source: source/ariba/communication/BaseCommunication.h@ 6849

// [License]

// The Ariba-Underlay Copyright

//

// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)

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// UniversitÀt Karlsruhe (TH)

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// Germany

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// [License]



#ifndef BASECOMMUNICATION_H_

#define BASECOMMUNICATION_H_



// boost & std includes

#include <ext/hash_map>

#include <ext/hash_set>

#include <map>

#include <set>

#include <vector>

#include <iostream>

#include <algorithm>

#include <boost/foreach.hpp>



// utilities

#include "ariba/utility/types.h"

#include "ariba/utility/messages.h"

#include "ariba/utility/logging/Logging.h"

#include "ariba/utility/misc/Demultiplexer.hpp"

#include "ariba/utility/system/SystemEventListener.h"



// new transport and addressing

#include "ariba/utility/addressing/addressing.hpp"

#include "ariba/utility/transport/transport.hpp"



// communication

#include "ariba/communication/CommunicationEvents.h"

#include "ariba/communication/EndpointDescriptor.h"

#include "ariba/communication/messages/AribaBaseMsg.h"



// network changes

#include "ariba/communication/networkinfo/NetworkChangeInterface.h"

#include "ariba/communication/networkinfo/NetworkChangeDetection.h"

#include "ariba/communication/networkinfo/NetworkInformation.h"



// disabled

//#ifndef UNDERLAY_OMNET

//  #include "ariba/communication/modules/transport/tcp/TCPTransport.h"

//  #include "ariba/communication/modules/network/ip/IPv4NetworkProtocol.h"

//  using ariba::communication::IPv4NetworkProtocol;

//  using ariba::communication::TCPTransport;

//#endif



namespace ariba {

  class SideportListener;

}



namespace ariba {

namespace communication {



using namespace std;

using namespace ariba::addressing;

using namespace ariba::transport;

using namespace ariba::utility;



// use base ariba types (clarifies multiple definitions)

using ariba::utility::Message;

using ariba::utility::seqnum_t;



/**

 * This class implements the Ariba Base Communication<br />

 *

 * Its primary task is to provide an abstraction to existing

 * protocols and addressing schemes.

 *

 * @author Sebastian Mies, Christoph Mayer

 */

class BaseCommunication:

        public NetworkChangeInterface,

        public SystemEventListener,

        public transport_listener {



        use_logging_h(BaseCommunication);

        friend class ariba::SideportListener;



public:

        /// Default ctor that just creates an non-functional base communication

        BaseCommunication();



        /// Default dtor that does nothing

        virtual ~BaseCommunication();



        /// Startup the base communication, start modules etc.

        void start();



        /// Stops the base communication, stop modules etc.

        void stop();



        /// Sets the endpoints

        void setEndpoints( string& endpoints );



        /// Check whether the base communication has been started up

        bool isStarted();



        /// Establishes a link to another end-point.

        const LinkID establishLink(const EndpointDescriptor& descriptor,

                const LinkID& linkid = LinkID::UNSPECIFIED, const QoSParameterSet& qos =

                                QoSParameterSet::DEFAULT, const SecurityParameterSet& sec =

                                SecurityParameterSet::DEFAULT);



        /// Drops a link

        void dropLink(const LinkID link);



        /**

         * Sends a message though an existing link to an end-point.

         *

         * @param lid The link identifier

         * @param message The message to be sent

         * @return A sequence number for this message

         */

        seqnum_t sendMessage(const LinkID lid, const Message* message);



        /**

         * Returns the end-point descriptor

         *

         * @param link the link id of the requested end-point

         * @return The end-point descriptor of the link's end-point

         */

        const EndpointDescriptor& getEndpointDescriptor(const LinkID link =

                        LinkID::UNSPECIFIED) const;



        /**

         * Get local links to the given endpoint of all local link

         * using the default parameter EndpointDescriptor::UNSPECIFIED

         * @param ep The remote endpoint to get all links to.

         * @return List of LinkID

         */

        LinkIDs getLocalLinks(const address_v* addr) const;



        /**

         * Registers a receiver.

         *

         * @param _receiver The receiving side

         */

        void registerMessageReceiver(MessageReceiver* receiver) {

                messageReceiver = receiver;

        }



        /**

         * Unregister a receiver.

         *

         * @param _receiver The receiving side

         */

        void unregisterMessageReceiver(MessageReceiver* receiver) {

                messageReceiver = NULL;

        }



        void registerEventListener(CommunicationEvents* _events);



        void unregisterEventListener(CommunicationEvents* _events);



        /// called when a system event is emitted by system queue

        virtual void handleSystemEvent(const SystemEvent& event);



        /// called when a message is received form transport_peer

        virtual void receive_message(transport_protocol* transport,

                const address_vf local, const address_vf remote, const uint8_t* data,

                size_t size);



protected:



        /// handle received message from a transport module

        void receiveMessage(const Message* message,

                const address_v* local, const address_v* remote );



        /// called when a network interface change happens

        virtual void onNetworkChange(

                const NetworkChangeInterface::NetworkChangeInfo& info);



private:

        /**

         * A link descriptor consisting of the end-point descriptor and currently

         * used underlay address.

         */

        class LinkDescriptor {

        public:



                /// default constructor

                LinkDescriptor() :

                        localLink(LinkID::UNSPECIFIED), localLocator(NULL),

                        remoteLink(LinkID::UNSPECIFIED), remoteLocator(NULL),

                        up(false) {

                }



                ~LinkDescriptor() {

                        if (localLocator!=NULL)  delete localLocator;

                        if (remoteLocator!=NULL) delete remoteLocator;

                }



                bool isUnspecified() const {

                        return (this == &UNSPECIFIED());

                }



                static LinkDescriptor& UNSPECIFIED(){

                        static LinkDescriptor* unspec = NULL;

                        if(unspec == NULL) unspec = new LinkDescriptor();

                        return *unspec;

                }



                bool unspecified;



                /// link identifiers

                LinkID localLink;

                LinkID remoteLink;



                /// used underlay addresses for the link

                const address_v* localLocator;

                const address_v* remoteLocator;



                /// the remote end-point descriptor

                EndpointDescriptor remoteEndpoint;



                /// flag, whether this link is up

                bool up;

        };



        /// Link management: list of links

        typedef vector<LinkDescriptor*> LinkSet;



        /// Link management: the set of currently managed links

        LinkSet linkSet;



        /// Link management: add a link

        void addLink( LinkDescriptor* link );



        /// Link management: remove a link

        void removeLink(const LinkID& localLink);



        /// Link management: get link information using the local link

        LinkDescriptor& queryLocalLink(const LinkID& localLink) const;



        /// Link management: get link information using the remote link

        LinkDescriptor& queryRemoteLink(const LinkID& remoteLink) const;



        /// The local end-point descriptor

        EndpointDescriptor localDescriptor;



#ifndef UNDERLAY_OMNET

        /// network change detector

        NetworkChangeDetection networkMonitor;

#endif

        /// list of all remote addresses of links to end-points

        class endpoint_reference {

        public:

                int count; ///< the number of open links to this end-point

                const address_v* endpoint; ///< the end-point itself

        };

        vector<endpoint_reference> remote_endpoints;



        /// adds an end-point to the list

        void add_endpoint( const address_v* endpoint );



        /// removes an end-point from the list

        void remove_endpoint( const address_v* endpoint );



        /// event listener

        typedef set<CommunicationEvents*> EventListenerSet;

        EventListenerSet eventListener;



        /// sequence numbers

        seqnum_t currentSeqnum;



        /// transport peer

        transport_peer* transport;



        /// the base overlay message receiver

        MessageReceiver* messageReceiver;



        /// convenience: send message to peer

        void send( Message* message, const EndpointDescriptor& endpoint );

        void send( Message* message, const LinkDescriptor& descriptor );







        /// state of the base communication

        bool started;



};



}} // namespace ariba, communication



#endif /* BASECOMMUNICATION_H_ */