/*
 * 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.chainsaw;

import java.util.Collection;


/**
 * Implementations of this model contain all the known Logger
 * names within it's model space.
 *
 * @author Paul Smith psmith@apache.org
 */
public interface LoggerNameModel {

    /**
     * Returns an unmodifiable Collection of the uniquely
     * known LoggerNames within this model.
     *
     * @return unmodifiable Collection of Logger name Strings
     */
    Collection getLoggerNames();

    /**
     * Attempts to add the loggerName to the model, and returns
     * true if it does, i.e that the loggerName is new, otherwise
     * it is ignored.
     * <p>
     * If the loggerName is new for this model, all the LoggerNameListeners
     * are notified using this thread.
     *
     * @param loggerName
     */
    boolean addLoggerName(String loggerName);

    /**
     * The logger names have been cleared
     */
    void reset();

    void addLoggerNameListener(LoggerNameListener l);

    void removeLoggerNameListener(LoggerNameListener l);
}