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 /**
  25  * Session daemon command indicating to the Java agent that some events were
  26  * disabled in the tracing session.
  27  *
  28  * @author Alexandre Montplaisir
  29  * @author David Goulet
  30  */
  31 class SessiondDisableEventCommand extends SessiondCommand {
  32
  33         /** Event name to disable from the tracing session */
  34         private final String eventName;
  35
  36         public SessiondDisableEventCommand(byte[] data) {
  37                 if (data == null) {
  38                         throw new IllegalArgumentException();
  39                 }
  40                 ByteBuffer buf = ByteBuffer.wrap(data);
  41                 buf.order(ByteOrder.BIG_ENDIAN);
  42                 eventName = new String(data, SESSIOND_PROTOCOL_CHARSET).trim();
  43         }
  44
  45         @Override
  46         public LttngAgentResponse execute(ILttngTcpClientListener agent) {
  47                 boolean success = agent.eventDisabled(this.eventName);
  48                 return (success ? LttngAgentResponse.SUCESS_RESPONSE : DISABLE_EVENT_FAILURE_RESPONSE);
  49         }
  50
  51         /**
  52          * Response sent when the disable-event command asks to disable an
  53          * unknown event.
  54          */
  55         private static final LttngAgentResponse DISABLE_EVENT_FAILURE_RESPONSE = new LttngAgentResponse() {
  56                 @Override
  57                 public ReturnCode getReturnCode() {
  58                         return ReturnCode.CODE_UNKNOWN_LOGGER_NAME;
  59                 }
  60         };
  61 }