org.jscsi.target.connection.stage.fullfeature

Class PingStage

java.lang.Object

org.jscsi.target.connection.stage.TargetStage

org.jscsi.target.connection.stage.fullfeature.TargetFullFeatureStage

org.jscsi.target.connection.stage.fullfeature.PingStage

public class PingStage
extends TargetFullFeatureStage

A stage for processing NOP-Out PDUs, which are used by the initiator for pinging the target, making sure that the connection is still up.

The execute(ProtocolDataUnit) method will process these ping messages and send a NOP-In PDU as ping echo, containing a copy of the NOP-Out PDU's data segment.

If either the NOP-OUT PDU's initiator or target transfer tag equals the reserved value of 0xffffffff, then no reply will be sent, since the PDU is only supposed to acknowledge a changed ExpCmdSN, or serve as an echo to a NOP-IN ping sent by the target.

Author:

Andreas Ergenzinger

Field Summary

Fields inherited from class org.jscsi.target.connection.stage.TargetStage

connection, session, settings, targetPhase

Constructor Summary

Constructors

Constructor and Description
PingStage(TargetFullFeaturePhase targetFullFeaturePhase)

Method Summary

Methods

Modifier and Type	Method and Description
void	execute(ProtocolDataUnit pdu) Starts the stage.

Methods inherited from class org.jscsi.target.connection.stage.fullfeature.TargetFullFeatureStage

createFixedFormatErrorPdu, createFixedFormatErrorPdu, createScsiResponsePdu, sendResponse

Methods inherited from class org.jscsi.target.connection.stage.TargetStage

getConnection

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PingStage

public PingStage(TargetFullFeaturePhase targetFullFeaturePhase)

Method Detail

execute

public void execute(ProtocolDataUnit pdu)
             throws IOException,
                    InterruptedException,
                    InternetSCSIException,
                    DigestException,
                    SettingsException

Description copied from class: TargetStage

Starts the stage. This method contains the operational logic required for the receiving, processing and sending of PDUs which is needed to successfully complete the represented iSCSI stage.

Specified by:

execute in class TargetStage

Parameters:

pdu - the first ProtocolDataUnit to be processed in the stage

Throws:

IOException - if the connection was closed unexpectedly

InterruptedException

InternetSCSIException - if a PDU has violated the iSCSI standard

DigestException - if a digest error was detected

SettingsException - if the program has attempted to access a value from settings which has not been negotiated and which does not have a default value