org.jboss.cache.eviction
Class NullEvictionQueue

java.lang.Object
  org.jboss.cache.eviction.NullEvictionQueue

All Implemented Interfaces:

Iterable<NodeEntry>, EvictionQueue

public class NullEvictionQueue
extends Object
implements EvictionQueue

A queue that does nothing.

Author:

Brian Stansberry

Field Summary

static NullEvictionQueue

INSTANCE Singleton instance of this class.

Method Summary

void	addNodeEntry(NodeEntry entry) No-op
void	clear() No-op
boolean	containsNodeEntry(NodeEntry entry) Returns false
NodeEntry	getFirstNodeEntry() Returns null
NodeEntry	getNodeEntry(Fqn fqn) Returns null
NodeEntry	getNodeEntry(String fqn) Returns null
int	getNumberOfElements() Returns 0
int	getNumberOfNodes() Returns 0
Iterator<NodeEntry>	iterator() Returns an Iterator whose hasNext() returns false.
void	modifyElementCount(int difference) No-op
void	removeNodeEntry(NodeEntry entry) No-op

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final NullEvictionQueue INSTANCE

Singleton instance of this class.

Method Detail

addNodeEntry

public void addNodeEntry(NodeEntry entry)

No-op

Specified by:

addNodeEntry in interface EvictionQueue

Parameters:

entry - The NodeEntry to add to queue.

clear

public void clear()

No-op

Specified by:

clear in interface EvictionQueue

containsNodeEntry

public boolean containsNodeEntry(NodeEntry entry)

Returns false

Specified by:

containsNodeEntry in interface EvictionQueue

Parameters:

entry - NodeEntry to check for existence in queue.

Returns:

true/false if NodeEntry exists in queue.

getFirstNodeEntry

public NodeEntry getFirstNodeEntry()

Returns null

Specified by:

getFirstNodeEntry in interface EvictionQueue

Returns:

first NodeEntry in queue.

getNodeEntry

public NodeEntry getNodeEntry(Fqn fqn)

Returns null

Specified by:

getNodeEntry in interface EvictionQueue

Parameters:

fqn - Fqn of the node entry to retrieve.

Returns:

Node Entry object associated with given Fqn param.

getNodeEntry

public NodeEntry getNodeEntry(String fqn)

Returns null

Specified by:

getNodeEntry in interface EvictionQueue

getNumberOfElements

public int getNumberOfElements()

Returns 0

Specified by:

getNumberOfElements in interface EvictionQueue

Returns:

The number of elements in the queue.

getNumberOfNodes

public int getNumberOfNodes()

Returns 0

Specified by:

getNumberOfNodes in interface EvictionQueue

Returns:

The number of nodes in the queue.

iterator

public Iterator<NodeEntry> iterator()

Returns an Iterator whose hasNext() returns false.

Specified by:

iterator in interface Iterable<NodeEntry>

modifyElementCount

public void modifyElementCount(int difference)

No-op

Specified by:

modifyElementCount in interface EvictionQueue

removeNodeEntry

public void removeNodeEntry(NodeEntry entry)

No-op

Specified by:

removeNodeEntry in interface EvictionQueue

Parameters:

entry - The NodeEntry to remove from queue.