1 /**
2 * Copyright (c) 2012, University of Konstanz, Distributed Systems Group All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
5 * following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of
6 * conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice,
7 * this list of conditions and the following disclaimer in the documentation and/or other materials provided with the
8 * distribution. * Neither the name of the University of Konstanz nor the names of its contributors may be used to
9 * endorse or promote products derived from this software without specific prior written permission.
10 *
11 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
12 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13 * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
14 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
15 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
16 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
17 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
18 */
19 package org.jscsi.initiator.connection.state;
20
21
22 import org.jscsi.exception.InternetSCSIException;
23 import org.jscsi.initiator.connection.Connection;
24 import org.jscsi.parser.OperationCode;
25 import org.jscsi.parser.ProtocolDataUnit;
26 import org.jscsi.parser.datasegment.OperationalTextKey;
27 import org.jscsi.parser.snack.SNACKRequestParser;
28 import org.jscsi.parser.snack.SNACKRequestParser.SNACKType;
29
30
31 /**
32 * <h1>SNACKRequestState</h1>
33 * <p/>
34 * This state handles a SNACK Request.
35 *
36 * @author Volker Wildi
37 */
38 public final class SNACKRequestState extends AbstractState {
39
40 // --------------------------------------------------------------------------
41 // --------------------------------------------------------------------------
42
43 private final IState prevState;
44
45 private final int targetTransferTag;
46
47 // --------------------------------------------------------------------------
48 // --------------------------------------------------------------------------
49
50 /**
51 * Constructor to create a new, empty <code>SNACKRequestState</code>.
52 *
53 * @param initConnection This is the connection, which is used for the network transmission.
54 * @param initPrevState The <code>IState</code> instance, which was executed before this state.
55 * @param initTargetTransferTag The Target Transfer Tag of this state.
56 */
57 public SNACKRequestState (final Connection initConnection, final IState initPrevState, final int initTargetTransferTag) {
58
59 super(initConnection);
60 prevState = initPrevState;
61 targetTransferTag = initTargetTransferTag;
62 }
63
64 // --------------------------------------------------------------------------
65 // --------------------------------------------------------------------------
66
67 /** {@inheritDoc} */
68 public final void execute () throws InternetSCSIException {
69
70 final ProtocolDataUnit protocolDataUnit = protocolDataUnitFactory.create(false, true, OperationCode.SNACK_REQUEST, connection.getSetting(OperationalTextKey.HEADER_DIGEST), connection.getSetting(OperationalTextKey.DATA_DIGEST));
71
72 final SNACKRequestParser parser = (SNACKRequestParser) protocolDataUnit.getBasicHeaderSegment().getParser();
73 parser.setType(SNACKType.DATA_ACK);
74 parser.setTargetTransferTag(targetTransferTag);
75
76 connection.send(protocolDataUnit);
77 connection.nextState(prevState);
78 super.stateFollowing = true;
79 // return true;
80 }
81
82 // --------------------------------------------------------------------------
83 // --------------------------------------------------------------------------
84 // --------------------------------------------------------------------------
85 // --------------------------------------------------------------------------
86
87 }