segment-fetcher.hpp

Go to the documentation of this file.

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NDN_UTIL_SEGMENT_FETCHER_HPP
#define NDN_UTIL_SEGMENT_FETCHER_HPP

#include "scheduler.hpp"
#include "../common.hpp"
#include "../face.hpp"
#include "../security/validator.hpp"

namespace ndn {

class OBufferStream;

namespace util {

class SegmentFetcher : noncopyable
{
public:
  static const uint32_t MAX_INTEREST_REEXPRESS;

  typedef function<void (const ConstBufferPtr& data)> CompleteCallback;
  typedef function<void (uint32_t code, const std::string& msg)> ErrorCallback;

  enum ErrorCode {
    INTEREST_TIMEOUT = 1,
    DATA_HAS_NO_SEGMENT = 2,
    SEGMENT_VALIDATION_FAIL = 3,
    NACK_ERROR = 4
  };

  static
  void
  fetch(Face& face,
        const Interest& baseInterest,
        Validator& validator,
        const CompleteCallback& completeCallback,
        const ErrorCallback& errorCallback);

  static
  void
  fetch(Face& face,
        const Interest& baseInterest,
        shared_ptr<Validator> validator,
        const CompleteCallback& completeCallback,
        const ErrorCallback& errorCallback);

private:
  SegmentFetcher(Face& face,
                 shared_ptr<Validator> validator,
                 const CompleteCallback& completeCallback,
                 const ErrorCallback& errorCallback);

  void
  fetchFirstSegment(const Interest& baseInterest, shared_ptr<SegmentFetcher> self);

  void
  fetchNextSegment(const Interest& origInterest, const Name& dataName, uint64_t segmentNo,
                   shared_ptr<SegmentFetcher> self);

  void
  afterSegmentReceived(const Interest& origInterest,
                       const Data& data, bool isSegmentZeroExpected,
                       shared_ptr<SegmentFetcher> self);
  void
  afterValidationSuccess(const shared_ptr<const Data> data,
                         bool isSegmentZeroExpected,
                         const Interest& origInterest,
                         shared_ptr<SegmentFetcher> self);

  void
  afterValidationFailure(const shared_ptr<const Data> data);

  void
  afterNackReceived(const Interest& origInterest, const lp::Nack& nack,
                    uint32_t reExpressCount, shared_ptr<SegmentFetcher> self);

  void
  reExpressInterest(Interest interest, uint32_t reExpressCount,
                    shared_ptr<SegmentFetcher> self);

private:
  Face& m_face;
  Scheduler m_scheduler;
  shared_ptr<Validator> m_validator;
  CompleteCallback m_completeCallback;
  ErrorCallback m_errorCallback;

  shared_ptr<OBufferStream> m_buffer;
};

} // namespace util
} // namespace ndn

#endif // NDN_UTIL_SEGMENT_FETCHER_HPP