source: orxonox.OLD/orxonox/trunk/src/util/fast_factory.cc @ 4951

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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, or (at your option)
   any later version.

### File Specific:
   main-programmer: Benjamin Grauer
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_OBJECT_MANAGER

#include "fast_factory.h"
#include "compiler.h"
#include "debug.h"
#include "string.h"

using namespace std;

/**
 * Initializes a FastFactory
 * @param classID the ClassID this Class belongs to (the top-most)
 * @param fastFactoryName the Name of the ObjectClass-handled here
 * @return a new FastFactory
 */
FastFactory::FastFactory (ClassID classID, const char* fastFactoryName)
{
  this->setClassID(CL_FAST_FACTORY, "FastFactory");
  this->setName(fastFactoryName);

  this->storedClassID = classID;
  this->next = NULL;

  this->deadList = NULL;
  this->unusedContainers = NULL;

  this->storedDeadObjects = 0;

  FastFactory::registerFastFactory(this);
}

/** a reference to the First FastFactory */
FastFactory* FastFactory::first = NULL;

/**
 *  destructor
 * deletes all the Instances of the FastFactory.
 */
FastFactory::~FastFactory ()
{
  if (this == first)
    this->first = NULL;

  if (this->next)
    delete this->next;
}

/**
 * registers a Factory to the List of known factories.
 * @param fastFactory The factory to add
 *
 * needed, to step through all the FastFactories.
 */
void FastFactory::registerFastFactory(FastFactory* fastFactory)
{
  PRINTF(4)("Registered FastFactory for '%s'\n", fastFactory->getName());

  if( FastFactory::first == NULL)
    FastFactory::first = fastFactory;
  else
  {
    FastFactory* tmpFac = FastFactory::first;
    while( tmpFac->next != NULL)
      tmpFac = tmpFac->next;
    tmpFac->setNext(fastFactory);
  }
}


/**
 * searches for a FastFactory
 * @param classID the ClassID of the FastFactory to search for
 * @returns true if found, false otherwise.
 */
FastFactory* FastFactory::searchFastFactory(ClassID classID)
{
  if (FastFactory::first == NULL)
    return NULL;
  else
  {
    FastFactory* tmpFac = FastFactory::first;
    while (tmpFac != NULL)
    {
      if (tmpFac->storedClassID == classID)
        return tmpFac;
      tmpFac = tmpFac->next;
    }
  }
  return NULL;
}

/**
 * searches for a FastFactory
 * @param classID the ClassID of the FastFactory to search for
 * @returns true if found, false otherwise.
 */
FastFactory* FastFactory::searchFastFactory(const char* fastFactoryName)
{
  if (FastFactory::first == NULL)
    return NULL;
  else
  {
    FastFactory* tmpFac = FastFactory::first;
    while (tmpFac != NULL)
    {
      if (strcmp(tmpFac->getName(), fastFactoryName))
        return tmpFac;
      tmpFac = tmpFac->next;
    }
  }
  return NULL;
}

/**
 * Removes all the stored Containers, and sets the Lists back to emptienes.
 * @param hardFLUSH if true the containing Objects will also be deleted !! THIS IS DANGEROUS !!
 */
void FastFactory::flushAll(bool hardFLUSH)
{
  FastFactory* tmpFac = FastFactory::first;
  while (tmpFac != NULL)
  {
    tmpFac->flush(hardFLUSH);
    tmpFac = tmpFac->next;
  }
}


/**
 * ereases all the remaining containers, without deleting the stored Objects inside of them.
 * @param hardFLUSH if the the containing Objects will also be deleted !! THIS IS DANGEROUS !!
 */
void FastFactory::flush(bool hardFLUSH)
{
  FastObjectMember* tmpMember = this->deadList, *delMember = NULL;
  while (tmpMember != NULL)
  {
    delMember = tmpMember;
    tmpMember = tmpMember->next;
    if (unlikely(hardFLUSH == true))
      delete delMember->objectPointer;
    delete delMember;
  }
  this->deadList = NULL;

  tmpMember = this->unusedContainers;
  while (tmpMember != NULL)
  {
    delMember = tmpMember;
    tmpMember = tmpMember->next;
    delete delMember;
  }
  this->unusedContainers = NULL;
}

/**
 * generates count new Object of the Corresponding class. (precaching)
 * @param count How many instances of the class should be generated.
 */
void FastFactory::prepare(unsigned int count)
{
/*  if (this->storedDeadObjects + this->storedLivingObjects >= count)
  {
  PRINTF(3)("not creating new Objects for class %s, because the requested count already exists\n", this->getClassName());
}*/
  for (int i = this->storedDeadObjects; i < count; i++)
  {
    this->fabricate();
  }
}

/**
 * gives back live to one Object.
 * @return the Object to resurrect.
 */
BaseObject* FastFactory::resurrect()
{
  PRINTF(4)("Resurecting Object of type %s\n", this->getName());
  if (unlikely(this->deadList == NULL))
  {
    PRINTF(2)("The deadList of Class %s is empty, this may be either because it has not been filled yet, or the cache is to small.\n" \
        "Fabricating a new %s\n", this->getName(), this->getName());
    this->fabricate();
    return this->resurrect();
  }
  else
  {
    FastObjectMember* tmpC = this->deadList;
    this->deadList = this->deadList->next;

    tmpC->next = this->unusedContainers;
    this->unusedContainers = tmpC;

    return tmpC->objectPointer;
  }
}

/**
 * gives back live to one Object.
 * @param classID the class From which to resurrect an Object.
 * @return the Object to resurrect, NULL if classID is not found.
 */
BaseObject* FastFactory::resurrect(ClassID classID)
{
  FastFactory* tmpFac = FastFactory::getFirst();

  while (tmpFac != NULL)
  {
    if (classID == tmpFac->storedClassID)
      return tmpFac->resurrect();
    tmpFac = tmpFac->next;
  }
  return NULL;
}

/**
 * kills Object object, meaning, that it will be stored in the deadList of the FastFactory, and waiting for resurrection
 * @param object the Object to kill.
 *
 * synony that would be really grate would be abolish, but this is more like exterminate than pause-mode.
 */
void FastFactory::kill(BaseObject* object)
{
  FastObjectMember* tmpC;
  if (unlikely(this->unusedContainers == NULL))
  {
    tmpC = new FastObjectMember;
  }
  else
  {
    tmpC = this->unusedContainers;
    this->unusedContainers = this->unusedContainers->next;
  }

  tmpC->next = this->deadList;
  tmpC->objectPointer = object;
  this->deadList = tmpC;
}


void FastFactory::kill(BaseObject* object, bool searchForFastFactory)
{
  if (likely(searchForFastFactory == true))
  {
    FastFactory* tmpFac = FastFactory::first;
    while (tmpFac != NULL)
    {
      if (object->isA(tmpFac->storedClassID))
      {
        tmpFac->kill(object);
        return;
      }
      tmpFac = tmpFac->next;
    }

  }
}