plugins/org.eclipse.sphinx.platform/src/org/eclipse/sphinx/platform/stats/PerformanceStatsLog.java - sphinx/org.eclipse.sphinx - Git at Google

 /**
  * <copyright>
  *
  * Copyright (c) 2008-2010 See4sys and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
  *
  * Contributors:
  *     See4sys - Initial API and implementation
  *
  * </copyright>
  */
 package org.eclipse.sphinx.platform.stats;

 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.io.Reader;
 import java.io.StringWriter;
 import java.io.UnsupportedEncodingException;
 import java.io.Writer;
 import java.lang.reflect.InvocationTargetException;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.Properties;
 import java.util.PropertyPermission;

 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.osgi.framework.log.FrameworkLog;
 import org.eclipse.osgi.framework.log.FrameworkLogEntry;
 import org.eclipse.sphinx.platform.util.PlatformLogUtil;
 import org.osgi.framework.Bundle;
 import org.osgi.framework.BundleException;
 import org.osgi.framework.FrameworkEvent;

 /**
  * The FrameworkLog implementation for Eclipse.
  * <p>
  * Clients may extend this class.
  * </p>
  *
  * @since 0.7.0
  */
 public class PerformanceStatsLog implements FrameworkLog {

 	private static final String PASSWORD = "-password"; //$NON-NLS-1$
 	/** The session tag */
 	protected static final String SESSION = "!SESSION"; //$NON-NLS-1$
 	/** The entry tag */
 	protected static final String ENTRY = "!ENTRY"; //$NON-NLS-1$
 	/** The sub-entry tag */
 	protected static final String SUBENTRY = "!SUBENTRY"; //$NON-NLS-1$
 	/** The message tag */
 	protected static final String MESSAGE = "!MESSAGE"; //$NON-NLS-1$
 	/** The stacktrace tag */
 	protected static final String STACK = "!STACK"; //$NON-NLS-1$

 	/** The line separator used in the log output */
 	protected static final String LINE_SEPARATOR;
 	/** The tab character used in the log output */
 	protected static final String TAB_STRING = "\t"; //$NON-NLS-1$
 	private static final String USING_SYSTEM_PROPERTIES_KEY = "osgi.framework.useSystemProperties";//$NON-NLS-1$
 	// Constants for rotating log file
 	/** The default size a log file can grow before it is rotated */
 	public static final int DEFAULT_LOG_SIZE = 1000000;
 	/** The default number of backup log files */
 	public static final int DEFAULT_LOG_FILES = 10;
 	/** The minimum size limit for log rotation */
 	public static final int LOG_SIZE_MIN = 1000000;

 	/** The system property used to specify the log level */
 	public static final String PROP_LOG_LEVEL = "eclipse.log.level"; //$NON-NLS-1$
 	/** The system property used to specify size a log file can grow before it is rotated */
 	public static final String PROP_LOG_SIZE_MAX = "eclipse.log.size.max"; //$NON-NLS-1$
 	/** The system property used to specify the maximum number of backup log files to use */
 	public static final String PROP_LOG_FILE_MAX = "eclipse.log.backup.max"; //$NON-NLS-1$
 	/** The extension used for log files */
 	public static final String LOG_EXT = ".log"; //$NON-NLS-1$
 	/** The extension markup to use for backup log files */
 	public static final String BACKUP_MARK = ".bak_"; //$NON-NLS-1$
 	private static Properties properties;
 	public static final String PROP_LOGFILE = "osgi.logfile"; //$NON-NLS-1$
 	/** Indicates if the console messages should be printed to the console (System.out) */
 	protected boolean consoleLog = false;
 	/** Indicates if the next log message is part of a new session */
 	protected boolean newSession = true;
 	/**
 	 * The File object to store messages. This value may be null.
 	 */
 	protected File outFile;

 	/**
 	 * The Writer to log messages to.
 	 */
 	protected Writer writer;

 	int maxLogSize = DEFAULT_LOG_SIZE; // The value is in KB.
 	int maxLogFiles = DEFAULT_LOG_FILES;
 	int backupIdx = 0;

 	private int logLevel = FrameworkLogEntry.OK;

 	/**
 	 * Constructs an EclipseLog which uses the specified File to log messages to
 	 *
 	 * @param outFile
 	 *            a file to log messages to
 	 */
 	static {
 		String s = System.getProperty("line.separator"); //$NON-NLS-1$
 		LINE_SEPARATOR = s == null ? "\n" : s; //$NON-NLS-1$
 		Properties systemProperties = System.getProperties();
 		String usingSystemProperties = systemProperties.getProperty(USING_SYSTEM_PROPERTIES_KEY);

 		if (usingSystemProperties == null || usingSystemProperties.equalsIgnoreCase(Boolean.TRUE.toString())) {
 			properties = systemProperties;
 		} else {
 			// use systemProperties for a snapshot
 			// also see requirements in Bundlecontext.getProperty(...))
 			properties = new Properties();
 			// snapshot of System properties for uses of getProperties who expect to see framework properties set as
 			// System properties
 			// we need to do this for all system properties because the properties object is used to back
 			// BundleContext#getProperty method which expects all system properties to be available
 			properties.putAll(systemProperties);
 		}
 	}

 	public PerformanceStatsLog(File outFile) {
 		this.outFile = outFile;
 		writer = null;
 		readLogProperties();
 	}

 	/**
 	 * Constructs an EclipseLog which uses the specified Writer to log messages to
 	 *
 	 * @param writer
 	 *            a writer to log messages to
 	 */
 	public PerformanceStatsLog(Writer writer) {
 		if (writer == null) {
 			// log to System.err by default
 			this.writer = logForStream(System.err);
 		} else {
 			this.writer = writer;
 		}
 	}

 	private Throwable getRoot(Throwable t) {
 		Throwable root = null;
 		if (t instanceof BundleException) {
 			root = ((BundleException) t).getNestedException();
 		}
 		if (t instanceof InvocationTargetException) {
 			root = ((InvocationTargetException) t).getTargetException();
 		}
 		// skip inner InvocationTargetExceptions and BundleExceptions
 		if (root instanceof InvocationTargetException || root instanceof BundleException) {
 			Throwable deeplyNested = getRoot(root);
 			if (deeplyNested != null) {
 				// if we have something more specific, use it, otherwise keep what we have
 				root = deeplyNested;
 			}
 		}
 		return root;
 	}

 	/**
 	 * Helper method for writing out argument arrays.
 	 *
 	 * @param header
 	 *            the header
 	 * @param args
 	 *            the list of arguments
 	 */
 	protected void writeArgs(String header, String[] args) throws IOException {
 		if (args == null || args.length == 0) {
 			return;
 		}
 		write(header);
 		for (int i = 0; i < args.length; i++) {
 			// mask out the password argument for security
 			if (i > 0 && PASSWORD.equals(args[i - 1])) {
 				write(" (omitted)"); //$NON-NLS-1$
 			} else {
 				write(" " + args[i]); //$NON-NLS-1$
 			}
 		}
 		writeln();
 	}

 	/**
 	 * Returns the session timestamp. This is the time the platform was started
 	 *
 	 * @return the session timestamp
 	 */
 	protected String getSessionTimestamp() {
 		// Main should have set the session start-up timestamp so return that.
 		// Return the "now" time if not available.
 		String ts = getProperty("eclipse.startTime"); //$NON-NLS-1$
 		if (ts != null) {
 			try {
 				return getDate(new Date(Long.parseLong(ts)));
 			} catch (NumberFormatException e) {
 				// fall through and use the timestamp from right now
 			}
 		}
 		return getDate(new Date());
 	}

 	/**
 	 * Writes the session
 	 *
 	 * @throws IOException
 	 *             if an error occurs writing to the log
 	 */

 	@Override
 	public void close() {
 		try {
 			if (writer != null) {
 				Writer tmpWriter = writer;
 				writer = null;
 				tmpWriter.close();
 			}
 		} catch (IOException e) {
 			e.printStackTrace();
 		}
 	}

 	/**
 	 * If a File is used to log messages to then the File opened and a Writer is created to log messages to.
 	 */
 	protected void openFile() {
 		if (writer == null) {
 			if (outFile != null) {
 				try {
 					writer = logForStream(new FileOutputStream(outFile, true));
 				} catch (IOException e) {
 					writer = logForStream(System.err);
 				}
 			} else {
 				writer = logForStream(System.err);
 			}
 		}
 	}

 	/**
 	 * If a File is used to log messages to then the writer is closed.
 	 */
 	protected void closeFile() {
 		if (outFile != null) {
 			if (writer != null) {
 				try {
 					writer.close();
 				} catch (IOException e) {
 					// we cannot log here; just print the stacktrace.
 					e.printStackTrace();
 				}
 				writer = null;
 			}
 		}
 	}

 	@Override
 	public void log(FrameworkEvent frameworkEvent) {
 		Bundle b = frameworkEvent.getBundle();
 		Throwable t = frameworkEvent.getThrowable();
 		String entry = b.getSymbolicName() == null ? b.getLocation() : b.getSymbolicName();
 		int severity;
 		switch (frameworkEvent.getType()) {
 		case FrameworkEvent.INFO:
 			severity = FrameworkLogEntry.INFO;
 			break;
 		case FrameworkEvent.ERROR:
 			severity = FrameworkLogEntry.ERROR;
 			break;
 		case FrameworkEvent.WARNING:
 			severity = FrameworkLogEntry.WARNING;
 			break;
 		default:
 			severity = FrameworkLogEntry.OK;
 		}
 		FrameworkLogEntry logEntry = new FrameworkLogEntry(entry, severity, 0, "", 0, t, null); //$NON-NLS-1$
 		log(logEntry);
 	}

 	@Override
 	public synchronized void log(FrameworkLogEntry logEntry) {
 		if (logEntry == null) {
 			return;
 		}
 		if (!isLoggable(logEntry)) {
 			return;
 		}
 		try {
 			checkLogFileSize();
 			openFile();
 			if (newSession) {

 				newSession = false;
 			}
 			writeLog(0, logEntry);
 			writer.flush();
 		} catch (Exception e) {
 			// any exceptions during logging should be caught
 			PlatformLogUtil.logAsError(ResourcesPlugin.getPlugin(), e);
 			// we failed to write, so dump log entry to console instead
 			try {
 				writer = logForStream(System.err);
 				writeLog(0, logEntry);
 				writer.flush();
 			} catch (Exception e2) {
 				PlatformLogUtil.logAsError(ResourcesPlugin.getPlugin(), e);
 			}
 		} finally {
 			closeFile();
 		}
 	}

 	@Override
 	public synchronized void setWriter(Writer newWriter, boolean append) {
 		setOutput(null, newWriter, append);
 	}

 	@Override
 	public synchronized void setFile(File newFile, boolean append) throws IOException {
 		if (newFile != null && !newFile.equals(outFile)) {
 			// If it's a new file, then reset.
 			readLogProperties();
 			backupIdx = 0;
 		}
 		setOutput(newFile, null, append);
 		setProperty(PROP_LOGFILE, newFile.getAbsolutePath());
 	}

 	@Override
 	public synchronized File getFile() {
 		return outFile;
 	}

 	@Override
 	public void setConsoleLog(boolean consoleLog) {
 		this.consoleLog = consoleLog;
 	}

 	private void setOutput(File newOutFile, Writer newWriter, boolean append) {
 		if (newOutFile == null || !newOutFile.equals(outFile)) {
 			if (writer != null) {
 				try {
 					writer.close();
 				} catch (IOException e) {
 					e.printStackTrace();
 				}
 				writer = null;
 			}
 			// Append old outFile to newWriter. We only attempt to do this
 			// if the current Writer is backed by a File and this is not
 			// a new session.
 			File oldOutFile = outFile;
 			outFile = newOutFile;
 			writer = newWriter;
 			boolean copyFailed = false;
 			if (append && oldOutFile != null && oldOutFile.isFile()) {
 				Reader fileIn = null;
 				try {
 					openFile();
 					fileIn = new InputStreamReader(new FileInputStream(oldOutFile), "UTF-8"); //$NON-NLS-1$
 					copyReader(fileIn, writer);
 				} catch (IOException e) {
 					copyFailed = true;
 					e.printStackTrace();
 				} finally {
 					if (fileIn != null) {
 						try {
 							fileIn.close();
 						} catch (IOException e) {
 							e.printStackTrace();
 						}
 						// delete the old file if copying didn't fail
 						if (!copyFailed) {
 							oldOutFile.delete();
 						}
 					}
 					closeFile();
 				}
 			}
 		}
 	}

 	private void copyReader(Reader reader, Writer aWriter) throws IOException {
 		char buffer[] = new char[1024];
 		int count;
 		while ((count = reader.read(buffer, 0, buffer.length)) > 0) {
 			aWriter.write(buffer, 0, count);
 		}
 	}

 	/**
 	 * Returns a date string using the correct format for the log.
 	 *
 	 * @param date
 	 *            the Date to format
 	 * @return a date string.
 	 */
 	protected String getDate(Date date) {
 		Calendar c = Calendar.getInstance();
 		c.setTime(date);
 		StringBuffer sb = new StringBuffer();
 		appendPaddedInt(c.get(Calendar.YEAR), 4, sb).append('-');
 		appendPaddedInt(c.get(Calendar.MONTH) + 1, 2, sb).append('-');
 		appendPaddedInt(c.get(Calendar.DAY_OF_MONTH), 2, sb).append(' ');
 		appendPaddedInt(c.get(Calendar.HOUR_OF_DAY), 2, sb).append(':');
 		appendPaddedInt(c.get(Calendar.MINUTE), 2, sb).append(':');
 		appendPaddedInt(c.get(Calendar.SECOND), 2, sb).append('.');
 		appendPaddedInt(c.get(Calendar.MILLISECOND), 3, sb);
 		return sb.toString();
 	}

 	private StringBuffer appendPaddedInt(int value, int pad, StringBuffer buffer) {
 		pad = pad - 1;
 		if (pad == 0) {
 			return buffer.append(Integer.toString(value));
 		}
 		int padding = (int) Math.pow(10, pad);
 		if (value >= padding) {
 			return buffer.append(Integer.toString(value));
 		}
 		while (padding > value && padding > 1) {
 			buffer.append('0');
 			padding = padding / 10;
 		}
 		buffer.append(value);
 		return buffer;
 	}

 	/**
 	 * Returns a stacktrace string using the correct format for the log
 	 *
 	 * @param t
 	 *            the Throwable to get the stacktrace for
 	 * @return a stacktrace string
 	 */
 	protected String getStackTrace(Throwable t) {
 		if (t == null) {
 			return null;
 		}

 		StringWriter sw = new StringWriter();
 		PrintWriter pw = new PrintWriter(sw);

 		t.printStackTrace(pw);
 		// ensure the root exception is fully logged
 		Throwable root = getRoot(t);
 		if (root != null) {
 			pw.println("Root exception:"); //$NON-NLS-1$
 			root.printStackTrace(pw);
 		}
 		return sw.toString();
 	}

 	/**
 	 * Returns a Writer for the given OutputStream
 	 *
 	 * @param output
 	 *            an OutputStream to use for the Writer
 	 * @return a Writer for the given OutputStream
 	 */
 	protected Writer logForStream(OutputStream output) {
 		try {
 			return new BufferedWriter(new OutputStreamWriter(output, "UTF-8")); //$NON-NLS-1$
 		} catch (UnsupportedEncodingException e) {
 			return new BufferedWriter(new OutputStreamWriter(output));
 		}
 	}

 	/**
 	 * Writes the log entry to the log using the specified depth. A depth value of 0 idicates that the log entry is the
 	 * root entry. Any value greater than 0 indicates a sub-entry.
 	 *
 	 * @param depth
 	 *            the depth of th entry
 	 * @param entry
 	 *            the entry to log
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void writeLog(int depth, FrameworkLogEntry entry) throws IOException {
 		writeEntry(depth, entry);
 		writeMessage(entry);
 		writeStack(entry);

 		FrameworkLogEntry[] children = entry.getChildren();
 		if (children != null) {
 			for (FrameworkLogEntry element : children) {
 				writeLog(depth + 1, element);
 			}
 		}
 	}

 	/**
 	 * Writes the ENTRY or SUBENTRY header for an entry. A depth value of 0 indicates that the log entry is the root
 	 * entry. Any value greater than 0 indicates a sub-entry.
 	 *
 	 * @param depth
 	 *            the depth of th entry
 	 * @param entry
 	 *            the entry to write the header for
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void writeEntry(int depth, FrameworkLogEntry entry) throws IOException {
 		if (depth == 0) {
 			writeln(); // write a blank line before all !ENTRY tags bug #64406
 			write(ENTRY);
 		} else {
 			write(SUBENTRY);
 			writeSpace();
 			write(Integer.toString(depth));
 		}
 		writeSpace();
 		write(entry.getEntry());
 		writeSpace();
 		write(Integer.toString(entry.getSeverity()));
 		writeSpace();
 		write(Integer.toString(entry.getBundleCode()));
 		writeSpace();
 		write(getDate(new Date()));
 		writeln();
 	}

 	/**
 	 * Writes the MESSAGE header to the log for the given entry.
 	 *
 	 * @param entry
 	 *            the entry to write the message for
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void writeMessage(FrameworkLogEntry entry) throws IOException {
 		write(MESSAGE);
 		writeSpace();
 		writeln(entry.getMessage());
 	}

 	/**
 	 * Writes the STACK header to the log for the given entry.
 	 *
 	 * @param entry
 	 *            the entry to write the stacktrace for
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void writeStack(FrameworkLogEntry entry) throws IOException {
 		Throwable t = entry.getThrowable();
 		if (t != null) {
 			String stack = getStackTrace(t);
 			write(STACK);
 			writeSpace();
 			write(Integer.toString(entry.getStackCode()));
 			writeln();
 			write(stack);
 		}
 	}

 	/**
 	 * Writes the given message to the log.
 	 *
 	 * @param message
 	 *            the message
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void write(String message) throws IOException {
 		if (message != null) {
 			writer.write(message);
 			if (consoleLog) {
 				System.out.print(message);
 			}
 		}
 	}

 	/**
 	 * Writes the given message to the log and a newline.
 	 *
 	 * @param s
 	 *            the message
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void writeln(String s) throws IOException {
 		write(s);
 		writeln();
 	}

 	/**
 	 * Writes a newline log.
 	 *
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void writeln() throws IOException {
 		write(LINE_SEPARATOR);
 	}

 	/**
 	 * Writes a space to the log.
 	 *
 	 * @throws IOException
 	 *             if any error occurs writing to the log
 	 */
 	protected void writeSpace() throws IOException {
 		write(" "); //$NON-NLS-1$
 	}

 	/**
 	 * Checks the log file size. If the log file size reaches the limit then the log is rotated
 	 *
 	 * @return false if an error occured trying to rotate the log
 	 */
 	protected boolean checkLogFileSize() {
 		if (maxLogSize == 0) {
 			return true; // no size limitation.
 		}

 		boolean isBackupOK = true;
 		if (outFile != null) {
 			if (outFile.length() >> 10 > maxLogSize) { // Use KB as file size unit.
 				String logFilename = outFile.getAbsolutePath();

 				// Delete old backup file that will be replaced.
 				String backupFilename = ""; //$NON-NLS-1$
 				if (logFilename.toLowerCase().endsWith(LOG_EXT)) {
 					backupFilename = logFilename.substring(0, logFilename.length() - LOG_EXT.length()) + BACKUP_MARK + backupIdx + LOG_EXT;
 				} else {
 					backupFilename = logFilename + BACKUP_MARK + backupIdx;
 				}
 				File backupFile = new File(backupFilename);
 				if (backupFile.exists()) {
 					if (!backupFile.delete()) {
 						if (backupFile.renameTo(new File(backupFile.getAbsolutePath() + System.currentTimeMillis()))) {
 						} else {
 							isBackupOK = false;
 						}
 					}
 				}

 				// Rename current log file to backup one.
 				boolean isRenameOK = outFile.renameTo(backupFile);
 				if (!isRenameOK) {
 					isBackupOK = false;
 				}
 				File newFile = new File(logFilename);
 				setOutput(newFile, null, false);

 				// Write a new SESSION header to new log file.
 				openFile();
 				try {

 					writeln();
 					writeln("This is a continuation of log file " + backupFile.getAbsolutePath());//$NON-NLS-1$
 					writeln("Created Time: " + getDate(new Date(System.currentTimeMillis()))); //$NON-NLS-1$
 					writer.flush();
 				} catch (IOException ioe) {
 					PlatformLogUtil.logAsError(ResourcesPlugin.getPlugin(), ioe);
 				}
 				closeFile();
 				backupIdx = ++backupIdx % maxLogFiles;
 			}
 		}
 		return isBackupOK;
 	}

 	/**
 	 * Reads the PROP_LOG_SIZE_MAX and PROP_LOG_FILE_MAX properties.
 	 */
 	public static String getProperty(String key) {
 		SecurityManager sm = System.getSecurityManager();
 		if (sm != null) {
 			sm.checkPropertyAccess(key);
 		}
 		return properties.getProperty(key, null);
 	}

 	public static String setProperty(String key, String value) {
 		SecurityManager sm = System.getSecurityManager();
 		if (sm != null) {
 			sm.checkPermission(new PropertyPermission(key, "write")); //$NON-NLS-1$
 		}
 		return (String) properties.put(key, value);
 	}

 	protected void readLogProperties() {
 		String newMaxLogSize = getProperty(PROP_LOG_SIZE_MAX);
 		if (newMaxLogSize != null) {
 			maxLogSize = Integer.parseInt(newMaxLogSize);
 			if (maxLogSize != 0 && maxLogSize < LOG_SIZE_MIN) {
 				// If the value is '0', then it means no size limitation.
 				// Also, make sure no inappropriate(too small) assigned value.
 				maxLogSize = LOG_SIZE_MIN;
 			}
 		}

 		String newMaxLogFiles = getProperty(PROP_LOG_FILE_MAX);
 		if (newMaxLogFiles != null) {
 			maxLogFiles = Integer.parseInt(newMaxLogFiles);
 			if (maxLogFiles < 1) {
 				// Make sure no invalid assigned value. (at least >= 1)
 				maxLogFiles = DEFAULT_LOG_FILES;
 			}
 		}

 		String newLogLevel = getProperty(PROP_LOG_LEVEL);
 		if (newLogLevel != null) {
 			if (newLogLevel.equals("ERROR")) { //$NON-NLS-1$
 				logLevel = FrameworkLogEntry.ERROR;
 			} else if (newLogLevel.equals("WARNING")) { //$NON-NLS-1$
 				logLevel = FrameworkLogEntry.ERROR | FrameworkLogEntry.WARNING;
 			} else if (newLogLevel.equals("INFO")) { //$NON-NLS-1$
 				logLevel = FrameworkLogEntry.INFO | FrameworkLogEntry.ERROR | FrameworkLogEntry.WARNING | FrameworkLogEntry.CANCEL;
 			} else {
 				logLevel = FrameworkLogEntry.OK; // OK (0) means log everything
 			}
 		}
 	}

 	/**
 	 * Determines if the log entry should be logged based on log level.
 	 */
 	private boolean isLoggable(FrameworkLogEntry entry) {
 		if (logLevel == 0) {
 			return true;
 		}
 		return (entry.getSeverity() & logLevel) != 0;
 	}
 }
	/**
	* <copyright>
	*
	* Copyright (c) 2008-2010 See4sys and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
	*
	* Contributors:
	* See4sys - Initial API and implementation
	*
	* </copyright>
	*/
	package org.eclipse.sphinx.platform.stats;

	import java.io.BufferedWriter;
	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.OutputStream;
	import java.io.OutputStreamWriter;
	import java.io.PrintWriter;
	import java.io.Reader;
	import java.io.StringWriter;
	import java.io.UnsupportedEncodingException;
	import java.io.Writer;
	import java.lang.reflect.InvocationTargetException;
	import java.util.Calendar;
	import java.util.Date;
	import java.util.Properties;
	import java.util.PropertyPermission;

	import org.eclipse.core.resources.ResourcesPlugin;
	import org.eclipse.osgi.framework.log.FrameworkLog;
	import org.eclipse.osgi.framework.log.FrameworkLogEntry;
	import org.eclipse.sphinx.platform.util.PlatformLogUtil;
	import org.osgi.framework.Bundle;
	import org.osgi.framework.BundleException;
	import org.osgi.framework.FrameworkEvent;

	/**
	* The FrameworkLog implementation for Eclipse.
	* <p>
	* Clients may extend this class.
	* </p>
	*
	* @since 0.7.0
	*/
	public class PerformanceStatsLog implements FrameworkLog {

	private static final String PASSWORD = "-password"; //$NON-NLS-1$
	/** The session tag */
	protected static final String SESSION = "!SESSION"; //$NON-NLS-1$
	/** The entry tag */
	protected static final String ENTRY = "!ENTRY"; //$NON-NLS-1$
	/** The sub-entry tag */
	protected static final String SUBENTRY = "!SUBENTRY"; //$NON-NLS-1$
	/** The message tag */
	protected static final String MESSAGE = "!MESSAGE"; //$NON-NLS-1$
	/** The stacktrace tag */
	protected static final String STACK = "!STACK"; //$NON-NLS-1$

	/** The line separator used in the log output */
	protected static final String LINE_SEPARATOR;
	/** The tab character used in the log output */
	protected static final String TAB_STRING = "\t"; //$NON-NLS-1$
	private static final String USING_SYSTEM_PROPERTIES_KEY = "osgi.framework.useSystemProperties";//$NON-NLS-1$
	// Constants for rotating log file
	/** The default size a log file can grow before it is rotated */
	public static final int DEFAULT_LOG_SIZE = 1000000;
	/** The default number of backup log files */
	public static final int DEFAULT_LOG_FILES = 10;
	/** The minimum size limit for log rotation */
	public static final int LOG_SIZE_MIN = 1000000;

	/** The system property used to specify the log level */
	public static final String PROP_LOG_LEVEL = "eclipse.log.level"; //$NON-NLS-1$
	/** The system property used to specify size a log file can grow before it is rotated */
	public static final String PROP_LOG_SIZE_MAX = "eclipse.log.size.max"; //$NON-NLS-1$
	/** The system property used to specify the maximum number of backup log files to use */
	public static final String PROP_LOG_FILE_MAX = "eclipse.log.backup.max"; //$NON-NLS-1$
	/** The extension used for log files */
	public static final String LOG_EXT = ".log"; //$NON-NLS-1$
	/** The extension markup to use for backup log files */
	public static final String BACKUP_MARK = ".bak_"; //$NON-NLS-1$
	private static Properties properties;
	public static final String PROP_LOGFILE = "osgi.logfile"; //$NON-NLS-1$
	/** Indicates if the console messages should be printed to the console (System.out) */
	protected boolean consoleLog = false;
	/** Indicates if the next log message is part of a new session */
	protected boolean newSession = true;
	/**
	* The File object to store messages. This value may be null.
	*/
	protected File outFile;

	/**
	* The Writer to log messages to.
	*/
	protected Writer writer;

	int maxLogSize = DEFAULT_LOG_SIZE; // The value is in KB.
	int maxLogFiles = DEFAULT_LOG_FILES;
	int backupIdx = 0;

	private int logLevel = FrameworkLogEntry.OK;

	/**
	* Constructs an EclipseLog which uses the specified File to log messages to
	*
	* @param outFile
	* a file to log messages to
	*/
	static {
	String s = System.getProperty("line.separator"); //$NON-NLS-1$
	LINE_SEPARATOR = s == null ? "\n" : s; //$NON-NLS-1$
	Properties systemProperties = System.getProperties();
	String usingSystemProperties = systemProperties.getProperty(USING_SYSTEM_PROPERTIES_KEY);

	if (usingSystemProperties == null \|\| usingSystemProperties.equalsIgnoreCase(Boolean.TRUE.toString())) {
	properties = systemProperties;
	} else {
	// use systemProperties for a snapshot
	// also see requirements in Bundlecontext.getProperty(...))
	properties = new Properties();
	// snapshot of System properties for uses of getProperties who expect to see framework properties set as
	// System properties
	// we need to do this for all system properties because the properties object is used to back
	// BundleContext#getProperty method which expects all system properties to be available
	properties.putAll(systemProperties);
	}
	}

	public PerformanceStatsLog(File outFile) {
	this.outFile = outFile;
	writer = null;
	readLogProperties();
	}

	/**
	* Constructs an EclipseLog which uses the specified Writer to log messages to
	*
	* @param writer
	* a writer to log messages to
	*/
	public PerformanceStatsLog(Writer writer) {
	if (writer == null) {
	// log to System.err by default
	this.writer = logForStream(System.err);
	} else {
	this.writer = writer;
	}
	}

	private Throwable getRoot(Throwable t) {
	Throwable root = null;
	if (t instanceof BundleException) {
	root = ((BundleException) t).getNestedException();
	}
	if (t instanceof InvocationTargetException) {
	root = ((InvocationTargetException) t).getTargetException();
	}
	// skip inner InvocationTargetExceptions and BundleExceptions
	if (root instanceof InvocationTargetException \|\| root instanceof BundleException) {
	Throwable deeplyNested = getRoot(root);
	if (deeplyNested != null) {
	// if we have something more specific, use it, otherwise keep what we have
	root = deeplyNested;
	}
	}
	return root;
	}

	/**
	* Helper method for writing out argument arrays.
	*
	* @param header
	* the header
	* @param args
	* the list of arguments
	*/
	protected void writeArgs(String header, String[] args) throws IOException {
	if (args == null \|\| args.length == 0) {
	return;
	}
	write(header);
	for (int i = 0; i < args.length; i++) {
	// mask out the password argument for security
	if (i > 0 && PASSWORD.equals(args[i - 1])) {
	write(" (omitted)"); //$NON-NLS-1$
	} else {
	write(" " + args[i]); //$NON-NLS-1$
	}
	}
	writeln();
	}

	/**
	* Returns the session timestamp. This is the time the platform was started
	*
	* @return the session timestamp
	*/
	protected String getSessionTimestamp() {
	// Main should have set the session start-up timestamp so return that.
	// Return the "now" time if not available.
	String ts = getProperty("eclipse.startTime"); //$NON-NLS-1$
	if (ts != null) {
	try {
	return getDate(new Date(Long.parseLong(ts)));
	} catch (NumberFormatException e) {
	// fall through and use the timestamp from right now
	}
	}
	return getDate(new Date());
	}

	/**
	* Writes the session
	*
	* @throws IOException
	* if an error occurs writing to the log
	*/

	@Override
	public void close() {
	try {
	if (writer != null) {
	Writer tmpWriter = writer;
	writer = null;
	tmpWriter.close();
	}
	} catch (IOException e) {
	e.printStackTrace();
	}
	}

	/**
	* If a File is used to log messages to then the File opened and a Writer is created to log messages to.
	*/
	protected void openFile() {
	if (writer == null) {
	if (outFile != null) {
	try {
	writer = logForStream(new FileOutputStream(outFile, true));
	} catch (IOException e) {
	writer = logForStream(System.err);
	}
	} else {
	writer = logForStream(System.err);
	}
	}
	}

	/**
	* If a File is used to log messages to then the writer is closed.
	*/
	protected void closeFile() {
	if (outFile != null) {
	if (writer != null) {
	try {
	writer.close();
	} catch (IOException e) {
	// we cannot log here; just print the stacktrace.
	e.printStackTrace();
	}
	writer = null;
	}
	}
	}

	@Override
	public void log(FrameworkEvent frameworkEvent) {
	Bundle b = frameworkEvent.getBundle();
	Throwable t = frameworkEvent.getThrowable();
	String entry = b.getSymbolicName() == null ? b.getLocation() : b.getSymbolicName();
	int severity;
	switch (frameworkEvent.getType()) {
	case FrameworkEvent.INFO:
	severity = FrameworkLogEntry.INFO;
	break;
	case FrameworkEvent.ERROR:
	severity = FrameworkLogEntry.ERROR;
	break;
	case FrameworkEvent.WARNING:
	severity = FrameworkLogEntry.WARNING;
	break;
	default:
	severity = FrameworkLogEntry.OK;
	}
	FrameworkLogEntry logEntry = new FrameworkLogEntry(entry, severity, 0, "", 0, t, null); //$NON-NLS-1$
	log(logEntry);
	}

	@Override
	public synchronized void log(FrameworkLogEntry logEntry) {
	if (logEntry == null) {
	return;
	}
	if (!isLoggable(logEntry)) {
	return;
	}
	try {
	checkLogFileSize();
	openFile();
	if (newSession) {

	newSession = false;
	}
	writeLog(0, logEntry);
	writer.flush();
	} catch (Exception e) {
	// any exceptions during logging should be caught
	PlatformLogUtil.logAsError(ResourcesPlugin.getPlugin(), e);
	// we failed to write, so dump log entry to console instead
	try {
	writer = logForStream(System.err);
	writeLog(0, logEntry);
	writer.flush();
	} catch (Exception e2) {
	PlatformLogUtil.logAsError(ResourcesPlugin.getPlugin(), e);
	}
	} finally {
	closeFile();
	}
	}

	@Override
	public synchronized void setWriter(Writer newWriter, boolean append) {
	setOutput(null, newWriter, append);
	}

	@Override
	public synchronized void setFile(File newFile, boolean append) throws IOException {
	if (newFile != null && !newFile.equals(outFile)) {
	// If it's a new file, then reset.
	readLogProperties();
	backupIdx = 0;
	}
	setOutput(newFile, null, append);
	setProperty(PROP_LOGFILE, newFile.getAbsolutePath());
	}

	@Override
	public synchronized File getFile() {
	return outFile;
	}

	@Override
	public void setConsoleLog(boolean consoleLog) {
	this.consoleLog = consoleLog;
	}

	private void setOutput(File newOutFile, Writer newWriter, boolean append) {
	if (newOutFile == null \|\| !newOutFile.equals(outFile)) {
	if (writer != null) {
	try {
	writer.close();
	} catch (IOException e) {
	e.printStackTrace();
	}
	writer = null;
	}
	// Append old outFile to newWriter. We only attempt to do this
	// if the current Writer is backed by a File and this is not
	// a new session.
	File oldOutFile = outFile;
	outFile = newOutFile;
	writer = newWriter;
	boolean copyFailed = false;
	if (append && oldOutFile != null && oldOutFile.isFile()) {
	Reader fileIn = null;
	try {
	openFile();
	fileIn = new InputStreamReader(new FileInputStream(oldOutFile), "UTF-8"); //$NON-NLS-1$
	copyReader(fileIn, writer);
	} catch (IOException e) {
	copyFailed = true;
	e.printStackTrace();
	} finally {
	if (fileIn != null) {
	try {
	fileIn.close();
	} catch (IOException e) {
	e.printStackTrace();
	}
	// delete the old file if copying didn't fail
	if (!copyFailed) {
	oldOutFile.delete();
	}
	}
	closeFile();
	}
	}
	}
	}

	private void copyReader(Reader reader, Writer aWriter) throws IOException {
	char buffer[] = new char[1024];
	int count;
	while ((count = reader.read(buffer, 0, buffer.length)) > 0) {
	aWriter.write(buffer, 0, count);
	}
	}

	/**
	* Returns a date string using the correct format for the log.
	*
	* @param date
	* the Date to format
	* @return a date string.
	*/
	protected String getDate(Date date) {
	Calendar c = Calendar.getInstance();
	c.setTime(date);
	StringBuffer sb = new StringBuffer();
	appendPaddedInt(c.get(Calendar.YEAR), 4, sb).append('-');
	appendPaddedInt(c.get(Calendar.MONTH) + 1, 2, sb).append('-');
	appendPaddedInt(c.get(Calendar.DAY_OF_MONTH), 2, sb).append(' ');
	appendPaddedInt(c.get(Calendar.HOUR_OF_DAY), 2, sb).append(':');
	appendPaddedInt(c.get(Calendar.MINUTE), 2, sb).append(':');
	appendPaddedInt(c.get(Calendar.SECOND), 2, sb).append('.');
	appendPaddedInt(c.get(Calendar.MILLISECOND), 3, sb);
	return sb.toString();
	}

	private StringBuffer appendPaddedInt(int value, int pad, StringBuffer buffer) {
	pad = pad - 1;
	if (pad == 0) {
	return buffer.append(Integer.toString(value));
	}
	int padding = (int) Math.pow(10, pad);
	if (value >= padding) {
	return buffer.append(Integer.toString(value));
	}
	while (padding > value && padding > 1) {
	buffer.append('0');
	padding = padding / 10;
	}
	buffer.append(value);
	return buffer;
	}

	/**
	* Returns a stacktrace string using the correct format for the log
	*
	* @param t
	* the Throwable to get the stacktrace for
	* @return a stacktrace string
	*/
	protected String getStackTrace(Throwable t) {
	if (t == null) {
	return null;
	}

	StringWriter sw = new StringWriter();
	PrintWriter pw = new PrintWriter(sw);

	t.printStackTrace(pw);
	// ensure the root exception is fully logged
	Throwable root = getRoot(t);
	if (root != null) {
	pw.println("Root exception:"); //$NON-NLS-1$
	root.printStackTrace(pw);
	}
	return sw.toString();
	}

	/**
	* Returns a Writer for the given OutputStream
	*
	* @param output
	* an OutputStream to use for the Writer
	* @return a Writer for the given OutputStream
	*/
	protected Writer logForStream(OutputStream output) {
	try {
	return new BufferedWriter(new OutputStreamWriter(output, "UTF-8")); //$NON-NLS-1$
	} catch (UnsupportedEncodingException e) {
	return new BufferedWriter(new OutputStreamWriter(output));
	}
	}

	/**
	* Writes the log entry to the log using the specified depth. A depth value of 0 idicates that the log entry is the
	* root entry. Any value greater than 0 indicates a sub-entry.
	*
	* @param depth
	* the depth of th entry
	* @param entry
	* the entry to log
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void writeLog(int depth, FrameworkLogEntry entry) throws IOException {
	writeEntry(depth, entry);
	writeMessage(entry);
	writeStack(entry);

	FrameworkLogEntry[] children = entry.getChildren();
	if (children != null) {
	for (FrameworkLogEntry element : children) {
	writeLog(depth + 1, element);
	}
	}
	}

	/**
	* Writes the ENTRY or SUBENTRY header for an entry. A depth value of 0 indicates that the log entry is the root
	* entry. Any value greater than 0 indicates a sub-entry.
	*
	* @param depth
	* the depth of th entry
	* @param entry
	* the entry to write the header for
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void writeEntry(int depth, FrameworkLogEntry entry) throws IOException {
	if (depth == 0) {
	writeln(); // write a blank line before all !ENTRY tags bug #64406
	write(ENTRY);
	} else {
	write(SUBENTRY);
	writeSpace();
	write(Integer.toString(depth));
	}
	writeSpace();
	write(entry.getEntry());
	writeSpace();
	write(Integer.toString(entry.getSeverity()));
	writeSpace();
	write(Integer.toString(entry.getBundleCode()));
	writeSpace();
	write(getDate(new Date()));
	writeln();
	}

	/**
	* Writes the MESSAGE header to the log for the given entry.
	*
	* @param entry
	* the entry to write the message for
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void writeMessage(FrameworkLogEntry entry) throws IOException {
	write(MESSAGE);
	writeSpace();
	writeln(entry.getMessage());
	}

	/**
	* Writes the STACK header to the log for the given entry.
	*
	* @param entry
	* the entry to write the stacktrace for
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void writeStack(FrameworkLogEntry entry) throws IOException {
	Throwable t = entry.getThrowable();
	if (t != null) {
	String stack = getStackTrace(t);
	write(STACK);
	writeSpace();
	write(Integer.toString(entry.getStackCode()));
	writeln();
	write(stack);
	}
	}

	/**
	* Writes the given message to the log.
	*
	* @param message
	* the message
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void write(String message) throws IOException {
	if (message != null) {
	writer.write(message);
	if (consoleLog) {
	System.out.print(message);
	}
	}
	}

	/**
	* Writes the given message to the log and a newline.
	*
	* @param s
	* the message
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void writeln(String s) throws IOException {
	write(s);
	writeln();
	}

	/**
	* Writes a newline log.
	*
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void writeln() throws IOException {
	write(LINE_SEPARATOR);
	}

	/**
	* Writes a space to the log.
	*
	* @throws IOException
	* if any error occurs writing to the log
	*/
	protected void writeSpace() throws IOException {
	write(" "); //$NON-NLS-1$
	}

	/**
	* Checks the log file size. If the log file size reaches the limit then the log is rotated
	*
	* @return false if an error occured trying to rotate the log
	*/
	protected boolean checkLogFileSize() {
	if (maxLogSize == 0) {
	return true; // no size limitation.
	}

	boolean isBackupOK = true;
	if (outFile != null) {
	if (outFile.length() >> 10 > maxLogSize) { // Use KB as file size unit.
	String logFilename = outFile.getAbsolutePath();

	// Delete old backup file that will be replaced.
	String backupFilename = ""; //$NON-NLS-1$
	if (logFilename.toLowerCase().endsWith(LOG_EXT)) {
	backupFilename = logFilename.substring(0, logFilename.length() - LOG_EXT.length()) + BACKUP_MARK + backupIdx + LOG_EXT;
	} else {
	backupFilename = logFilename + BACKUP_MARK + backupIdx;
	}
	File backupFile = new File(backupFilename);
	if (backupFile.exists()) {
	if (!backupFile.delete()) {
	if (backupFile.renameTo(new File(backupFile.getAbsolutePath() + System.currentTimeMillis()))) {
	} else {
	isBackupOK = false;
	}
	}
	}

	// Rename current log file to backup one.
	boolean isRenameOK = outFile.renameTo(backupFile);
	if (!isRenameOK) {
	isBackupOK = false;
	}
	File newFile = new File(logFilename);
	setOutput(newFile, null, false);

	// Write a new SESSION header to new log file.
	openFile();
	try {

	writeln();
	writeln("This is a continuation of log file " + backupFile.getAbsolutePath());//$NON-NLS-1$
	writeln("Created Time: " + getDate(new Date(System.currentTimeMillis()))); //$NON-NLS-1$
	writer.flush();
	} catch (IOException ioe) {
	PlatformLogUtil.logAsError(ResourcesPlugin.getPlugin(), ioe);
	}
	closeFile();
	backupIdx = ++backupIdx % maxLogFiles;
	}
	}
	return isBackupOK;
	}

	/**
	* Reads the PROP_LOG_SIZE_MAX and PROP_LOG_FILE_MAX properties.
	*/
	public static String getProperty(String key) {
	SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	sm.checkPropertyAccess(key);
	}
	return properties.getProperty(key, null);
	}

	public static String setProperty(String key, String value) {
	SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	sm.checkPermission(new PropertyPermission(key, "write")); //$NON-NLS-1$
	}
	return (String) properties.put(key, value);
	}

	protected void readLogProperties() {
	String newMaxLogSize = getProperty(PROP_LOG_SIZE_MAX);
	if (newMaxLogSize != null) {
	maxLogSize = Integer.parseInt(newMaxLogSize);
	if (maxLogSize != 0 && maxLogSize < LOG_SIZE_MIN) {
	// If the value is '0', then it means no size limitation.
	// Also, make sure no inappropriate(too small) assigned value.
	maxLogSize = LOG_SIZE_MIN;
	}
	}

	String newMaxLogFiles = getProperty(PROP_LOG_FILE_MAX);
	if (newMaxLogFiles != null) {
	maxLogFiles = Integer.parseInt(newMaxLogFiles);
	if (maxLogFiles < 1) {
	// Make sure no invalid assigned value. (at least >= 1)
	maxLogFiles = DEFAULT_LOG_FILES;
	}
	}

	String newLogLevel = getProperty(PROP_LOG_LEVEL);
	if (newLogLevel != null) {
	if (newLogLevel.equals("ERROR")) { //$NON-NLS-1$
	logLevel = FrameworkLogEntry.ERROR;
	} else if (newLogLevel.equals("WARNING")) { //$NON-NLS-1$
	logLevel = FrameworkLogEntry.ERROR \| FrameworkLogEntry.WARNING;
	} else if (newLogLevel.equals("INFO")) { //$NON-NLS-1$
	logLevel = FrameworkLogEntry.INFO \| FrameworkLogEntry.ERROR \| FrameworkLogEntry.WARNING \| FrameworkLogEntry.CANCEL;
	} else {
	logLevel = FrameworkLogEntry.OK; // OK (0) means log everything
	}
	}
	}

	/**
	* Determines if the log entry should be logged based on log level.
	*/
	private boolean isLoggable(FrameworkLogEntry entry) {
	if (logLevel == 0) {
	return true;
	}
	return (entry.getSeverity() & logLevel) != 0;
	}
	}