/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements.  See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License.  You may obtain a copy of the License at *  *      http://www.apache.org/licenses/LICENSE-2.0 *  * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.apache.log4j.spi;import org.apache.log4j.*;import java.util.Enumeration;/**   A <code>LoggerRepository</code> is used to create and retrieve   <code>Loggers</code>. The relation between loggers in a repository   depends on the repository but typically loggers are arranged in a   named hierarchy.   <p>In addition to the creational methods, a   <code>LoggerRepository</code> can be queried for existing loggers,   can act as a point of registry for events related to loggers.   @author Ceki G&uuml;lc&uuml;   @since 1.2 */public interface LoggerRepository {  /**     Add a {@link HierarchyEventListener} event to the repository.  */  public  void addHierarchyEventListener(HierarchyEventListener listener);  /**     Returns whether this repository is disabled for a given     level. The answer depends on the repository threshold and the     <code>level</code> parameter. See also {@link #setThreshold}     method.  */  boolean isDisabled(int level);  /**     Set the repository-wide threshold. All logging requests below the     threshold are immediately dropped. By default, the threshold is     set to <code>Level.ALL</code> which has the lowest possible rank.  */  public  void setThreshold(Level level);  /**      Another form of {@link #setThreshold(Level)} accepting a string      parameter instead of a <code>Level</code>. */  public  void setThreshold(String val);  public  void emitNoAppenderWarning(Category cat);  /**     Get the repository-wide threshold. See {@link     #setThreshold(Level)} for an explanation. */  public  Level getThreshold();  public  Logger getLogger(String name);  public  Logger getLogger(String name, LoggerFactory factory);  public  Logger getRootLogger();  public  abstract  Logger exists(String name);  public  abstract  void shutdown();  public  Enumeration getCurrentLoggers();  /**     Deprecated. Please use {@link #getCurrentLoggers} instead.  */  public  Enumeration getCurrentCategories();  public  abstract  void fireAddAppenderEvent(Category logger, Appender appender);  public  abstract  void resetConfiguration();}