| 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.AbstractLttngAgent; |
| 25 | |
| 26 | /** |
| 27 | * Session daemon command indicating to the Java agent that some events were |
| 28 | * enabled in the tracing session. |
| 29 | * |
| 30 | * @author Alexandre Montplaisir |
| 31 | * @author David Goulet |
| 32 | */ |
| 33 | class SessiondEnableEventCommand implements ISessiondCommand { |
| 34 | |
| 35 | private static final int INT_SIZE = 4; |
| 36 | |
| 37 | /** Event name to enable in the tracing session */ |
| 38 | private final String eventName; |
| 39 | |
| 40 | public SessiondEnableEventCommand(byte[] data) { |
| 41 | if (data == null) { |
| 42 | throw new IllegalArgumentException(); |
| 43 | } |
| 44 | int dataOffset = INT_SIZE * 2; |
| 45 | |
| 46 | ByteBuffer buf = ByteBuffer.wrap(data); |
| 47 | buf.order(ByteOrder.LITTLE_ENDIAN); |
| 48 | buf.getInt(); // logLevel, currently unused |
| 49 | buf.getInt(); // logLevelType, currently unused |
| 50 | eventName = new String(data, dataOffset, data.length - dataOffset).trim(); |
| 51 | } |
| 52 | |
| 53 | @Override |
| 54 | public LttngAgentResponse execute(AbstractLttngAgent<?> agent) { |
| 55 | boolean success = agent.eventEnabled(this.eventName); |
| 56 | return (success ? LttngAgentResponse.SUCESS_RESPONSE : LttngAgentResponse.FAILURE_RESPONSE); |
| 57 | } |
| 58 | } |