DevRole Class Reference

This class seeks to provide simple bitfield type-checking of a device in a fabric so that I can use type-specific actions in a dependent project. More...

Collaboration diagram for DevRole:

Public Member Functions
boolean	isA (DevRole proto)
	return true if the device is an instance of the other. More...
boolean	isA (int proto)
	return true if the device is an instance of the other. More...

Static Public Member Functions
static int	max ()
	convenience accessor for this.max More...

Data Fields
final int	value
	what bit-field is this constant?

Static Public Attributes
static final DevRole	INITIATOR = new DevRole()
	a device that initiates a storage request: a server, or a Storage Virtualizer port that talks to backing storage
static final DevRole	SWITCH = new DevRole()
	a device that routes/passes traffic: Switch, NPV device/back-of-rack, FCR
static final DevRole	TARGET = new DevRole()
	a device that offers storage via >1 LUNs ; contrast a TAPE offers only one LUN

Private Member Functions
	DevRole ()
	create a new constant, but private to stop extensions or descendents

Static Private Attributes
static int	max = 1
	global singleton to keep track of the max DevRole.value so far

Detailed Description

This class seeks to provide simple bitfield type-checking of a device in a fabric so that I can use type-specific actions in a dependent project.

By using this class to lift the assumption that all known devices are Targets, I can create additional possible matches that can be additionally checked when asked for more than default target types. This lets me later package the logic of subparts of a device (WWNN and WWPN) into the device logic itself, packaging up in a single place and avoiding needless diuplication without significantly stressing this model

See also

http://www.javaworld.com/article/2076970/core-java/create-enumerated-constants-in-java.html

Definition at line 18 of file DevRole.java.

Member Function Documentation

boolean isA ( DevRole  proto )

inline

return true if the device is an instance of the other.

For example: if (theTapeDevice.isA(TAPE)) {...}

Parameters

proto

device to compare to

Returns

whether device is an instance

Definition at line 37 of file DevRole.java.

References DevRole.value.

boolean isA ( int  proto )

inline

return true if the device is an instance of the other.

For example: if (theTapeDevice.isA(TAPE)) {...}

Parameters

proto

device to compare to

Returns

whether device is an instance

Definition at line 49 of file DevRole.java.

static int max ( )

inlinestatic

convenience accessor for this.max

Returns

DevRole::max

< report highest left-shift bit value ever created; someDevice.value == (someDevice.value & (max()-1))

Definition at line 59 of file DevRole.java.

Referenced by DevRole.DevRole().

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The documentation for this class was generated from the following file:

• java/DevRole.java