/*
 * @(#)LoggingMXBean.java	1.7 04/04/20
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.util.logging;

/** 
 * The management interface for the logging facility.
 *
 * <p>There is a single global instance of the <tt>LoggingMXBean</tt>.
 * This instance is an 
 * <a href="ManagementFactory.html#MXBean">MXBean</a>
 * can be obtained by calling
 * the {@link LogManager#getLoggingMXBean} method or from the 
 * {@link java.lang.management.ManagementFactory#getPlatformMBeanServer
 * platform <tt>MBeanServer</tt>} method.
 *
 * <p>The {@link javax.management.ObjectName ObjectName} for uniquely 
 * identifying the <tt>LoggingMXBean</tt> within an MBeanServer is:
 * <blockquote>
 *    {@link LogManager#LOGGING_MXBEAN_NAME
 *           <tt>java.util.logging:type=Logging</tt>}
 * </blockquote>
 *
 * @see java.lang.management.ManagementFactory
 *
 * @author  Ron Mann 
 * @author  Mandy Chung
 * @version 1.7, 04/20/04
 * @since   1.5
 *
 */
public interface LoggingMXBean {
 
    /** 
     * Returns the list of currently registered loggers. This method
     * calls {@link LogManager#getLoggerNames} and returns a list 
     * of the logger names.
     * 
     * @return A list of <tt>String</tt> each of which is a
     *         currently registered <tt>Logger</tt> name.
     */
    public java.util.List<String> getLoggerNames();

    /** 
     * Gets the name of the log level associated with the specified logger.
     * If the specified logger does not exist, <tt>null</tt> 
     * is returned. 
     * This method first finds the logger of the given name and 
     * then returns the name of the log level by calling:
     * <blockquote>
     *   {@link Logger#getLevel Logger.getLevel()}.{@link Level#getName getName()};
     * </blockquote>
     *  
     * <p>
     * If the <tt>Level</tt> of the specified logger is <tt>null</tt>, 
     * which means that this logger's effective level is inherited 
     * from its parent, an empty string will be returned.
     * 
     * @param loggerName The name of the <tt>Logger</tt> to be retrieved.
     *
     * @return The name of the log level of the specified logger; or
     *         an empty string if the log level of the specified logger
     *         is <tt>null</tt>.  If the specified logger does not
     *         exist, <tt>null</tt> is returned.
     *
     * @see Logger#getLevel
     */
    public String getLoggerLevel( String loggerName );

    /** 
     * Sets the specified logger to the specified new level.
     * If the <tt>levelName</tt> is not <tt>null</tt>, the level
     * of the specified logger is set to the parsed <tt>Level</tt>
     * matching the <tt>levelName</tt>.
     * If the <tt>levelName</tt> is <tt>null</tt>, the level
     * of the specified logger is set to <tt>null</tt> and
     * the effective level of the logger is inherited from 
     * its nearest ancestor with a specific (non-null) level value.
     *
     * @param loggerName The name of the <tt>Logger</tt> to be set.
     *                   Must be non-null.
     * @param levelName The name of the level to set the specified logger to, 
     *                 or <tt>null</tt> if to set the level to inherit
     *                 from its nearest ancestor.
     *
     * @throws IllegalArgumentException if the specified logger 
     * does not exist, or <tt>levelName</tt> is not a valid level name.
     *
     * @throws SecurityException if a security manager exists and if
     * the caller does not have LoggingPermission("control").
     *
     * @see Logger#setLevel
     */
    public void setLoggerLevel( String loggerName, String levelName );

    /**
     * Returns the name of the parent for the specified logger.
     * If the specified logger does not exist, <tt>null</tt> is returned. 
     * If the specified logger is the root <tt>Logger</tt> in the namespace,
     * the result will be an empty string.
     *
     * @param loggerName The name of a <tt>Logger</tt>.
     *
     * @return the name of the nearest existing parent logger;
     *         an empty string if the specified logger is the root logger.
     *         If the specified logger does not exist, <tt>null</tt> 
     *         is returned. 
     */
    public String getParentLoggerName(String loggerName);
}