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 "core/EventReceiver.h"
#include "net/DatagramService.h"
#include "net/DatagramConnection.h"
#include "net/ConvergenceLayer.h"
#include "net/DiscoveryAgent.h"
#include "net/DiscoveryServiceProvider.h"

#include <ibrcommon/thread/RWMutex.h>

#include <list>

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

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

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

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

                protected:
                        virtual void componentUp() throw ();
                        virtual void componentRun() throw ();
                        virtual void componentDown() throw ();
                        void __cancellation() throw ();

                        void sendAnnoucement();

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

                private:
                        DatagramConnection& getConnection(const std::string &identifier);

                        DatagramService *_service;

                        ibrcommon::Mutex _send_lock;

                        // this conditional must be locked when iterating over the
                        // list of connections
                        ibrcommon::Conditional _cond_connections;

                        // this lock is used to protect a connection reference from
                        // being deleted while using it
                        ibrcommon::RWMutex _mutex_connection;

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

                        bool _running;

                        uint16_t _discovery_sn;
                };
        } /* namespace data */
} /* namespace dtn */
#endif /* DATAGRAMCONVERGENCELAYER_H_ */