| 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 | |
| 24 | import org.lttng.ust.agent.client.ISessiondCommand.CommandType; |
| 25 | |
| 26 | /** |
| 27 | * Header of session daemon commands. |
| 28 | * |
| 29 | * @author Alexandre Montplaisir |
| 30 | * @author David Goulet |
| 31 | */ |
| 32 | class SessiondCommandHeader { |
| 33 | |
| 34 | /** ABI size of command header. */ |
| 35 | public static final int HEADER_SIZE = 16; |
| 36 | |
| 37 | /** Payload size in bytes following this header. */ |
| 38 | private final long dataSize; |
| 39 | |
| 40 | /** Command type. */ |
| 41 | private final CommandType cmd; |
| 42 | |
| 43 | public SessiondCommandHeader(byte[] data) { |
| 44 | ByteBuffer buf = ByteBuffer.wrap(data); |
| 45 | buf.order(ByteOrder.BIG_ENDIAN); |
| 46 | |
| 47 | dataSize = buf.getLong(); |
| 48 | cmd = CommandType.values()[buf.getInt() - 1]; |
| 49 | buf.getInt(); // command version, currently unused |
| 50 | } |
| 51 | |
| 52 | public long getDataSize() { |
| 53 | return dataSize; |
| 54 | } |
| 55 | |
| 56 | public CommandType getCommandType() { |
| 57 | return cmd; |
| 58 | } |
| 59 | } |