scip_event.h

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/*         SCIP --- Solving Constraint Integer Programs                      */
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/*  Copyright 2002-2022 Zuse Institute Berlin                                */
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/**@file   scip_event.h
 * @ingroup PUBLICCOREAPI
 * @brief  public methods for event handler plugins and event handlers
 * @author Tobias Achterberg
 * @author Timo Berthold
 * @author Thorsten Koch
 * @author Alexander Martin
 * @author Marc Pfetsch
 * @author Kati Wolter
 * @author Gregor Hendel
 * @author Leona Gottwald
 */

/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/

#ifndef __SCIP_SCIP_EVENT_H__
#define __SCIP_SCIP_EVENT_H__


#include "scip/def.h"
#include "scip/type_event.h"
#include "scip/type_lp.h"
#include "scip/type_retcode.h"
#include "scip/type_scip.h"
#include "scip/type_var.h"

#ifdef __cplusplus
extern "C" {
#endif

/**@addtogroup PublicEventHandlerMethods
 *
 * @{
 */

/** creates an event handler and includes it in SCIP
 *
 *  @note method has all event handler callbacks as arguments and is thus changed every time a new
 *        callback is added in future releases; consider using SCIPincludeEventhdlrBasic() and setter functions
 *        if you seek for a method which is less likely to change in future releases
 */
SCIP_EXPORT
SCIP_RETCODE SCIPincludeEventhdlr(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name,               /**< name of event handler */
   const char*           desc,               /**< description of event handler */
   SCIP_DECL_EVENTCOPY   ((*eventcopy)),     /**< copy method of event handler or NULL if you don't want to copy your plugin into sub-SCIPs */
   SCIP_DECL_EVENTFREE   ((*eventfree)),     /**< destructor of event handler */
   SCIP_DECL_EVENTINIT   ((*eventinit)),     /**< initialize event handler */
   SCIP_DECL_EVENTEXIT   ((*eventexit)),     /**< deinitialize event handler */
   SCIP_DECL_EVENTINITSOL((*eventinitsol)),  /**< solving process initialization method of event handler */
   SCIP_DECL_EVENTEXITSOL((*eventexitsol)),  /**< solving process deinitialization method of event handler */
   SCIP_DECL_EVENTDELETE ((*eventdelete)),   /**< free specific event data */
   SCIP_DECL_EVENTEXEC   ((*eventexec)),     /**< execute event handler */
   SCIP_EVENTHDLRDATA*   eventhdlrdata       /**< event handler data */
   );

/** creates an event handler and includes it in SCIP with all its non-fundamental callbacks set
 *  to NULL; if needed, non-fundamental callbacks can be set afterwards via setter functions
 *  SCIPsetEventhdlrCopy(), SCIPsetEventhdlrFree(), SCIPsetEventhdlrInit(), SCIPsetEventhdlrExit(),
 *  SCIPsetEventhdlrInitsol(), SCIPsetEventhdlrExitsol(), and SCIPsetEventhdlrDelete()
 *
 *  @note if you want to set all callbacks with a single method call, consider using SCIPincludeEventhdlr() instead
 */
SCIP_EXPORT
SCIP_RETCODE SCIPincludeEventhdlrBasic(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_EVENTHDLR**      eventhdlrptr,       /**< reference to an event handler, or NULL */
   const char*           name,               /**< name of event handler */
   const char*           desc,               /**< description of event handler */
   SCIP_DECL_EVENTEXEC   ((*eventexec)),     /**< execute event handler */
   SCIP_EVENTHDLRDATA*   eventhdlrdata       /**< event handler data */
   );

/** sets copy callback of the event handler */
SCIP_EXPORT
SCIP_RETCODE SCIPsetEventhdlrCopy(
   SCIP*                 scip,               /**< scip instance */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler */
   SCIP_DECL_EVENTCOPY   ((*eventcopy))      /**< copy callback of the event handler */
   );

/** sets deinitialization callback of the event handler */
SCIP_EXPORT
SCIP_RETCODE SCIPsetEventhdlrFree(
   SCIP*                 scip,               /**< scip instance */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler */
   SCIP_DECL_EVENTFREE   ((*eventfree))      /**< deinitialization callback of the event handler */
   );

/** sets initialization callback of the event handler */
SCIP_EXPORT
SCIP_RETCODE SCIPsetEventhdlrInit(
   SCIP*                 scip,               /**< scip instance */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler */
   SCIP_DECL_EVENTINIT   ((*eventinit))      /**< initialize event handler */
   );

/** sets deinitialization callback of the event handler */
SCIP_EXPORT
SCIP_RETCODE SCIPsetEventhdlrExit(
   SCIP*                 scip,               /**< scip instance */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler */
   SCIP_DECL_EVENTEXIT   ((*eventexit))      /**< deinitialize event handler */
   );

/** sets solving process initialization callback of the event handler */
SCIP_EXPORT
SCIP_RETCODE SCIPsetEventhdlrInitsol(
   SCIP*                 scip,               /**< scip instance */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler */
   SCIP_DECL_EVENTINITSOL((*eventinitsol))   /**< solving process initialization callback of event handler */
   );

/** sets solving process deinitialization callback of the event handler */
SCIP_EXPORT
SCIP_RETCODE SCIPsetEventhdlrExitsol(
   SCIP*                 scip,               /**< scip instance */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler */
   SCIP_DECL_EVENTEXITSOL((*eventexitsol))   /**< solving process deinitialization callback of event handler */
   );

/** sets callback of the event handler to free specific event data */
SCIP_EXPORT
SCIP_RETCODE SCIPsetEventhdlrDelete(
   SCIP*                 scip,               /**< scip instance */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler */
   SCIP_DECL_EVENTDELETE ((*eventdelete))    /**< free specific event data */
   );

/** returns the event handler of the given name, or NULL if not existing */
SCIP_EXPORT
SCIP_EVENTHDLR* SCIPfindEventhdlr(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name                /**< name of event handler */
   );

/** returns the array of currently available event handlers */
SCIP_EXPORT
SCIP_EVENTHDLR** SCIPgetEventhdlrs(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** returns the number of currently available event handlers */
SCIP_EXPORT
int SCIPgetNEventhdlrs(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** @} */

/**@addtogroup PublicEventMethods
 *
 * @{
 */

/** catches a global (not variable or row dependent) event
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
SCIP_EXPORT
SCIP_RETCODE SCIPcatchEvent(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_EVENTTYPE        eventtype,          /**< event type mask to select events to catch */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler to process events with */
   SCIP_EVENTDATA*       eventdata,          /**< event data to pass to the event handler when processing this event */
   int*                  filterpos           /**< pointer to store position of event filter entry, or NULL */
   );

/** drops a global event (stops to track event)
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
SCIP_EXPORT
SCIP_RETCODE SCIPdropEvent(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_EVENTTYPE        eventtype,          /**< event type mask of dropped event */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler to process events with */
   SCIP_EVENTDATA*       eventdata,          /**< event data to pass to the event handler when processing this event */
   int                   filterpos           /**< position of event filter entry returned by SCIPcatchEvent(), or -1 */
   );

/** catches an objective value or domain change event on the given transformed variable
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
SCIP_EXPORT
SCIP_RETCODE SCIPcatchVarEvent(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR*             var,                /**< transformed variable to catch event for */
   SCIP_EVENTTYPE        eventtype,          /**< event type mask to select events to catch */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler to process events with */
   SCIP_EVENTDATA*       eventdata,          /**< event data to pass to the event handler when processing this event */
   int*                  filterpos           /**< pointer to store position of event filter entry, or NULL */
   );

/** drops an objective value or domain change event (stops to track event) on the given transformed variable
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
SCIP_EXPORT
SCIP_RETCODE SCIPdropVarEvent(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR*             var,                /**< transformed variable to drop event for */
   SCIP_EVENTTYPE        eventtype,          /**< event type mask of dropped event */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler to process events with */
   SCIP_EVENTDATA*       eventdata,          /**< event data to pass to the event handler when processing this event */
   int                   filterpos           /**< position of event filter entry returned by SCIPcatchVarEvent(), or -1 */
   );

/** catches a row coefficient, constant, or side change event on the given row
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
SCIP_EXPORT
SCIP_RETCODE SCIPcatchRowEvent(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_ROW*             row,                /**< linear row to catch event for */
   SCIP_EVENTTYPE        eventtype,          /**< event type mask to select events to catch */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler to process events with */
   SCIP_EVENTDATA*       eventdata,          /**< event data to pass to the event handler when processing this event */
   int*                  filterpos           /**< pointer to store position of event filter entry, or NULL */
   );

/** drops a row coefficient, constant, or side change event (stops to track event) on the given row
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
SCIP_EXPORT
SCIP_RETCODE SCIPdropRowEvent(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_ROW*             row,                /**< linear row to drop event for */
   SCIP_EVENTTYPE        eventtype,          /**< event type mask of dropped event */
   SCIP_EVENTHDLR*       eventhdlr,          /**< event handler to process events with */
   SCIP_EVENTDATA*       eventdata,          /**< event data to pass to the event handler when processing this event */
   int                   filterpos           /**< position of event filter entry returned by SCIPcatchVarEvent(), or -1 */
   );

/**@} */

#ifdef __cplusplus
}
#endif

#endif