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1   /*
2    * Copyright 2001-2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.log4j.spi;
18  
19  import org.apache.log4j.*;
20  
21  /**
22     Listen to events occurring within a {@link
23     org.apache.log4j.Hierarchy Hierarchy}.
24  
25     @author Ceki Gülcü
26     @since 1.2
27  
28   */
29  public interface HierarchyEventListener {
30  
31      // public
32      // void categoryCreationEvent(Category cat);
33  
34      public void addAppenderEvent(Category cat, Appender appender);
35  
36      public void removeAppenderEvent(Category cat, Appender appender);
37  
38  }