org.eclipse.linuxtools.lttng2.control.core/src/org/eclipse/linuxtools/internal/lttng2/control/core/relayd/lttngviewerCommands/MetadataPacketResponse.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.io.DataInputStream;
  17 import java.io.IOException;
  18 import java.nio.ByteBuffer;
  19 import java.nio.ByteOrder;
  20
  21 /**
  22  * Metadata packet response containing a packet of metadata
  23  *
  24  * @author Matthew Khouzam
  25  * @since 3.0
  26  */
  27 public class MetadataPacketResponse implements IRelayResponse {
  28
  29     /**
  30      * Response size
  31      *
  32      * fData.length + fStatus
  33      */
  34     private static final int SIZE = (Long.SIZE + Integer.SIZE) / 8;
  35     /** status of the metadata request */
  36     private final GetMetadataReturnCode fStatus;
  37     /** the packet */
  38     private final byte fData[];
  39
  40     /**
  41      * Read new metadata packet from the network
  42      *
  43      * @param inNet
  44      *            network input reader
  45      * @throws IOException
  46      *             network error
  47      */
  48     public MetadataPacketResponse(DataInputStream inNet) throws IOException {
  49         byte[] data = new byte[SIZE];
  50         inNet.readFully(data);
  51         ByteBuffer bb = ByteBuffer.wrap(data);
  52         bb.order(ByteOrder.BIG_ENDIAN);
  53         long length = bb.getLong();
  54         fStatus = GetMetadataReturnCode.values()[bb.getInt() - 1];
  55         if (length >= Integer.MAX_VALUE) {
  56             throw new IOException("Metadata Packet too big " + length); //$NON-NLS-1$
  57         }
  58         fData = new byte[(int) length];
  59         inNet.readFully(fData);
  60     }
  61
  62     /**
  63      * Get the packet
  64      *
  65      * @return the packet
  66      */
  67     public byte[] getData() {
  68         return fData;
  69     }
  70
  71     /**
  72      * Gets the status
  73      *
  74      * @return the status
  75      */
  76     public GetMetadataReturnCode getStatus() {
  77         return fStatus;
  78     }
  79 }