org.jboss.cache.commands.write
Class InvalidateCommand

java.lang.Object
  org.jboss.cache.commands.read.AbstractDataCommand
      org.jboss.cache.commands.write.AbstractVersionedDataCommand
          org.jboss.cache.commands.write.EvictCommand
              org.jboss.cache.commands.write.InvalidateCommand

All Implemented Interfaces:

Cloneable, DataCommand, ReplicableCommand, ReversibleCommand, VersionedDataCommand, VisitableCommand

public class InvalidateCommand
extends EvictCommand

Very much like an evict(), except that regardless of whether there is a child present, this call will never remove the node from memory - just remove its contents.

Also, potentially throws a cache exception if data versioning is used and the node in memory has a newer data version than what is passed in.

Finally, the data version of the in-memory node is updated to the version being evicted to prevent versions going out of sync.

Since:

2.2

Author:

Mircea.Markus@jboss.com

Field Summary

static int

METHOD_ID

Fields inherited from class org.jboss.cache.commands.write.EvictCommand

VERSIONED_METHOD_ID

Fields inherited from class org.jboss.cache.commands.write.AbstractVersionedDataCommand

dataVersion, globalTransaction, notifier

Fields inherited from class org.jboss.cache.commands.read.AbstractDataCommand

dataContainer, fqn

Constructor Summary

InvalidateCommand()

InvalidateCommand(Fqn fqn)

Method Summary

Object	acceptVisitor(InvocationContext ctx, Visitor visitor) Accept a visitor, and return the result of accepting this visitor.
int	getCommandId() Used by marshallers to convert this command into an id for streaming.
Object[]	getParameters() Basic versions of these methods
void	initialize(TransactionManager txManager, CacheSPI cacheSpi, boolean optimistic)
boolean	isVersioned() Has data version set? (i.e.
protected boolean	isVersionedId(int id)
Object	perform(InvocationContext ctx) Performs an invalidation on a specified node
void	setParameters(int commandId, Object[] args) Basic versions of these methods
String	toString()

Methods inherited from class org.jboss.cache.commands.write.EvictCommand

isRecursive, rollback, setRecursive

Methods inherited from class org.jboss.cache.commands.write.AbstractVersionedDataCommand

equals, getDataVersion, getGlobalTransaction, hashCode, initialize, setDataVersion, setGlobalTransaction

Methods inherited from class org.jboss.cache.commands.read.AbstractDataCommand

getFqn, initialize

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jboss.cache.commands.DataCommand

getFqn

Field Detail

METHOD_ID

public static final int METHOD_ID

See Also:

Constant Field Values

Constructor Detail

InvalidateCommand

public InvalidateCommand(Fqn fqn)

InvalidateCommand

public InvalidateCommand()

Method Detail

initialize

public void initialize(TransactionManager txManager,
                       CacheSPI cacheSpi,
                       boolean optimistic)

perform

public Object perform(InvocationContext ctx)

Performs an invalidation on a specified node

Specified by:

perform in interface ReplicableCommand

Overrides:

perform in class EvictCommand

Parameters:

ctx - invocation context

Returns:

null

acceptVisitor

public Object acceptVisitor(InvocationContext ctx,
                            Visitor visitor)
                     throws Throwable

Description copied from interface: VisitableCommand

Accept a visitor, and return the result of accepting this visitor.

Specified by:

acceptVisitor in interface VisitableCommand

Overrides:

acceptVisitor in class EvictCommand

Parameters:

ctx - invocation context

visitor - visitor to accept

Returns:

arbitrary return value

Throws:

Throwable - in the event of problems

isVersioned

public boolean isVersioned()

Description copied from interface: VersionedDataCommand

Has data version set? (i.e. not null)

Specified by:

isVersioned in interface VersionedDataCommand

Overrides:

isVersioned in class AbstractVersionedDataCommand

Returns:

true if getDataVersion() would not return null; false otherwise.

isVersionedId

protected boolean isVersionedId(int id)

Overrides:

isVersionedId in class EvictCommand

getCommandId

public int getCommandId()

Description copied from interface: ReplicableCommand

Used by marshallers to convert this command into an id for streaming.

Specified by:

getCommandId in interface ReplicableCommand

Overrides:

getCommandId in class EvictCommand

Returns:

the method id of this command. This is compatible with pre-2.2.0 MethodCall ids.

toString

public String toString()

Overrides:

toString in class EvictCommand

getParameters

public Object[] getParameters()

Description copied from class: AbstractDataCommand

Basic versions of these methods

Specified by:

getParameters in interface ReplicableCommand

Overrides:

getParameters in class EvictCommand

Returns:

an object array of arguments, compatible with pre-2.2.0 MethodCall args.

setParameters

public void setParameters(int commandId,
                          Object[] args)

Description copied from class: AbstractDataCommand

Basic versions of these methods

Specified by:

setParameters in interface ReplicableCommand

Overrides:

setParameters in class EvictCommand

Parameters:

commandId - command id to set. This is usually unused but *could* be used in the event of a command having multiple IDs, such as PutKeyValueCommand.

args - object array of args