2 * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
3 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
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.
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
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
19 package org
.lttng
.ust
.agent
.client
;
21 import java
.nio
.ByteBuffer
;
22 import java
.nio
.ByteOrder
;
24 import org
.lttng
.ust
.agent
.session
.EventRule
;
25 import org
.lttng
.ust
.agent
.session
.LogLevelSelector
;
28 * Session daemon command indicating to the Java agent that some events were
29 * enabled in the tracing session.
31 * @author Alexandre Montplaisir
32 * @author David Goulet
34 class SessiondEnableEventCommand
implements ISessiondCommand
{
36 /** Fixed event name length. Value defined by the lttng agent protocol. */
37 private static final int EVENT_NAME_LENGTH
= 256;
39 private final boolean commandIsValid
;
41 /* Parameters of the event rule being enabled */
42 private final String eventName
;
43 private final LogLevelSelector logLevelFilter
;
44 private final String filterString
;
46 public SessiondEnableEventCommand(byte[] data
) {
48 throw new IllegalArgumentException();
50 ByteBuffer buf
= ByteBuffer
.wrap(data
);
51 buf
.order(ByteOrder
.LITTLE_ENDIAN
);
52 int logLevel
= buf
.getInt();
53 int logLevelType
= buf
.getInt();
54 logLevelFilter
= new LogLevelSelector(logLevel
, logLevelType
);
56 /* Read the event name */
57 byte[] eventNameBytes
= new byte[EVENT_NAME_LENGTH
];
58 buf
.get(eventNameBytes
);
59 eventName
= new String(eventNameBytes
).trim();
62 * Read the filter string. The buffer contains the length (number of
63 * bytes), then the bytes themselves.
65 * The length is represented as an unsigned int, but it should never
66 * be greater than Integer.MAX_VALUE.
68 int filterStringLength
= buf
.getInt();
69 if (filterStringLength
< 0) {
71 * The (unsigned) length is above what the sessiond should send. The
72 * command cannot be processed.
75 commandIsValid
= false;
78 if (filterStringLength
== 0) {
79 /* There is explicitly no filter string */
81 commandIsValid
= true;
85 byte[] filterStringBytes
= new byte[filterStringLength
];
86 buf
.get(filterStringBytes
);
87 filterString
= new String(filterStringBytes
).trim();
89 commandIsValid
= true;
93 public LttngAgentResponse
execute(ILttngTcpClientListener agent
) {
94 if (!commandIsValid
) {
95 return LttngAgentResponse
.FAILURE_RESPONSE
;
98 EventRule rule
= new EventRule(eventName
, logLevelFilter
, filterString
);
99 boolean success
= agent
.eventEnabled(rule
);
100 return (success ? LttngAgentResponse
.SUCESS_RESPONSE
: LttngAgentResponse
.FAILURE_RESPONSE
);