Class SimpleAssignmentStrategy.BackupStrength

java.lang.Object

com.tangosol.net.partition.SimpleAssignmentStrategy.BackupStrength

Enclosing class:

SimpleAssignmentStrategy

protected static class SimpleAssignmentStrategy.BackupStrength
extends Object

BackupStrength represents a level of "strength" or "resiliency" between the primary and backup owners of a partition. The BackupStrength is used to determine which backup owners could serve as a "strong" backup for a primary owner.

Since:

Coherence 3.7

Author:

rhl 2010.11.08

Field Summary

Fields

Modifier and Type	Field	Description
protected int	m_nStrength	The strength (one of the *_SAFE constants).
protected Set	m_setMachines	The set of machine names.
protected Set	m_setRacks	The set of rack names.
protected Set	m_setSites	The set of site names.
protected static final int	MACHINE_SAFE	Machine-safety (members are on different machines).
protected static final int	NODE_SAFE	Node-safety (members are different).
protected static final int	RACK_SAFE	Rack-safety (members are on different racks).
protected static final int	SITE_SAFE	Site-safety (members are on different sites).

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BackupStrength(int nStrength, Set setSites, Set setRacks, Set setMachines)	Construct a BackupStrength of the specified strength.

Method Summary

Modifier and Type	Method	Description
String	getDescription()	Return a human-readable description string of this backup-strength.
int	getMachineCount()	Return the site count.
int	getRackCount()	Return the rack count.
int	getSiteCount()	Return the site count.
protected SimpleAssignmentStrategy.BackupStrength	getWeaker()	Return the next weakest BackupStrength.
protected boolean	isStrong(Member member1, Member member2)	Return true iff the specified members are mutually "strong".
protected boolean	isWeakest()	Return true iff this is the weakest possible BackupStrength.
String	toString()

Methods inherited from class Object

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

Field Details

NODE_SAFE

protected static final int NODE_SAFE

Node-safety (members are different).

See Also:

• Constant Field Values

MACHINE_SAFE

protected static final int MACHINE_SAFE

Machine-safety (members are on different machines).

See Also:

• Constant Field Values

RACK_SAFE

protected static final int RACK_SAFE

Rack-safety (members are on different racks).

See Also:

• Constant Field Values

SITE_SAFE

protected static final int SITE_SAFE

Site-safety (members are on different sites).

See Also:

• Constant Field Values

m_nStrength

protected int m_nStrength

The strength (one of the *_SAFE constants).

m_setSites

protected Set m_setSites

The set of site names.

m_setRacks

protected Set m_setRacks

The set of rack names.

m_setMachines

protected Set m_setMachines

The set of machine names.

Constructor Details

BackupStrength

protected BackupStrength(int nStrength,
 Set setSites,
 Set setRacks,
 Set setMachines)

Construct a BackupStrength of the specified strength.

Parameters:

nStrength - one of the BackupStrength.*_SAFE constants

setSites - the site names

setRacks - the rack names

setMachines - the machine names

Method Details

getWeaker

protected SimpleAssignmentStrategy.BackupStrength getWeaker()

Return the next weakest BackupStrength.

Returns:

a BackupStrength that is immediately weaker than this

isWeakest

protected boolean isWeakest()

Return true iff this is the weakest possible BackupStrength.

Returns:

true iff this strength is NODE_SAFE

isStrong

protected boolean isStrong(Member member1,
 Member member2)

Return true iff the specified members are mutually "strong".

Parameters:

member1 - the first member to compare

member2 - the second member to compare

Returns:

true iff the specified members are mutually "strong"

getSiteCount

public int getSiteCount()

Return the site count.

Returns:

the site count

getRackCount

public int getRackCount()

Return the rack count.

Returns:

the rack count

getMachineCount

public int getMachineCount()

Return the site count.

Returns:

the site count

getDescription

public String getDescription()

Return a human-readable description string of this backup-strength.

Returns:

a human-readable description string of this backup-strength

toString

public String toString()

Overrides:

toString in class Object