/*******************************************************************************
* Copyright (c) 2004, 2011 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.wst.jsdt.web.core.internal;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.ISaveContext;
import org.eclipse.core.resources.ISaveParticipant;
import org.eclipse.core.resources.ISavedState;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Plugin;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.wst.jsdt.internal.core.util.Messages;
import org.eclipse.wst.jsdt.web.core.javascript.search.JsIndexManager;
import org.osgi.framework.BundleContext;
/**
*
* Provisional API: This class/interface is part of an interim API that is still under development and expected to
* change significantly before reaching stability. It is being made available at this early stage to solicit feedback
* from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
* (repeatedly) as the API evolves.
*/
public class JsCorePlugin extends Plugin {
// The shared instance.
private static JsCorePlugin plugin;
public static final String PLUGIN_ID = "org.eclipse.wst.jsdt.web.core"; //$NON-NLS-1$
/**
* <p>Job used to finish tasks needed to start up the plugin but that did not have
* to block the plugin start up process.</p>
*/
private Job fPluginInitializerJob;
/**
* Returns the shared instance.
*/
public static JsCorePlugin getDefault() {
return JsCorePlugin.plugin;
}
/**
* The constructor.
*/
public JsCorePlugin() {
super();
JsCorePlugin.plugin = this;
this.fPluginInitializerJob = new PluginInitializerJob();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.core.runtime.Plugin#start(org.osgi.framework.BundleContext)
*/
public void start(BundleContext context) throws Exception {
super.start(context);
// JSPIndexManager depends on TaglibController, so TaglibController
// should be started first
// listen for classpath changes
JsIndexManager.getInstance().initialize();
// listen for resource changes to update content properties keys
//schedule delayed initialization
this.fPluginInitializerJob.schedule(2000);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.core.runtime.Plugin#stop(org.osgi.framework.BundleContext)
*/
public void stop(BundleContext context) throws Exception {
// stop listenning for resource changes to update content properties
// keys
// stop any indexing
JsIndexManager.getInstance().shutdown();
//Stop the resource event manager
JSWebResourceEventManager.getDefault().stop();
super.stop(context);
}
/**
* <p>A {@link Job} used to perform delayed initialization for the plugin</p>
*/
private static class PluginInitializerJob extends Job {
/**
* <p>Default constructor to set up this {@link Job} as a
* long running system {@link Job}</p>
*/
protected PluginInitializerJob() {
super(Messages.javamodel_initialization);
this.setUser(false);
this.setSystem(true);
this.setPriority(Job.LONG);
}
/**
* <p>Perform delayed initialization for the plugin</p>
*
* @see org.eclipse.core.runtime.jobs.Job#run(org.eclipse.core.runtime.IProgressMonitor)
*/
protected IStatus run(IProgressMonitor monitor) {
IStatus status = Status.OK_STATUS;
final IWorkspace workspace = ResourcesPlugin.getWorkspace();
try {
/*
* Restore save state and process any events that happened before
* plug-in loaded. Don't do it immediately since adding the save
* participant requires a lock on the workspace to compute the
* accumulated deltas, and if the tree is not already locked it
* becomes a blocking call.
*/
workspace.run(new IWorkspaceRunnable() {
public void run(final IProgressMonitor worspaceMonitor) throws CoreException {
ISavedState savedState = null;
try {
//add the save participant for this bundle
savedState = ResourcesPlugin.getWorkspace().addSaveParticipant(
JsCorePlugin.plugin.getBundle().getSymbolicName(), new SaveParticipant());
} catch (CoreException e) {
Logger.logException("JSP Core Plugin failed at loading previously saved state." + //$NON-NLS-1$
" All componenets dependent on this state will start as if first workspace load.", e); //$NON-NLS-1$
}
//if there is a saved state start up using that, else start up cold
if(savedState != null) {
try {
Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
} finally {
savedState.processResourceChangeEvents(new IResourceChangeListener() {
/**
* @see org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org.eclipse.core.resources.IResourceChangeEvent)
*/
public void resourceChanged(IResourceChangeEvent event) {
JSWebResourceEventManager.getDefault().start(event.getDelta(), worspaceMonitor);
}
});
}
} else {
JSWebResourceEventManager.getDefault().start(null, worspaceMonitor);
}
}
}, monitor);
} catch(CoreException e) {
status = e.getStatus();
}
return status;
}
}
/**
* Used so that all of the IResourceChangeEvents that occurred before
* this plugin loaded can be processed.
*/
private static class SaveParticipant implements ISaveParticipant {
/**
* <p>Default constructor</p>
*/
protected SaveParticipant() {
}
/**
* @see org.eclipse.core.resources.ISaveParticipant#doneSaving(org.eclipse.core.resources.ISaveContext)
*/
public void doneSaving(ISaveContext context) {
//ignore
}
/**
* @see org.eclipse.core.resources.ISaveParticipant#prepareToSave(org.eclipse.core.resources.ISaveContext)
*/
public void prepareToSave(ISaveContext context) throws CoreException {
//ignore
}
/**
* @see org.eclipse.core.resources.ISaveParticipant#rollback(org.eclipse.core.resources.ISaveContext)
*/
public void rollback(ISaveContext context) {
//ignore
}
/**
* @see org.eclipse.core.resources.ISaveParticipant#saving(org.eclipse.core.resources.ISaveContext)
*/
public void saving(ISaveContext context) throws CoreException {
context.needDelta();
}
}
}