DatagramConvergenceLayer.h

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/*
 * DatagramConvergenceLayer.h
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef DATAGRAMCONVERGENCELAYER_H_
#define DATAGRAMCONVERGENCELAYER_H_

#include "Component.h"
#include "net/DiscoveryBeaconHandler.h"
#include "net/DatagramService.h"
#include "net/DatagramConnection.h"
#include "net/ConvergenceLayer.h"
#include "core/EventReceiver.h"

#include <list>

namespace dtn
{
        namespace net
        {
                class DatagramConvergenceLayer : public dtn::net::ConvergenceLayer, public dtn::daemon::IndependentComponent,
                        public dtn::net::DatagramConnectionCallback, public DiscoveryBeaconHandler, public dtn::core::EventReceiver
                {
                        static const std::string TAG;

                public:
                        enum HEADER_FLAGS
                        {
                                HEADER_UNKOWN = 0,
                                HEADER_BROADCAST = 1,
                                HEADER_SEGMENT = 2,
                                HEADER_ACK = 4,
                                HEADER_NACK = 8
                        };

                        DatagramConvergenceLayer(DatagramService *ds);
                        virtual ~DatagramConvergenceLayer();

                        void raiseEvent(const dtn::core::Event *evt) throw ();

                        dtn::core::Node::Protocol getDiscoveryProtocol() const;

                        void queue(const dtn::core::Node &n, const dtn::net::BundleTransfer &job);

                        virtual const std::string getName() const;

                        virtual void resetStats();

                        virtual void getStats(ConvergenceLayer::stats_data &data) const;

                        void onAdvertiseBeacon(const ibrcommon::vinterface &iface, const DiscoveryBeacon &beacon) throw ();

                protected:
                        virtual void componentUp() throw ();
                        virtual void componentRun() throw ();
                        virtual void componentDown() throw ();
                        void __cancellation() throw ();
                        void callback_send(DatagramConnection &connection, const char &flags, const unsigned int &seqno, const std::string &destination, const char *buf, const dtn::data::Length &len) throw (DatagramException);

                        void callback_ack(DatagramConnection &connection, const unsigned int &seqno, const std::string &destination) throw (DatagramException);

                        void callback_nack(DatagramConnection &connection, const unsigned int &seqno, const std::string &destination) throw (DatagramException);

                        void connectionUp(const DatagramConnection *conn);
                        void connectionDown(const DatagramConnection *conn);

                        void reportSuccess(size_t retries, double rtt);
                        void reportFailure();

                        void receive() throw ();

                private:
                        class ConnectionNotAvailableException : public ibrcommon::Exception {
                        public:
                                ConnectionNotAvailableException(const std::string what = "connection not available")
                                 : ibrcommon::Exception(what) {
                                }

                                virtual ~ConnectionNotAvailableException() throw () {
                                }
                        };

                        class Receiver : public ibrcommon::JoinableThread {
                        public:
                                Receiver(DatagramConvergenceLayer &cl);
                                virtual ~Receiver();

                                void init() throw ();

                                void run() throw ();
                                void __cancellation() throw ();

                        private:
                                DatagramConvergenceLayer &_cl;
                        };

                        class Action {
                        public:
                                Action() {};
                                virtual ~Action() {};
                        };

                        class SegmentReceived : public Action {
                        public:
                                SegmentReceived(size_t maxlen) : seqno(0), flags(0), data(maxlen), len(0) {};
                                virtual ~SegmentReceived() {};

                                std::string address;
                                unsigned int seqno;
                                char flags;
                                std::vector<char> data;
                                size_t len;
                        };

                        class BeaconReceived : public Action {
                        public:
                                BeaconReceived() {};
                                virtual ~BeaconReceived() {};

                                std::string address;
                                DiscoveryBeacon data;
                        };

                        class AckReceived : public Action {
                        public:
                                AckReceived() : seqno(0) {};
                                virtual ~AckReceived() {};

                                std::string address;
                                unsigned int seqno;
                        };

                        class NackReceived : public Action {
                        public:
                                NackReceived() : seqno(0), temporary(false) {};
                                virtual ~NackReceived() {};

                                std::string address;
                                unsigned int seqno;
                                bool temporary;
                        };

                        class QueueBundle : public Action {
                        public:
                                QueueBundle(const BundleTransfer &bt) : job(bt) {};
                                virtual ~QueueBundle() {};

                                BundleTransfer job;
                                std::string uri;
                        };

                        class ConnectionDown : public Action {
                        public:
                                ConnectionDown() {};
                                virtual ~ConnectionDown() {};

                                std::string id;
                        };

                        class NodeGone : public Action {
                        public:
                                NodeGone() {};
                                virtual ~NodeGone() {};

                                dtn::data::EID eid;
                        };

                        class Shutdown : public Action {
                        public:
                                Shutdown() {};
                                virtual ~Shutdown() {};
                        };

                        DatagramConnection& getConnection(const std::string &identifier, bool create) throw (ConnectionNotAvailableException);

                        // associated datagram service
                        DatagramService *_service;

                        // this thread receives data from the datagram service
                        // and generates actions to process
                        Receiver _receiver;

                        // actions are queued here until they get processed
                        ibrcommon::Queue<Action*> _action_queue;

                        // on any send operation this mutex should be locked
                        ibrcommon::Mutex _send_lock;

                        // conditional to protect _active_conns
                        ibrcommon::Conditional _cond_connections;

                        typedef std::list<DatagramConnection*> connection_list;
                        connection_list _connections;

                        // false, if the main thread is cancelled
                        bool _running;

                        // stats variables
                        size_t _stats_in;
                        size_t _stats_out;
                        double _stats_rtt;
                        size_t _stats_retries;
                        size_t _stats_failure;
                };
        } /* namespace data */
} /* namespace dtn */
#endif /* DATAGRAMCONVERGENCELAYER_H_ */