org.eclipse.linuxtools.lttng2.control.core/src/org/eclipse/linuxtools/internal/lttng2/control/core/relayd/lttngviewerCommands/ViewerCommand.java

   1 /**********************************************************************
   2  * Copyright (c) 2014 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Matthew Khouzam - Initial implementation and API
  11  *   Marc-Andre Laperle - Initial implementation and API
  12  **********************************************************************/
  13
  14 package org.eclipse.linuxtools.internal.lttng2.control.core.relayd.lttngviewerCommands;
  15
  16 import java.nio.ByteBuffer;
  17 import java.nio.ByteOrder;
  18
  19 /**
  20  * The LTTng command
  21  *
  22  * @author Matthew Khouzam
  23  * @since 3.0
  24  */
  25 public class ViewerCommand implements IRelayCommand {
  26
  27     /**
  28      * Command size
  29      *
  30      * fDataSize + fCmdVersion + fCmd
  31      */
  32     public static final int SIZE = (Long.SIZE + Integer.SIZE) / 8 + Command.SIZE;
  33     /**
  34      * data size following this header, you normally attach a payload that one,
  35      * in bytes
  36      */
  37     private final long fDataSize;
  38     /** enum lttcomm_relayd_command */
  39     private final Command fCmd;
  40     /** command version */
  41     private final int fCmdVersion;
  42
  43     /**
  44      * Sets the packet command
  45      *
  46      * @param viewerConnect
  47      *            the command
  48      * @param size size of the command
  49      * @param version the version number
  50      */
  51     public ViewerCommand(Command viewerConnect, long size, int version) {
  52         fCmd = viewerConnect;
  53         fDataSize = size;
  54         fCmdVersion = version;
  55     }
  56
  57     /**
  58      * Get the data size
  59      *
  60      * @return the DataSize
  61      */
  62     public long getDataSize() {
  63         return fDataSize;
  64     }
  65
  66     /**
  67      * Get the command
  68      *
  69      * @return the Cmd
  70      */
  71     public Command getCmd() {
  72         return fCmd;
  73     }
  74
  75     /**
  76      * Get the command version
  77      *
  78      * @return the CmdVersion
  79      */
  80     public int getCmdVersion() {
  81         return fCmdVersion;
  82     }
  83
  84     @Override
  85     public byte[] serialize() {
  86         byte data[] = new byte[SIZE];
  87         ByteBuffer bb = ByteBuffer.wrap(data);
  88         bb.order(ByteOrder.BIG_ENDIAN);
  89         bb.putLong(getDataSize());
  90         bb.putInt(getCmd().getCommand());
  91         bb.putInt(fCmdVersion);
  92         return data;
  93     }
  94
  95
  96 }