/*******************************************************************************
* Copyright (c) 2004, 2010 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.jst.jsp.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.jdt.core.JavaCore;
import org.eclipse.jst.jsp.core.internal.contentmodel.TaglibController;
import org.eclipse.jst.jsp.core.internal.contentproperties.JSPFContentPropertiesManager;
import org.eclipse.jst.jsp.core.internal.contenttype.DeploymentDescriptorPropertyCache;
import org.eclipse.jst.jsp.core.internal.java.search.JSPIndexManager;
import org.eclipse.jst.jsp.core.internal.taglib.TaglibHelperManager;
import org.eclipse.jst.jsp.core.taglib.TaglibIndex;
import org.osgi.framework.BundleContext;
/**
* The main plugin class to be used in the desktop.
*/
public class JSPCorePlugin extends Plugin {
/** singleton instance of the plugin */
private static JSPCorePlugin plugin;
/**
* <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;
/**
* The constructor.
*/
public JSPCorePlugin() {
super();
plugin = this;
this.fPluginInitializerJob = new PluginInitializerJob();
}
/**
* Returns the shared instance.
*/
public static JSPCorePlugin getDefault() {
return plugin;
}
/*
* (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
*/
TaglibIndex.startup();
TaglibController.startup();
// listen for classpath changes
JavaCore.addElementChangedListener(TaglibHelperManager.getInstance());
//schedule delayed initialization
this.fPluginInitializerJob.schedule(2000);
// listen for resource changes to update content properties keys
JSPFContentPropertiesManager.startup();
DeploymentDescriptorPropertyCache.start();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.core.runtime.Plugin#stop(org.osgi.framework.BundleContext)
*/
public void stop(BundleContext context) throws Exception {
DeploymentDescriptorPropertyCache.stop();
// stop listening for resource changes to update content properties keys
JSPFContentPropertiesManager.shutdown();
//remove the plugin save participant
ResourcesPlugin.getWorkspace().removeSaveParticipant(plugin.getBundle().getSymbolicName());
// stop any indexing
JSPIndexManager.getDefault().stop();
// stop listening for classpath changes
JavaCore.removeElementChangedListener(TaglibHelperManager.getInstance());
// stop taglib controller
TaglibController.shutdown();
TaglibIndex.shutdown();
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(JSPCoreMessages.JSPCorePlugin_Initializing_JSP_Tools);
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(
JSPCorePlugin.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) {
JSPIndexManager.getDefault().start(event.getDelta(), worspaceMonitor);
}
});
}
} else {
JSPIndexManager.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();
}
}
}