| 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 | |
| 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 |
| 36 | public LttngAgentResponse execute(ILttngTcpClientListener agent) { |
| 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 | |
| 48 | private static class SessiondListLoggersResponse extends LttngAgentResponse { |
| 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 */ |
| 63 | return ReturnCode.CODE_SUCCESS_CMD; |
| 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 | } |