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301a3ddb AM |
1 | /* |
2 | * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> | |
3 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This library is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public License | |
15 | * along with this library; if not, write to the Free Software Foundation, | |
16 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | package org.lttng.ust.agent.client; | |
20 | ||
21 | import java.nio.ByteBuffer; | |
22 | import java.nio.ByteOrder; | |
23 | import java.util.ArrayList; | |
24 | import java.util.List; | |
25 | ||
301a3ddb AM |
26 | /** |
27 | * Session daemon command asking the Java agent to list its registered loggers, | |
28 | * which corresponds to event names in the tracing session. | |
29 | * | |
30 | * @author Alexandre Montplaisir | |
31 | * @author David Goulet | |
32 | */ | |
33 | class SessiondListLoggersCommand implements ISessiondCommand { | |
34 | ||
35 | @Override | |
3165c2f5 | 36 | public LttngAgentResponse execute(ILttngTcpClientListener agent) { |
301a3ddb AM |
37 | final List<String> loggerList = new ArrayList<String>(); |
38 | int dataSize = 0; | |
39 | ||
40 | for (String event : agent.listEnabledEvents()) { | |
41 | loggerList.add(event); | |
42 | dataSize += event.length() + 1; | |
43 | } | |
44 | ||
45 | return new SessiondListLoggersResponse(loggerList, dataSize); | |
46 | } | |
47 | ||
93253569 | 48 | private static class SessiondListLoggersResponse extends LttngAgentResponse { |
301a3ddb AM |
49 | |
50 | private final static int SIZE = 12; | |
51 | ||
52 | private final List<String> loggers; | |
53 | private final int dataSize; | |
54 | ||
55 | public SessiondListLoggersResponse(List<String> loggers, int dataSize) { | |
56 | this.loggers = loggers; | |
57 | this.dataSize = dataSize; | |
58 | } | |
59 | ||
60 | @Override | |
61 | public ReturnCode getReturnCode() { | |
62 | /* This command can't really fail */ | |
93253569 | 63 | return ReturnCode.CODE_SUCCESS_CMD; |
301a3ddb AM |
64 | } |
65 | ||
66 | @Override | |
67 | public byte[] getBytes() { | |
68 | byte data[] = new byte[SIZE + dataSize]; | |
69 | ByteBuffer buf = ByteBuffer.wrap(data); | |
70 | buf.order(ByteOrder.BIG_ENDIAN); | |
71 | ||
72 | /* Returned code */ | |
73 | buf.putInt(getReturnCode().getCode()); | |
74 | buf.putInt(dataSize); | |
75 | buf.putInt(loggers.size()); | |
76 | ||
77 | for (String logger : loggers) { | |
78 | buf.put(logger.getBytes()); | |
79 | /* NULL terminated byte after the logger name. */ | |
80 | buf.put((byte) 0x0); | |
81 | } | |
82 | return data; | |
83 | } | |
84 | } | |
85 | ||
86 | } |