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Master.java
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Master.java
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package cs412.dinghyprop;
import cs412.dinghyprop.genetics.GeneticProgram;
import cs412.dinghyprop.genetics.IPopulationObserver;
import cs412.dinghyprop.genetics.Program;
import cs412.dinghyprop.simulator.ISimulator;
import java.net.MalformedURLException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.logging.Logger;
/**
* GP master server
*/
public class Master extends UnicastRemoteObject implements IMaster, IPopulationObserver, Runnable {
private static final long serialVersionUID = 7213091562277551698L;
private static Logger log = Logger.getLogger("Master");
private static final int POPULATION_SIZE = 10000;
private static final int GENERATIONS = 100000;
/**
* The GP for this run
*/
private transient GeneticProgram geneticProgram;
/**
* The simulation environments of the GP run
*/
private ISimulator[] simulators;
/**
* The list of registered {@code IClient}s
*/
private final transient Queue<IClient> clients = new ConcurrentLinkedQueue<IClient>();
/**
* Programs that are pending evaluation
*/
private final transient Queue<IndexedProgram> pendingPrograms =
new ConcurrentLinkedQueue<IndexedProgram>();
/**
* The number of programs that still require evaluation (GP's generation
* size less the evaluated program count)
*/
private int programsRemaining;
/**
* The number of generations to run
*/
private int generations;
/**
* The RMI address on which to listen
*/
private static final String address = "Master";
/*
* Status for program dispatcher.
*/
private boolean running = true;
/*
* Statistics
*/
int best;
int worst;
Program leader = null;
/**
* Create a new master object.
* @param simulators The simulation environments to supply to clients
* @throws RemoteException
*/
public Master(GeneticProgram geneticProgram, ISimulator[] simulators, int generations)
throws RemoteException {
super(54614);
this.geneticProgram = geneticProgram;
this.simulators = simulators;
this.generations = generations;
programsRemaining = geneticProgram.getPopulationSize();
resetStatistics();
}
/**
* Register with RMI and run the GP.
* @throws MalformedURLException
* @throws RemoteException
*/
public synchronized void runGP() throws MalformedURLException, RemoteException {
geneticProgram.addPopulationObserver(this);
Registry registry = LocateRegistry.getRegistry();
registry.rebind(address, this);
geneticProgram.initialize();
leader = geneticProgram.getProgram(0); // A safe default
new Thread(this).start();
int targetFitness = 300 * simulators.length;
for (int i = 1; i <= generations; i++) {
while (programsRemaining > 0)
try { wait(); } catch (InterruptedException ignored) { }
if (best >= targetFitness) {
log.info("Successful individual found.");
break;
}
log.info("Creating generation #" + Integer.toString(i));
programsRemaining = geneticProgram.getPopulationSize();
resetStatistics();
geneticProgram.createNextGeneration();
}
log.info("GP run complete.");
log.info("Releasing clients.");
for (IClient client : clients)
client.release();
clients.clear();
running = false;
}
/**
* Evaluate all the individuals in a population.
*/
@Override
public void run() {
while (running) {
synchronized (this) {
while (pendingPrograms.isEmpty())
try { wait(); } catch (InterruptedException ignored) { }
}
IndexedProgram entry = getNextProgram();
sendForEvaluation(entry.index, entry.program);
}
}
/**
* Create a thread to handle I/O with a client and evaluate a program.
* @param index The program's index
* @param program The program itself
*/
private void sendForEvaluation(final int index, final Program program) {
final IClient client = getNextClient();
Thread t = new Thread(new Runnable() {
@Override
public void run() {
try {
int fitness = client.evaluateProgram(program.program);
enqueueClient(client);
updateFitness(index, fitness);
} catch (RemoteException ignored) {
enqueueProgram(index, program);
}
}
});
t.start();
}
/**
* "Callback" for evaluation threads that manages fitness update
* bookkeeping.
* @param index The index of the program to update
* @param fitness The fitness to assign the program
*/
private synchronized void updateFitness(int index, int fitness) {
geneticProgram.setProgramFitness(index, fitness);
programsRemaining--;
updateStatistic(index, fitness);
notifyAll();
}
@Override
public ISimulator[] getEvaluationSimulators() throws RemoteException {
return simulators;
}
@Override
public Program getCurrentLeader() throws RemoteException {
return leader;
}
@Override
public void registerClient(IClient client) throws RemoteException {
enqueueClient(client);
}
/**
* Enqueue a client for processing, handling notification.
* @param client The {@code IClient} to enqueue
*/
private synchronized void enqueueClient(IClient client) {
clients.add(client);
notifyAll();
}
/**
* Obtain the next available {@code IClient}.
* @return The {@code IClient} that has been waiting the longest
*/
private synchronized IClient getNextClient() {
while (clients.isEmpty()) {
try {
wait();
} catch (InterruptedException ignored) { }
}
return clients.poll();
}
@Override
public void individualCreated(int index, Program individual) {
enqueueProgram(index, individual);
}
/**
* Enqueue a program, handling notification.
* @param index The index of the program
* @param individual The program itself
*/
private synchronized void enqueueProgram(int index, Program individual) {
pendingPrograms.add(new IndexedProgram(index, individual));
notifyAll();
}
/**
* Obtain the next program due for processing.
* @return A {@code Map.Entry<Integer,Program>} where the key is the
* index and the value is the {@code Program} to be processed
*/
private synchronized IndexedProgram getNextProgram() {
while (pendingPrograms.isEmpty()) {
try {
wait();
} catch (InterruptedException ignored) { }
}
return pendingPrograms.poll();
}
/**
* Update the statistics fields with new fitness information.
* @param index The index of the program the fitness refers to
* @param fitness The latest returned fitness
*/
private void updateStatistic(int index, int fitness) {
if (fitness < worst)
worst = fitness;
if (fitness > best) {
best = fitness;
leader = geneticProgram.getProgram(index);
}
}
/**
* Reset the statistics fields.
*/
private void resetStatistics() {
worst = Integer.MAX_VALUE;
best = Integer.MIN_VALUE;
}
@Override
public String toString() {
return "Master @ " + address;
}
/**
* Register a new {@code Master} with RMI.
* @param args One argument: the directory name where simulator files
* are stored
* @throws Exception
*/
public static void main(String[] args) throws Exception {
if (args.length != 1) {
System.err.println("Usage: Master <simulation_directory>");
System.exit(-1);
}
SimulationDirLoader sdl = new SimulationDirLoader(args[0]);
ISimulator[] simulators = sdl.load();
GeneticProgram gp = new GeneticProgram(POPULATION_SIZE,
GeneticProgram.INIT_POP_METHOD.RHALF_AND_HALF, 3);
new Master(gp, simulators, GENERATIONS).runGP();
}
/**
* Manages a program and its index.
*/
class IndexedProgram {
public int index;
public Program program;
/**
* Create a new {@code IndexedProgram}.
* @param index The program's index
* @param program The program itself
*/
public IndexedProgram(int index, Program program) {
this.index = index;
this.program = program;
}
@Override
public String toString() {
return "IndexedProgram{index=" + index + ", program=" + program + '}';
}
}
}