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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2015
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef GECODE_SEARCH_SEQ_PBS_HH
#define GECODE_SEARCH_SEQ_PBS_HH
#include <gecode/search.hh>
namespace Gecode { namespace Search { namespace Seq {
/// Shared stop information
class SharedStopInfo {
public:
/// Whether search stopped because the slice is done
bool done;
/// The current failure limit, incremented for each slice
unsigned long long int l;
};
/// Stop object used for controlling slaves in a portfolio
class GECODE_SEARCH_EXPORT PortfolioStop : public Stop {
private:
/// The stop object for the slaves
Stop* so;
/// Pointer to shared stop information
SharedStopInfo* ssi;
public:
/// Initialize
PortfolioStop(Stop* so);
/// Initialize shared stop information
void share(SharedStopInfo* ssi);
/// Return true if portfolio engine must be stopped
virtual bool stop(const Statistics& s, const Options& o);
};
/// Runnable slave of a portfolio master
class Slave {
protected:
/// The slave engine
Engine* slave;
/// Stop object
Stop* stop;
public:
/// Default constructor
Slave(void);
/// Copy constructor
Slave(const Slave& s) = default;
/// Assignment operator
Slave& operator =(const Slave& s) = default;
/// Initialize with slave \a s and its stop object \a so
void init(Engine* s, Stop* so);
/// Return next solution
Space* next(void);
/// Return statistics of slave
Statistics statistics(void) const;
/// Check whether slave has been stopped
bool stopped(void) const;
/// Constrain with better solution \a b
void constrain(const Space& b);
/// Perform one run
void run(void);
/// Delete slave
~Slave(void);
};
/// Sequential portfolio engine implementation
template<bool best>
class GECODE_SEARCH_EXPORT PBS : public Engine {
protected:
/// Master statistics
Statistics stat;
/// Shared slave information
SharedStopInfo ssi;
/// Size of a slice
unsigned int slice;
/// Slaves
Slave* slaves;
/// Number of slave engines
unsigned int n_slaves;
/// Current slave to run
unsigned int cur;
/// Whether a slave has been stopped
bool slave_stop;
public:
/// Initialize
PBS(Engine** slaves, Stop** stops, unsigned int n,
const Statistics& stat, const Search::Options& opt);
/// Return next solution (nullptr, if none exists or search has been stopped)
virtual Space* next(void);
/// Return statistics
virtual Statistics statistics(void) const;
/// Check whether engine has been stopped
virtual bool stopped(void) const;
/// Constrain future solutions to be better than \a b
virtual void constrain(const Space& b);
/// Destructor
virtual ~PBS(void);
};
}}}
#include <gecode/search/seq/pbs.hpp>
#endif
// STATISTICS: search-seq
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