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5b5ffa03 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
5b5ffa03 | 3 | * |
c0c0989a MJ |
4 | * Copyright (C) 2015 EfficiOS Inc. |
5 | * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com> | |
5b5ffa03 DG |
6 | */ |
7 | ||
d60dfbe4 AM |
8 | package org.lttng.ust.agent.jul; |
9 | ||
68a1ef73 AM |
10 | import java.util.Collection; |
11 | import java.util.Collections; | |
12 | import java.util.List; | |
46070114 AM |
13 | import java.util.Set; |
14 | import java.util.TreeSet; | |
68a1ef73 AM |
15 | import java.util.logging.Handler; |
16 | import java.util.logging.LogManager; | |
17 | import java.util.logging.Logger; | |
18 | ||
d60dfbe4 AM |
19 | import org.lttng.ust.agent.AbstractLttngAgent; |
20 | ||
21 | /** | |
22 | * Agent implementation for tracing from JUL loggers. | |
23 | * | |
24 | * @author Alexandre Montplaisir | |
25 | */ | |
26 | class LttngJulAgent extends AbstractLttngAgent<LttngLogHandler> { | |
27 | ||
28 | private static LttngJulAgent instance = null; | |
29 | ||
30 | private LttngJulAgent() { | |
31 | super(Domain.JUL); | |
32 | } | |
5b5ffa03 | 33 | |
d60dfbe4 AM |
34 | public static synchronized LttngJulAgent getInstance() { |
35 | if (instance == null) { | |
36 | instance = new LttngJulAgent(); | |
37 | } | |
38 | return instance; | |
39 | } | |
5b5ffa03 | 40 | |
68a1ef73 AM |
41 | @Override |
42 | public Collection<String> listAvailableEvents() { | |
46070114 | 43 | Set<String> ret = new TreeSet<String>(); |
68a1ef73 AM |
44 | |
45 | List<String> loggersNames = Collections.list(LogManager.getLogManager().getLoggerNames()); | |
46 | for (String name : loggersNames) { | |
47 | /* | |
48 | * Skip the root logger. An empty string is not a valid event name | |
49 | * in LTTng. | |
50 | */ | |
46070114 | 51 | if (name.equals("") || name.equals("global")) { |
68a1ef73 AM |
52 | continue; |
53 | } | |
54 | ||
55 | /* | |
56 | * Check if that logger has at least one LTTng JUL handler attached. | |
57 | */ | |
58 | Logger logger = Logger.getLogger(name); | |
59 | if (hasLttngHandlerAttached(logger)) { | |
60 | ret.add(name); | |
61 | } | |
62 | } | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
67 | private static boolean hasLttngHandlerAttached(Logger logger) { | |
68 | for (Handler handler : logger.getHandlers()) { | |
69 | if (handler instanceof LttngLogHandler) { | |
70 | return true; | |
71 | } | |
72 | } | |
46070114 AM |
73 | |
74 | /* | |
75 | * A parent logger, if any, may be connected to an LTTng handler. In | |
76 | * this case, we will want to include this child logger in the output, | |
77 | * since it will be accessible by LTTng. | |
78 | */ | |
79 | Logger parent = logger.getParent(); | |
80 | if (parent != null) { | |
81 | return hasLttngHandlerAttached(parent); | |
82 | } | |
83 | ||
84 | /* | |
85 | * We have reached the root logger and have not found any LTTng handler, | |
86 | * this event will not be accessible. | |
87 | */ | |
68a1ef73 AM |
88 | return false; |
89 | } | |
90 | ||
5b5ffa03 | 91 | } |