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The Jadex BDI applications package contain
several example applications, benchmarks and
testcases using BDI agents.
The newest version!
package jadex.bdi.examples.hunterprey_classic.environment;
import jadex.bdi.examples.hunterprey_classic.Creature;
import jadex.bdi.examples.hunterprey_classic.Food;
import jadex.bdi.examples.hunterprey_classic.Hunter;
import jadex.bdi.examples.hunterprey_classic.IEnvironment;
import jadex.bdi.examples.hunterprey_classic.Location;
import jadex.bdi.examples.hunterprey_classic.Observer;
import jadex.bdi.examples.hunterprey_classic.Obstacle;
import jadex.bdi.examples.hunterprey_classic.Prey;
import jadex.bdi.examples.hunterprey_classic.RequestMove;
import jadex.bdi.examples.hunterprey_classic.TaskInfo;
import jadex.bdi.examples.hunterprey_classic.Vision;
import jadex.bdi.examples.hunterprey_classic.WorldObject;
import jadex.commons.SUtil;
import jadex.commons.SimplePropertyChangeSupport;
import jadex.commons.collection.MultiCollection;
import jadex.xml.bean.JavaReader;
import jadex.xml.bean.JavaWriter;
import jadex.commons.beans.PropertyChangeListener;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
/**
* The environment is the container all objects and creatures.
*/
public class Environment implements IEnvironment
{
//-------- constants --------
/** The default number of lease ticks. */
public static final int DEFAULT_LEASE_TICKS = 50;
//-------- attributes --------
/** The singleton instance. */
protected static Environment instance;
/** The creatures. */
protected Map creatures;
/** The obstacles. */
protected Set obstacles;
/** The prey food. */
protected Set food;
/** All world objects accessible per location. */
public MultiCollection world;
/** The horizontal size. */
protected int sizex;
/** The vertictal size. */
protected int sizey;
/** The monitor. */
protected Object monitor;
/** The list for move and eat requests. */
protected List tasklist;
/** The helper object for bean events. */
protected SimplePropertyChangeSupport pcs;
/** The radnom number generator. */
protected Random rand;
/** The highscore location. */
protected List highscore;
/** The last time the highscore was saved. */
protected long savetime;
/** The interval between saves of highscore (-1 for autosave off). */
protected long saveinterval;
/** The foodrate determines how often new food pops up. */
protected int foodrate;
/** The world age. */
protected int age;
//-------- constructors --------
/**
* Create a new environment.
*/
public Environment()
{
this.creatures = new HashMap();
this.obstacles = new HashSet();
this.food = new HashSet();
this.world = new MultiCollection();
this.monitor = new Object();
this.tasklist = new ArrayList();
this.pcs = new SimplePropertyChangeSupport(this);
this.sizex = 30;
this.sizey = 30;
this.rand = new Random(12345678);
this.saveinterval = 5000;
this.foodrate = 5;
// Hack! only for testing
for(int i=0; i<125; i++)
addObstacle(new Obstacle(getEmptyLocation()));
for(int i=0; i<10; i++)
addFood(new Food(getEmptyLocation()));
// Read highscore list.
InputStream is = null;
try
{
// InputStream tmp = SUtil.getResource("highscore.dmp", Environment.class.getClassLoader());
// ObjectInputStream is = new ObjectInputStream(tmp);
// this.highscore = SUtil.arrayToList(is.readObject());
// is.close();
is = SUtil.getResource("highscore.dmp", Environment.class.getClassLoader());
StringBuffer out = new StringBuffer();
byte[] b = new byte[4096];
for(int n; (n = is.read(b)) != -1;)
{
out.append(new String(b, 0, n));
}
highscore = SUtil.arrayToList(JavaReader.objectFromXML(out.toString(), Environment.class.getClassLoader()));
}
catch(Exception e)
{
// e.printStackTrace();
// System.out.println(e);
highscore = new ArrayList();
}
finally
{
if(is!=null)
{
try
{
is.close();
}
catch(Exception e)
{
}
}
}
}
/**
* Get the singleton.
* @return The environment.
*/
public static Environment getInstance()
{
if(instance==null)
instance = new Environment();
return instance;
}
//-------- interface methods --------
/**
* Move one field upwards. The method will block
* until the current simulation step has finished.
* @return True, when the operation succeeded.
*/
public boolean moveUp(Creature me)
{
return move(me, RequestMove.DIRECTION_UP);
}
/**
* Move one field downwards. The method will block
* until the current simulation step has finished.
* @return True, when the operation succeeded.
*/
public boolean moveDown(Creature me)
{
return move(me, RequestMove.DIRECTION_DOWN);
}
/**
* Move one field to the left. The method will block
* until the current simulation step has finished.
* @return True, when the operation succeeded.
*/
public boolean moveLeft(Creature me)
{
return move(me, RequestMove.DIRECTION_LEFT);
}
/**
* Move one field to the right. The method will block
* until the current simulation step has finished.
* @return True, when the operation succeeded.
*/
public boolean moveRight(Creature me)
{
return move(me, RequestMove.DIRECTION_RIGHT);
}
/**
* Eat some object. The object has to be at the same location.
* This method does not block, and can be called multiple
* times during each simulation step.
* @param food The object.
* @return True, when the operation succeeded.
*/
public boolean eat(Creature me, WorldObject food)
{
boolean ret = false;
int points = 0;
me = getCreature(me);
me.setLeaseticks(DEFAULT_LEASE_TICKS);
if(food instanceof Food)
{
if(me.getLocation().equals(food.getLocation()))
{
ret = removeFood((Food)food);
points = 1;
}
}
else if(me instanceof Hunter && food instanceof Prey)
{
// Get actual creature from world model.
Creature creat = getCreature((Creature)food);
if(me.getLocation().equals(creat.getLocation()))
{
ret = removeCreature(creat);
points = 5;
}
}
if(ret)
{
me.setPoints(me.getPoints()+points);
}
{
// This happens if the creature compute the next step on the old vision.
// The "move" plan resumes execution on "notasks" condition trigger. The creature
// agent will be informed and the next step is computed. The current vision is updated
// via the SimTickerPlan AFTER the condition has triggered. In single core machines this
// seems to happen not very often. But in multicore machines this is a very bad race condition
// that happens very very very very often.
// System.out.println("Creature tried to cheat: '"+me.getName()+"' Do we have a multicore problem?");
}
//block(); todo: make blocking for local case
return ret;
}
/**
* Add a move or eat action to the queue.
*/
public TaskInfo addEatTask(Creature me, WorldObject obj)
{
TaskInfo ret = new TaskInfo(new Object[]{"eat", me, obj});
tasklist.add(ret);
this.pcs.firePropertyChange("taskSize", tasklist.size()-1, tasklist.size());
return ret;
}
/**
* Add a move or eat action to the queue.
*/
public TaskInfo addMoveTask(Creature me, String dir)
{
TaskInfo ret = new TaskInfo(new Object[]{"move", me, dir});
tasklist.add(ret);
this.pcs.firePropertyChange("taskSize", tasklist.size()-1, tasklist.size());
return ret;
}
/**
* Clear the TaskList
* HACK! Should be done in executeStep method, but that leads to problems with
* other Agents. They compute their next step with the old vision. :-(
* This is a race condition too! Tasks can be lost.
*/
protected void clearTaskList()
{
int length = tasklist.size();
tasklist.clear();
this.pcs.firePropertyChange("taskSize", length, tasklist.size());
}
/**
* Get the current vision (without updating the creatures leaseticks).
* @param me The creature.
*/
public Vision internalGetVision(Creature me)
{
Vision ret = new Vision();
me = getCreature(me);
WorldObject[] wos;
if(me instanceof Observer)
{
wos = getAllObjects();
}
else
{
wos = getNearObjects(me.getLocation(), me.getVisionRange());
}
ret.setObjects(wos);
return ret;
}
/**
* Get the current vision. This method does not block,
* and can be called multiple times during each simulation step.
* @param me The creature.
*/
public Vision getVision(Creature me)
{
me = getCreature(me);
me.setLeaseticks(DEFAULT_LEASE_TICKS);
return internalGetVision(me);
}
/**
* Get the width of the world.
*/
public int getWidth()
{
return sizex;
}
/**
* Get the height of the world.
*/
public int getHeight()
{
return sizey;
}
//-------- management methods --------
/**
* Add a new prey food to the world.
* @param nfood The new food.
*/
public void addFood(Food nfood)
{
this.food.add(nfood);
this.world.put(nfood.getLocation(), nfood);
}
/**
* remove a prey food to the world.
* @param nfood Thefood.
*/
public boolean removeFood(Food nfood)
{
this.world.remove(nfood.getLocation(), nfood);
return this.food.remove(nfood);
}
/**
* Add a new obstacle to the world.
* @param obstacle The new obstacle.
*/
public void addObstacle(Obstacle obstacle)
{
this.obstacles.add(obstacle);
this.world.put(obstacle.getLocation(), obstacle);
}
/**
* Remove a obstacle to the world.
* @param obstacle The obstacle.
*/
public boolean removeObstacle(Obstacle obstacle)
{
this.world.remove(obstacle.getLocation(), obstacle);
return this.obstacles.remove(obstacle);
}
/**
* Add a new creature to the world.
* @param creature The creature.
*/
public Creature addCreature(Creature creature)
{
Creature copy;
if(!creatures.containsKey(creature))
{
copy = (Creature)creature.clone();
copy.setLeaseticks(DEFAULT_LEASE_TICKS);
copy.setWorldWidth(getWidth());
copy.setWorldHeight(getHeight());
this.creatures.put(copy, copy);
if(!(copy instanceof Observer))
{
copy.setAge(0);
copy.setPoints(0);
copy.setLocation(getEmptyLocation());
// if(copy instanceof Hunter)
// copy.setVisionRange(5);
// else
copy.setVisionRange(3);
this.world.put(copy.getLocation(), copy);
this.highscore.add(copy);
}
//System.out.println("Environment, creature added: "+copy.getName()+" "+copy.getLocation());
}
else
{
throw new RuntimeException("Creature already exists: "+creature);
}
return copy;
}
/**
* Remove a creature to the world.
* @param creature The creature.
*/
public boolean removeCreature(Creature creature)
{
// Remove tasks of this creature.
int tasks = tasklist.size();
for(Iterator it=tasklist.iterator(); it.hasNext(); )
{
TaskInfo task = (TaskInfo) it.next();
Object[] params = (Object[])task.getAction();
if(creature.equals(params[1]))
{
// System.out.println("Removed: "+task);
it.remove();
}
}
this.pcs.firePropertyChange("taskSize", tasks, tasklist.size());
if(this.world.containsKey(creature.getLocation()))
this.world.remove(creature.getLocation(), creature);
return this.creatures.remove(creature)!=null;
}
/**
* Execute a step.
*/
public void executeStep()
{
// Creatures that already acted in this step.
Set acted = new HashSet();
Creature[] creatures = getCreatures();
for(int i=0; i=0 && savetime+saveinterval<=time)
{
saveHighscore();
savetime = time;
}
age++;
}
/**
* Get the world age.
* @return The age of the world.
*/
public int getWorldAge()
{
return age;
}
/**
* Get the foodrate.
* @return The foodrate.
*/
public int getFoodrate()
{
return foodrate;
}
/**
* Set the foodrate.
* @param foodrate The foodrate.
*/
public void setFoodrate(int foodrate)
{
this.foodrate = foodrate;
}
/**
* Perform a move.
* @param me The creature.
* @param dir The direction.
*/
public boolean move(Creature me, String dir)
{
boolean ret = true;
me = getCreature(me);
me.setLeaseticks(DEFAULT_LEASE_TICKS);
Location newloc = createLocation(me.getLocation(), dir);
Collection col = world.getCollection(newloc);
if(col!=null && col.size()==1 && col.iterator().next() instanceof Obstacle)
{
ret = false;
}
else
{
// Move creature.
try
{
world.remove(me.getLocation(), me);
me.setLocation(newloc);
world.put(me.getLocation(), me);
}
catch(Exception e)
{
//System.out.println("!!! "+me);
System.out.println(world+" "+me);
e.printStackTrace();
}
}
//block(); todo: make blocking for local case
return ret;
}
/**
* Get the creatures.
* @return The creatures.
*/
public Creature[] getCreatures()
{
return (Creature[])creatures.values().toArray(new Creature[creatures.size()]);
}
/**
* Get the obstacles.
* @return The obstacles.
*/
public Obstacle[] getObstacles()
{
return (Obstacle[])obstacles.toArray(new Obstacle[obstacles.size()]);
}
/**
* Get the obstacles.
* @return The obstacles.
*/
public Food[] getFood()
{
return (Food[])food.toArray(new Food[food.size()]);
}
/**
* Get all objects in the world (obstacles, food, and creature).
*/
public WorldObject[] getAllObjects()
{
// Add obstacles and food to return set.
ArrayList ret = new ArrayList();
ret.addAll(obstacles);
ret.addAll(food);
// Add creatures.
ret.addAll(creatures.values());
// Convert to array and return.
return (WorldObject[])ret.toArray(new WorldObject[ret.size()]);
}
/**
* Create a location.
* @param loc The location.
* @param dir The direction.
* @return The new location.
*/
protected Location createLocation(Location loc, String dir)
{
int x = loc.getX();
int y = loc.getY();
if(RequestMove.DIRECTION_UP.equals(dir))
{
y = (sizey+y-1)%sizey;
}
else if(RequestMove.DIRECTION_DOWN.equals(dir))
{
y = (y+1)%sizey;
}
else if(RequestMove.DIRECTION_LEFT.equals(dir))
{
x = (sizex+x-1)%sizex;
}
else if(RequestMove.DIRECTION_RIGHT.equals(dir))
{
x = (x+1)%sizex;
}
return new Location(x, y);
}
/**
* Get an empty location.
* @return The location.
*/
protected Location getEmptyLocation()
{
Location ret = null;
while(ret==null)
{
ret = new Location(rand.nextInt(sizex), rand.nextInt(sizey));
if(world.containsKey(ret))
{
ret = null;
}
}
return ret;
}
/**
* Return the size of the task list.
* @return The task size.
*/
public int getTaskSize()
{
return tasklist.size();
}
/**
* Get the internal representation of a creature.
* If the creature is unknown it gets added to the environment.
* @param creature The creature.
* @return The creature as known in the environment.
*/
protected Creature getCreature(Creature creature)
{
Creature ret = (Creature)creatures.get(creature);
if(ret==null)
{
ret = addCreature(creature);
}
return ret;
}
/**
* Get objects near a position.
* @param loc The location.
* @param range The range.
*/
protected WorldObject[] getNearObjects(Location loc, int range)
{
Collection ret = new ArrayList();
int x = loc.getX();
int y = loc.getY();
for(int i=x-range; i<=x+range; i++)
{
for(int j=y-range; j<=y+range; j++)
{
Collection tmp = world.getCollection(new Location((i+sizex)%sizex, (j+sizey)%sizey));
if(tmp!=null)
ret.addAll(tmp);
}
}
return (WorldObject[])ret.toArray(new WorldObject[ret.size()]);
}
/**
* Get the current highscore.
* @return The 10 best creatures.
*/
public Creature[] getHighscore()
{
try {
Collections.sort(highscore, new Comparator()
{
public int compare(Object o1, Object o2)
{
return ((Creature)o2).getPoints()
- ((Creature)o1).getPoints();
}
});
List copy = highscore.subList(0, Math.min(highscore.size(), 10));
return (Creature[])copy.toArray(new Creature[copy.size()]);
}
catch (ClassCastException cce)
{
return new Creature[0];
}
}
/**
* Save the highscore to a file.
*/
public void saveHighscore()
{
OutputStreamWriter os = null;
try
{
String outputFile = "highscore.dmp";
// write as serialized object
//ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(outputFile));
//os.writeObject(getHighscore());
//os.close();
// write as xml file
os = new OutputStreamWriter(new FileOutputStream(outputFile), "UTF-8");
os.write(JavaWriter.objectToXML(getHighscore(),this.getClass().getClassLoader()));
os.close();
// System.out.println("Saved highscore.");
}
catch(Exception e)
{
System.out.println("Error writing hunterprey highscore 'highscore.dmp'.");
e.printStackTrace();
}
finally
{
if(os!=null)
{
try
{
os.close();
}
catch(Exception e)
{
}
}
}
}
/**
* Set the highscore save interval (-1 for autosave off).
*/
public void setSaveInterval(long saveinterval)
{
this.saveinterval = saveinterval;
}
/**
* Get the highscore save interval (-1 for autosave off).
*/
public long getSaveInterval()
{
return this.saveinterval;
}
//-------- property methods --------
/**
* Add a PropertyChangeListener to the listener list.
* The listener is registered for all properties.
* @param listener The PropertyChangeListener to be added.
*/
public void addPropertyChangeListener(PropertyChangeListener listener)
{
pcs.addPropertyChangeListener(listener);
}
/**
* Remove a PropertyChangeListener from the listener list.
* This removes a PropertyChangeListener that was registered
* for all properties.
* @param listener The PropertyChangeListener to be removed.
*/
public void removePropertyChangeListener(PropertyChangeListener listener)
{
pcs.removePropertyChangeListener(listener);
}
}
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