| /******************************************************************************* |
| * Copyright (c) 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.e4.core.contexts; |
| |
| /** |
| * Extended version of a runnable that can be used with the |
| * {@link IEclipseContext#runAndTrack(RunAndTrack)} version gets more detailed |
| * information on the change, such as the service name and the event type. |
| */ |
| abstract public class RunAndTrack { |
| |
| /** |
| * Creates a new instance of trackable computation |
| */ |
| public RunAndTrack() { |
| // placeholder |
| } |
| |
| /** |
| * The method will be called before the associated context is disposed of. |
| * <p> |
| * Subclasses may override this method. Overrides should finish the processing |
| * by calling this method in the superclass. |
| * </p> |
| * @param context the context being disposed of |
| * @deprecated this method will be removed; use IContextDisposalListener instead |
| */ |
| public void disposed(IEclipseContext context) { |
| // subclasses may override |
| } |
| |
| /** |
| * This method is initially called by the framework when an instance of this |
| * class is associated with the context via {@link IEclipseContext#runAndTrack(RunAndTrack)}. |
| * <p> |
| * After the initial call this method is executed when one or more values it retrieved |
| * from the context change. |
| * </p> |
| * @param context modified context |
| * @return <code>true</code> to continue to be called on updates; <code>false</code> otherwise |
| */ |
| abstract public boolean changed(IEclipseContext context); |
| } |
