org.jboss.cache.mvcc
Class NullMarkerNode

java.lang.Object
  org.jboss.cache.invocation.AbstractInvocationDelegate
      org.jboss.cache.invocation.NodeInvocationDelegate
          org.jboss.cache.mvcc.ReadCommittedNode
              org.jboss.cache.mvcc.RepeatableReadNode
                  org.jboss.cache.mvcc.NullMarkerNode

All Implemented Interfaces:

Node, NodeSPI

public class NullMarkerNode
extends RepeatableReadNode

A marker node to represent a null node for repeatable read, so that a read that returns a null can continue to return null.

Since:

3.0

Author:

Manik Surtani (manik AT jboss DOT org)

Nested Class Summary

Nested classes/interfaces inherited from class org.jboss.cache.mvcc.ReadCommittedNode

ReadCommittedNode.Flags

Field Summary

Fields inherited from class org.jboss.cache.mvcc.ReadCommittedNode

backup, flags, parent

Fields inherited from class org.jboss.cache.invocation.NodeInvocationDelegate

node

Fields inherited from class org.jboss.cache.invocation.AbstractInvocationDelegate

componentRegistry, configuration, invocationContextContainer, invoker, originLocal

Constructor Summary

NullMarkerNode()

Method Summary

boolean	isDeleted() Returns true if the instance has been deleted in the current transaction.
boolean	isNullNode()
boolean	isValid() Tests if a node reference is still valid.
void	markForUpdate(DataContainer d, boolean b) A no-op.

Methods inherited from class org.jboss.cache.mvcc.RepeatableReadNode

updateNode

Methods inherited from class org.jboss.cache.mvcc.ReadCommittedNode

commitUpdate, getInternalParent, isChanged, isCreated, isFlagSet, lookupParent, markAsDeleted, markAsDeleted, rollbackUpdate, setChildrenLoaded, setCreated, setDataLoaded, setFlag, unsetFlag

Methods inherited from class org.jboss.cache.invocation.NodeInvocationDelegate

addChild, addChild, addChildDirect, addChildDirect, addChildDirect, addChildDirect, assertValid, clearData, clearDataDirect, containsKeyDirect, dataSize, equals, get, getCache, getChild, getChild, getChildDirect, getChildDirect, getChildren, getChildrenDirect, getChildrenDirect, getChildrenMapDirect, getChildrenNames, getChildrenNamesDirect, getData, getDataDirect, getDelegationTarget, getDirect, getFqn, getInternalState, getKeys, getKeysDirect, getLock, getOrCreateChild, getParent, getParentDirect, getVersion, hasChild, hasChild, hasChildrenDirect, hashCode, injectDependencies, isChildrenLoaded, isDataLoaded, isLockForChildInsertRemove, isResident, print, printDetails, put, putAll, putAllDirect, putDirect, putIfAbsent, releaseObjectReferences, remove, removeChild, removeChild, removeChildDirect, removeChildDirect, removeChildrenDirect, removeDirect, replace, replace, replaceAll, setChildrenMapDirect, setFqn, setInternalState, setLockForChildInsertRemove, setResident, setValid, setVersion, toString

Methods inherited from class org.jboss.cache.invocation.AbstractInvocationDelegate

assertIsConstructed, initialize

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

NullMarkerNode

public NullMarkerNode()

Method Detail

isNullNode

public boolean isNullNode()

Specified by:

isNullNode in interface NodeSPI

Overrides:

isNullNode in class ReadCommittedNode

Returns:

always returns true

isDeleted

public boolean isDeleted()

Description copied from interface: NodeSPI

Returns true if the instance has been deleted in the current transaction.

Specified by:

isDeleted in interface NodeSPI

Overrides:

isDeleted in class ReadCommittedNode

Returns:

always returns true so that any get commands, upon getting this node, will ignore the node as though it were removed.

isValid

public boolean isValid()

Description copied from interface: Node

Tests if a node reference is still valid. A node reference may become invalid if it has been removed, invalidated or moved, either locally or remotely. If a node is invalid, it should be fetched again from the cache or a valid parent node. Operations on invalid nodes will throw a NodeNotValidException.

Specified by:

isValid in interface Node

Overrides:

isValid in class NodeInvocationDelegate

Returns:

always returns true so that any get commands, upon getting this node, will ignore the node as though it were invalid.

markForUpdate

public void markForUpdate(DataContainer d,
                          boolean b)

A no-op.

Specified by:

markForUpdate in interface NodeSPI

Overrides:

markForUpdate in class RepeatableReadNode

Parameters:

d - data container

b - if true, and the node supports write skew checking, nodes are tested for write skews.