Code Samples

Jactor Code Samples
● Slides: http://sourceforge.net/projects/jactor/files/Code%20Samples%2012-JUN-2012.pdf/download
● Code:
https://github.com/anirbanbhattacharjee/jactor-in-action

JActor
● Getting Started
● Basic Code Samples
● State Machines

Getting Started
● The JActor jar file
● Create a test environment

The JActor jar file
● Download Jactor-3.1.0.zip from
https://sourceforge.net/projects/jactor/files/
● Extract jactor-3.1.0.jar from the zip file and copy
it to a new directory, GettingStarted.
● (The JActor version will change—current
version is 3.1.0.)

Create a Test Environment
● Create a j.bat file in the GettingStarted
directory:
del *.class
call javac -classpath jactor-3.1.0.jar *.java
call java -classpath .;jactor-3.1.0.jar GettingStarted

● The j.bat file can be used to run a test.

Basic Code Samples
● Hello world!
● Actor <==> Actor
● RP Games
● Parallel Programming
● Dependency Injection
● Exception Handling
● Loops

Hello world!
● GettingStarted.java (main)
● Test.java (actor)
● Start.java (request)

GettingStarted.java
(main)
import org.agilewiki.jactor.*;

public class GettingStarted {
public static void main(String[] args) throws Exception {
MailboxFactory mailboxFactory =
JAMailboxFactory.newMailboxFactory(10);
Mailbox mailbox = mailboxFactory.createMailbox();
JAFuture future = new JAFuture();
Test test = new Test();
test.initialize(mailbox);
Start.req.send(future, test);
mailboxFactory.close();
}
}

Test.java
(actor)
import org.agilewiki.jactor.lpc.*;

public class Test extends JLPCActor {
public void start(RP rp) throws Exception {
System.out.println("Hello world!");
rp.processResponse(null);
}
}

Start.java
(request)

public class Start extends Request<Object, Test> {

public static final Start req = new Start();

public void processRequest(JLPCActor targetActor, RP rp)
throws Exception {
Test a = (Test) targetActor;
a.start(rp);
}

public boolean isTargetType(Actor targetActor) {
return targetActor instanceof Test;
}
}

Output
Hello world!
GettingStarted>

Actor <==> Actor
● Greeter.java (actor)
● Greet.java (request)

Test.java
(actor)

public void start(final RP rp) throws Exception {
Greeter greeter = new Greeter();
greeter.initialize(getMailbox());
Greet.req.send(this, greeter, new RP<String>() {
public void processResponse(String greeting)
throws Exception {
System.out.println(greeting);
}
});
}
}

Greeter.java
(actor)

public class Greeter extends JLPCActor {
public void greet(RP rp) throws Exception {
rp.processResponse("Hello world!");
}
}

Greet.java
(request)

public class Greet extends Request<String, Greeter> {

public static final Greet req = new Greet();

throws Exception {
Greeter a = (Greeter) targetActor;
a.greet(rp);
}

return targetActor instanceof Greeter;
}
}

RP Games
● Trigger.java (request)

Test.java
(actor)

Greeter greeter = new Greeter();
greeter.initialize(getMailbox());
Greet.req.send(this, greeter, new RP<String>() {
public void processResponse(String greeting)
throws Exception {
System.out.println(greeting);
}
});
System.out.println("trigger...");
Trigger.req.sendEvent(this, greeter);
}
}

Greeter.java
(actor)

private RP rp;

this.rp = rp;
}

public void trigger(RP rp) throws Exception {
this.rp.processResponse("Hello world!");
}
}

Trigger.java
(request)

public class Trigger extends Request<Object, Greeter> {

public static final Trigger req = new Trigger();

throws Exception {
Greeter a = (Greeter) targetActor;
a.trigger(rp);
}

return targetActor instanceof Greeter;
}
}

Output
Trigger...
Hello world!
GettingStarted>

Parallel Programming
● Timer.java (actor)
● Delay.java (request)

Test.java
(actor)
Timer timer1 = new Timer();
timer1.initialize(
getMailboxFactory().createAsynchronousMailbox());
Timer timer2 = new Timer();
timer2.initialize(
getMailboxFactory().createAsynchronousMailbox());
final long t0 = System.currentTimeMillis();
RP prp = new RP() {
boolean pending = true;
public void processResponse(Object obj) throws Exception {
if (pending) pending = false;
else {
System.out.println(System.currentTimeMillis()-t0);
}
}
};
(new Delay(1000)).send(this, timer1, prp);
(new Delay(1000)).send(this, timer2, prp);
}
}

Timer.java
(actor)

public class Timer extends JLPCActor {
public void delay(int ms, RP rp) throws Exception {
Thread.sleep(ms);
}
}

Delay.java
(request)
public class Delay extends Request<Object, Timer> {

public final int ms;

public Delay(int ms) {
this.ms = ms;
}

throws Exception {
Timer a = (Timer) targetActor;
a.delay(ms, rp);
}

return targetActor instanceof Timer;
}
}

Dependency Injection
● Printer.java(actor)
● Print.java (request)

Test.java
(actor)

Printer printer = new Printer();
printer.initialize(getMailbox());
final Greeter greeter = new Greeter();
greeter.initialize(getMailbox(), printer);
(new Print("Greeting:")).
send(this, greeter, new RP() {
public void processResponse(Object rsp)
throws Exception {
Greet.req.send(Test.this, greeter, rp);
}
});
}
}

Greeter.java
(actor)

(new Print("Hello world!")).send(this, this, rp);
}
}

Printer.java
(actor)

public class Printer extends JLPCActor {
public void print(String value, RP rp) throws Exception {
System.out.println(value);
}
}

Print.java
(request)

public class Print extends Request<Object, Printer> {
public final String value;

public Print(String value) {
this.value = value;
}

throws Exception {
Printer a = (Printer) targetActor;
a.processRequest(value, rp);
}

return targetActor instanceof Printer;
}
}

Output
Greeting:
Hello world!
GettingStarted>

Exception Handling
● ThrowsException.java (actor)
● ThrowException.java (request)

Test.java
(actor)

ThrowsException throwsException = new ThrowsException();
throwsException.initialize(getMailbox());
setExceptionHandler(new ExceptionHandler() {
public void process(Exception exception)
throws Exception {
System.out.println(exception.getMessage());
}
});
ThrowException.req.send(this, throwsException, new RP() {
public void processResponse(Object response)
throws Exception {
System.out.println("No exception");
}
});
}
}

ThrowsException
(actor)

public class ThrowsException extends JLPCActor {
public void throwException(RP rp) throws Exception {
throw new Exception("Boo!");
}
}

ThrowException
(request)

public class ThrowException
extends Request<Object, ThrowsException> {

public static final ThrowException req =
new ThrowException();

throws Exception {
ThrowsException a = (ThrowsException) targetActor;
a.throwException(rp);
}

return targetActor instanceof ThrowsException;
}
}

Test.java
(actor)
final int max = 5;
(new JAIterator() {
int i = 0;

protected void process(RP irp) throws Exception {
if (i == max) irp.processResponse("done");
else {
i += 1;
(new Print(""+i)).
send(Test.this, printer, irp);
}
}
}).iterate(rp);
}
}

Output
1
2
3
4
5
GettingStarted>

State Machines
● A Sequence of Requests
● Looping

A Sequence of Requests

Test.java
(actor)

SMBuilder smb = new SMBuilder();
smb._send(printer, new Print("a"));
smb._send(printer, new Print("b"));
smb._send(printer, new Print("c"));
smb.call(rp);
}
}

Looping

Test.java
(actor)
import org.agilewiki.jactor.stateMachine.*;

int counter;

SMBuilder smb = new SMBuilder();
counter = 1;
smb._label("loop");
smb._send(printer, new ObjectFunc() {
public Object get(StateMachine sm) {
return new Print(""+counter);
}
});
smb._if(new BooleanFunc() {
public boolean get(StateMachine sm) {
counter += 1;
return counter < 6;
}
}, "loop");
smb.call(rp);
}
}

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