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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