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Broker.java
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Broker.java
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package client;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Random;
import java.util.Set;
//import java.util.Timer;
import java.util.TreeSet;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.json.JSONObject;
public class Broker implements MqttCallback {
MqttClient client;
static Hashtable<String, Attributes> statsMap = new Hashtable<String, Attributes>();
static TreeSet<Coo> scoreSet = new TreeSet<Coo>();
static Hashtable<String, Hashtable<String, MqttMessage>> ledger = new Hashtable<String, Hashtable<String, MqttMessage>>();
static double[] average = new double[7];
static double[] sigma = new double[7];
static int n = 0;
static String BrokerIp;
static final Object lock = new Object();
public static synchronized boolean containedStatsMap(String name){
return statsMap.containsKey(name);
}
public static synchronized void putStatsMap(String name, Attributes stats){
statsMap.put(name, stats);
}
public static synchronized void setScoreSet(TreeSet<Coo> tree){
scoreSet.clear();
scoreSet.addAll(tree);
}
public static void setAverage(double[] avg){
for (int i=0; i<7; i++) {
average[i] = avg[i];
}
}
public static void setSigma(double[] sgm){
for (int i=0; i<7; i++) {
sigma[i] = sgm[i];
}
}
public static void setN(int number){
n = number;
}
public static synchronized int getNoTasks(String key) {
if (ledger.contains(key)) {
return ledger.get(key).size();
}
else {
return 0;
}
}
public static synchronized int getTrust(String key) {
Random rand = new Random();
return rand.nextInt(100);
}
public static synchronized Attributes getStats(String key){
return statsMap.get(key);
}
public static synchronized void removeStats(String key) {
statsMap.remove(key);
}
public static synchronized Hashtable<String, Attributes> getStatsMap(){
return statsMap;
}
public static double[] getAverage(){
return average;
}
public static double[] getSigma(){
return sigma;
}
public static int getN(){
return n;
}
public void callForStats() {
MqttMessage msg = new MqttMessage();
msg.setPayload("Call for stats".getBytes());
try {
client.publish("stats/call", msg);
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
BrokerIp = args[0];
new Broker().connect();
}
public void connect() {
try {
client = new MqttClient("tcp://"+BrokerIp+":1883", "broker");
client.connect();
client.setCallback(this);
client.subscribe("toBroker/toExec");
client.subscribe("toBroker/#");
client.subscribe("stats/#");
client.subscribe("orfeas/sagapo");
client.subscribe("orfeas/kaigo");
ScheduledExecutorService updaterExecutor = Executors.newSingleThreadScheduledExecutor();
updaterExecutor.scheduleAtFixedRate(new Updater(this), 0, 10, TimeUnit.SECONDS);
ScheduledExecutorService scorerExecutor = Executors.newSingleThreadScheduledExecutor();
scorerExecutor.scheduleAtFixedRate(new Scorer(), 5, 10, TimeUnit.SECONDS);
//Timer timer = new Timer();
//timer.schedule(new Scorer(), 0, 1000);
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void connectionLost(Throwable cause) {
// TODO Auto-generated method stub
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
System.out.println(message);
if (topic.equals("toBroker/toExec")) {
System.out.println("Received from Gateway");
//If you want to score before choosing host:
/* Thread t2 = new Scorer();
t2.start();
t2.join();
*/
String bestName = scoreSet.first().name;
MqttTopic pubTopic = client.getTopic("fromBroker/" + bestName);
pubTopic.publish(message);
String jsonMsg = new String(message.getPayload(), "US-ASCII");
JSONObject obj = new JSONObject(jsonMsg);
String id = (obj.getJSONObject("id")).toString();
Hashtable<String, MqttMessage> tmpTasks;
if (ledger.get(bestName).isEmpty()) {
tmpTasks = new Hashtable<String, MqttMessage>();
}
else {
tmpTasks = ledger.get(bestName);
}
tmpTasks.put(id, message);
ledger.put(bestName, tmpTasks);
//client.publish("fromBroker/toTask", message);
System.out.println("Forwarding to Host");
}
////topic.contains("toBroker") is an ok condition because it is certainly NOT "toBroker/toExec"
else if (topic.contains("toBroker/taskResults")) {
System.out.println("Received from Host");
MqttTopic pubTopic = client.getTopic("fromBroker/results");
pubTopic.publish(message);
String payload = message.toString();
String[] subl =payload.split("~");
Hashtable<String, MqttMessage> tmpTasks;
tmpTasks = ledger.get(subl[0]);
tmpTasks.remove(subl[1]);
if (tmpTasks.isEmpty()) {
ledger.remove(subl[0]);
}
else {
ledger.put(subl[0], tmpTasks);
}
//client.publish("fromBroker/results", message);
System.out.println("Forwarding to Gateway");
}
else if (topic.contains("stats")) {
System.out.println("Received stats");
//MqttTopic pubTopic = client.getTopic("a/test");
//pubTopic.publish(message);
Thread t1 = new Stater(topic, message);
//t1.setPriority(Thread.NORM_PRIORITY - 1);
t1.start();
System.out.println("Started thread");
t1.join();
if ((message.toString()).startsWith("offline")) {
Thread t2 = new Scorer(); //TI PAIZEI EDO???AAAAAA
t2.start();
t2.join();
String hostName = topic.substring(6);
Hashtable<String, MqttMessage> tmpTasks;
tmpTasks = ledger.get(hostName);
Set<String> keys = tmpTasks.keySet();
Iterator<String> itr = keys.iterator();
String key;
while (itr.hasNext()) {
key = itr.next();
String bestName = scoreSet.first().name;
MqttMessage tmpMsg = new MqttMessage();
tmpMsg = tmpTasks.get(key);
MqttTopic pubTopic = client.getTopic("fromBroker/" + bestName);
pubTopic.publish(tmpMsg);
Hashtable<String, MqttMessage> tmpTasks2;
if (ledger.get(bestName).isEmpty()) {
tmpTasks2 = new Hashtable<String, MqttMessage>();
}
else {
tmpTasks2 = ledger.get(bestName);
}
tmpTasks2.put(key, tmpMsg);
ledger.put(bestName, tmpTasks2);
}
ledger.get(hostName).clear();
ledger.remove(hostName);
//Old way with Timer.
/* Timer timer = new Timer();
timer.schedule(new Scorer(), 0);
synchronized (Broker.lock) {
String hostName = topic.substring(6);
Hashtable<String, MqttMessage> tmpTasks;
tmpTasks = ledger.get(hostName);
Set<String> keys = tmpTasks.keySet();
Iterator<String> itr = keys.iterator();
String key;
while (itr.hasNext()) {
key = itr.next();
String bestName = scoreSet.first().name;
MqttMessage tmpMsg = new MqttMessage();
tmpMsg = tmpTasks.get(key);
MqttTopic pubTopic = client.getTopic("fromBroker/" + bestName);
pubTopic.publish(tmpMsg);
Hashtable<String, MqttMessage> tmpTasks2;
if (ledger.get(bestName).isEmpty()) {
tmpTasks2 = new Hashtable<String, MqttMessage>();
}
else {
tmpTasks2 = ledger.get(bestName);
}
tmpTasks2.put(key, tmpMsg);
ledger.put(bestName, tmpTasks2);
}
ledger.get(hostName).clear();
ledger.remove(hostName);
}*/
}
}
//Debug
if (topic.equals("orfeas/sagapo")) {
System.out.println("statsMap:");
Set<String> keys = statsMap.keySet();
Iterator<String> itr = keys.iterator();
String key;
Attributes stats;
while (itr.hasNext()) {
key = itr.next();
stats = statsMap.get(key);
System.out.println(stats.cpu + " " + stats.ram + " " + stats.zone + stats.direction + " " + stats.latency + " " + stats.battery);
}
System.out.println(n);
System.out.println("average");
for (int i=0; i<7; i++) {
System.out.println(average[i]);
}
System.out.println("sigma");
for (int i=0; i<7; i++) {
System.out.println(sigma[i]);
}
}
if (topic.equals("orfeas/kaigo")) {
System.out.println("scoreSet");
for (Coo i : scoreSet) {
System.out.println(i.name + "------" + i.rank);
}
}
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
// TODO Auto-generated method stub
}
}