Examples of org.eclipse.core.runtime.ListenerList | massapi.com

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Package org.eclipse.core.runtime

Examples of org.eclipse.core.runtime.ListenerList

org.eclipse.core.runtime.ListenerList
This class is a thread safe list that is designed for storing lists of listeners. The implementation is optimized for minimal memory footprint, frequent reads and infrequent writes. Modification of the list is synchronized and relatively expensive, while accessing the listeners is very fast. Readers are given access to the underlying array data structure for reading, with the trust that they will not modify the underlying array.
A listener list handles the same listener being added multiple times, and tolerates removal of listeners that are the same as other listeners in the list. For this purpose, listeners can be compared with each other using either equality or identity, as specified in the list constructor.
Use the getListeners method when notifying listeners. The recommended code sequence for notifying all registered listeners of say, FooListener.eventHappened, is:
```
 Object[] listeners = myListenerList.getListeners(); for (int i = 0; i < listeners.length; ++i) { ((FooListener) listeners[i]).eventHappened(event); } 
```
This class can be used without OSGi running.
@since org.eclipse.equinox.common 3.2


  private ListenerList listeners;


  public AbstractModel(IModelElement parent, String name) {
    super(parent, name);
    listeners = new ListenerList();
  }

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   * @param listener
   *            The listener to be added; must not be <code>null</code>.
   */
  protected synchronized final void addListenerObject(final Object listener) {
    if (listenerList == null) {
      listenerList = new ListenerList(ListenerList.IDENTITY);
    }


    listenerList.add(listener);
  }

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   * 
   * @return The listeners currently attached; may be empty, but never
   *         <code>null</code>
   */
  protected final Object[] getListeners() {
    final ListenerList list = listenerList;
    if (list == null) {
      return EMPTY_ARRAY;
    }


    return list.getListeners();
  }

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