source: source/ariba/overlay/modules/OverlayInterface.h@ 12772

// [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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// 1. Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// 2. Redistributions in binary form must reproduce the above copyright

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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

        );



        /**

         * Destructs 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;





        /**

         * Returns true if this is the closest node to the given node

         * identifier.

         *

         * @param node The node identifier to compare with

         * @return True if this is the closest node to the given node identifier

         */

        virtual bool isClosestNodeTo( const NodeID& node ) = 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(bool deep = true) 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;



    /**

     * Returns link ids of possible next hops a route message could take,

     * sorted by "quality" (e.g. overlay-distance).

     *

     * The »num« parameter can be used to specify the desired number of elements 

     * in the returned vector. This is intendet for optimizations. The

     * implementation may choose to return a different number of elements than

     * requested.

     * 

     * NOTE: The returned vector may contain »unspecified« links. These refer to 

     * to the own node. (e.g. If there's no closer node, the top element in the 

     * returned vector is unsoecified.)

     * 

     * @param id The destination node id

     * @param num The desired number of elements in the returned vector.

     *            (0 means »not specified/max)«

     * @return A sorted vector of link ids to possible next hops.

     */

    virtual std::vector<const LinkID*> getSortedLinkIdsTowardsNode(

        const NodeID& id, int num = 0 ) const = 0;



        /**

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

         * 

         * @param id The destination node id

         * @return The node id of the next hop

         */

        virtual const NodeID& getNextNodeId( 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(OverlayMsg* msg,

                reboost::shared_buffer_t sub_msg,

                const NodeID& remote,

                        const LinkID& lnk = LinkID::UNSPECIFIED);



        const OverlayParameterSet& getParameters() const;



        virtual std::string debugInformation() const;



protected:

        /// Reference to an active base overlay

        BaseOverlay& baseoverlay;



        /// The node identifier to use with this overlay

        const NodeID& nodeid;



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

        OverlayStructureEvents* eventsReceiver;



        /// The parameters of the overlay structure

        OverlayParameterSet parameters;



        /// The service identifer of this overlay

        static ServiceID OVERLAY_SERVICE_ID;

};



}} // namespace ariba, overlay



#endif // __OVERLAY_INTERFACE_H