source: source/ariba/overlay/modules/OverlayInterface.h @ 5151

// [License]
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//
// Copyright (c) 2008-2009, Institute of Telematics, 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