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18 package org.apache.log4j.spi;
19
20 import org.apache.log4j.*;
21 import java.util.Enumeration;
22
23 /***
24 A <code>LoggerRepository</code> is used to create and retrieve
25 <code>Loggers</code>. The relation between loggers in a repository
26 depends on the repository but typically loggers are arranged in a
27 named hierarchy.
28
29 <p>In addition to the creational methods, a
30 <code>LoggerRepository</code> can be queried for existing loggers,
31 can act as a point of registry for events related to loggers.
32
33 @author Ceki Gülcü
34 @since 1.2 */
35 public interface LoggerRepository {
36
37 /***
38 Add a {@link HierarchyEventListener} event to the repository.
39 */
40 public
41 void addHierarchyEventListener(HierarchyEventListener listener);
42
43 /***
44 Returns whether this repository is disabled for a given
45 level. The answer depends on the repository threshold and the
46 <code>level</code> parameter. See also {@link #setThreshold}
47 method. */
48 boolean isDisabled(int level);
49
50 /***
51 Set the repository-wide threshold. All logging requests below the
52 threshold are immediately dropped. By default, the threshold is
53 set to <code>Level.ALL</code> which has the lowest possible rank. */
54 public
55 void setThreshold(Level level);
56
57 /***
58 Another form of {@link #setThreshold(Level)} accepting a string
59 parameter instead of a <code>Level</code>. */
60 public
61 void setThreshold(String val);
62
63 public
64 void emitNoAppenderWarning(Category cat);
65
66 /***
67 Get the repository-wide threshold. See {@link
68 #setThreshold(Level)} for an explanation. */
69 public
70 Level getThreshold();
71
72 public
73 Logger getLogger(String name);
74
75 public
76 Logger getLogger(String name, LoggerFactory factory);
77
78 public
79 Logger getRootLogger();
80
81 public
82 abstract
83 Logger exists(String name);
84
85 public
86 abstract
87 void shutdown();
88
89 public
90 Enumeration getCurrentLoggers();
91
92 /***
93 Deprecated. Please use {@link #getCurrentLoggers} instead. */
94 public
95 Enumeration getCurrentCategories();
96
97
98 public
99 abstract
100 void fireAddAppenderEvent(Category logger, Appender appender);
101
102 public
103 abstract
104 void resetConfiguration();
105
106 }