org.jscsi.parser.scsi

Enum SCSICommandParser.TaskAttributes

java.lang.Object

java.lang.Enum<SCSICommandParser.TaskAttributes>

org.jscsi.parser.scsi.SCSICommandParser.TaskAttributes

All Implemented Interfaces:

Serializable, Comparable<SCSICommandParser.TaskAttributes>

Enclosing class:

SCSICommandParser

public static enum SCSICommandParser.TaskAttributes
extends Enum<SCSICommandParser.TaskAttributes>

This enumeration defines all valid types of additional header segments, which are defined by the iSCSI standard (RFC3720).

Value	Meaning
0	Reserved
1	Extended CDB
2	Expected Bidirectional Read Data Length
3 - 63	Reserved

Enum Constant Summary

Enum Constants

Enum Constant and Description
ACA ACA is Auto Contingent Allegiance.
HEAD_OF_QUEUE A command received with a HEAD OF QUEUE TAG message is placed first in the queue, to be executed next.
ORDERED If ORDERED QUEUE TAG messages are used, the target shall execute the commands in the order received with respect to other commands received with ORDERED QUEUE TAG messages.
SIMPLE If only SIMPLE QUEUE TAG messages are used, the target may execute the commands in any order that is deemed desirable within the constraints of the queue management algorithm specified in the control mode page (see [SAM2, 8.3.3.1]).
UNTAGGED Untagged queuing allows a target to accept a command from an initiator for a logical unit or target routine while I/O processes from other initiators are being executed.

Method Summary

Methods

Modifier and Type	Method and Description
byte	value() Returns the value of this enumeration.
static SCSICommandParser.TaskAttributes	valueOf(byte value) Returns the constant defined for the given value.
static SCSICommandParser.TaskAttributes	valueOf(String name) Returns the enum constant of this type with the specified name.
static SCSICommandParser.TaskAttributes[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

UNTAGGED

public static final SCSICommandParser.TaskAttributes UNTAGGED

Untagged queuing allows a target to accept a command from an initiator for a logical unit or target routine while I/O processes from other initiators are being executed. Only one command for each I_T_x nexus shall be accepted at a time.

SIMPLE

public static final SCSICommandParser.TaskAttributes SIMPLE

If only SIMPLE QUEUE TAG messages are used, the target may execute the commands in any order that is deemed desirable within the constraints of the queue management algorithm specified in the control mode page (see [SAM2, 8.3.3.1]).

ORDERED

public static final SCSICommandParser.TaskAttributes ORDERED

If ORDERED QUEUE TAG messages are used, the target shall execute the commands in the order received with respect to other commands received with ORDERED QUEUE TAG messages. All commands received with a SIMPLE QUEUE TAG message prior to a command received with an ORDERED QUEUE TAG message, regardless of initiator, shall be executed before that command with the ORDERED QUEUE TAG message. All commands received with a SIMPLE QUEUE TAG message after a command received with an ORDERED QUEUE TAG message, regardless of initiator, shall be executed after that command with the ORDERED QUEUE TAG message.

HEAD_OF_QUEUE

public static final SCSICommandParser.TaskAttributes HEAD_OF_QUEUE

A command received with a HEAD OF QUEUE TAG message is placed first in the queue, to be executed next. A command received with a HEAD OF QUEUE TAG message shall be executed prior to any queued I/O process. Consecutive commands received with HEAD OF QUEUE TAG messages are executed in a last-in-first-out order.

ACA

public static final SCSICommandParser.TaskAttributes ACA

ACA is Auto Contingent Allegiance.

Method Detail

values

public static SCSICommandParser.TaskAttributes[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (SCSICommandParser.TaskAttributes c : SCSICommandParser.TaskAttributes.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static SCSICommandParser.TaskAttributes valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

value

public final byte value()

Returns the value of this enumeration.

Returns:

The value of this enumeration.

valueOf

public static final SCSICommandParser.TaskAttributes valueOf(byte value)

Returns the constant defined for the given value.

Parameters:

value - The value to search for.

Returns:

The constant defined for the given value. Or null, if this value is not defined by this enumeration.