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  * Copyright 2001-2004 The Apache Software Foundation.
  * Licensed 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.log4j.spi;
A LoggerRepository is used to create and retrieve Loggers. The relation between loggers in a repository depends on the repository but typically loggers are arranged in a named hierarchy.

In addition to the creational methods, a LoggerRepository can be queried for existing loggers, can act as a point of registry for events related to loggers.

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public interface LoggerRepository {

Add a 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 level parameter. See also setThreshold(org.apache.log4j.Level) 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 Level.ALL which has the lowest possible rank.
    public void setThreshold(Level level);

Another form of setThreshold(org.apache.log4j.Level) accepting a string parameter instead of a Level.
    public void setThreshold(String val);
    public void emitNoAppenderWarning(Category cat);

Get the repository-wide threshold. See setThreshold(org.apache.log4j.Level) for an explanation.
    public Level getThreshold();
    public Logger getLogger(String name);
    public Logger getLogger(String nameLoggerFactory factory);
    public Logger getRootLogger();
    abstract Logger exists(String name);
    abstract void shutdown();
    public Enumeration getCurrentLoggers();

Deprecated. Please use getCurrentLoggers() instead.
    abstract void fireAddAppenderEvent(Category loggerAppender appender);
    abstract void resetConfiguration();
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