org.metacsp.utility.logging.MetaCSPLogging Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2010-2013 Federico Pecora
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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package org.metacsp.utility.logging;
import java.io.Serializable;
import java.util.HashMap;
import java.util.logging.ConsoleHandler;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import org.metacsp.framework.meta.MetaConstraintSolver;
/**
*
* This class provides basic console logging functionalities for the MetaCSP Framework.
* It employs the {@link java.util.logging.Logger} class, and defines uniform formatter
* for the framework.
*
*
*
* Each class should have its own specific logger, which is provided by the factory method of
* {@link MetaCSPLogging}, e.g.,
*
*
*
* private Logger logger = MetaCSPLogging.getLogger(this.getClass());
*
*
*
* The obtained {@code logger} instance can then be used to log messages at different
* log-levels (see {@link Level}) through the {@link Logger}'s specific methods, e.g.,
* {@code info(String msg)}, {@code fine(String msg)}, {@code finer(String msg)},
* {@code warning(String msg)} etc.
*
*
*
* To enable logging at a specific level (e.g., from your test class), the static
* methods {@code setLevel(Class c, Level l)} and {@code setLevel(Level l)} are provided.
* The former sets the desired level on a specific class (e.g., suppose you want to log at level
* {@code Level.FINE} only for a {@link MetaConstraintSolver}); the latter activates that log
* level for all classes which use a {@link Logger} provided by the {@link MetaCSPLogging} factory
* method.
*
*
* @author Federico Pecora
*
*/
public final class MetaCSPLogging implements Serializable{
private transient static HashMap,Logger> loggers = new HashMap,Logger>();
private transient static HashMap,Level> tempLevels = new HashMap,Level>();
private static final long serialVersionUID = 7526472295622776139L;
private static Level globalLevel = null;
static { }
private MetaCSPLogging() {}
/**
* Set a desired log level for all loggers.
* @param l The desired log level.
*/
public static void setLevel(Level l) {
for (Logger log : loggers.values()) log.setLevel(l);
globalLevel = l;
}
/**
* Set a desired log level for a specific class.
* @param c The class to set the log level for.
* @param l The desired log level.
*/
public static void setLevel(Class c, Level l) /* throws LoggerNotDefined */ {
if (!loggers.containsKey(c)) tempLevels.put(c, l);
else loggers.get(c).setLevel(l);
//System.out.println("Set level " + l + " for logger " + loggers.get(c).getName());
}
/**
* Provides a reference to a {@link Logger} which will format log messages according to
* the common MetaCSP Framework formatting.
* @param c The class within which the logger should be used.
* @return A {@link Logger} that can be used to log messages in the given class.
*/
public static Logger getLogger(final Class c) {
if (loggers.get(c) == null) {
//System.out.println("Making new logger for " + c.getSimpleName());
final Logger logger = Logger.getLogger(c.getSimpleName());
loggers.put(c, logger);
for(Handler h : logger.getParent().getHandlers()) { logger.getParent().removeHandler(h); }
ConsoleHandler h = new ConsoleHandler();
h.setFormatter(new Formatter() {
@Override
public String format(LogRecord arg0) {
//TODO: Make indentation
return ("[" + logger.getName() + "] " + arg0.getMessage() + "\n");
}
});
h.setLevel(Level.ALL);
logger.addHandler(h);
if (tempLevels.keySet().contains(c)) {
logger.setLevel(tempLevels.get(c));
tempLevels.remove(c);
}
if (globalLevel != null) logger.setLevel(globalLevel);
return logger;
}
//System.out.println("Returning old logger for " + c.getSimpleName());
return loggers.get(c);
}
}