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
;
23 import java
.util
.Collection
;
26 * Session daemon command asking the Java agent to list its registered loggers,
27 * which corresponds to event names in the tracing session.
29 * @author Alexandre Montplaisir
30 * @author David Goulet
32 class SessiondListLoggersCommand
extends SessiondCommand
{
35 public LttngAgentResponse
execute(ILttngTcpClientListener agent
) {
36 final Collection
<String
> loggerList
= agent
.listAvailableEvents();
37 return new SessiondListLoggersResponse(loggerList
);
40 private static class SessiondListLoggersResponse
extends LttngAgentResponse
{
42 private final static int SIZE
= 12;
44 private final Collection
<String
> loggers
;
46 public SessiondListLoggersResponse(Collection
<String
> loggers
) {
47 this.loggers
= loggers
;
51 public ReturnCode
getReturnCode() {
52 /* This command can't really fail */
53 return ReturnCode
.CODE_SUCCESS_CMD
;
57 public byte[] getBytes() {
59 * Compute the data size, which is the number of bytes of each
60 * encoded string, +1 per string for the \0
63 for (String logger
: loggers
) {
64 dataSize
+= logger
.getBytes(SESSIOND_PROTOCOL_CHARSET
).length
+ 1;
67 /* Prepare the buffer */
68 byte data
[] = new byte[SIZE
+ dataSize
];
69 ByteBuffer buf
= ByteBuffer
.wrap(data
);
70 buf
.order(ByteOrder
.BIG_ENDIAN
);
72 /* Write the header section of the response */
73 buf
.putInt(getReturnCode().getCode());
75 buf
.putInt(loggers
.size());
77 /* Write the payload */
78 for (String logger
: loggers
) {
79 buf
.put(logger
.getBytes(SESSIOND_PROTOCOL_CHARSET
));
80 /* NULL terminated byte after the logger name. */