MemoryBundleStorage.cpp

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/*
 * MemoryBundleStorage.cpp
 *
 * 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.
 *
 */

#include "storage/MemoryBundleStorage.h"
#include "core/EventDispatcher.h"
#include "core/BundleExpiredEvent.h"
#include "core/BundleEvent.h"

#include <ibrdtn/utils/Clock.h>

#include <ibrcommon/Logger.h>
#include <ibrcommon/thread/MutexLock.h>

namespace dtn
{
        namespace storage
        {
                const std::string MemoryBundleStorage::TAG = "MemoryBundleStorage";

                MemoryBundleStorage::MemoryBundleStorage(const dtn::data::Length maxsize)
                 : BundleStorage(maxsize), _list(this)
                {
                }

                MemoryBundleStorage::~MemoryBundleStorage()
                {
                }

                void MemoryBundleStorage::componentUp() throw ()
                {
                        // routine checked for throw() on 15.02.2013
                        dtn::core::EventDispatcher<dtn::core::TimeEvent>::add(this);
                }

                void MemoryBundleStorage::componentDown() throw ()
                {
                        // routine checked for throw() on 15.02.2013
                        dtn::core::EventDispatcher<dtn::core::TimeEvent>::remove(this);
                }

                void MemoryBundleStorage::raiseEvent(const dtn::core::TimeEvent &time) throw ()
                {
                        if (time.getAction() == dtn::core::TIME_SECOND_TICK)
                        {
                                // do expiration of bundles
                                ibrcommon::MutexLock l(_bundleslock);
                                _list.expire(time.getTimestamp());
                        }
                }

                const std::string MemoryBundleStorage::getName() const
                {
                        return MemoryBundleStorage::TAG;
                }

                bool MemoryBundleStorage::empty()
                {
                        ibrcommon::MutexLock l(_bundleslock);
                        return _bundles.empty();
                }

                void MemoryBundleStorage::releaseCustody(const dtn::data::EID&, const dtn::data::BundleID&)
                {
                        // custody is successful transferred to another node.
                        // it is safe to delete this bundle now. (depending on the routing algorithm.)
                }

                dtn::data::Size MemoryBundleStorage::count()
                {
                        ibrcommon::MutexLock l(_bundleslock);
                        return _bundles.size();
                }

                void MemoryBundleStorage::get(const BundleSelector &cb, BundleResult &result) throw (NoBundleFoundException, BundleSelectorException)
                {
                        size_t items_added = 0;

                        // we have to iterate through all bundles
                        ibrcommon::MutexLock l(_bundleslock);

                        for (prio_bundle_set::const_iterator iter = _priority_index.begin(); (iter != _priority_index.end()) && ((cb.limit() == 0) || (items_added < cb.limit())); ++iter)
                        {
                                const dtn::data::MetaBundle &bundle = (*iter);

                                // skip expired bundles
                                if ( dtn::utils::Clock::isExpired( bundle ) ) continue;

                                if ( cb.addIfSelected(result, bundle) ) items_added++;
                        }

                        if (items_added == 0) throw NoBundleFoundException();
                }

                dtn::data::Bundle MemoryBundleStorage::get(const dtn::data::BundleID &id)
                {
                        try {
                                ibrcommon::MutexLock l(_bundleslock);

                                for (bundle_list::const_iterator iter = _bundles.begin(); iter != _bundles.end(); ++iter)
                                {
                                        const dtn::data::Bundle &bundle = (*iter);
                                        if (id == bundle)
                                        {
                                                if (_faulty) {
                                                        throw dtn::SerializationFailedException("bundle get failed due to faulty setting");
                                                }

                                                return bundle;
                                        }
                                }
                        } catch (const dtn::SerializationFailedException &ex) {
                                // bundle loading failed
                                IBRCOMMON_LOGGER_TAG(MemoryBundleStorage::TAG, error) << "Error while loading bundle data: " << ex.what() << IBRCOMMON_LOGGER_ENDL;

                                // the bundle is broken, delete it
                                remove(id);

                                throw BundleStorage::BundleLoadException();
                        }

                        throw NoBundleFoundException();
                }

                const MemoryBundleStorage::eid_set MemoryBundleStorage::getDistinctDestinations()
                {
                        std::set<dtn::data::EID> ret;

                        ibrcommon::MutexLock l(_bundleslock);

                        for (bundle_list::const_iterator iter = _bundles.begin(); iter != _bundles.end(); ++iter)
                        {
                                const dtn::data::Bundle &bundle = (*iter);
                                ret.insert(bundle.destination);
                        }

                        return ret;
                }

                void MemoryBundleStorage::store(const dtn::data::Bundle &bundle)
                {
                        ibrcommon::MutexLock l(_bundleslock);

                        if (_faulty) return;

                        // get size of the bundle
                        dtn::data::DefaultSerializer s(std::cout);
                        dtn::data::Length size = s.getLength(bundle);

                        // increment the storage size
                        allocSpace(size);

                        // insert Container
                        pair<set<dtn::data::Bundle>::iterator,bool> ret = _bundles.insert( bundle );

                        if (ret.second)
                        {
                                const dtn::data::MetaBundle m = dtn::data::MetaBundle::create(bundle);
                                _list.add(m);
                                _priority_index.insert(m);

                                _bundle_lengths[m] = size;

                                // raise bundle added event
                                eventBundleAdded(m);
                        }
                        else
                        {
                                // free the previously allocated space
                                freeSpace(size);

                                IBRCOMMON_LOGGER_DEBUG_TAG(MemoryBundleStorage::TAG, 5) << "got bundle duplicate " << bundle.toString() << IBRCOMMON_LOGGER_ENDL;
                        }
                }

                bool MemoryBundleStorage::contains(const dtn::data::BundleID &id)
                {
                        ibrcommon::MutexLock l(_bundleslock);
                        return (_bundle_lengths.find(id) != _bundle_lengths.end());
                }

                dtn::data::MetaBundle MemoryBundleStorage::info(const dtn::data::BundleID &id)
                {
                        ibrcommon::MutexLock l(_bundleslock);

                        for (dtn::data::BundleList::const_iterator iter = _list.begin(); iter != _list.end(); ++iter)
                        {
                                const dtn::data::MetaBundle &meta = (*iter);
                                if (id == meta)
                                {
                                        return meta;
                                }
                        }

                        throw NoBundleFoundException();
                }

                void MemoryBundleStorage::remove(const dtn::data::BundleID &id)
                {
                        ibrcommon::MutexLock l(_bundleslock);

                        // search for the bundle in the bundle list
                        const bundle_list::const_iterator iter = find(_bundles.begin(), _bundles.end(), id);

                        // if no bundle was found throw an exception
                        if (iter == _bundles.end()) throw NoBundleFoundException();

                        // remove item in the bundlelist
                        const dtn::data::MetaBundle m = dtn::data::MetaBundle::create(*iter);
                        _list.remove(m);

                        // raise bundle removed event
                        eventBundleRemoved(m);

                        // erase the bundle
                        __erase(iter);
                }

                void MemoryBundleStorage::clear()
                {
                        ibrcommon::MutexLock l(_bundleslock);

                        for (bundle_list::const_iterator iter = _bundles.begin(); iter != _bundles.end(); ++iter)
                        {
                                const dtn::data::Bundle &bundle = (*iter);

                                // raise bundle removed event
                                eventBundleRemoved(bundle);
                        }

                        _bundles.clear();
                        _priority_index.clear();
                        _list.clear();
                        _bundle_lengths.clear();

                        // set the storage size to zero
                        clearSpace();
                }

                void MemoryBundleStorage::eventBundleExpired(const dtn::data::MetaBundle &b) throw ()
                {
                        // search for the bundle in the bundle list
                        const bundle_list::iterator iter = find(_bundles.begin(), _bundles.end(), b);

                        // if the bundle was found ...
                        if (iter != _bundles.end())
                        {
                                // raise bundle removed event
                                eventBundleRemoved(b);

                                // raise bundle event
                                dtn::core::BundleEvent::raise( b, dtn::core::BUNDLE_DELETED, dtn::data::StatusReportBlock::LIFETIME_EXPIRED);

                                // raise an event
                                dtn::core::BundleExpiredEvent::raise( b );

                                // erase the bundle
                                __erase(iter);
                        }
                }

                void MemoryBundleStorage::__erase(const bundle_list::iterator &iter)
                {
                        const dtn::data::MetaBundle m = dtn::data::MetaBundle::create(*iter);

                        // erase the bundle out of the priority index
                        _priority_index.erase(m);

                        // get the storage size of this bundle
                        dtn::data::Length len = _bundle_lengths[m];
                        _bundle_lengths.erase(m);

                        // decrement the storage size
                        freeSpace(len);

                        // remove bundle from bundle list
                        _bundles.erase(iter);
                }
        }
}