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

   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  * disabled in the tracing session.
  29  *
  30  * @author Alexandre Montplaisir
  31  * @author David Goulet
  32  */
  33 class SessiondDisableEventCommand implements ISessiondCommand {
  34
  35         /** Event name to disable from the tracing session */
  36         private final String eventName;
  37
  38         public SessiondDisableEventCommand(byte[] data) {
  39                 if (data == null) {
  40                         throw new IllegalArgumentException();
  41                 }
  42                 ByteBuffer buf = ByteBuffer.wrap(data);
  43                 buf.order(ByteOrder.LITTLE_ENDIAN);
  44                 eventName = new String(data).trim();
  45         }
  46
  47         @Override
  48         public ILttngAgentResponse execute(AbstractLttngAgent<?> agent) {
  49                 boolean success = agent.eventDisabled(this.eventName);
  50                 return (success ? ILttngAgentResponse.SUCESS_RESPONSE : DISABLE_EVENT_FAILURE_RESPONSE);
  51         }
  52
  53         /**
  54          * Response sent when the disable-event command asks to disable an
  55          * unknown event.
  56          */
  57         private static final ILttngAgentResponse DISABLE_EVENT_FAILURE_RESPONSE = new ILttngAgentResponse() {
  58
  59                 @Override
  60                 public ReturnCode getReturnCode() {
  61                         return ReturnCode.CODE_UNK_LOGGER_NAME;
  62                 }
  63
  64                 @Override
  65                 public byte[] getBytes() {
  66                         byte data[] = new byte[INT_SIZE];
  67                         ByteBuffer buf = ByteBuffer.wrap(data);
  68                         buf.order(ByteOrder.BIG_ENDIAN);
  69                         buf.putInt(getReturnCode().getCode());
  70                         return data;
  71                 }
  72         };
  73 }