HeavyTailBundleMaker.cc

// Copyright 2008 Michael Marsh, University of Maryland.
//
// This file is part of pydtn.
//
// pydtn is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// pydtn is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with pydtn.  If not, see <http://www.gnu.org/licenses/>.
//
// The views and conclusions contained in the software and documentation
// are those of the authors and should not be interpreted as representing
// official policies, either expressed or implied, of the University
// of Maryland.
//
// pydtn extends and embeds the Python interpreter, which is
// Copyright 2001-2006 Python Software Foundation, All Rights Reserved,
// and is released under the PSF License Agreement.
//
// RANLUX random number generation uses the Boost library,
// Copyright 1994-2006 by various authors (details in individual files),
// which is released under the Boost Software License, Version 1.0.

#include "simlpy/interpreter_defs.h"
#include "simlpy/interpreter_hooks.h"

#include "HeavyTailBundleMaker.h"
#include "WrapNode.h"
#include "MockBundle.h"
#include "BundleEvent.h"
#include "simlpy/Clock.h"
#include "simlpy/SimulationException.h"

HeavyTailBundleMaker::HeavyTailBundleMaker( WrapNode* source,
                                            WrapNode* destination,
                                            const DTN::ByteString& app,
                                            unsigned int size,
                                            double alpha ) :
   m_source( source ),
   m_destination( destination ),
   m_app( app ),
   m_size( size ),
   m_alpha( alpha )
{
   if ( 0 == m_source ) throw SimulationException( __FILE__ , __LINE__ );
   if ( 0 == m_destination ) throw SimulationException( __FILE__ , __LINE__ );
}

HeavyTailBundleMaker::~HeavyTailBundleMaker()
{
}

void
HeavyTailBundleMaker::generate()
{
   Time now = Clock::time();
   Time expire = now + m_source->bundleLifetime();
   double r = prng();
   double lr = -1.0 * ::log(r) / m_alpha;
   double x = ::exp(lr);
   long int size = (long int) ::floor(m_size*x);
   DTN::Bundle* b = new MockBundle( m_source->node().nextSeq(),
                                    m_source->addr(),
                                    m_destination->addr(),
                                    size,
                                    now.tv,
                                    expire.tv,
                                    DTN::Bundle::kData,
                                    m_app );
   Clock::schedule( new BundleEvent(m_source,m_source,now,now,b,true) );
}

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