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/*******************************************************************************
* Copyright (c) 2008, 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.equinox.p2.examples.rcp.sdkbundlevisibility.p2;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;
import org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob;
import org.eclipse.equinox.p2.ui.ProvisioningUI;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;
/**
* PreloadingRepositoryHandler provides background loading of
* repositories before executing the provisioning handler.
*
* @since 3.5
*/
abstract class PreloadingRepositoryHandler extends AbstractHandler {
/**
* The constructor.
*/
public PreloadingRepositoryHandler() {
// constructor
}
/**
* Execute the command.
*/
public Object execute(ExecutionEvent event) {
doExecuteAndLoad();
return null;
}
void doExecuteAndLoad() {
if (preloadRepositories()) {
//cancel any load that is already running
Job.getJobManager().cancel(LoadMetadataRepositoryJob.LOAD_FAMILY);
final LoadMetadataRepositoryJob loadJob = new LoadMetadataRepositoryJob(getProvisioningUI());
setLoadJobProperties(loadJob);
if (waitForPreload()) {
loadJob.addJobChangeListener(new JobChangeAdapter() {
public void done(IJobChangeEvent event) {
if (PlatformUI.isWorkbenchRunning())
if (event.getResult().isOK()) {
PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
public void run() {
doExecute(loadJob);
}
});
}
}
});
loadJob.setUser(true);
loadJob.schedule();
} else {
loadJob.setSystem(true);
loadJob.setUser(false);
loadJob.schedule();
doExecute(null);
}
} else {
doExecute(null);
}
}
protected abstract void doExecute(LoadMetadataRepositoryJob job);
protected boolean preloadRepositories() {
return true;
}
protected boolean waitForPreload() {
return true;
}
protected void setLoadJobProperties(Job loadJob) {
loadJob.setProperty(LoadMetadataRepositoryJob.ACCUMULATE_LOAD_ERRORS, Boolean.toString(true));
}
protected ProvisioningUI getProvisioningUI() {
return ProvisioningUI.getDefaultUI();
}
/**
* Return a shell appropriate for parenting dialogs of this handler.
* @return a Shell
*/
protected Shell getShell() {
return getProvisioningUI().getDefaultParentShell();
}
}
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