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Each clock is available as a service called a Timer. A timer has methods to get and set the time, and in addition it knows if it has a valid time or if it has an invalid time (and so should be shown flashing). A timer can have its time set; when it does, it becomes valid and the display stops flashing. The interface for a timer is as follows: /** * Timer service */ package clock.service; import java.rmi.Remote; import java.rmi.RemoteException; import java.util.Date; public interface Timer extends Remote {
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CHAPTER 18 EXAMPLE: FLASHING CLOCKS
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public void setTime(Date t) throws RemoteException; public Date getTime() throws RemoteException; public boolean isValidTime() throws RemoteException; }
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TickerTimer
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I ll give two implementations of this service. The first is given in this section and is the dumb one: when the timer starts, it guesses at a start time and enters an invalid state. It uses a separate thread (a ticker ) to keep increasing its time every second (approximately). When its time is set, it becomes valid, but it will probably drift from the correct time due to its use of a sleep to keep changing the time. The dumb ticker timer is as follows: package clock.service; import java.util.Date; import java.rmi.RemoteException; public class TickerTimer implements Timer { private Date time; private boolean isValid; private Ticker ticker; /** * Constructor with no starting time has * invalid timer and any time */ public TickerTimer() { time = new Date(0); isValid = false; ticker = new Ticker(time); ticker.start(); } public TickerTimer(Date t) { time = t; isValid = true; ticker = new Ticker(time); ticker.start(); } public void setTime(Date t) { System.out.println("Setting time to " + t); time = t; isValid = true; if (ticker != null) { ticker.stopRunning(); } ticker = new Ticker(time); ticker.start(); }
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CHAPTER 18 EXAMPLE: FLASHING CLOCKS
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public Date getTime() { return ticker.getTime(); } public boolean isValidTime() { if (isValid) { return true; } else { return false; } } } class Ticker extends Thread { private Date time; private boolean keepRunning = true; public Ticker(Date t) { time = t; } public Date getTime() { return time; } public void run() { while (keepRunning) { try { sleep(1000); } catch(InterruptedException e) { } time = new Date(time.getTime() + 1000); } } public void stopRunning() { keepRunning = false; } }
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ComputerTimer
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This section describes the second implementation of a timer. This timer uses the computer s internal clock to always return the correct time on request. It is always valid. package clock.service; import java.util.Date; import net.jini.core.event.*; import java.util.Vector; import java.rmi.RemoteException; public class ComputerTimer implements Timer { public ComputerTimer() { } public void setTime(Date t) {
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CHAPTER 18 EXAMPLE: FLASHING CLOCKS
// void } public Date getTime() { return new Date(); } public boolean isValidTime() { return true; } }
ClockFrame
To make the clocks more visual, we can put the timers into a Swing frame and watch them ticking away. The following code is based on that of Satoshi Konno for UPnP. A clock pane is as follows: /** * Copyright (C) Satoshi Konno 2002 * Minor changes Jan Newmarch */ package clock.clock; import clock.device.*; import java.io.*; import java.awt.*; import java.awt.geom.*; import java.awt.image.*; import javax.swing.*; import javax.imageio.ImageIO; import java.rmi.RemoteException; import java.util.Date; import java.text.DateFormat; import java.text.SimpleDateFormat; public class ClockPane extends JPanel { private ClockDevice clockDev; private Color lastBlink = Color.BLACK; private DateFormat dateFormat = new SimpleDateFormat("kk:mm:ss"); public ClockPane(ClockDevice clockDev) { this.clockDev = clockDev; loadImage(); initPanel(); } //////////////////////////////////////////////// // Background ////////////////////////////////////////////////
CHAPTER 18 EXAMPLE: FLASHING CLOCKS
private private private private
final final final final
static static static static
int DEFAULT_WIDTH = 200; int DEFAULT_HEIGHT = 60; String CLOCK_PANEL_IMAGE = "images/clock.jpg"; String CLOCK_PANEL_IMAGE_FILE = "resources/" + CLOCK_PANEL_IMAGE;
private Image panelmage; private int imageWidth = DEFAULT_WIDTH; private int imageHeight = DEFAULT_HEIGHT; private void loadImage() { // Try to get the image form the local file system File f = new File(CLOCK_PANEL_IMAGE_FILE); try { panelmage = ImageIO.read(f); imageWidth = ((BufferedImage) panelmage).getWidth(); imageHeight = ((BufferedImage) panelmage).getHeight(); return; } catch (Exception e) { // Not in local file system } // Try to get the image from classpath jar files java.net.URL url = getClass().getClassLoader(). getResource(CLOCK_PANEL_IMAGE); if (url != null) { ImageIcon icon = new ImageIcon(url); panelmage = icon.getImage(); imageWidth = icon.getIconWidth(); imageHeight = icon.getIconHeight(); return; } // couldn't find an image, leave panelmage as null } private Image getPaneImage() { return panelmage; } //////////////////////////////////////////////// // Background //////////////////////////////////////////////// private void initPanel() {
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