source: source/ariba/overlay/BaseOverlay.h @ 4836

// [License]
// The Ariba-Underlay Copyright
//
// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
//
// Institute of Telematics
// UniversitÀt Karlsruhe (TH)
// Zirkel 2, 76128 Karlsruhe
// Germany
//
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// modification, are permitted provided that the following conditions are
// met:
//
// 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
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ARIBA PROJECT OR
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// are those of the authors and should not be interpreted as representing
// official policies, either expressed or implied, of the Institute of
// Telematics.
// [License]

#ifndef BASEOVERLAY_H_
#define BASEOVERLAY_H_

#include <map>
#include <iostream>
#include <algorithm>
#include <ctime>
#include <list>
#include <vector>
#include <deque>
#include <boost/foreach.hpp>

#include "ariba/utility/messages.h"
#include "ariba/utility/types.h"
#include "ariba/utility/misc/Helper.h"
#include "ariba/utility/misc/Demultiplexer.hpp"
#include "ariba/utility/logging/Logging.h"
#include "ariba/utility/system/Timer.h"

#include "ariba/communication/EndpointDescriptor.h"
#include "ariba/communication/BaseCommunication.h"
#include "ariba/communication/CommunicationEvents.h"

#include "ariba/overlay/modules/OverlayInterface.h"
#include "ariba/overlay/modules/OverlayFactory.h"
#include "ariba/overlay/modules/OverlayStructureEvents.h"
#include "ariba/overlay/OverlayBootstrap.h"

// forward declarations
namespace ariba {
  class NodeListener;
  class CommunicationListener;
  class SideportListener;
  namespace utility {
    class OvlVis;
  }
}

using std::vector;
using std::list;
using std::cout;
using std::map;
using std::make_pair;
using std::pair;
using std::find;
using std::deque;

// ariba interface
using ariba::NodeListener;
using ariba::CommunicationListener;

// overlay
using ariba::overlay::OverlayBootstrap;

// communication
using ariba::communication::EndpointDescriptor;
using ariba::communication::BaseCommunication;
using ariba::communication::CommunicationEvents;

// utilities
using ariba::utility::NodeID;
using ariba::utility::SpoVNetID;
using ariba::utility::LinkID;
using ariba::utility::Identifier;
using ariba::utility::ServiceID;
using ariba::utility::QoSParameterSet;
using ariba::utility::SecurityParameterSet;
using ariba::utility::Demultiplexer;
using ariba::utility::MessageReceiver;
using ariba::utility::MessageSender;
using ariba::utility::seqnum_t;
using ariba::utility::Timer;
using ariba::utility::OvlVis;

#define ovl OvlVis::instance()
#define ovlId OvlVis::NETWORK_ID_BASE_OVERLAY

namespace ariba {
namespace overlay {

class BaseOverlay: public MessageReceiver, public CommunicationEvents,
        public OverlayStructureEvents, protected Timer {

private:
        friend class OneHop;
        friend class Chord;

        use_logging_h( BaseOverlay );

public:

        /**
         * Constructs an empty non-functional base overlay instance
         */
        BaseOverlay();

        /**
         * Destructs a base overlay instance
         */
        virtual ~BaseOverlay();

        /**
         * Starts the Base Overlay instance
         */
        void start(BaseCommunication& _basecomm, const NodeID& _nodeid);

        /**
         * Stops the Base Overlay instance
         */
        void stop();

        /**
         * Starts a link establishment procedure to the specfied node
         * for the service with id service
         *
         * @param node Destination node id
         * @param service Service to connect to
         * @param linkid Link identifier to be used with this link
         */
        const LinkID establishLink(const NodeID& node, const ServiceID& service,
                        const LinkID& linkid = LinkID::UNSPECIFIED);

        /**
         * Starts a link establishment procedure to the specified
         *
         * endpoint and to the specified service
         */
        const LinkID establishLink(const EndpointDescriptor& ep,
                        const ServiceID& service, const LinkID& linkid =
                                        LinkID::UNSPECIFIED);

        /// drops a link
        void dropLink(const LinkID& link);

        /// sends a message over an existing link
        seqnum_t sendMessage(const Message* message, const LinkID& link);

        /// sends a message to a node and a specific service
        seqnum_t sendMessage(const Message* message, const NodeID& node,
                        const ServiceID& service);

        /**
         * Send out a message to all nodes that are known in the overlay structure.
         * Depending on the structure of the overlay, this can be very different.
         */
        void broadcastMessage(Message* message, const ServiceID& service);

        /**
         * Returns the end-point descriptor of a link.
         *
         * @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 a list of overlay neighbors.
         *
         * @return A list of overlay neighbors.
         */
        vector<NodeID> getOverlayNeighbors() const;

        /**
         * Returns a end-endpoint descriptor of a overlay neighbor.
         * If the node is not known -- an unspecified endpoint descriptor is
         * returned.
         *
         * @param node The node identifer of a overlay neighbor.
         * @return The end-point descriptor of the node or unspecified.
         */
        const EndpointDescriptor& getEndpointDescriptor(const NodeID& node) const;

        // TODO: Doc
        bool bind(CommunicationListener* listener, const ServiceID& sid);

        // TODO: Doc
        bool unbind(CommunicationListener* listener, const ServiceID& sid);

        // TODO: Doc
        bool bind(NodeListener* listener);

        // TODO: Doc
        bool unbind(NodeListener* listener);

        // TODO: Doc
        bool registerSidePort(SideportListener* _sideport);

        // TODO: Doc
        bool unregisterSidePort(SideportListener* _sideport);

        /**
         * Returns the own nodeID or the NodeID of the specified link
         *
         * @param lid The link identifier
         * @return The NodeID of the link
         */
        const NodeID& getNodeID(const LinkID& lid = LinkID::UNSPECIFIED) const;

        /**
         * Return all Links for the specified remote nodeid, or all links when
         * the node id given is set to unspecified
         *
         * @param nid The node id to request links for, or unspecified for all links
         * @return a vector that contains all the link ids requested
         */
        vector<LinkID> getLinkIDs(const NodeID& nid = NodeID::UNSPECIFIED) const;

        /**
         * Join a existing sponaneous virtual network (spovnet).
         *
         * @param id A spovnet identifier
         * @param boot A bootstrap node
         */
        void joinSpoVNet(const SpoVNetID& id, const EndpointDescriptor& boot );

        /**
         * Initiates a new spontaneous virtual network.
         * This makes this BaseOverlay to the SpoVNet-Initiator.
         *
         * @param id The spovnet identifier
         */
        void createSpoVNet(const SpoVNetID& id, const OverlayParameterSet& param =
                        OverlayParameterSet::DEFAULT, const SecurityParameterSet& sec =
                        SecurityParameterSet::DEFAULT, const QoSParameterSet& qos =
                        QoSParameterSet::DEFAULT);

        /**
         * Let the node leave the SpoVNet.
         */
        void leaveSpoVNet();

protected:

        /**
         * @see ariba::communication::CommunicationEvents.h
         */
        virtual void onLinkUp(const LinkID& id, const NetworkLocator* local,
                        const NetworkLocator* remote);

        /**
         * @see ariba::communication::CommunicationEvents.h
         */
        virtual void onLinkDown(const LinkID& id, const NetworkLocator* local,
                        const NetworkLocator* remote);

        /**
         * @see ariba::communication::CommunicationEvents.h
         */
        virtual void onLinkChanged(const LinkID& id,
                        const NetworkLocator* oldlocal, const NetworkLocator* newlocal,
                        const NetworkLocator* oldremote, const NetworkLocator* newremote);

        /**
         * @see ariba::communication::CommunicationEvents.h
         */
        virtual void onLinkFail(const LinkID& id, const NetworkLocator* local,
                        const NetworkLocator* remote);

        /**
         * @see ariba::communication::CommunicationEvents.h
         */
        virtual void onLinkQoSChanged(const LinkID& id,
                        const NetworkLocator* local, const NetworkLocator* remote,
                        const QoSParameterSet& qos);

        /**
         * @see ariba::communication::CommunicationEvents.h
         */
        virtual bool onLinkRequest(const LinkID& id, const NetworkLocator* local,
                        const NetworkLocator* remote);

        //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

        /**
         * Processes a received message.
         *
         * Beware: nodeid is not valid in this case! (since this class implements
         * nodeid's in the first place *g*)
         */
        virtual bool receiveMessage(
                const Message* message, const LinkID& link,     const NodeID&);

        //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

        /**
         * This method is called, when a routed message arrives from the
         * overlay.
         *
         * @see OverlayStructureEvents.h
         */
        virtual void incomingRouteMessage(Message* msg);

        /**
         * This method is called, when a new node joined the network
         *
         * @see OverlayStructureEvents.h
         */
        virtual void onNodeJoin(const NodeID& node);

        /**
         * Timer Event method
         */
        virtual void eventFunction();

private:
        /**
         * The BaseCommunication the BaseOverlay
         * communicates over
         */
        BaseCommunication* bc;

        /**
         * The nodeid of this BaseOverlay instance.
         */
        NodeID nodeId;

        /**
         * The SpoVNetID that we are joined to
         * or that we have created.
         */
        SpoVNetID spovnetId;

        /**
         * TODO
         */
        Demultiplexer<CommunicationListener*, ServiceID> communicationListeners;

        /**
         * TODO
         */
        typedef vector<NodeListener*> NodeListenerVector;

        /**
         * TODO
         */
        NodeListenerVector nodeListeners;

        /**
         * TODO
         */
        SideportListener* sideport;

        /**
         * The abstract overlay interface that implements
         * the overlay specific functionality.
         */
        OverlayInterface* overlayInterface;

        /**
         * The special link to the Initiator of the SpoVNet
         * or LinkID::UNDEFINED if we are the Initiator
         */
        LinkID initiatorLink;

        /**
         * The state of the BaseOverlay
         */
        typedef enum _BaseOverlayState {
                BaseOverlayStateInvalid = 0,
                BaseOverlayStateInitiator = 1,
                BaseOverlayStateJoinInitiated = 2,
                BaseOverlayStateCompleted = 3,
        } BaseOverlayState;

        /**
         * TODO
         */
        BaseOverlayState state;

        /**
         * The initiator node
         */
        NodeID spovnetInitiator;

        /**
         * OvlVis
         */
        NodeID min, max;
        NodeID succ, pred;
        void updateOvlVis(const NodeID& node);

        /**
         * Link management
         */
        class LinkItem {
        public:
                static const LinkItem UNSPECIFIED;

                LinkItem() :
                        link(LinkID::UNSPECIFIED),
                        node(NodeID::UNSPECIFIED),
                        service(ServiceID::UNSPECIFIED),
                        interface(&CommunicationListener::DEFAULT),
                        autolink(false),
                        lastuse(0),
                        linkup(false){
                }

                LinkItem(const LinkID& _link, const NodeID& _node,
                                const ServiceID& _service, CommunicationListener* _interface) :
                        link(_link),
                        node(_node),
                        service(_service),
                        interface(_interface),
                        autolink(false),
                        lastuse(time(NULL)),
                        linkup(false){

                        assert( _interface != NULL );
                }

                LinkItem(const LinkItem& rh) :
                        link(rh.link),
                        node(rh.node),
                        service(rh.service),
                        interface(rh.interface),
                        autolink(rh.autolink),
                        lastuse(rh.lastuse),
                        linkup(rh.linkup){

                        BOOST_FOREACH( Message* msg, rh.waitingmsg ){
                                waitingmsg.push_back( msg );
                        }
                }

                void deleteWaiting(){
                        BOOST_FOREACH( Message* msg, waitingmsg ){
                                delete msg;
                        }
                        waitingmsg.clear();
                }

                // general information about the link
                const LinkID link;
                NodeID node;
                ServiceID service;
                CommunicationListener* interface;
                bool linkup;

                // information needed for auto links
                void markused() {
                        lastuse = time(NULL);
                }

                bool autolink;
                time_t lastuse;
                deque<Message*> waitingmsg;
        };

        typedef map<const LinkID, LinkItem> LinkMapping;
        typedef pair<const LinkID, LinkItem> LinkPair;
        LinkMapping linkMapping;

        // map of a link request map a nonce to a LinkID
        typedef map<const uint32_t, LinkID> PendingLinkMap;
        PendingLinkMap pendingLinks;

        /**
         * nodes with pending joines. TODO: should be cleaned every
         * some seconds, add timestamps to each, and check on occasion
         */
        typedef vector<NodeID> JoiningNodes;
        JoiningNodes joiningNodes;

        /**
         * Bootstrapper for our spovnet
         */
        OverlayBootstrap overlayBootstrap;
};

}} // namespace ariba, overlay

#endif /*BASEOVERLAY_H_*/