source: source/ariba/overlay/modules/OverlayInterface.h@ 5289

// [License]

// The Ariba-Underlay Copyright

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

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// UniversitÀt Karlsruhe (TH)

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// [License]



#ifndef __OVERLAY_INTERFACE_H

#define __OVERLAY_INTERFACE_H



#include "ariba/CommunicationListener.h"

#include "ariba/communication/EndpointDescriptor.h"

#include "ariba/overlay/modules/OverlayStructureEvents.h"

#include "ariba/utility/types/NodeID.h"

#include "ariba/utility/types/ServiceID.h"

#include "ariba/utility/types/OverlayParameterSet.h"



using ariba::CommunicationListener;

using ariba::communication::EndpointDescriptor;

using ariba::overlay::OverlayStructureEvents;

using ariba::utility::NodeID;

using ariba::utility::ServiceID;

using ariba::utility::OverlayParameterSet;



namespace ariba {

namespace overlay {



class BaseOverlay;



/**

 * This class declares an interface for an structured overlay.

 */

class OverlayInterface: public CommunicationListener {

        friend class BaseOverlay;



public:

        /**

         * A node list

         */

        typedef vector<NodeID> NodeList;



        /**

         * Constructs a new overlay.

         */

        OverlayInterface(

                        BaseOverlay& _baseoverlay,

                        const NodeID& _nodeid,

                        OverlayStructureEvents* _eventsReceiver,

                        OverlayParameterSet _parameters

                        );



        /**

         * Destrcuts the overlay.

         */

        virtual ~OverlayInterface();



        /**

         * Creates the overlay.

         */

        virtual void createOverlay() = 0;



        /**

         * Destroys the overlay.

         */

        virtual void deleteOverlay() = 0;



        /**

         * Joins the overlay. Starts integration and stabilization of the overlay

         * Node.

         *

         * @param bootstrap The bootstrap end-point descriptor or the default

         *    end-point, if this node is the initiator

         */

        virtual void joinOverlay(const EndpointDescriptor& bootstrap =

                EndpointDescriptor::UNSPECIFIED ) = 0;



        /**

         * Leaves the overlay gracefully.

         */

        virtual void leaveOverlay() = 0;



        /**

         * Resolves a overlay neighbor.

         *

         * @param node The node to resolve

         * @return Endpoint descriptor of local neighbor or UNSPECIFIED

         */

        virtual const EndpointDescriptor& resolveNode(const NodeID& node) = 0;



        /**

         * Routes a message to a given node by using overlay routing.

         *

         * @param destnode The destination node.

         * @param msg The message to be routed.

         */

        virtual void routeMessage(const NodeID& destnode, Message* msg) = 0;



        /**

         * Routes a message to a given node by using an existing link.

         *

         * TODO: This is a hack. This method allows the BaseOverlay class to

         * use overlay signaling links to transfer data for relaying

         *

         * @param node The destination node.

         * @param link An established link

         * @param msg The message to be sent.

         */

        virtual void routeMessage(const NodeID& node, const LinkID& link, Message* msg) = 0;



        /**

         * Returns the nodes known to this overlay.

         *

         * Usually this are the direct neighbors in the overlay structure.

         * For instance, Chord would return his predecessor, successor and finger

         * nodes. On the other hand OneHop would likely return all participating

         * nodes in the overlay.

         *

         * @return The list of all known nodes

         */

        virtual NodeList getKnownNodes() const = 0;



        /**

         * Returns the link id of the next hop a route message would take.

         *

         * @param id The destination node id

         * @return The link id of the next hop

         */

        virtual const LinkID& getNextLinkId( const NodeID& id ) const = 0;



        //--- functions from CommunicationListener that we _can_ use as overlay ---



        /// @see CommunicationListener

        virtual void onLinkUp(const LinkID& lnk, const NodeID& remote);



        /// @see CommunicationListener

        virtual void onLinkDown(const LinkID& lnk, const NodeID& remote);



        /// @see CommunicationListener

        virtual void onLinkChanged(const LinkID& lnk, const NodeID& remote);



        /// @see CommunicationListener

        virtual void onLinkFail(const LinkID& lnk, const NodeID& remote);



        /// @see CommunicationListener

        virtual void onLinkQoSChanged(const LinkID& lnk, const NodeID& remote,

                        const LinkProperties& prop);



        /// @see CommunicationListener

        virtual bool onLinkRequest(const NodeID& remote, const DataMessage& msg);



        /// @see CommunicationListener

        virtual void onMessage(const DataMessage& msg, const NodeID& remote,

                        const LinkID& lnk = LinkID::UNSPECIFIED);





        const OverlayParameterSet& getParameters() const;



protected:

        /// Reference to an active base overlay

        BaseOverlay& baseoverlay;



        /// The parameters of the overlay structure

        OverlayParameterSet parameters;



        /// The node identifier to use with this overlay

        const NodeID& nodeid;



        /// The listener used to inform about overlay structure changes

        OverlayStructureEvents* eventsReceiver;



        /// The service identifer of this overlay

        static ServiceID OVERLAY_SERVICE_ID;

};



}} // namespace ariba, overlay



#endif // __OVERLAY_INTERFACE_H