//GuiHandler.java
//-------------------------------------
//part of YACY
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2004
//
//This file is contributed by Martin Thelian
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.kelondro.logging;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.ErrorManager;
import java.util.logging.Filter;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.SimpleFormatter;
import net.yacy.kelondro.util.MemoryControl;
public class GuiHandler extends Handler {
private final static int DEFAULT_SIZE = 1000; // don't make this too big, it eats up a lot of memory!
private static int size = DEFAULT_SIZE;
private static String buffer[];
private static int start, count;
public GuiHandler() {
super();
final LogManager manager = LogManager.getLogManager();
final String className = getClass().getName();
final String level = manager.getProperty(className + ".level");
setLevel((level == null) ? Level.INFO : Level.parse(level));
setFilter(makeFilter(manager.getProperty(className + ".filter")));
setFormatter(makeFormatter(manager.getProperty(className + ".formatter")));
try {
GuiHandler.size = Integer.parseInt(manager.getProperty(className + ".size"));
} catch (final NumberFormatException e) {
GuiHandler.size = DEFAULT_SIZE;
}
GuiHandler.buffer = new String[GuiHandler.size];
GuiHandler.start = 0;
GuiHandler.count = 0;
}
private static Filter makeFilter(final String name) {
if (name == null) return null;
try {
return (Filter) Class.forName(name).newInstance();
} catch (final Exception e) {
System.err.println("Unable to load filter: " + name);
}
return null;
}
private static Formatter makeFormatter(final String name) {
if (name == null) return null;
try {
return (Formatter) Class.forName(name).newInstance();
} catch (final Exception e) {
return new SimpleFormatter();
}
}
public final int getSize() {
return GuiHandler.size;
}
@Override
public final void publish(final LogRecord record) {
if (!isLoggable(record)) return;
final int ix = (GuiHandler.start + GuiHandler.count) % GuiHandler.buffer.length;
GuiHandler.buffer[ix] = getFormatter().format(record);
if (GuiHandler.count < GuiHandler.buffer.length) {
GuiHandler.count++;
} else {
GuiHandler.start++;
}
flush();
if (MemoryControl.shortStatus()) clear();
}
public final synchronized String[] getLogLines(final boolean reversed, int lineCount) {
if (lineCount > GuiHandler.count || lineCount < 0) lineCount = GuiHandler.count;
final List<String> logMessages = new ArrayList<String>(GuiHandler.count);
try {
final int theStart = (reversed) ? GuiHandler.start + GuiHandler.count - 1 : GuiHandler.start + GuiHandler.count - lineCount;
String record = null;
for (int i = 0; i < lineCount; i++) {
final int ix = (reversed) ? Math.abs((theStart - i) % GuiHandler.buffer.length) : (theStart + i) % GuiHandler.buffer.length;
record = GuiHandler.buffer[ix];
logMessages.add(record);
}
return logMessages.toArray(new String[logMessages.size()]);
} catch (final Exception ex) {
reportError(null, ex, ErrorManager.FORMAT_FAILURE);
return new String[]{"Error while formatting the logging message"};
}
}
@Override
public void flush() {
}
public static void clear() {
for (int i = 0; i < GuiHandler.buffer.length; i++) GuiHandler.buffer[i] = null;
GuiHandler.start = 0;
GuiHandler.count = 0;
}
@Override
public synchronized void close() throws SecurityException {
}
}