source: source/ariba/CommunicationListener.h@ 9633

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

#ifndef COMMUNICATIONLISTENER_H_
#define COMMUNICATIONLISTENER_H_

#include "Message.h"
#include "Identifiers.h"
#include "LinkProperties.h"
#include "DataMessage.h"

namespace ariba {

// forward decl
namespace overlay {
        class BaseOverlay;
}

/**
 * Listener for communication events on links.
 */
class CommunicationListener {

        friend class ariba::overlay::BaseOverlay;
        friend class Node;

public:
        static CommunicationListener DEFAULT; //< default implementation

protected:

        /**
         * Construct a communication listener
         */
        CommunicationListener();

        /**
         * Destruct a communication listener
         */
        virtual ~CommunicationListener();

        // --- link events ---

        /**
         * Event called when a link goes up
         * @param lnk The id of the link
         * @param remote The remote node where the link ends
         */
        virtual void onLinkUp(const LinkID& lnk, const NodeID& remote);

        /**
         * Event called when a link goes down
         * @param lnk The id of the link
         * @param remote The remote node where the link ends
         */
        virtual void onLinkDown(const LinkID& lnk, const NodeID& remote);

        /**
         * Event called when a link has changed,
         * e.g. through mobility
         * @param lnk The id of the link
         * @param remote The remote node where the link ends
         */
        virtual void onLinkChanged(const LinkID& lnk, const NodeID& remote);

        /**
         * Event called when a link has failed
         * @param lnk The id of the link
         * @param remote The remote node where the link ends
         */
        virtual void onLinkFail(const LinkID& lnk, const NodeID& remote);

        /**
         * Request from remote node to open up a link
         * @param remote The remote node that requests the new link
         */
        virtual bool onLinkRequest(const NodeID& remote);

        // --- general receive method ---

        /**
         * Called when a message is incoming
         * @param msg The data message that is received
         * @param remote The remote node that sent the message
         * @param lnk The link id of the link where the message is received
         */
        virtual void onMessage(const DataMessage& msg, const NodeID& remote,
                        const LinkID& lnk = LinkID::UNSPECIFIED);

        // --- dht functionality ---

        /**
         * Called when a key has been resolved in the DHT
         * @param key The key that was requested
         * @param value the data items the key was resolved to
         */
        virtual void onKeyValue( const Data& key, const vector<Data>& value );

};

} // namespace ariba

#endif /* COMMUNICATIONLISTENER_H_ */