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501f6777 CB |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
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 | ||
18 | package org.lttng.ust.agent; | |
19 | ||
20 | import org.lttng.ust.agent.jul.LTTngJUL; | |
21 | ||
22 | import java.io.IOException; | |
23 | import java.io.InputStream; | |
24 | import java.io.BufferedReader; | |
25 | import java.io.FileReader; | |
26 | import java.util.concurrent.Semaphore; | |
27 | import java.util.concurrent.TimeUnit; | |
28 | import java.util.Enumeration; | |
29 | import java.lang.reflect.InvocationTargetException; | |
30 | ||
31 | import java.util.logging.Logger; | |
32 | import java.util.logging.FileHandler;; | |
33 | import java.util.logging.SimpleFormatter; | |
34 | ||
35 | public class LTTngAgent { | |
36 | /* Domains */ | |
37 | static enum Domain { | |
38 | JUL(3), LOG4J(4); | |
39 | private int value; | |
40 | ||
41 | private Domain(int value) { | |
42 | this.value = value; | |
43 | } | |
44 | ||
45 | public int value() { | |
46 | return value; | |
47 | } | |
48 | } | |
49 | ||
50 | private static LogFramework julUser; | |
51 | private static LogFramework julRoot; | |
52 | private static LogFramework log4jUser; | |
53 | private static LogFramework log4jRoot; | |
54 | ||
55 | /* Sessiond clients */ | |
56 | private static LTTngTCPSessiondClient julUserClient; | |
57 | private static LTTngTCPSessiondClient julRootClient; | |
58 | private static LTTngTCPSessiondClient log4jUserClient; | |
59 | private static LTTngTCPSessiondClient log4jRootClient; | |
60 | ||
61 | private static Thread sessiondThreadJULUser; | |
62 | private static Thread sessiondThreadJULRoot; | |
63 | private static Thread sessiondThreadLog4jUser; | |
64 | private static Thread sessiondThreadLog4jRoot; | |
65 | ||
66 | private boolean useJUL = false; | |
67 | private boolean useLog4j = false; | |
68 | ||
69 | /* Singleton agent object */ | |
70 | private static LTTngAgent curAgent = null; | |
71 | ||
72 | /* Indicate if this object has been initialized. */ | |
73 | private static boolean initialized = false; | |
74 | ||
75 | private static Semaphore registerSem; | |
76 | private final static int semTimeout = 3; /* Seconds */ | |
77 | ||
78 | /* | |
79 | * Constructor is private. This is a singleton and a reference should be | |
80 | * acquired using getLTTngAgent(). | |
81 | */ | |
82 | private LTTngAgent() throws IOException { | |
83 | initAgentJULClasses(); | |
84 | ||
85 | /* Since Log4j is a 3rd party JAR, we need to check if we can load any of its classes */ | |
86 | Boolean log4jLoaded = loadLog4jClasses(); | |
87 | if (log4jLoaded) { | |
88 | initAgentLog4jClasses(); | |
89 | } | |
90 | ||
91 | this.registerSem = new Semaphore(0, true); | |
92 | } | |
93 | ||
94 | private Boolean loadLog4jClasses() { | |
95 | Boolean loaded = false; | |
96 | try { | |
97 | ClassLoader loader = ClassLoader.getSystemClassLoader(); | |
98 | loader.loadClass("org.apache.log4j.Logger"); | |
99 | loaded = true; | |
100 | } catch (ClassNotFoundException e) { | |
101 | /* Log4j classes not found, no need to create the relevant objects */ | |
102 | loaded = false; | |
103 | } | |
104 | ||
105 | return loaded; | |
106 | } | |
107 | ||
108 | private void initAgentJULClasses() { | |
109 | try { | |
110 | ClassLoader loader = ClassLoader.getSystemClassLoader(); | |
111 | Class<?> lttngJUL = loader.loadClass("org.lttng.ust.agent.jul.LTTngJUL"); | |
112 | this.julUser = (LogFramework)lttngJUL.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(false); | |
113 | this.julRoot = (LogFramework)lttngJUL.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(true); | |
114 | this.useJUL = true; | |
115 | } catch (ClassNotFoundException e) { | |
116 | /* LTTng JUL classes not found, no need to create the relevant objects */ | |
117 | this.useJUL = false; | |
118 | } catch (InstantiationException e) { | |
119 | this.useJUL = false; | |
120 | } catch (NoSuchMethodException e) { | |
121 | this.useJUL = false; | |
122 | } catch (IllegalAccessException e) { | |
123 | this.useJUL = false; | |
124 | } catch (InvocationTargetException e) { | |
125 | this.useJUL = false; | |
126 | } | |
127 | } | |
128 | ||
129 | private void initAgentLog4jClasses() { | |
130 | try { | |
131 | ClassLoader loader = ClassLoader.getSystemClassLoader(); | |
132 | Class<?> lttngLog4j = loader.loadClass("org.lttng.ust.agent.log4j.LTTngLog4j"); | |
133 | this.log4jUser = (LogFramework)lttngLog4j.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(false); | |
134 | this.log4jRoot = (LogFramework)lttngLog4j.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(true); | |
135 | this.useLog4j = true; | |
136 | } catch (ClassNotFoundException e) { | |
137 | /* LTTng Log4j classes not found, no need to create the relevant objects */ | |
138 | this.useLog4j = false; | |
139 | } catch (InstantiationException e) { | |
140 | this.useLog4j = false; | |
141 | } catch (NoSuchMethodException e) { | |
142 | this.useLog4j = false; | |
143 | } catch (IllegalAccessException e) { | |
144 | this.useLog4j = false; | |
145 | } catch (InvocationTargetException e) { | |
146 | this.useLog4j = false; | |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
151 | * Public getter to acquire a reference to this singleton object. | |
152 | */ | |
153 | public static synchronized LTTngAgent getLTTngAgent() throws IOException { | |
154 | if (curAgent == null) { | |
155 | curAgent = new LTTngAgent(); | |
156 | curAgent.init(); | |
157 | } | |
158 | ||
159 | return curAgent; | |
160 | } | |
161 | ||
162 | private synchronized void init() throws SecurityException, IOException { | |
163 | if (this.initialized) { | |
164 | return; | |
165 | } | |
166 | ||
167 | Integer numJULThreads = 0; | |
168 | Integer numLog4jThreads = 0; | |
169 | ||
170 | if (this.useJUL) { | |
171 | numJULThreads = initJULClientThreads(); | |
172 | } | |
173 | ||
174 | if (this.useLog4j) { | |
175 | numLog4jThreads = initLog4jClientThreads(); | |
176 | } | |
177 | ||
178 | Integer numThreads = numJULThreads + numLog4jThreads; | |
179 | ||
180 | /* Wait for each registration to end. */ | |
181 | try { | |
182 | this.registerSem.tryAcquire(numThreads, | |
183 | semTimeout, | |
184 | TimeUnit.SECONDS); | |
185 | } catch (InterruptedException e) { | |
186 | e.printStackTrace(); | |
187 | } | |
188 | ||
189 | this.initialized = true; | |
190 | } | |
191 | ||
192 | private synchronized Integer initJULClientThreads() { | |
193 | Integer numThreads = 2; | |
194 | ||
195 | /* Handle user session daemon if any. */ | |
196 | this.julUserClient = new LTTngTCPSessiondClient(Domain.JUL, | |
197 | this.julUser, | |
198 | this.registerSem); | |
199 | ||
200 | String userThreadName = "LTTng UST agent JUL user thread"; | |
201 | this.sessiondThreadJULUser = new Thread(julUserClient, userThreadName); | |
202 | this.sessiondThreadJULUser.setDaemon(true); | |
203 | this.sessiondThreadJULUser.start(); | |
204 | ||
205 | /* Handle root session daemon. */ | |
206 | this.julRootClient = new LTTngTCPSessiondClient(Domain.JUL, | |
207 | this.julRoot, | |
208 | this.registerSem); | |
209 | ||
210 | String rootThreadName = "LTTng UST agent JUL root thread"; | |
211 | this.sessiondThreadJULRoot = new Thread(julRootClient, rootThreadName); | |
212 | this.sessiondThreadJULRoot.setDaemon(true); | |
213 | this.sessiondThreadJULRoot.start(); | |
214 | ||
215 | return numThreads; | |
216 | } | |
217 | ||
218 | private synchronized Integer initLog4jClientThreads() { | |
219 | Integer numThreads = 2; | |
220 | ||
221 | this.log4jUserClient = new LTTngTCPSessiondClient(Domain.LOG4J, | |
222 | this.log4jUser, | |
223 | this.registerSem); | |
224 | ||
225 | String userThreadName = "LTTng UST agent Log4j user thread"; | |
226 | this.sessiondThreadLog4jUser = new Thread(log4jUserClient, userThreadName); | |
227 | this.sessiondThreadLog4jUser.setDaemon(true); | |
228 | this.sessiondThreadLog4jUser.start(); | |
229 | ||
230 | this.log4jRootClient = new LTTngTCPSessiondClient(Domain.LOG4J, | |
231 | this.log4jRoot, | |
232 | this.registerSem); | |
233 | ||
234 | String rootThreadName = "LTTng UST agent Log4j root thread"; | |
235 | this.sessiondThreadLog4jRoot = new Thread(log4jRootClient,rootThreadName); | |
236 | this.sessiondThreadLog4jRoot.setDaemon(true); | |
237 | this.sessiondThreadLog4jRoot.start(); | |
238 | ||
239 | return numThreads; | |
240 | } | |
241 | ||
242 | ||
243 | public void dispose() throws IOException { | |
244 | if (this.useJUL) { | |
245 | this.julUserClient.destroy(); | |
246 | this.julRootClient.destroy(); | |
247 | this.julUser.reset(); | |
248 | this.julRoot.reset(); | |
249 | } | |
250 | ||
251 | if (this.useLog4j) { | |
252 | this.log4jUserClient.destroy(); | |
253 | this.log4jRootClient.destroy(); | |
254 | this.log4jUser.reset(); | |
255 | this.log4jRoot.reset(); | |
256 | } | |
257 | ||
258 | try { | |
259 | if (this.useJUL) { | |
260 | this.sessiondThreadJULUser.join(); | |
261 | this.sessiondThreadJULRoot.join(); | |
262 | } | |
263 | ||
264 | if (this.useLog4j) { | |
265 | this.sessiondThreadLog4jUser.join(); | |
266 | this.sessiondThreadLog4jRoot.join(); | |
267 | } | |
268 | ||
269 | } catch (InterruptedException e) { | |
270 | e.printStackTrace(); | |
271 | } | |
272 | } | |
273 | } |