org.eclipse.tracecompass.lttng2.control.core/src/org/eclipse/tracecompass/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.tracecompass.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  */
  24 public class ViewerCommand implements IRelayCommand {
  25
  26     /**
  27      * Command size
  28      *
  29      * fDataSize + fCmdVersion + fCmd
  30      */
  31     public static final int SIZE = (Long.SIZE + Integer.SIZE) / 8 + Command.SIZE;
  32     /**
  33      * data size following this header, you normally attach a payload that one,
  34      * in bytes
  35      */
  36     private final long fDataSize;
  37     /** enum lttcomm_relayd_command */
  38     private final Command fCmd;
  39     /** command version */
  40     private final int fCmdVersion;
  41
  42     /**
  43      * Sets the packet command
  44      *
  45      * @param viewerConnect
  46      *            the command
  47      * @param size size of the command
  48      * @param version the version number
  49      */
  50     public ViewerCommand(Command viewerConnect, long size, int version) {
  51         fCmd = viewerConnect;
  52         fDataSize = size;
  53         fCmdVersion = version;
  54     }
  55
  56     /**
  57      * Get the data size
  58      *
  59      * @return the DataSize
  60      */
  61     public long getDataSize() {
  62         return fDataSize;
  63     }
  64
  65     /**
  66      * Get the command
  67      *
  68      * @return the Cmd
  69      */
  70     public Command getCmd() {
  71         return fCmd;
  72     }
  73
  74     /**
  75      * Get the command version
  76      *
  77      * @return the CmdVersion
  78      */
  79     public int getCmdVersion() {
  80         return fCmdVersion;
  81     }
  82
  83     @Override
  84     public byte[] serialize() {
  85         byte data[] = new byte[SIZE];
  86         ByteBuffer bb = ByteBuffer.wrap(data);
  87         bb.order(ByteOrder.BIG_ENDIAN);
  88         bb.putLong(getDataSize());
  89         bb.putInt(getCmd().getCommand());
  90         bb.putInt(fCmdVersion);
  91         return data;
  92     }
  93
  94
  95 }