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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.log4j.spi;
    19
    20  import org.apache.log4j.Appender;
    21  import org.apache.log4j.Category;
    22
    23  /**
    24     Listen to events occuring within a {@link
    25     org.apache.log4j.Hierarchy Hierarchy}.
    26
    27     @author Ceki G&uuml;lc&uuml;
    28     @since 1.2
    29
    30   */
    31  public interface HierarchyEventListener {
    32
    33
    34    //public
    35    //void categoryCreationEvent(Category cat);
    36
    37
    38    public
    39    void addAppenderEvent(Category cat, Appender appender);
    40
    41    public
    42    void removeAppenderEvent(Category cat, Appender appender);
    43
    44
    45  }