pull/2/head
obaya 2025-05-02 20:12:09 +02:00
parent 4babf0c797
commit 3cee7198b9
1 changed files with 61 additions and 2 deletions

View File

@ -1,20 +1,76 @@
package pp; package pp;
import java.util.Random;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.Lock;
public class Philosopher extends Thread implements IPhilosopher { public class Philosopher extends Thread implements IPhilosopher {
private int seat; private int seat;
private Philosopher rechts;
private Philosopher links;
private Lock table;
private Condition condition ;
private volatile boolean stopped;
private volatile boolean eating;
private final Random random;
public Philosopher() {
this.random = new Random();
this.seat = 0;
this.stopped = false;
}
@Override
public void run() {
try {
while (this.stopped == false) {
think();
eat();
}
} catch (InterruptedException e) {
// Thread was interrupted, exit gracefully
}
}
private void eat() throws InterruptedException {
table.lock();
try {
while(this.links.eating || this.rechts.eating)
this.condition.await();
this.eating = true;
}finally {
table.unlock();
}
Thread.sleep(this.random.nextInt(PhilosopherExperiment.MAX_EATING_DURATION_MS));
}
private void think() {
table.lock();
this.links.condition.signal();
this.rechts.condition.signal();
table.unlock();
try {
Thread.sleep(random.nextInt(PhilosopherExperiment.MAX_THINKING_DURATION_MS));
log(seat, " : denkt gerade !");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override @Override
public void setLeft(IPhilosopher left) { public void setLeft(IPhilosopher left) {
// TODO Auto-generated method stub // TODO Auto-generated method stub
// Cast auf Philosopher erforderlich // Cast auf Philosopher erforderlich
this.links = (Philosopher) left;
} }
@Override @Override
public void setRight(IPhilosopher right) { public void setRight(IPhilosopher right) {
// TODO Auto-generated method stub // TODO Auto-generated method stub
// Cast auf Philosopher erforderlich // Cast auf Philosopher erforderlich
this.rechts = (Philosopher) right;
} }
@Override @Override
@ -25,12 +81,15 @@ public class Philosopher extends Thread implements IPhilosopher {
@Override @Override
public void setTable(Lock table) { public void setTable(Lock table) {
// TODO Auto-generated method stub // TODO Auto-generated method stub
this.table = table;
condition = this.table.newCondition();
} }
@Override @Override
public void stopPhilosopher() { public void stopPhilosopher() {
// TODO Auto-generated method stub
this.stopped = true;
interrupt();
} }
} }