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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.

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/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * 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.
 *
 */
package org.slf4j.spi;

import org.slf4j.Logger;
import org.slf4j.Marker;

/**
 * An optional interface helping integration with logging systems capable of 
 * extracting location information. This interface is mainly used by SLF4J bridges 
 * such as jcl-over-slf4j, jul-to-slf4j and log4j-over-slf4j or {@link Logger} wrappers
 * which need to provide hints so that the underlying logging system can extract
 * the correct location information (method name, line number).
 *
 * @author Ceki Gulcu
 * @since 1.3
 */
public interface LocationAwareLogger extends Logger {

    final public int TRACE_INT = 00;
    final public int DEBUG_INT = 10;
    final public int INFO_INT = 20;
    final public int WARN_INT = 30;
    final public int ERROR_INT = 40;

    /**
     * Printing method with support for location information. 
     * 
     * @param marker The marker to be used for this event, may be null.
     * @param fqcn The fully qualified class name of the logger instance,
     * typically the logger class, logger bridge or a logger wrapper.
     * @param level One of the level integers defined in this interface
     * @param message The message for the log event
     * @param t Throwable associated with the log event, may be null.
     */
    public void log(Marker marker, String fqcn, int level, String message, Object[] argArray, Throwable t);

}