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external Thread {};
class Philosopher {
isA Thread;
Fork leftFork;
Fork rightFork;
String fname;
boolean isLeftHanded;
ForksInHand {
NoForks {
LookingForForks {
void eat(){
if (isLeftHanded) {
if (leftFork.take()) {
System.out.println(fname + " picked up first fork (left)");
LeftForkAcquired();
}
}
else if (rightFork.take()) {
System.out.println(fname + " picked up first fork (right)");
RightForkAcquired();
}
}
AteFood -> Idling;
}
Idling {
BellyGrumble -> LookingForForks;
}
LeftForkAcquired -> ForkInLeft;
RightForkAcquired -> ForkInRight;
}
ForkInLeft {
void eat() {
if (rightFork.take()) {
System.out.println(fname + " picked up second fork (right)");
RightForkAcquired();
}
}
RightForkAcquired -> ForkInBoth;
}
ForkInRight {
void eat() {
if (leftFork.take()) {
System.out.println(fname + " picked up second fork (left)");
LeftForkAcquired();
}
}
LeftForkAcquired -> ForkInBoth;
}
ForkInBoth {
void eat() {
System.out.println(fname + " is eating.");
try {
sleep(1000);
} catch (InterruptedException ex) { }
AteFood();
leftFork.putDown();
rightFork.putDown();
}
AteFood -> NoForks;
}
}
Belly {
IsHungry {
boolean isHungry() {
return true;
}
AteFood -> IsFull;
}
IsFull {
void think() {
System.out.println(fname + " is full. Now thinking...");
try {
sleep(1000);
} catch (InterruptedException ex) { }
BellyGrumble();
}
BellyGrumble -> IsHungry;
}
}
public void run() {
while (true) {
if (isHungry()) {
eat();
} else {
think();
}
}
}
}
class Fork {
depend java.util.concurrent.*;
Semaphore fork = new Semaphore(1);
boolean take() {
try {
Thread.sleep(100);
} catch (InterruptedException ex) { }
return fork.tryAcquire();
}
void putDown() {
fork.release();
}
}
class Main {
public static void main(String[] args){
String[] names = {"Plato", "Aristotle", "Cicero", "Confucius", "Eratosthenes"};
int k = names.length;
Philosopher[] philosophers = new Philosopher[k];
Fork[] forks = new Fork[k];
for (int i = 0; i < k; ++i) {
forks[i] = new Fork();
}
for (int i = 0; i< k; ++ i) {
Fork leftFork = forks[i];
Fork rightFork = forks[(i + 1) % forks.length];
philosophers[i] = new Philosopher(leftFork, rightFork, names[i], i == k - 1);
philosophers[i].start();
}
}
}
// @@@skipphpcompile - See #1351. State-dependent methods are exclusive to Java generation.
// @@@skipcppcompile
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