ElevatorTest.java

// PART OF THE MACHINE SIMULATION. DO NOT CHANGE.

package nachos.machine;

import nachos.security.*;
import nachos.threads.KThread;
import nachos.threads.Semaphore;

/**
 * Tests the <tt>ElevatorBank</tt> module, using a single elevator and a single
 * rider.
 */
public final class ElevatorTest {
    /**
     * Allocate a new <tt>ElevatorTest</tt> object.
     */
    public ElevatorTest() {
    }

    /**
     * Run a test on <tt>Machine.bank()</tt>.
     */
    public void run() {
	Machine.bank().init(1, 2, new ElevatorController());

	int[] stops = { 1 };
	
	Machine.bank().addRider(new Rider(), 0, stops);

	Machine.bank().run();
    }
    
    private class ElevatorController implements ElevatorControllerInterface {
	public void initialize(ElevatorControls controls) {
	    this.controls = controls;

	    eventWait = new Semaphore(0);

	    controls.setInterruptHandler(new Runnable() {
		    public void run() { interrupt(); }
		});
	}

	public void run() {
	    ElevatorEvent e;

	    Lib.assertTrue(controls.getFloor(0) == 0);
	    
	    e = getNextEvent();
	    Lib.assertTrue(e.event == ElevatorEvent.eventUpButtonPressed &&
		       e.floor == 0);

	    controls.setDirectionDisplay(0, dirUp);
	    controls.openDoors(0);

	    e = getNextEvent();
	    Lib.assertTrue(e.event == ElevatorEvent.eventFloorButtonPressed &&
		       e.floor == 1);

	    controls.closeDoors(0);
	    controls.moveTo(1, 0);

	    e = getNextEvent();
	    Lib.assertTrue(e.event == ElevatorEvent.eventElevatorArrived &&
		       e.floor == 1 &&
		       e.elevator == 0);

	    controls.openDoors(0);

	    e = getNextEvent();
	    Lib.assertTrue(e.event == ElevatorEvent.eventRidersDone);

	    controls.finish();
	    Lib.assertNotReached();
	}

	private void interrupt() {
	    eventWait.V();
	}

	private ElevatorEvent getNextEvent() {
	    ElevatorEvent event;
	    while (true) {
		if ((event = controls.getNextEvent()) != null)
		    break;

		eventWait.P();
	    }
	    return event;
	}

	private ElevatorControls controls;
	private Semaphore eventWait;
    }

    private class Rider implements RiderInterface {
	public void initialize(RiderControls controls, int[] stops) {
	    this.controls = controls;
	    Lib.assertTrue(stops.length == 1 && stops[0] == 1);

	    eventWait = new Semaphore(0);

	    controls.setInterruptHandler(new Runnable() {
		    public void run() { interrupt(); }
		});
	}

	public void run() {
	    RiderEvent e;

	    Lib.assertTrue(controls.getFloor() == 0);

	    controls.pressUpButton();

	    e = getNextEvent();
	    Lib.assertTrue(e.event == RiderEvent.eventDoorsOpened &&
		       e.floor == 0 &&
		       e.elevator == 0);
	    Lib.assertTrue(controls.getDirectionDisplay(0) == dirUp);

	    Lib.assertTrue(controls.enterElevator(0));
	    controls.pressFloorButton(1);

	    e = getNextEvent();
	    Lib.assertTrue(e.event == RiderEvent.eventDoorsClosed &&
		       e.floor == 0 &&
		       e.elevator == 0);

	    e = getNextEvent();
	    Lib.assertTrue(e.event == RiderEvent.eventDoorsOpened &&
		       e.floor == 1 &&
		       e.elevator == 0);

	    Lib.assertTrue(controls.exitElevator(1));

	    controls.finish();
	    Lib.assertNotReached();
	}

	private void interrupt() {
	    eventWait.V();
	}

	private RiderEvent getNextEvent() {
	    RiderEvent event;
	    while (true) {
		if ((event = controls.getNextEvent()) != null)
		    break;

		eventWait.P();
	    }
	    return event;
	}

	private RiderControls controls;
	private Semaphore eventWait;
    }
}