segment number
std::vector<std::shared_ptr<ContentObject> > unverified_segments_; // used with embedded manifests
std::vector<std::shared_ptr<Manifest> > verified_manifests_; // by segment number
// Fast Retransmission
std::map<uint64_t, bool> received_segments_;
std::unordered_map<uint64_t, bool> fast_retransmitted_segments;
};
} // end namespace icnet
#endif // ICNET_VEGAS_TRANSPORT_PROTOCOL_H_
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