backcaller.h

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/***************************************************************************
 *   Copyright (C) 2005 by Robot Group Leipzig                             *
 *    martius@informatik.uni-leipzig.de                                    *
 *    fhesse@informatik.uni-leipzig.de                                     *
 *    der@informatik.uni-leipzig.de                                        *
 *    guettler@informatik.uni-leipzig.de                                   *
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************
 *                                                                         *
 *  DESCRIPTION                                                            *
 *  Uses design pattern mediator:                                          *
 *  BackCaller - subject and changemanager (combined)              *
 *  Callbackable       - observer                                          *
 *                                                                         *
 *  $Log: backcaller.h,v $
 *  Revision 1.1  2009/08/10 07:31:04  guettler
 *  -new BackCaller class to provide common
 *    functions used for callback
 *  -Callbackable interface modified
 *  -callBack now supports different types
 *    of CallBackable types
 *                                                                                 *
 *                                                                         *
 **************************************************************************/
#ifndef __BACKCALLER_H_
#define __BACKCALLER_H_

#include <vector>
#include <ext/hash_map>


class Callbackable;

/**
 * Class prototype which provides functions to handle callbackable classes.
 * If a class implements this class, just use the function callBack which
 * calls all registered callbackable classes.
 * If you use different callbackable pools, just use the overloaded functions
 * callBack(CallbackableType type),
 * addCallbackable(CallbackableType, Callbackable* cb) and
 * removeCallbackable(CallbackableType, Callbackable* cb).
 */
class BackCaller
{
  public:
    typedef unsigned long CallbackableType;

    /**
     * This is the default Callbackable type.
     * If you derive from BackCaller, just define your own CallbackableTypes.
     */
    static const CallbackableType DEFAULT_CALLBACKABLE_TYPE = 0;

    BackCaller();
    virtual ~BackCaller();

    /**
     * Adds a Callbackable instance to this caller instance.
     * @param type the desired CallbackableType of the Callbackable class.
     * @param callbackableInstance the instance to add
     */
    virtual void addCallbackable(Callbackable* callbackableInstance, CallbackableType type = BackCaller::DEFAULT_CALLBACKABLE_TYPE);

    /**
     * Removes a Callbackable instance from this caller instance.
     * @param type the CallbackableType of the Callbackable class.
     * @param callbackableInstance
     */
    virtual void removeCallbackable(Callbackable* callbackableInstance, CallbackableType type = BackCaller::DEFAULT_CALLBACKABLE_TYPE);

    /**
     * Removes all Callbackable instances from this caller instance
     * @param type the CallbackableType of the Callbackable class to be removed.
     */
    virtual void removeAllCallbackables(CallbackableType type /* = BackCaller::DEFAULT_CALLBACKABLE_TYPE */);


    /**
     * Calls all registered callbackable classes of the determined type.
     * This is done by Callbackable::doOnCallback(CallbackableType type).
     * You can make this function private/protected if you like.
     * @param type the CallbackableType of the Callbackable classes.
     */
    virtual void callBack(CallbackableType type = BackCaller::DEFAULT_CALLBACKABLE_TYPE);

    /**
     * Calls all registered callbackable classes of the determined type.
     * This is done by Callbackable::doOnCallback(CallbackableType type).
     * This function uses QUICKMP in order to parallelise the callbacks.
     * Remember that there is only shared the used CallbackableList. So if you
     * have other variables/objects to share, implement your own version.
     * You can make this function private/protected if you like.
     * @param type the CallbackableType of the Callbackable classes.
     */
    virtual void callBackQMP(CallbackableType type = BackCaller::DEFAULT_CALLBACKABLE_TYPE);

  private:
    struct CallbackableTypeHash
    {
      size_t operator() (const CallbackableType& type) const { return type; }
    };

    typedef std::vector<Callbackable*> callbackableListType;
    typedef __gnu_cxx::hash_map<CallbackableType, callbackableListType*, CallbackableTypeHash> callbackableMapType;
    /**
     * This hashmap holds every list of Callbackables for each CallbackableType.
     */
    callbackableMapType callbackableMap;
};

#endif /* __BACKCALLER_H_ */

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