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Alex Rivera
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How can you avoid circular dependencies when you're designing two classes with a producer/consumer relationship? Here ListenerImpl needs a reference to Broadcaster in order to register/unregister itself, and Broadcaster needs a reference back to the Listeners in order to send messages. This example is in Java but it can apply to any OO language. public interface Listener { void callBack(Object arg); } public class ListenerImpl implements Listener { public ListenerImpl(Broadcaster b) { b.register(this); } public void callBack(Object arg) { ... } public void shutDown() { b.unregister(this); } } public class Broadcaster { private final List listeners = new ArrayList(); public void register(Listener lis) { listeners.add(lis); } public void unregister(Listener lis) {listeners.remove(lis); } public void broadcast(Object arg) { for (Listener lis : listeners) { lis.callBack(arg); } } }
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