liblttng-ust-java-agent/java/lttng-ust-agent-common/org/lttng/ust/agent/client/SessiondListLoggersResponse.java

   1 /*
   2  * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This library is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU Lesser General Public License, version 2.1 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This library is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
  11  * for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this library; if not, write to the Free Software Foundation,
  15  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  16  */
  17
  18 package org.lttng.ust.agent.client;
  19
  20 import java.nio.ByteBuffer;
  21 import java.nio.ByteOrder;
  22 import java.util.ArrayList;
  23 import java.util.List;
  24
  25 import org.lttng.ust.agent.ILttngAgent;
  26
  27 class SessiondListLoggersResponse implements ISessiondResponse {
  28
  29         private final static int SIZE = 12;
  30
  31         private int dataSize = 0;
  32         private int nbLogger = 0;
  33
  34         private final List<String> loggerList = new ArrayList<String>();
  35
  36         /** Return status code to the session daemon. */
  37         public LttngAgentRetCode code;
  38
  39         @Override
  40         public byte[] getBytes() {
  41                 byte data[] = new byte[SIZE + dataSize];
  42                 ByteBuffer buf = ByteBuffer.wrap(data);
  43                 buf.order(ByteOrder.BIG_ENDIAN);
  44
  45                 /* Returned code */
  46                 buf.putInt(code.getCode());
  47                 buf.putInt(dataSize);
  48                 buf.putInt(nbLogger);
  49
  50                 for (String logger : loggerList) {
  51                         buf.put(logger.getBytes());
  52                         /* NULL terminated byte after the logger name. */
  53                         buf.put((byte) 0x0);
  54                 }
  55                 return data;
  56         }
  57
  58         public void execute(ILttngAgent<?> agent) {
  59                 for (String event : agent.listEnabledEvents()) {
  60                         this.loggerList.add(event);
  61                         this.nbLogger++;
  62                         this.dataSize += event.length() + 1;
  63                 }
  64
  65                 this.code = LttngAgentRetCode.CODE_SUCCESS_CMD;
  66         }
  67 }