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Java > Open Source Codes > com > db4o > cs > messages > MReadBytes


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 package com.db4o.cs.messages;
22
23 import com.db4o.*;
24 import com.db4o.cs.*;
25
26 public final class MReadBytes extends MsgD {
27     
28     public final YapReader getByteLoad() {
29         int address = _payLoad.readInt();
30         int length = _payLoad.getLength() - (YapConst.INT_LENGTH);
31         _payLoad.removeFirstBytes(YapConst.INT_LENGTH);
32         _payLoad.useSlot(address, length);
33         return this._payLoad;
34     }
35
36     public final MsgD getWriter(YapWriter bytes) {
37         MsgD message = getWriterForLength(bytes.getTransaction(), bytes.getLength() + YapConst.INT_LENGTH);
38         message._payLoad.writeInt(bytes.getAddress());
39         message._payLoad.append(bytes._buffer);
40         return message;
41     }
42     
43     public final boolean processAtServer(YapServerThread serverThread) {
44         int address = readInt();
45         int length = readInt();
46         synchronized (streamLock()) {
47             YapWriter bytes =
48                 new YapWriter(this.transaction(), address, length);
49             try {
50                 stream().readBytes(bytes._buffer, address, length);
51                 serverThread.write(getWriter(bytes));
52             } catch (Exception JavaDoc e) {
53                 // TODO: not nicely handled on the client side yet
54 serverThread.write(Msg.NULL);
55             }
56         }
57         return true;
58     }
59 }
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