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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (C) 2014 Named Data Networking Project
* See COPYING for copyright and distribution information.
*/
#ifndef NFD_FACE_FACE_HPP
#define NFD_FACE_FACE_HPP
#include "common.hpp"
#include "core/event-emitter.hpp"
namespace nfd {
/** \class FaceId
* \brief identifies a face
*/
typedef int FaceId;
const FaceId INVALID_FACEID = -1;
const std::size_t MAX_NDN_PACKET_SIZE = 8800;
/** \brief represents a face
*/
class Face : noncopyable, public enable_shared_from_this<Face>
{
public:
/**
* \brief Face-related error
*/
struct Error : public std::runtime_error
{
Error(const std::string& what) : std::runtime_error(what) {}
};
Face();
virtual
~Face();
FaceId
getId() const;
/// fires when an Interest is received
EventEmitter<Interest> onReceiveInterest;
/// fires when a Data is received
EventEmitter<Data> onReceiveData;
/// fires when face disconnects or fails to perform properly
EventEmitter<std::string/*reason*/> onFail;
/// send an Interest
virtual void
sendInterest(const Interest& interest) = 0;
/// send a Data
virtual void
sendData(const Data& data) = 0;
/** \brief Close the face
*
* This terminates all communication on the face and cause
* onFail() method event to be invoked
*/
virtual void
close() = 0;
/** \brief Get whether underlying communication is up
*
* In this base class this property is always true.
*/
virtual bool
isUp() const;
/** \brief Get whether face is connected to a local app
*
* False by default and can become true if a derived class, implementing
* one of the local face types, explicitly calls Face::setLocal(true)
*/
bool
isLocal() const;
/** \brief Set the description
*
* This is typically invoked by mgmt on set description command
*/
virtual void
setDescription(const std::string& description);
/// Get the description
virtual const std::string&
getDescription() const;
/** \brief Get whether packets sent this Face may reach multiple peers
*
* In this base class this property is always false.
*/
virtual bool
isMultiAccess() const;
protected:
void
setLocal(bool isLocal);
// this is a non-virtual method
bool
decodeAndDispatchInput(const Block& element);
private:
void
setId(FaceId faceId);
private:
FaceId m_id;
std::string m_description;
bool m_isLocal; // for scoping purposes
// allow setting FaceId
friend class Forwarder;
};
} // namespace nfd
#endif // NFD_FACE_FACE_HPP