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/*******************************************************************************
* Copyright (c) 2006 IBM Corporation.
* 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 - Jeff Briggs, Henry Hughes, Ryan Morse
*******************************************************************************/
package org.eclipse.linuxtools.systemtap.ui.ide.structures;
import java.io.File;
import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.linuxtools.internal.systemtap.ui.ide.IDEPlugin;
import org.eclipse.linuxtools.internal.systemtap.ui.ide.Localization;
import org.eclipse.linuxtools.internal.systemtap.ui.ide.preferences.IDEPreferenceConstants;
import org.eclipse.linuxtools.systemtap.ui.ide.IDESessionSettings;
import org.eclipse.linuxtools.systemtap.ui.structures.TreeNode;
import org.eclipse.linuxtools.systemtap.ui.structures.listeners.IUpdateListener;
import org.eclipse.linuxtools.systemtap.ui.systemtapgui.preferences.PreferenceConstants;
import org.eclipse.ui.PlatformUI;
/**
* This class is used for obtaining all probes and functions from the tapsets.
* It will initially try to obtain the list from the TreeSettings.xml file, but
* if there is a problem doing that it will run the TapsetParser in order to
* obtain everything that way.
* @author Ryan Morse
*/
public final class TapsetLibrary {
public static TreeNode getProbes() {
return probeTree;
}
public static TreeNode getFunctions() {
return functionTree;
}
/**
* This method will attempt to get the most up-to-date information.
* However, if the TapsetParser is running already it will quit,
* assuming that new information will be available soon. By registering
* a listener at that point the class can be notified when an update is
* available.
*/
public static void init() {
if (null != stpp && stpp.isRunning()) {
return;
}
IPreferenceStore preferenceStore = IDEPlugin.getDefault().getPreferenceStore();
if (preferenceStore.contains(IDEPreferenceConstants.P_STORED_TREE)
&& preferenceStore.getBoolean(IDEPreferenceConstants.P_STORED_TREE)
&& isTreeFileCurrent()) {
readTreeFile();
} else {
runStapParser();
}
}
/**
* This method will create a new instance of the TapsetParser in order
* to get the information directly from the files.
*/
private static void runStapParser() {
String[] tapsets = IDEPlugin.getDefault().getPreferenceStore()
.getString(IDEPreferenceConstants.P_TAPSETS).split(File.pathSeparator);
stpp = new TapsetParser(tapsets);
stpp.start();
stpp.addListener(completionListener);
functionTree = stpp.getFunctions();
probeTree = stpp.getProbes();
}
public static boolean isFinishSuccessful(){
return stpp.isFinishSuccessful();
}
/**
* This method will get all of the tree information from
* the TreeSettings xml file.
*/
private static void readTreeFile() {
functionTree = TreeSettings.getFunctionTree();
probeTree = TreeSettings.getProbeTree();
}
/**
* This method checks to see if the tapsets have changed
* at all since the TreeSettings.xml file was created.
* @return boolean indicating whether or not the TreeSettings.xml file has the most up-to-date version
*/
private static boolean isTreeFileCurrent() {
long treesDate = TreeSettings.getTreeFileDate();
IPreferenceStore p = IDEPlugin.getDefault().getPreferenceStore();
String[] tapsets = p.getString(IDEPreferenceConstants.P_TAPSETS).split(File.pathSeparator);
File f = getTapsetLocation(p);
if (!checkIsCurrentFolder(treesDate, f)) {
return false;
}
if(null != tapsets) {
for(int i=0; i<tapsets.length; i++) {
f = new File(tapsets[i]);
if (f.lastModified() > treesDate) {
return false;
}
if (f.canRead() && !checkIsCurrentFolder(treesDate, f)) {
return false;
}
}
}
return true;
}
/**
* This method attempts to locate the default tapset directory.
* @param p Preference store where the tapset location might be stored
* @return File representing the default tapset location.
*/
public static File getTapsetLocation(IPreferenceStore p) {
File f;
String path = p.getString(PreferenceConstants.P_ENV[2][0]);
if(path.trim().equals("")) { //$NON-NLS-1$
f = new File("/usr/share/systemtap/tapset"); //$NON-NLS-1$
if(!f.exists()) {
f = new File("/usr/local/share/systemtap/tapset"); //$NON-NLS-1$
if(!f.exists()) {
InputDialog i = new InputDialog(
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(),
Localization.getString("TapsetBrowserView.TapsetLocation"), Localization.getString("TapsetBrowserView.WhereDefaultTapset"), "", null); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
i.open();
p.setValue(PreferenceConstants.P_ENV[2][0], i.getValue());
f = new File( i.getValue() );
}
}
} else {
f = new File( p.getString(path) );
}
IDESessionSettings.tapsetLocation = f.getAbsolutePath();
return f;
}
/**
* This method checks the provided time stap against the folders
* time stamp. This is to see if the folder may have new data in it
* @param time The current time stamp
* @param folder The folder to check if it is newer the then time stamp
* @return boolean indicating whether the time stamp is newer then the folder
*/
private static boolean checkIsCurrentFolder(long time, File folder) {
File[] fs = folder.listFiles();
for(int i=0; i<fs.length; i++) {
if (fs[i].lastModified() > time) {
return false;
}
if (fs[i].isDirectory() && fs[i].canRead()
&& !checkIsCurrentFolder(time, fs[i])) {
return false;
}
}
return true;
}
/**
* Adds a new listener to the TapsetParser
* @param listener the listener to be added
* @return boolean indicating whether or not the listener was added
*/
public static boolean addListener(IUpdateListener listener) {
if(null == stpp)
return false;
stpp.addListener(listener);
return true;
}
/**
* Removes the provided listener from the tapsetParser.
* @param listener The listener to be removed from the tapsetParser
*/
public static void removeUpdateListener(IUpdateListener listener) {
stpp.removeListener(listener);
}
/**
* This class handles saving the results of the TapsetParser to
* the TreeSettings.xml file.
*/
private static final IUpdateListener completionListener = new IUpdateListener() {
public void handleUpdateEvent() {
functionTree = stpp.getFunctions();
probeTree = stpp.getProbes();
if(stpp.isFinishSuccessful()){
TreeSettings.setTrees(functionTree, probeTree);
synchronized (stpp) {
stpp.notifyAll();
}
}
}
};
/**
* Blocks the current thread until the parser has finished
* parsing probes and functions.
* @since 2.0
*/
public static void waitForInitialization() {
while (!stpp.isFinishSuccessful()){
try {
synchronized (stpp) {
stpp.wait(5000);
}
} catch (InterruptedException e) {
break;
}
}
}
/**
* This method will stop services started by
* {@link TapsetLibrary#init()} such as the {@link TapsetParser}
* @since 1.2
*/
public static void stop(){
if(null != stpp && stpp.isRunning()){
stpp.stop();
}
}
private static TreeNode functionTree = null;
private static TreeNode probeTree = null;
private static TapsetParser stpp = null;
}
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