org.eclipse.tracecompass.lttng2.control.core/src/org/eclipse/tracecompass/internal/lttng2/control/core/relayd/commands/AttachSessionRequest.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.commands;
  15
  16 import java.nio.ByteBuffer;
  17 import java.nio.ByteOrder;
  18
  19 /**
  20  * VIEWER_ATTACH_SESSION payload.
  21  *
  22  * @author Matthew Khouzam
  23  */
  24 public class AttachSessionRequest implements IRelayCommand {
  25
  26     /**
  27      * Command size
  28      *
  29      * fSessionId + fOffset + fSeek
  30      */
  31     public static final int SIZE = (Long.SIZE + Long.SIZE) / 8 + SeekCommand.SIZE;
  32     /** the id of a session */
  33     private final long fSessionId;
  34     /** unused for now */
  35     private final long fOffset;
  36     /** enum lttng_viewer_seek */
  37     private final SeekCommand fSeek;
  38
  39     /**
  40      * Attach session request constructor
  41      *
  42      * @param id
  43      *            the session id
  44      * @param seekCommand
  45      *            the seek command
  46      */
  47     public AttachSessionRequest(long id, SeekCommand seekCommand) {
  48         this(id, 0, seekCommand);
  49     }
  50
  51     /**
  52      * Attach session request constructor
  53      *
  54      * @param id
  55      *            the session id
  56      * @param offset
  57      *            unused for now
  58      * @param seekCommand
  59      *            the seek command
  60      */
  61
  62     public AttachSessionRequest(long id, int offset, SeekCommand seekCommand) {
  63         fSessionId = id;
  64         fOffset = offset;
  65         fSeek = seekCommand;
  66
  67     }
  68
  69     @Override
  70     public byte[] serialize() {
  71         byte data[] = new byte[SIZE];
  72         ByteBuffer bb = ByteBuffer.wrap(data);
  73         bb.order(ByteOrder.BIG_ENDIAN);
  74         bb.putLong(fSessionId);
  75         bb.putLong(fOffset);
  76         bb.putInt(fSeek.getCommand());
  77         return data;
  78     }
  79
  80 }