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1 | /* |
2 | * Copyright (C) 2015, EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | package org.lttng.tools; | |
20 | ||
21 | import static org.lttng.tools.utils.ShellUtils.executeCommand; | |
22 | ||
23 | import java.util.Arrays; | |
24 | import java.util.List; | |
25 | import java.util.UUID; | |
26 | import java.util.stream.Collectors; | |
27 | ||
28 | import org.lttng.tools.utils.ShellUtils; | |
29 | ||
30 | /** | |
31 | * Implementation of {@link ILttngSession} which uses the command-line "lttng" | |
32 | * tool to manipulate the session. Creating an instance will run "lttng create", | |
33 | * close()'ing it will run "lttng destroy". | |
34 | * | |
35 | * @author Alexandre Montplaisir | |
36 | */ | |
37 | class LttngCommandLineSession implements ILttngSession { | |
38 | ||
39 | private final String sessionName; | |
40 | private final Domain domain; | |
41 | ||
42 | private volatile boolean channelCreated = false; | |
43 | ||
44 | /** | |
45 | * Constructor to create a new LTTng tracing session. | |
46 | * | |
47 | * @param sessionName | |
48 | * The name of the session to use. It can be null, in which case | |
49 | * we will provide a unique random name. | |
50 | * @param domain | |
51 | * The tracing domain of this session | |
52 | */ | |
53 | public LttngCommandLineSession(String sessionName, Domain domain) { | |
54 | if (sessionName != null) { | |
55 | this.sessionName = sessionName; | |
56 | } else { | |
57 | this.sessionName = UUID.randomUUID().toString(); | |
58 | } | |
59 | this.domain = domain; | |
60 | ||
61 | /* Create the session in LTTng */ | |
62 | executeCommand(Arrays.asList("lttng", "create", this.sessionName)); | |
63 | } | |
64 | ||
65 | @Override | |
66 | public void close() { | |
67 | /* Destroy the session */ | |
68 | executeCommand(Arrays.asList("lttng", "destroy", sessionName)); | |
69 | // FIXME also delete the trace we generated ? | |
70 | } | |
71 | ||
72 | @Override | |
73 | public boolean enableAllEvents() { | |
74 | channelCreated = true; | |
75 | return executeCommand(Arrays.asList( | |
76 | "lttng", "enable-event", domain.flag(), "-a", "-s", sessionName)); | |
77 | } | |
78 | ||
79 | @Override | |
80 | public boolean enableEvents(String... enabledEvents) { | |
81 | if (enabledEvents == null || enabledEvents.length == 0) { | |
82 | throw new IllegalArgumentException(); | |
83 | } | |
84 | channelCreated = true; | |
85 | return executeCommand(Arrays.asList( | |
86 | "lttng", "enable-event", domain.flag(), | |
87 | Arrays.stream(enabledEvents).collect(Collectors.joining(",")), | |
88 | "-s", sessionName)); | |
89 | } | |
90 | ||
91 | @Override | |
92 | public boolean disableEvents(String... disabledEvents) { | |
93 | if (disabledEvents == null || disabledEvents.length == 0) { | |
94 | throw new IllegalArgumentException(); | |
95 | } | |
96 | return executeCommand(Arrays.asList( | |
97 | "lttng", "disable-event", domain.flag(), | |
98 | Arrays.stream(disabledEvents).collect(Collectors.joining(",")), | |
99 | "-s", sessionName)); | |
100 | } | |
101 | ||
102 | @Override | |
103 | public boolean start() { | |
104 | /* | |
105 | * We have to enable a channel for 'lttng start' to work. However, we | |
106 | * cannot enable a channel directly, see | |
107 | * https://bugs.lttng.org/issues/894 . Instead we will enable an event | |
108 | * we know does not exist | |
109 | */ | |
110 | if (!channelCreated) { | |
111 | enableEvents("non-event"); | |
112 | } | |
113 | return executeCommand(Arrays.asList("lttng", "start", sessionName)); | |
114 | } | |
115 | ||
116 | @Override | |
117 | public boolean stop() { | |
118 | return executeCommand(Arrays.asList("lttng", "stop", sessionName)); | |
119 | } | |
120 | ||
121 | @Override | |
122 | public List<String> view() { | |
123 | return ShellUtils.getOutputFromCommand(true, Arrays.asList("lttng", "view", sessionName)); | |
124 | } | |
125 | } |