/*
* Copyright (c) 2005-2010 KOM – Multimedia Communications Lab
*
* This file is part of PeerfactSim.KOM.
*
* PeerfactSim.KOM 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 3 of the License, or
* any later version.
*
* PeerfactSim.KOM 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 PeerfactSim.KOM. If not, see .
*
*/
package de.tud.kom.p2psim.impl.topology.movement.modularosm.transition;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import de.tud.kom.p2psim.api.scenario.ConfigurationException;
import de.tud.kom.p2psim.api.topology.movement.SimLocationActuator;
import de.tudarmstadt.maki.simonstrator.api.Event;
import de.tudarmstadt.maki.simonstrator.api.EventHandler;
import de.tudarmstadt.maki.simonstrator.api.Randoms;
import de.tudarmstadt.maki.simonstrator.api.component.sensor.location.AttractionPoint;
/**
* A simplified transition strategy taking only the weights of an AP into account.
*
* @author Bjoern Richerzhagen
* @version 1.0, Jan 16, 2017
*/
public class WeightedTransitionStrategy implements ITransitionStrategy, EventHandler {
private Set aps = new LinkedHashSet<>();
private Map assignments = new LinkedHashMap<>();
private Map lastAssignments = new LinkedHashMap<>();
private List listeners = new LinkedList<>();
private long pauseTimeMin = 0;
private long pauseTimeMax = 0;
private Random rnd = Randoms.getRandom(WeightedTransitionStrategy.class);
private final static int EVENT_PAUSE_ENDED = 1;
@Override
public AttractionPoint getAssignment(SimLocationActuator comp) {
return assignments.get(comp);
}
@Override
public void addAttractionAssignmentListener(
AttractionAssignmentListener listener) {
listeners.add(listener);
}
@Override
public void removeAttractionAssignmentListener(
AttractionAssignmentListener listener) {
listeners.remove(listener);
}
@Override
public void setAttractionPoints(
Collection attractionPoints) {
this.aps.addAll(attractionPoints);
}
@Override
public Set getAllAttractionPoints() {
return Collections.unmodifiableSet(aps);
}
@Override
public void addComponent(SimLocationActuator ms) {
this.assignments.put(ms, getNewAssignment(ms));
}
private AttractionPoint getNewAssignment(SimLocationActuator component) {
double score = rnd.nextDouble();
List candidates = new LinkedList<>();
for (AttractionPoint ap : aps) {
if (ap.getWeight() >= score) {
candidates.add(ap);
}
}
if (candidates.isEmpty()) {
candidates.addAll(aps);
}
AttractionPoint assignment = candidates.get(rnd.nextInt(candidates.size()));
listeners.forEach(listener -> listener.updatedAttractionAssignment(component, assignment));
return assignment;
}
private long getPauseTime(SimLocationActuator component) {
return (long) (rnd.nextDouble() * (pauseTimeMax-pauseTimeMin)) + pauseTimeMin;
}
@Override
public void eventOccurred(Object content, int type) {
assert type == EVENT_PAUSE_ENDED;
SimLocationActuator comp = (SimLocationActuator) content;
if (!this.assignments.containsKey(comp)) {
// maybe someone assigned a new AP in the meantime. ignore.
this.assignments.put(comp, getNewAssignment(comp));
}
}
@Override
public void reachedAttractionPoint(SimLocationActuator ms) {
// JZ: Added this to prevent multiple calls while pausing
if (!this.assignments.containsKey(ms)) {
return;
}
this.lastAssignments.put(ms, this.assignments.remove(ms));
Event.scheduleWithDelay(getPauseTime(ms), this, ms, EVENT_PAUSE_ENDED);
}
@Override
public void updateTargetAttractionPoint(SimLocationActuator comp,
AttractionPoint attractionPoint) {
this.lastAssignments.put(comp, this.assignments.remove(comp));
this.assignments.put(comp, attractionPoint);
listeners.forEach(listener -> listener.updatedAttractionAssignment(comp, attractionPoint));
}
public void setMinPauseTime(long minPauseTime) {
if (minPauseTime < 0) {
throw new ConfigurationException(
"MinPauseTime should be >= 0!");
}
this.pauseTimeMin = minPauseTime;
}
public void setMaxPauseTime(long maxPauseTime) {
if (maxPauseTime < 0) {
throw new ConfigurationException(
"MaxPauseTime should be >= 0!");
}
this.pauseTimeMax = maxPauseTime;
}
}