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 package org.apache.logging.log4j.core.jmx;
18
19 import java.util.List;
20
21 import javax.management.ObjectName;
22
23 import org.apache.logging.log4j.status.StatusData;
24
25 /**
26 * The MBean interface for monitoring and managing the {@code StatusLogger}.
27 */
28 public interface StatusLoggerAdminMBean {
29 /**
30 * ObjectName pattern ({@value}) for StatusLoggerAdmin MBeans.
31 * This pattern contains a variable, which is the name of the logger context.
32 * <p>
33 * You can find all registered StatusLoggerAdmin MBeans like this:
34 * </p>
35 * <pre>
36 * MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
37 * String pattern = String.format(StatusLoggerAdminMBean.PATTERN, "*");
38 * Set<ObjectName> statusLoggerNames = mbs.queryNames(new ObjectName(pattern), null);
39 * </pre>
40 * <p>
41 * Some characters are not allowed in ObjectNames. The logger context name
42 * may be quoted. When StatusLoggerAdmin MBeans are
43 * registered, their ObjectNames are created using this pattern as follows:
44 * </p>
45 * <pre>
46 * String ctxName = Server.escape(loggerContext.getName());
47 * String name = String.format(PATTERN, ctxName);
48 * ObjectName objectName = new ObjectName(name);
49 * </pre>
50 * @see Server#escape(String)
51 */
52 String PATTERN = Server.DOMAIN + ":type=%s,component=StatusLogger";
53
54 /**
55 * Notifications with this type have a {@code StatusData} userData object
56 * and a {@code null} message.
57 */
58 String NOTIF_TYPE_DATA = "com.apache.logging.log4j.core.jmx.statuslogger.data";
59
60 /**
61 * Notifications with this type have a formatted status data message string
62 * but no {@code StatusData} in their userData field.
63 */
64 String NOTIF_TYPE_MESSAGE = "com.apache.logging.log4j.core.jmx.statuslogger.message";
65
66 /**
67 * Returns the {@code ObjectName} that this status logger mbean is registered with.
68 * @return the ObjectName of this StatusLogger MBean
69 */
70 public ObjectName getObjectName();
71
72 /**
73 * Returns a list with the most recent {@code StatusData} objects in the
74 * status history. The list has up to 200 entries by default but the length
75 * can be configured with system property {@code "log4j2.status.entries"}.
76 * <p>
77 * Note that the returned objects may contain {@code Throwable}s from
78 * external libraries.
79 * </p>
80 * <p>
81 * JMX clients calling this method must be prepared to deal with the errors
82 * that occur if they do not have the class definition for such
83 * {@code Throwable}s in their classpath.
84 * </p>
85 *
86 * @return the most recent messages logged by the {@code StatusLogger}.
87 */
88 List<StatusData> getStatusData();
89
90 /**
91 * Returns a string array with the most recent messages in the status
92 * history. The list has up to 200 entries by default but the length can be
93 * configured with system property {@code "log4j2.status.entries"}.
94 *
95 * @return the most recent messages logged by the {@code StatusLogger}.
96 */
97 String[] getStatusDataHistory();
98
99 /**
100 * Returns the {@code StatusLogger} level as a String.
101 *
102 * @return the {@code StatusLogger} level.
103 */
104 String getLevel();
105
106 /**
107 * Sets the {@code StatusLogger} level to the specified value.
108 *
109 * @param level the new {@code StatusLogger} level.
110 * @throws IllegalArgumentException if the specified level is not one of
111 * "OFF", "FATAL", "ERROR", "WARN", "INFO", "DEBUG", "TRACE",
112 * "ALL"
113 */
114 void setLevel(String level);
115
116 /**
117 * Returns the name of the LoggerContext that the {@code StatusLogger} is associated with.
118 * @return logger context name
119 */
120 String getContextName();
121 }