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package concurrency.composingobjects;

import java.util.List;

import java.util.concurrent.CopyOnWriteArrayList;

/**

* Delegating Thread Safety to Multiple Underlying State Variables.

*

* VisualComponent uses a CopyOnWriteArrayList to store each listener list;

* this is a thread safe List implementation particularly suited for managing

* listener lists (see Section 5.2.3). Each List is thread safe, and

* because there are no constraints coupling the state of one to the

* state of the other, VisualComponent can delegate its thread safety

* responsibilities to the underlying mouseListeners and keyListeners objects.

*

* @author vijay

*/

public class VisualComponent {

public final List<MouseListener> mouseListeners = new CopyOnWriteArrayList<MouseListener>();

public final List<KeyListener> keyListeners = new CopyOnWriteArrayList<KeyListener>();

public void addMouseListener(MouseListener m) {

mouseListeners.add(m);

}

public void removeMouseListener(MouseListener m) {

mouseListeners.remove(m);

}

public void addKeyListener(KeyListener k) {

keyListeners.add(k);

}

public void removeKeyListener(KeyListener k) {

keyListeners.remove(k);

}

}

class MouseListener {

}

class KeyListener {

}