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/*******************************************************************************
* Copyright (c) 2004, 2008 Tasktop Technologies 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:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.provisional.commons.ui;
import java.util.Arrays;
import java.util.LinkedHashSet;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.ui.progress.WorkbenchJob;
/**
* TODO use extensible deltas instead of Objects for refresh
*
* @author Steffen Pingel
* @author Mik Kersten
*/
public abstract class DelayedRefreshJob extends WorkbenchJob {
static final long REFRESH_DELAY_DEFAULT = 200;
static final long REFRESH_DELAY_MAX = REFRESH_DELAY_DEFAULT * 2;
// FIXME make private
protected final StructuredViewer viewer;
private static final int NOT_SCHEDULED = -1;
private final LinkedHashSet<Object> queue = new LinkedHashSet<Object>();
private long scheduleTime = NOT_SCHEDULED;
public DelayedRefreshJob(StructuredViewer viewer, String name) {
super(name);
Assert.isNotNull(viewer);
this.viewer = viewer;
setSystem(true);
}
// XXX needs to be called from UI thread
public void refreshNow() {
queue.add(null);
runInUIThread(new NullProgressMonitor());
}
public synchronized void refresh() {
refreshElement(null);
}
public synchronized void refreshElements(Object[] elements) {
queue.addAll(Arrays.asList(elements));
if (scheduleTime == NOT_SCHEDULED) {
scheduleTime = System.currentTimeMillis();
schedule(REFRESH_DELAY_DEFAULT);
} else if (System.currentTimeMillis() - scheduleTime < REFRESH_DELAY_MAX - REFRESH_DELAY_DEFAULT) {
// reschedule to aggregate more refreshes
cancel();
schedule(REFRESH_DELAY_DEFAULT);
}
}
public synchronized void refreshElement(Object element) {
refreshElements(new Object[] { element });
}
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
if (viewer.getControl() == null || viewer.getControl().isDisposed()) {
return Status.CANCEL_STATUS;
}
final Object[] items;
synchronized (this) {
if (queue.contains(null)) {
items = null;
} else {
items = queue.toArray(new Object[0]);
}
queue.clear();
scheduleTime = NOT_SCHEDULED;
}
doRefresh(items);
return Status.OK_STATUS;
}
protected abstract void doRefresh(final Object[] items);
}
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