TimeSourceImplementation.java.

Uncle Bob's Agile Development Corner
OBSERVER—Evolving into a pattern, Part 2
by Robert C. Martin
Listing 5. TimeSourceImplementation.java.


import java.util.*;

public class TimeSourceImplementation
{
    private Vector itsObservers = new Vector();

    public void notify(int hours, int minutes, int seconds)
    {
        Iterator i = itsObservers.iterator();
        while (i.hasNext())
        {
            ClockObserver observer = (ClockObserver) i.next();
            observer.update(hours, minutes, seconds);
        }
    }

    public void registerObserver(ClockObserver observer)
    {
        itsObservers.add(observer);
    }
}

About the Author

Robert C. Martin is president of Object Mentor Inc., a firm that offers high-level, OO software design consulting, training, and development services. He is the author of Designing Object Oriented C++ Applications Using the Booch Method. He can be contacted at rmartin@objectmentor.com.

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