LoggerRepository


1   /*
2    * Copyright 1999-2005 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  import java.util.Enumeration  ;
21  
22  /**
23     A <code>LoggerRepository</code> is used to create and retrieve
24     <code>Loggers</code>. The relation between loggers in a repository
25     depends on the repository but typically loggers are arranged in a
26     named hierarchy.
27  
28     <p>In addition to the creational methods, a
29     <code>LoggerRepository</code> can be queried for existing loggers,
30     can act as a point of registry for events related to loggers.
31  
32     @author Ceki G&uuml;lc&uuml;
33     @since 1.2 */
34  public interface LoggerRepository {
35  
36    /**
37       Add a {@link HierarchyEventListener} event to the repository.
38    */
39    public
40    void addHierarchyEventListener(HierarchyEventListener listener);
41  
42    /**
43       Returns whether this repository is disabled for a given
44       level. The answer depends on the repository threshold and the
45       <code>level</code> parameter. See also {@link #setThreshold}
46       method.  */
47    boolean isDisabled(int level);
48  
49    /**
50       Set the repository-wide threshold. All logging requests below the
51       threshold are immediately dropped. By default, the threshold is
52       set to <code>Level.ALL</code> which has the lowest possible rank.  */
53    public
54    void setThreshold(Level level);
55  
56    /**
57        Another form of {@link #setThreshold(Level)} accepting a string
58        parameter instead of a <code>Level</code>. */
59    public
60    void setThreshold(String   val);
61  
62    public
63    void emitNoAppenderWarning(Category cat);
64  
65    /**
66       Get the repository-wide threshold. See {@link
67       #setThreshold(Level)} for an explanation. */
68    public
69    Level getThreshold();
70  
71    public
72    Logger getLogger(String   name);
73  
74    public
75    Logger getLogger(String   name, LoggerFactory factory);
76  
77    public
78    Logger getRootLogger();
79  
80    public
81    abstract
82    Logger exists(String   name);
83  
84    public
85    abstract
86    void shutdown();
87  
88    public
89    Enumeration   getCurrentLoggers();
90  
91    /**
92       @deprecated Please use {@link #getCurrentLoggers} instead.  */
93    public
94    Enumeration   getCurrentCategories();
95  
96  
97    public
98    abstract
99    void fireAddAppenderEvent(Category logger, Appender appender);
100 
101   public
102   abstract
103   void resetConfiguration();
104 
105 }
106
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