Uncle Bob's Agile Development Corner
OBSERVEREvolving into a pattern, Part 2
by Robert C. Martin
Listing 4. TimeSource.java.
public interface TimeSource
public void registerObserver(ClockObserver observer);
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 firstname.lastname@example.org.