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com.mchange.v2.log.MLog Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v2.log;
import java.util.List;
import java.util.ArrayList;
import com.mchange.v1.util.StringTokenizerUtils;
import com.mchange.v2.cfg.MultiPropertiesConfig;
public abstract class MLog
{
// MT: Protected by MLog.class' lock
private static NameTransformer _transformer;
private static MLog _mlog;
private static MLogger _logger;
static
{ refreshConfig( null, null ); }
private static synchronized NameTransformer transformer() { return _transformer; }
private static synchronized MLog mlog() { return _mlog; }
private static synchronized MLogger logger() { return _logger; }
public static void refreshConfig() { refreshConfig( null, null ); } // no sync' 'cuz the internal method does it
public static void forceFallback() { forceFallback( null ); } // no sync' 'cuz the internal method does it
/**
* Returns the MLog instance that was replaced by this operation
*/
public static synchronized MLog forceFallback( MLevel level )
{
MLog replaced = _mlog;
FallbackMLog fmlog = new FallbackMLog();
if (level != null) fmlog.overrideCutoffLevel( level );
_mlog = fmlog;
_logger = _mlog.getLogger( MLog.class );
info("Forced replacement of " + replaced.getClass().getName() + " with fallback " + _mlog.getClass().getName() + " (with cutoff " + fmlog.cutoffLevel() + ") -- Named loggers not supported, everything goes to System.err.");
return replaced;
}
/**
* Returns the MLog instance that was replaced by this operation
*/
public static synchronized MLog forceMLog( MLog mlog )
{
MLog replaced = _mlog;
_mlog = mlog;
_logger = _mlog.getLogger( MLog.class );
info("Forced replacement of " + replaced.getClass().getName() + " with " + _mlog.getClass().getName());
return replaced;
}
public static synchronized void refreshConfig( MultiPropertiesConfig[] overrides, String overridesDescription )
{
MLogConfig.refresh( overrides, overridesDescription );
String classnamesStr = MLogConfig.getProperty("com.mchange.v2.log.MLog");
String[] classnames = null;
if (classnamesStr == null)
classnamesStr = MLogConfig.getProperty("com.mchange.v2.log.mlog");
if (classnamesStr != null)
classnames = StringTokenizerUtils.tokenizeToArray( classnamesStr, ", \t\r\n" );
boolean warn = false;
MLog tmpml = null;
if (classnames != null)
tmpml = findByClassnames( classnames, true );
if (tmpml == null)
tmpml = findByClassnames( MLogClasses.SEARCH_CLASSNAMES, false );
if (tmpml == null)
{
warn = true;
tmpml = new FallbackMLog();
}
_mlog = tmpml;
if (warn)
info("Using " + _mlog.getClass().getName() + " -- Named loggers not supported, everything goes to System.err.");
NameTransformer tmpt = null;
String tClassName = MLogConfig.getProperty("com.mchange.v2.log.NameTransformer");
if (tClassName == null)
tClassName = MLogConfig.getProperty("com.mchange.v2.log.nametransformer");
try
{
if (tClassName != null)
tmpt = (NameTransformer) Class.forName( tClassName ).newInstance();
}
catch ( Exception e )
{
System.err.println("Failed to instantiate com.mchange.v2.log.NameTransformer '" + tClassName + "'!");
e.printStackTrace();
}
_transformer = tmpt;
_logger = _mlog.getLogger( MLog.class );
// at this point we are initialized; except for the initilaizer, what follows is essentially client code
// which we run in a throwaway Thread not holding the class' / classloading lock
Thread bannerThread = new Thread("MLog-Init-Reporter")
{
final MLogger logo;
String loggerDesc;
{
logo = _logger;
loggerDesc = _mlog.getClass().getName();
}
public void run()
{
if ("com.mchange.v2.log.jdk14logging.Jdk14MLog".equals( loggerDesc ))
loggerDesc = "java 1.4+ standard";
else if ("com.mchange.v2.log.log4j2.Log4j2MLog".equals( loggerDesc ))
loggerDesc = "log4j2";
else if ("com.mchange.v2.log.log4j.Log4jMLog".equals( loggerDesc ))
loggerDesc = "log4j";
else if ("com.mchange.v2.log.slf4j.Slf4jMLog".equals( loggerDesc ))
loggerDesc = "slf4j";
if (logo.isLoggable( MLevel.INFO ))
logo.log( MLevel.INFO, "MLog clients using " + loggerDesc + " logging.");
//System.err.println(mlog);
MLogConfig.logDelayedItems( logo );
if ( logo.isLoggable( MLevel.FINEST ) )
logo.log( MLevel.FINEST, "Config available to MLog library: " + MLogConfig.dump() );
}
};
bannerThread.start();
}
// does not require statics to be initialized
public static MLog findByClassnames( String[] classnames, boolean log_attempts_to_stderr )
{
List attempts = null;
for (int i = 0, len = classnames.length; i < len; ++i)
{
try { return (MLog) Class.forName( MLogClasses.resolveIfAlias( classnames[i] ) ).newInstance(); }
catch (Exception e)
{
if ( e instanceof MLogInitializationException )
System.err.println("MLog initialization issue: " + e.getMessage());
if (attempts == null)
attempts = new ArrayList();
attempts.add( classnames[i] );
if ( log_attempts_to_stderr )
{
System.err.println("com.mchange.v2.log.MLog '" + classnames[i] + "' could not be loaded!");
e.printStackTrace();
}
}
}
System.err.println("Tried without success to load the following MLog classes:");
for (int i = 0, len = attempts.size(); i < len; ++i)
System.err.println("\t" + attempts.get(i));
return null;
}
public static MLog instance()
{ return mlog(); }
public static MLogger getLogger(String name)
{
NameTransformer xformer = null;
MLog insty = null;
synchronized ( MLog.class )
{
xformer = transformer();
insty = instance();
}
MLogger out;
if ( xformer == null )
out = instance().getMLogger( name );
else
{
String xname = xformer.transformName( name );
if (xname != null)
out = insty.getMLogger( xname );
else
out = insty.getMLogger( name );
}
return out;
}
public static MLogger getLogger(Class cl)
{
NameTransformer xformer = null;
MLog insty = null;
synchronized ( MLog.class )
{
xformer = transformer();
insty = instance();
}
MLogger out;
if ( xformer == null )
out = insty.getMLogger( cl );
else
{
String xname = xformer.transformName( cl );
if (xname != null)
out = insty.getMLogger( xname );
else
out = insty.getMLogger( cl );
}
return out;
}
public static MLogger getLogger()
{
NameTransformer xformer = null;
MLog insty = null;
synchronized ( MLog.class )
{
xformer = transformer();
insty = instance();
}
MLogger out;
if ( xformer == null )
out = insty.getMLogger();
else
{
String xname = xformer.transformName();
if (xname != null)
out = insty.getMLogger( xname );
else
out = insty.getMLogger();
}
return out;
}
public static void log(MLevel l, String msg)
{ instance().getLogger().log( l, msg ); }
public static void log(MLevel l, String msg, Object param)
{ instance().getLogger().log( l, msg, param ); }
public static void log(MLevel l,String msg, Object[] params)
{ instance().getLogger().log( l, msg, params ); }
public static void log(MLevel l, String msg,Throwable t)
{ instance().getLogger().log( l, msg, t ); }
public static void logp(MLevel l, String srcClass, String srcMeth, String msg)
{ instance().getLogger().logp( l, srcClass, srcMeth, msg ); }
public static void logp(MLevel l, String srcClass, String srcMeth, String msg, Object param)
{ instance().getLogger().logp( l, srcClass, srcMeth, msg, param ); }
public static void logp(MLevel l, String srcClass, String srcMeth, String msg, Object[] params)
{ instance().getLogger().logp( l, srcClass, srcMeth, msg, params ); }
public static void logp(MLevel l, String srcClass, String srcMeth, String msg, Throwable t)
{ instance().getLogger().logp( l, srcClass, srcMeth, msg, t ); }
public static void logrb(MLevel l, String srcClass, String srcMeth, String rb, String msg)
{ instance().getLogger().logp( l, srcClass, srcMeth, rb, msg ); }
public static void logrb(MLevel l, String srcClass, String srcMeth, String rb, String msg, Object param)
{ instance().getLogger().logrb( l, srcClass, srcMeth, rb, msg, param ); }
public static void logrb(MLevel l, String srcClass, String srcMeth, String rb, String msg, Object[] params)
{ instance().getLogger().logrb( l, srcClass, srcMeth, rb, msg, params ); }
public static void logrb(MLevel l, String srcClass, String srcMeth, String rb, String msg, Throwable t)
{ instance().getLogger().logrb( l, srcClass, srcMeth, rb, msg, t ); }
public static void entering(String srcClass, String srcMeth)
{ instance().getLogger().entering( srcClass, srcMeth ); }
public static void entering(String srcClass, String srcMeth, Object param)
{ instance().getLogger().entering( srcClass, srcMeth, param ); }
public static void entering(String srcClass, String srcMeth, Object params[])
{ instance().getLogger().entering( srcClass, srcMeth, params ); }
public static void exiting(String srcClass, String srcMeth)
{ instance().getLogger().exiting( srcClass, srcMeth ); }
public static void exiting(String srcClass, String srcMeth, Object result)
{ instance().getLogger().exiting( srcClass, srcMeth, result ); }
public static void throwing(String srcClass, String srcMeth, Throwable t)
{ instance().getLogger().throwing( srcClass, srcMeth, t); }
public static void severe(String msg)
{ instance().getLogger().severe( msg ); }
public static void warning(String msg)
{ instance().getLogger().warning( msg ); }
public static void info(String msg)
{ instance().getLogger().info( msg ); }
public static void config(String msg)
{ instance().getLogger().config( msg ); }
public static void fine(String msg)
{ instance().getLogger().fine( msg ); }
public static void finer(String msg)
{ instance().getLogger().finer( msg ); }
public static void finest(String msg)
{ instance().getLogger().finest( msg ); }
// convenience implementation, may be overridden
public MLogger getMLogger(Class cl)
{ return getMLogger( cl.getName() ); }
public abstract MLogger getMLogger(String name);
public abstract MLogger getMLogger();
}
