FragmentManager.h

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/*
 * FragmentManager.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 FRAGMENTMANAGER_H_
#define FRAGMENTMANAGER_H_

#include "Component.h"
#include "core/EventReceiver.h"
#include "storage/BundleResult.h"
#include <ibrdtn/data/MetaBundle.h>
#include <ibrcommon/thread/Queue.h>
#include <ibrcommon/thread/Mutex.h>
#include <list>
#include <set>

namespace dtn
{
        namespace core
        {
                class FragmentationAbortedException : public ibrcommon::Exception
                {
                public:
                        FragmentationAbortedException(string what = "Fragmentation aborted.") throw() : ibrcommon::Exception(what)
                        {
                        }
                };

                class FragmentationProhibitedException : public FragmentationAbortedException
                {
                public:
                        FragmentationProhibitedException(string what = "Fragmentation is prohibited.") throw() : FragmentationAbortedException(what)
                        {
                        }
                };

                class FragmentationNotNecessaryException : public FragmentationAbortedException
                {
                public:
                        FragmentationNotNecessaryException(string what = "Fragmentation is not necessary.") throw() : FragmentationAbortedException(what)
                        {
                        }
                };

                class FragmentManager : public dtn::daemon::IndependentComponent, public dtn::core::EventReceiver
                {
                        static const std::string TAG;

                public:
                        FragmentManager();
                        virtual ~FragmentManager();

                        void signal(const dtn::data::MetaBundle &meta);

                        void __cancellation() throw ();

                        void componentUp() throw ();
                        void componentRun() throw ();
                        void componentDown() throw ();

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

                        const std::string getName() const;

                        static void setOffset(const dtn::data::EID &peer, const dtn::data::BundleID &id, const dtn::data::Length &abs_offset, const dtn::data::Length &frag_offset) throw ();

                        static dtn::data::Length getOffset(const dtn::data::EID &peer, const dtn::data::BundleID &id) throw ();

                        static void split(const dtn::data::Bundle &bundle, const dtn::data::Length &maxPayloadLength, std::list<dtn::data::Bundle> &fragments) throw (FragmentationAbortedException);

                private:
                        class Transmission
                        {
                        public:
                                Transmission();
                                virtual ~Transmission();

                                bool operator<(const Transmission &other) const;
                                bool operator==(const Transmission &other) const;

                                dtn::data::EID peer;
                                dtn::data::BundleID id;
                                dtn::data::Length offset;
                                dtn::data::Timestamp expires;
                        };

                        static void expire_offsets(const dtn::data::Timestamp &timestamp);
                        static dtn::data::Length get_payload_offset(const dtn::data::Bundle &bundle, const dtn::data::Length &abs_offset, const dtn::data::Length &frag_offset) throw ();

                        static void addBlocksFromBundleToFragment(const dtn::data::Bundle &bundle, dtn::data::Bundle &fragment, dtn::data::PayloadBlock &fragment_payloadBlock, bool isFirstFragment, bool isLastFragment);

                        // search for similar bundles in the storage
                        void search(const dtn::data::MetaBundle &meta, dtn::storage::BundleResult &list);

                        ibrcommon::Queue<dtn::data::MetaBundle> _incoming;
                        bool _running;

                        static ibrcommon::Mutex _offsets_mutex;
                        static std::set<Transmission> _offsets;
                };
        } /* namespace core */
} /* namespace dtn */
#endif /* FRAGMENTMANAGER_H_ */