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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.log4j; |
19 | ||
68a1ef73 AM |
20 | import java.util.ArrayList; |
21 | import java.util.Collection; | |
22 | import java.util.Collections; | |
23 | import java.util.List; | |
24 | ||
25 | import org.apache.log4j.Appender; | |
26 | import org.apache.log4j.LogManager; | |
27 | import org.apache.log4j.Logger; | |
d60dfbe4 AM |
28 | import org.lttng.ust.agent.AbstractLttngAgent; |
29 | ||
30 | /** | |
31 | * Agent implementation for using the Log4j logger, connecting to a root session | |
32 | * daemon. | |
33 | * | |
34 | * @author Alexandre Montplaisir | |
35 | */ | |
36 | class LttngLog4jAgent extends AbstractLttngAgent<LttngLogAppender> { | |
37 | ||
38 | private static LttngLog4jAgent instance = null; | |
39 | ||
40 | private LttngLog4jAgent() { | |
41 | super(Domain.LOG4J); | |
42 | } | |
5b5ffa03 | 43 | |
d60dfbe4 AM |
44 | public static synchronized LttngLog4jAgent getInstance() { |
45 | if (instance == null) { | |
46 | instance = new LttngLog4jAgent(); | |
47 | } | |
48 | return instance; | |
49 | } | |
5b5ffa03 | 50 | |
68a1ef73 AM |
51 | @Override |
52 | public Collection<String> listAvailableEvents() { | |
53 | List<String> ret = new ArrayList<String>(); | |
54 | ||
55 | @SuppressWarnings("unchecked") | |
56 | List<Logger> loggers = Collections.list(LogManager.getCurrentLoggers()); | |
57 | for (Logger logger : loggers) { | |
58 | /* | |
59 | * Check if that logger has at least one LTTng log4j appender | |
60 | * attached. | |
61 | */ | |
62 | if (hasLttngAppenderAttached(logger)) { | |
63 | ret.add(logger.getName()); | |
64 | } | |
65 | } | |
66 | ||
67 | return ret; | |
68 | } | |
69 | ||
70 | private static boolean hasLttngAppenderAttached(Logger logger) { | |
71 | @SuppressWarnings("unchecked") | |
72 | List<Appender> appenders = Collections.list(logger.getAllAppenders()); | |
73 | for (Appender appender : appenders) { | |
74 | if (appender instanceof LttngLogAppender) { | |
75 | return true; | |
76 | } | |
77 | } | |
78 | return false; | |
79 | } | |
5b5ffa03 | 80 | } |