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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;

/**
 * The org.slf4j.Logger interface is the main user entry point of SLF4J API.
 * It is expected that logging takes place through concrete implementations
 * of this interface.
 * 

*

Typical usage pattern:

*
 * import org.slf4j.Logger;
 * import org.slf4j.LoggerFactory;
 *
 * public class Wombat {
 *
 *   final static Logger logger = LoggerFactory.getLogger(Wombat.class);
 *   Integer t;
 *   Integer oldT;
 *
 *   public void setTemperature(Integer temperature) {
 *     oldT = t;
 *     t = temperature;
 *     logger.debug("Temperature set to {}. Old temperature was {}.", t, oldT);
 *     if(temperature.intValue() > 50) {
 *       logger.info("Temperature has risen above 50 degrees.");
 *     }
 *   }
 * }
 * 
* * Be sure to read the FAQ entry relating to parameterized * logging. Note that logging statements can be parameterized in * presence of an exception/throwable. * *

Once you are comfortable using loggers, i.e. instances of this interface, consider using * MDC as well as Markers.

* * @author Ceki Gülcü */ public interface Logger { /** * Case insensitive String constant used to retrieve the name of the root logger. * * @since 1.3 */ final public String ROOT_LOGGER_NAME = "ROOT"; /** * Return the name of this Logger instance. * @return name of this logger instance */ public String getName(); /** * Is the logger instance enabled for the TRACE level? * * @return True if this Logger is enabled for the TRACE level, * false otherwise. * @since 1.4 */ public boolean isTraceEnabled(); /** * Log a message at the TRACE level. * * @param msg the message string to be logged * @since 1.4 */ public void trace(String msg); /** * Log a message at the TRACE level according to the specified format * and argument. *

*

This form avoids superfluous object creation when the logger * is disabled for the TRACE level.

* * @param format the format string * @param arg the argument * @since 1.4 */ public void trace(String format, Object arg); /** * Log a message at the TRACE level according to the specified format * and arguments. *

*

This form avoids superfluous object creation when the logger * is disabled for the TRACE level.

* * @param format the format string * @param arg1 the first argument * @param arg2 the second argument * @since 1.4 */ public void trace(String format, Object arg1, Object arg2); /** * Log a message at the TRACE level according to the specified format * and arguments. *

*

This form avoids superfluous string concatenation when the logger * is disabled for the TRACE level. However, this variant incurs the hidden * (and relatively small) cost of creating an Object[] before invoking the method, * even if this logger is disabled for TRACE. The variants taking {@link #trace(String, Object) one} and * {@link #trace(String, Object, Object) two} arguments exist solely in order to avoid this hidden cost.

* * @param format the format string * @param arguments a list of 3 or more arguments * @since 1.4 */ public void trace(String format, Object... arguments); /** * Log an exception (throwable) at the TRACE level with an * accompanying message. * * @param msg the message accompanying the exception * @param t the exception (throwable) to log * @since 1.4 */ public void trace(String msg, Throwable t); /** * Similar to {@link #isTraceEnabled()} method except that the * marker data is also taken into account. * * @param marker The marker data to take into consideration * @return True if this Logger is enabled for the TRACE level, * false otherwise. * * @since 1.4 */ public boolean isTraceEnabled(Marker marker); /** * Log a message with the specific Marker at the TRACE level. * * @param marker the marker data specific to this log statement * @param msg the message string to be logged * @since 1.4 */ public void trace(Marker marker, String msg); /** * This method is similar to {@link #trace(String, Object)} method except that the * marker data is also taken into consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg the argument * @since 1.4 */ public void trace(Marker marker, String format, Object arg); /** * This method is similar to {@link #trace(String, Object, Object)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg1 the first argument * @param arg2 the second argument * @since 1.4 */ public void trace(Marker marker, String format, Object arg1, Object arg2); /** * This method is similar to {@link #trace(String, Object...)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param argArray an array of arguments * @since 1.4 */ public void trace(Marker marker, String format, Object... argArray); /** * This method is similar to {@link #trace(String, Throwable)} method except that the * marker data is also taken into consideration. * * @param marker the marker data specific to this log statement * @param msg the message accompanying the exception * @param t the exception (throwable) to log * @since 1.4 */ public void trace(Marker marker, String msg, Throwable t); /** * Is the logger instance enabled for the DEBUG level? * * @return True if this Logger is enabled for the DEBUG level, * false otherwise. */ public boolean isDebugEnabled(); /** * Log a message at the DEBUG level. * * @param msg the message string to be logged */ public void debug(String msg); /** * Log a message at the DEBUG level according to the specified format * and argument. *

*

This form avoids superfluous object creation when the logger * is disabled for the DEBUG level.

* * @param format the format string * @param arg the argument */ public void debug(String format, Object arg); /** * Log a message at the DEBUG level according to the specified format * and arguments. *

*

This form avoids superfluous object creation when the logger * is disabled for the DEBUG level.

* * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void debug(String format, Object arg1, Object arg2); /** * Log a message at the DEBUG level according to the specified format * and arguments. *

*

This form avoids superfluous string concatenation when the logger * is disabled for the DEBUG level. However, this variant incurs the hidden * (and relatively small) cost of creating an Object[] before invoking the method, * even if this logger is disabled for DEBUG. The variants taking * {@link #debug(String, Object) one} and {@link #debug(String, Object, Object) two} * arguments exist solely in order to avoid this hidden cost.

* * @param format the format string * @param arguments a list of 3 or more arguments */ public void debug(String format, Object... arguments); /** * Log an exception (throwable) at the DEBUG level with an * accompanying message. * * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void debug(String msg, Throwable t); /** * Similar to {@link #isDebugEnabled()} method except that the * marker data is also taken into account. * * @param marker The marker data to take into consideration * @return True if this Logger is enabled for the DEBUG level, * false otherwise. */ public boolean isDebugEnabled(Marker marker); /** * Log a message with the specific Marker at the DEBUG level. * * @param marker the marker data specific to this log statement * @param msg the message string to be logged */ public void debug(Marker marker, String msg); /** * This method is similar to {@link #debug(String, Object)} method except that the * marker data is also taken into consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg the argument */ public void debug(Marker marker, String format, Object arg); /** * This method is similar to {@link #debug(String, Object, Object)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void debug(Marker marker, String format, Object arg1, Object arg2); /** * This method is similar to {@link #debug(String, Object...)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arguments a list of 3 or more arguments */ public void debug(Marker marker, String format, Object... arguments); /** * This method is similar to {@link #debug(String, Throwable)} method except that the * marker data is also taken into consideration. * * @param marker the marker data specific to this log statement * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void debug(Marker marker, String msg, Throwable t); /** * Is the logger instance enabled for the INFO level? * * @return True if this Logger is enabled for the INFO level, * false otherwise. */ public boolean isInfoEnabled(); /** * Log a message at the INFO level. * * @param msg the message string to be logged */ public void info(String msg); /** * Log a message at the INFO level according to the specified format * and argument. *

*

This form avoids superfluous object creation when the logger * is disabled for the INFO level.

* * @param format the format string * @param arg the argument */ public void info(String format, Object arg); /** * Log a message at the INFO level according to the specified format * and arguments. *

*

This form avoids superfluous object creation when the logger * is disabled for the INFO level.

* * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void info(String format, Object arg1, Object arg2); /** * Log a message at the INFO level according to the specified format * and arguments. *

*

This form avoids superfluous string concatenation when the logger * is disabled for the INFO level. However, this variant incurs the hidden * (and relatively small) cost of creating an Object[] before invoking the method, * even if this logger is disabled for INFO. The variants taking * {@link #info(String, Object) one} and {@link #info(String, Object, Object) two} * arguments exist solely in order to avoid this hidden cost.

* * @param format the format string * @param arguments a list of 3 or more arguments */ public void info(String format, Object... arguments); /** * Log an exception (throwable) at the INFO level with an * accompanying message. * * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void info(String msg, Throwable t); /** * Similar to {@link #isInfoEnabled()} method except that the marker * data is also taken into consideration. * * @param marker The marker data to take into consideration * @return true if this logger is warn enabled, false otherwise */ public boolean isInfoEnabled(Marker marker); /** * Log a message with the specific Marker at the INFO level. * * @param marker The marker specific to this log statement * @param msg the message string to be logged */ public void info(Marker marker, String msg); /** * This method is similar to {@link #info(String, Object)} method except that the * marker data is also taken into consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg the argument */ public void info(Marker marker, String format, Object arg); /** * This method is similar to {@link #info(String, Object, Object)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void info(Marker marker, String format, Object arg1, Object arg2); /** * This method is similar to {@link #info(String, Object...)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arguments a list of 3 or more arguments */ public void info(Marker marker, String format, Object... arguments); /** * This method is similar to {@link #info(String, Throwable)} method * except that the marker data is also taken into consideration. * * @param marker the marker data for this log statement * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void info(Marker marker, String msg, Throwable t); /** * Is the logger instance enabled for the WARN level? * * @return True if this Logger is enabled for the WARN level, * false otherwise. */ public boolean isWarnEnabled(); /** * Log a message at the WARN level. * * @param msg the message string to be logged */ public void warn(String msg); /** * Log a message at the WARN level according to the specified format * and argument. *

*

This form avoids superfluous object creation when the logger * is disabled for the WARN level.

* * @param format the format string * @param arg the argument */ public void warn(String format, Object arg); /** * Log a message at the WARN level according to the specified format * and arguments. *

*

This form avoids superfluous string concatenation when the logger * is disabled for the WARN level. However, this variant incurs the hidden * (and relatively small) cost of creating an Object[] before invoking the method, * even if this logger is disabled for WARN. The variants taking * {@link #warn(String, Object) one} and {@link #warn(String, Object, Object) two} * arguments exist solely in order to avoid this hidden cost.

* * @param format the format string * @param arguments a list of 3 or more arguments */ public void warn(String format, Object... arguments); /** * Log a message at the WARN level according to the specified format * and arguments. *

*

This form avoids superfluous object creation when the logger * is disabled for the WARN level.

* * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void warn(String format, Object arg1, Object arg2); /** * Log an exception (throwable) at the WARN level with an * accompanying message. * * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void warn(String msg, Throwable t); /** * Similar to {@link #isWarnEnabled()} method except that the marker * data is also taken into consideration. * * @param marker The marker data to take into consideration * @return True if this Logger is enabled for the WARN level, * false otherwise. */ public boolean isWarnEnabled(Marker marker); /** * Log a message with the specific Marker at the WARN level. * * @param marker The marker specific to this log statement * @param msg the message string to be logged */ public void warn(Marker marker, String msg); /** * This method is similar to {@link #warn(String, Object)} method except that the * marker data is also taken into consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg the argument */ public void warn(Marker marker, String format, Object arg); /** * This method is similar to {@link #warn(String, Object, Object)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void warn(Marker marker, String format, Object arg1, Object arg2); /** * This method is similar to {@link #warn(String, Object...)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arguments a list of 3 or more arguments */ public void warn(Marker marker, String format, Object... arguments); /** * This method is similar to {@link #warn(String, Throwable)} method * except that the marker data is also taken into consideration. * * @param marker the marker data for this log statement * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void warn(Marker marker, String msg, Throwable t); /** * Is the logger instance enabled for the ERROR level? * * @return True if this Logger is enabled for the ERROR level, * false otherwise. */ public boolean isErrorEnabled(); /** * Log a message at the ERROR level. * * @param msg the message string to be logged */ public void error(String msg); /** * Log a message at the ERROR level according to the specified format * and argument. *

*

This form avoids superfluous object creation when the logger * is disabled for the ERROR level.

* * @param format the format string * @param arg the argument */ public void error(String format, Object arg); /** * Log a message at the ERROR level according to the specified format * and arguments. *

*

This form avoids superfluous object creation when the logger * is disabled for the ERROR level.

* * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void error(String format, Object arg1, Object arg2); /** * Log a message at the ERROR level according to the specified format * and arguments. *

*

This form avoids superfluous string concatenation when the logger * is disabled for the ERROR level. However, this variant incurs the hidden * (and relatively small) cost of creating an Object[] before invoking the method, * even if this logger is disabled for ERROR. The variants taking * {@link #error(String, Object) one} and {@link #error(String, Object, Object) two} * arguments exist solely in order to avoid this hidden cost.

* * @param format the format string * @param arguments a list of 3 or more arguments */ public void error(String format, Object... arguments); /** * Log an exception (throwable) at the ERROR level with an * accompanying message. * * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void error(String msg, Throwable t); /** * Similar to {@link #isErrorEnabled()} method except that the * marker data is also taken into consideration. * * @param marker The marker data to take into consideration * @return True if this Logger is enabled for the ERROR level, * false otherwise. */ public boolean isErrorEnabled(Marker marker); /** * Log a message with the specific Marker at the ERROR level. * * @param marker The marker specific to this log statement * @param msg the message string to be logged */ public void error(Marker marker, String msg); /** * This method is similar to {@link #error(String, Object)} method except that the * marker data is also taken into consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg the argument */ public void error(Marker marker, String format, Object arg); /** * This method is similar to {@link #error(String, Object, Object)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arg1 the first argument * @param arg2 the second argument */ public void error(Marker marker, String format, Object arg1, Object arg2); /** * This method is similar to {@link #error(String, Object...)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param format the format string * @param arguments a list of 3 or more arguments */ public void error(Marker marker, String format, Object... arguments); /** * This method is similar to {@link #error(String, Throwable)} * method except that the marker data is also taken into * consideration. * * @param marker the marker data specific to this log statement * @param msg the message accompanying the exception * @param t the exception (throwable) to log */ public void error(Marker marker, String msg, Throwable t); }




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