Commit | Line | Data |
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5b5ffa03 | 1 | /* |
d60dfbe4 | 2 | * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> |
5b5ffa03 DG |
3 | * |
4 | * This library is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this library; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
d60dfbe4 AM |
18 | package org.lttng.ust.agent.jul; |
19 | ||
68a1ef73 AM |
20 | import java.util.ArrayList; |
21 | import java.util.Collection; | |
22 | import java.util.Collections; | |
23 | import java.util.List; | |
6364bf2d AM |
24 | import java.util.Set; |
25 | import java.util.TreeSet; | |
68a1ef73 AM |
26 | import java.util.logging.Handler; |
27 | import java.util.logging.LogManager; | |
28 | import java.util.logging.Logger; | |
29 | ||
d60dfbe4 AM |
30 | import org.lttng.ust.agent.AbstractLttngAgent; |
31 | ||
32 | /** | |
33 | * Agent implementation for tracing from JUL loggers. | |
34 | * | |
35 | * @author Alexandre Montplaisir | |
36 | */ | |
37 | class LttngJulAgent extends AbstractLttngAgent<LttngLogHandler> { | |
38 | ||
39 | private static LttngJulAgent instance = null; | |
40 | ||
41 | private LttngJulAgent() { | |
42 | super(Domain.JUL); | |
43 | } | |
5b5ffa03 | 44 | |
d60dfbe4 AM |
45 | public static synchronized LttngJulAgent getInstance() { |
46 | if (instance == null) { | |
47 | instance = new LttngJulAgent(); | |
48 | } | |
49 | return instance; | |
50 | } | |
5b5ffa03 | 51 | |
68a1ef73 AM |
52 | @Override |
53 | public Collection<String> listAvailableEvents() { | |
6364bf2d | 54 | Set<String> ret = new TreeSet<String>(); |
68a1ef73 AM |
55 | |
56 | List<String> loggersNames = Collections.list(LogManager.getLogManager().getLoggerNames()); | |
57 | for (String name : loggersNames) { | |
58 | /* | |
59 | * Skip the root logger. An empty string is not a valid event name | |
60 | * in LTTng. | |
61 | */ | |
6364bf2d | 62 | if (name.equals("") || name.equals("global")) { |
68a1ef73 AM |
63 | continue; |
64 | } | |
65 | ||
66 | /* | |
67 | * Check if that logger has at least one LTTng JUL handler attached. | |
68 | */ | |
69 | Logger logger = Logger.getLogger(name); | |
70 | if (hasLttngHandlerAttached(logger)) { | |
71 | ret.add(name); | |
72 | } | |
73 | } | |
74 | ||
75 | return ret; | |
76 | } | |
77 | ||
78 | private static boolean hasLttngHandlerAttached(Logger logger) { | |
79 | for (Handler handler : logger.getHandlers()) { | |
80 | if (handler instanceof LttngLogHandler) { | |
81 | return true; | |
82 | } | |
83 | } | |
6364bf2d AM |
84 | |
85 | /* | |
86 | * A parent logger, if any, may be connected to an LTTng handler. In | |
87 | * this case, we will want to include this child logger in the output, | |
88 | * since it will be accessible by LTTng. | |
89 | */ | |
90 | Logger parent = logger.getParent(); | |
91 | if (parent != null) { | |
92 | return hasLttngHandlerAttached(parent); | |
93 | } | |
94 | ||
95 | /* | |
96 | * We have reached the root logger and have not found any LTTng handler, | |
97 | * this event will not be accessible. | |
98 | */ | |
68a1ef73 AM |
99 | return false; |
100 | } | |
101 | ||
5b5ffa03 | 102 | } |