Uncle Bob's Agile Development Corner
OBSERVER—Evolving into a pattern, Part 2
by Robert C. Martin
Listing 6.

public class MockTimeSource implements TimeSource
    TimeSourceImplementation tsImp =
        new TimeSourceImplementation();

    public void registerObserver(ClockObserver observer)
    public void setTime(int hours, int minutes, int seconds)
        tsImp.notify(hours, minutes, seconds);

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


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