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/* $Id: ClpEventHandler.hpp 2156 2015-08-07 14:51:42Z forrest $ */
// Copyright (C) 2004, International Business Machines
// Corporation and others. All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).
#ifndef ClpEventHandler_H
#define ClpEventHandler_H
#include "ClpSimplex.hpp"
/** Base class for Clp event handling
This is just here to allow for event handling. By event I mean a Clp event
e.g. end of values pass.
One use would be to let a user handle a system event e.g. Control-C. This could be done
by deriving a class MyEventHandler which knows about such events. If one occurs
MyEventHandler::event() could clear event status and return 3 (stopped).
Clp would then return to user code.
As it is called every iteration this should be fine grained enough.
User can derive and construct from CbcModel - not pretty
*/
class ClpEventHandler {
public:
/** enums for what sort of event.
These will also be returned in ClpModel::secondaryStatus() as int
*/
enum Event {
endOfIteration = 100, // used to set secondary status
endOfFactorization, // after gutsOfSolution etc
endOfValuesPass,
node, // for Cbc
treeStatus, // for Cbc
solution, // for Cbc
theta, // hit in parametrics
pivotRow, // used to choose pivot row
presolveStart, // ClpSolve presolve start
presolveSize, // sees if ClpSolve presolve too big or too small
presolveInfeasible, // ClpSolve presolve infeasible
presolveBeforeSolve, // ClpSolve presolve before solve
presolveAfterFirstSolve, // ClpSolve presolve after solve
presolveAfterSolve, // ClpSolve presolve after solve
presolveEnd, // ClpSolve presolve end
goodFactorization, // before gutsOfSolution
complicatedPivotIn, // in modifyCoefficients
noCandidateInPrimal, // tentative end
looksEndInPrimal, // About to declare victory (or defeat)
endInPrimal, // Victory (or defeat)
beforeStatusOfProblemInPrimal,
startOfStatusOfProblemInPrimal,
complicatedPivotOut, // in modifyCoefficients
noCandidateInDual, // tentative end
looksEndInDual, // About to declare victory (or defeat)
endInDual, // Victory (or defeat)
beforeStatusOfProblemInDual,
startOfStatusOfProblemInDual,
startOfIterationInDual,
updateDualsInDual,
endOfCreateRim,
slightlyInfeasible,
modifyMatrixInMiniPresolve,
moreMiniPresolve,
modifyMatrixInMiniPostsolve,
startOfCrossover, // in Idiot
noTheta // At end (because no pivot)
};
/**@name Virtual method that the derived classes should provide.
The base class instance does nothing and as event() is only useful method
it would not be very useful NOT providing one!
*/
//@{
/** This can do whatever it likes. If return code -1 then carries on
if 0 sets ClpModel::status() to 5 (stopped by event) and will return to user.
At present if <-1 carries on and if >0 acts as if 0 - this may change.
For ClpSolve 2 -> too big return status of -2 and -> too small 3
*/
virtual int event(Event whichEvent);
/** This can do whatever it likes. Return code -1 means no action.
This passes in something
*/
virtual int eventWithInfo(Event whichEvent, void * info) ;
//@}
/**@name Constructors, destructor */
//@{
/** Default constructor. */
ClpEventHandler(ClpSimplex * model = NULL);
/** Destructor */
virtual ~ClpEventHandler();
// Copy
ClpEventHandler(const ClpEventHandler&);
// Assignment
ClpEventHandler& operator=(const ClpEventHandler&);
/// Clone
virtual ClpEventHandler * clone() const;
//@}
/**@name Sets/gets */
//@{
/** set model. */
void setSimplex(ClpSimplex * model);
/// Get model
inline ClpSimplex * simplex() const {
return model_;
}
//@}
protected:
/**@name Data members
The data members are protected to allow access for derived classes. */
//@{
/// Pointer to simplex
ClpSimplex * model_;
//@}
};
/** Base class for Clp disaster handling
This is here to allow for disaster handling. By disaster I mean that Clp
would otherwise give up
*/
class ClpDisasterHandler {
public:
/**@name Virtual methods that the derived classe should provide.
*/
//@{
/// Into simplex
virtual void intoSimplex() = 0;
/// Checks if disaster
virtual bool check() const = 0;
/// saves information for next attempt
virtual void saveInfo() = 0;
/// Type of disaster 0 can fix, 1 abort
virtual int typeOfDisaster();
//@}
/**@name Constructors, destructor */
//@{
/** Default constructor. */
ClpDisasterHandler(ClpSimplex * model = NULL);
/** Destructor */
virtual ~ClpDisasterHandler();
// Copy
ClpDisasterHandler(const ClpDisasterHandler&);
// Assignment
ClpDisasterHandler& operator=(const ClpDisasterHandler&);
/// Clone
virtual ClpDisasterHandler * clone() const = 0;
//@}
/**@name Sets/gets */
//@{
/** set model. */
void setSimplex(ClpSimplex * model);
/// Get model
inline ClpSimplex * simplex() const {
return model_;
}
//@}
protected:
/**@name Data members
The data members are protected to allow access for derived classes. */
//@{
/// Pointer to simplex
ClpSimplex * model_;
//@}
};
#endif
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