/**
* Copyright (c) 2012, University of Konstanz, Distributed Systems Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the University of Konstanz nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jscsi.initiator.connection.state;
import org.jscsi.exception.InternetSCSIException;
import org.jscsi.initiator.connection.Connection;
import org.jscsi.parser.OperationCode;
import org.jscsi.parser.ProtocolDataUnit;
import org.jscsi.parser.datasegment.OperationalTextKey;
import org.jscsi.parser.snack.SNACKRequestParser;
import org.jscsi.parser.snack.SNACKRequestParser.SNACKType;
/**
* <h1>SNACKRequestState</h1>
* <p/>
* This state handles a SNACK Request.
*
* @author Volker Wildi
*/
public final class SNACKRequestState extends AbstractState {
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
private final IState prevState;
private final int targetTransferTag;
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
/**
* Constructor to create a new, empty <code>SNACKRequestState</code>.
*
* @param initConnection
* This is the connection, which is used for the network
* transmission.
* @param initPrevState
* The <code>IState</code> instance, which was executed before
* this state.
* @param initTargetTransferTag
* The Target Transfer Tag of this state.
*/
public SNACKRequestState(final Connection initConnection, final IState initPrevState,
final int initTargetTransferTag, final int initInitiatorTaskTag) {
// OODRIVE
super(initConnection, initInitiatorTaskTag);
prevState = initPrevState;
targetTransferTag = initTargetTransferTag;
}
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
/** {@inheritDoc} */
public final void execute() throws InternetSCSIException {
final ProtocolDataUnit protocolDataUnit =
protocolDataUnitFactory.create(false, true, OperationCode.SNACK_REQUEST, connection
.getSetting(OperationalTextKey.HEADER_DIGEST), connection
.getSetting(OperationalTextKey.DATA_DIGEST));
// OODRIVE : Initiator task Tag must be set to the reserved value if SNACK type is DATA_ACK
protocolDataUnit.getBasicHeaderSegment().setInitiatorTaskTag(0xffffffff);
final SNACKRequestParser parser =
(SNACKRequestParser)protocolDataUnit.getBasicHeaderSegment().getParser();
parser.setType(SNACKType.DATA_ACK);
parser.setTargetTransferTag(targetTransferTag);
connection.send(protocolDataUnit);
connection.nextState(prevState, initiatorTaskTag);
super.stateFollowing = true;
// return true;
}
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
}