update PU

eigenes/src/Philosopher.java

@@ -0,0 +1,95 @@
+package pp;
+
+import java.util.concurrent.locks.Lock;
+import java.util.Random;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class Philosopher extends Thread implements IPhilosopher {
+	
+	private Philosopher left;
+	private Philosopher right;
+	private int seat;
+	private Lock table;
+	private Condition tableIsFull;
+	private final Random random = new Random();
+
+	
+	private volatile boolean stopped;
+	private volatile boolean eating;
+
+	@Override
+	public void setLeft(IPhilosopher left) {
+		this.left = (Philosopher) left;
+	}
+
+	@Override
+	public void setRight(IPhilosopher right) {
+		this.right = (Philosopher) right;
+	}
+
+	@Override
+	public void setSeat(int seat) {
+		this.seat = seat;
+	}
+
+	@Override
+	public void setTable(Lock table) {
+		this.table = (ReentrantLock) table;
+		tableIsFull = table.newCondition();
+
+	}
+
+	@Override
+	public void stopPhilosopher() {
+		this.stopped = true;
+		interrupt();
+
+	}
+
+	private void eat() {
+		table.lock();
+		try {
+			while(this.left.eating || this.right.eating) {
+				tableIsFull.await();
+			}
+			this.eating = true;
+			Thread.sleep(this.random.nextInt(PhilosopherExperiment.MAX_TAKING_TIME_MS));
+			table.unlock();
+			System.out.println("Philosoper at s: " + seat + " is eating");
+			Thread.sleep(this.random.nextInt(PhilosopherExperiment.MAX_EATING_DURATION_MS));
+			System.out.println("Philosopher at s: " +  seat + " has finished eating.");
+			this.eating = false;
+		} catch (Exception e) {
+			this.stopPhilosopher();
+		} finally {
+			if(this.stopped) {
+				table.unlock();
+			}
+		}
+	}
+	private void think(){
+		table.lock();
+		try {
+			right.tableIsFull.signal();
+			left.tableIsFull.signal();
+			table.unlock();
+			Thread.sleep(this.random.nextInt(PhilosopherExperiment.MAX_THINKING_DURATION_MS));
+		} catch (InterruptedException e) {
+			this.stopPhilosopher();
+		}
+	}
+
+	@Override
+	public void run() {
+		try {
+			while(!this.stopped) {
+				think();
+				eat();
+			}
+		} catch(Exception e) {
+			Thread.currentThread().interrupt();
+		}
+	}
+}
+