/** Queue process --> until it is not empty */
private void processQueue() throws RemoteException, NotBoundException, InterruptedException {
if (this.messageQueue.isEmpty()) {
Thread.sleep(1000);
return;
}
while (!this.messageQueue.isEmpty()) {
Message mess = this.messageQueue.poll();
MessageType type = mess.getType();
// synchronize my logical time
this.setNewClock(mess.getClock());
switch (type) {
case START:
this.log.logNode("Starting work ...", -1, this.nodeInfo.getID());
this.workAmount = new Random().nextInt(SLEEP_TIME_MODULE);
this.log.logNode(
"Generated work amount is " + this.workAmount + ".", clock, this.nodeInfo.getID());
this.workStopAccepted = true;
break;
case GET_WORK: // some work with random time
this.log.logNode(
"Work has been received: " + mess.toString() + ".", clock, this.nodeInfo.getID());
this.workAmount += Integer.parseInt(mess.getPayload());
this.log.logNode(
"New work amount is " + this.workAmount + ".", clock, this.nodeInfo.getID());
break;
case TOKEN:
this.log.logNode(
"Token has been received " + mess.toString(), clock, this.nodeInfo.getID());
processToken(mess);
break;
case STOP:
this.directory.logout(this.nodeInfo);
this.log.logNode("Exiting", clock, this.nodeInfo.getID());
System.exit(0);
break;
case WORK_TERMINATED:
this.log.logNode("Work has been terminated :).", clock, this.nodeInfo.getID());
this.init();
break;
default:
// do nothing by default
break;
}
}
}
/**
* This method sends a message to the process; this process also sets logical clock
*
* @param workMess
* @param address
*/
private void sendMessageToProcess(Message workMess, int address)
throws RemoteException, NotBoundException {
// 1]locate NodeInfo object
NodeInfo[] nodeInfos = this.directory.listNodes();
NodeInfo regNode = null;
// System.out.println("NodeInfoLength = "+nodeInfos.length+"\n"+
// "Processing nodes:");
for (int i = 0; i < nodeInfos.length; i++) {
// System.out.println("-->"+nodeInfos[i].toString()+" "+address);
if (nodeInfos[i].getID() == address) {
regNode = nodeInfos[i];
}
}
// 2]Get remote registry
Registry remoteRegistry = LocateRegistry.getRegistry(regNode.getIP(), regNode.getPort());
// 3]Lookup and put data
String nodeName = NODE_NAME_PREFIX + address;
// set clock
this.clock++; // increment clock
workMess.setClock(clock);
// message prepared
this.log.logNode(
"Sending message to processs " + address + "-->" + workMess.toString(),
clock,
this.nodeInfo.getID());
NodeInterface nodeDirectory = (NodeInterface) remoteRegistry.lookup(nodeName);
nodeDirectory.putMessage(workMess);
}
/**
* Token processing & sending
*
* @param mess - message
*/
private void processToken(Message mess) throws RemoteException, NotBoundException {
Message outMess = new Message();
outMess.setType(MessageType.TOKEN);
this.log.logNode("Received message -> " + mess.toString(), clock, this.nodeInfo.getID());
if (mess.getColor() == Color.BLACK) {
// black token
if (this.nodeInfo.getID() == 0) {
// primary process
this.log.logNode("BLACK node has been received.", clock, 0);
this.startTokenSent = false;
} else {
outMess.setColor(Color.BLACK);
}
} else {
// white token
if (this.nodeInfo.getID() == 0) {
// primary process --> received white node;all stops working
this.log.logNode("Work has been terminated :).", clock, 0);
sendTerminatedMessage();
this.init();
} else {
// i am not the primary process
if (this.myState == NodeState.PASSIVE) {
// I don't have any work
outMess.setColor(myColor);
} else {
// I have work
outMess.setColor(Color.BLACK);
}
}
}
// get node count and send token if node count is bigger than one
if (this.directory.getNodeCount() == 1) return;
// send data
if (this.nodeInfo.getID() != 0) {
int neighbourID = getNeighbourID();
this.sendMessageToProcess(outMess, neighbourID);
}
// reset my color
this.myColor = Color.WHITE;
}
/** Start random computing */
private void startRandomWork() throws RemoteException, NotBoundException {
try {
// check if you have some work
if (workAmount == 0) return;
// simulate working
Thread.sleep(WORK_AMOUNT_UNIT * 1000);
// change variable with consumed work
int oldWork = this.workAmount;
this.workAmount -= WORK_AMOUNT_UNIT;
if (this.workAmount < 0) {
this.workAmount = 0;
}
// log it
this.log.logNode(
"Working : " + oldWork + "->" + this.workAmount + ".", clock, this.nodeInfo.getID());
///////////////////////////////////////////////////////
// if some work has been sent -> end it
boolean sendWork = new Random().nextBoolean();
if (workSent || sendWork) {
// this.log.logNode("Work has been allready sent.", -1, this.nodeInfo.getID());
return;
}
// send work to node with lower id
if (this.directory.getNodeCount() > 1) {
int randInd;
// generate random number
if (this.directory.getNodeCount() == 2) {
randInd = this.getNeighbourID();
} else {
do {
randInd = new Random().nextInt(this.directory.getNodeCount() - 1);
} while (this.nodeInfo.getID() == randInd);
}
this.workSent = true;
// send work
int RandomWork = new Random().nextInt(SLEEP_TIME_MODULE);
Message workMess =
new Message(MessageType.GET_WORK, -1, Color.WHITE, Integer.toString(RandomWork));
sendMessageToProcess(workMess, randInd);
this.log.logNode(
"Work has been sent to " + randInd + "->" + workMess.toString() + ".",
clock,
this.nodeInfo.getID());
// change my color -> if you are sending to the host with lower id
if (this.nodeInfo.getID() > randInd) {
this.myColor = Color.BLACK;
this.log.logNode(
"Receiver ID was smaller than mine -> I become to be BLACK.",
clock,
this.nodeInfo.getID());
}
}
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}