org.infinispan.commands.read

Class AbstractDataCommand

java.lang.Object

org.infinispan.commands.AbstractLocalFlagAffectedCommand

org.infinispan.commands.AbstractFlagAffectedCommand

org.infinispan.commands.read.AbstractDataCommand

All Implemented Interfaces:

DataCommand, FlagAffectedCommand, LocalFlagAffectedCommand, MetadataAwareCommand, ReplicableCommand, TopologyAffectedCommand, VisitableCommand

Direct Known Subclasses:

AbstractDataWriteCommand, GetKeyValueCommand

public abstract class AbstractDataCommand
extends AbstractFlagAffectedCommand
implements DataCommand

Since:

4.0

Author:

Mircea.Markus@jboss.com, Sanne Grinovero (C) 2011 Red Hat Inc.

Field Summary

Fields

Modifier and Type	Field and Description
protected Object	key

Fields inherited from class org.infinispan.commands.AbstractLocalFlagAffectedCommand

flags

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDataCommand()
protected	AbstractDataCommand(Object key, Set<Flag> flags)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	canBlock() If true, the command is processed asynchronously in a thread provided by an Infinispan thread pool.
boolean	equals(Object obj)
Object	getKey()
abstract Object[]	getParameters() Used by marshallers to stream this command across a network
int	hashCode()
boolean	ignoreCommandOnStatus(ComponentStatus status) Similar to VisitableCommand.shouldInvoke(InvocationContext) but evaluated by InvocationContextInterceptor.
boolean	isReturnValueExpected() If true, a return value will be provided when performed remotely.
void	setKey(Object key)
abstract void	setParameters(int commandId, Object[] parameters) Used by the CommandsFactory to create a command from raw data read off a stream.
boolean	shouldInvoke(InvocationContext ctx) Used by the InboundInvocationHandler to determine whether the command should be invoked or not.
String	toString()

Methods inherited from class org.infinispan.commands.AbstractFlagAffectedCommand

getMetadata, getTopologyId, setMetadata, setTopologyId

Methods inherited from class org.infinispan.commands.AbstractLocalFlagAffectedCommand

getFlags, hasFlag, setFlags, setFlags

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.infinispan.commands.VisitableCommand

acceptVisitor

Methods inherited from interface org.infinispan.commands.TopologyAffectedCommand

getTopologyId, setTopologyId

Methods inherited from interface org.infinispan.commands.ReplicableCommand

getCommandId, perform

Methods inherited from interface org.infinispan.commands.LocalFlagAffectedCommand

getFlags, hasFlag, setFlags, setFlags

Field Detail

key

protected Object key

Constructor Detail

AbstractDataCommand

protected AbstractDataCommand(Object key,
                   Set<Flag> flags)

AbstractDataCommand

protected AbstractDataCommand()

Method Detail

getKey

public Object getKey()

Specified by:

getKey in interface DataCommand

setKey

public void setKey(Object key)

setParameters

public abstract void setParameters(int commandId,
                 Object[] parameters)

Description copied from interface: ReplicableCommand

Used by the CommandsFactory to create a command from raw data read off a stream.

Specified by:

setParameters in interface ReplicableCommand

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.

parameters - object array of args

getParameters

public abstract Object[] getParameters()

Description copied from interface: ReplicableCommand

Used by marshallers to stream this command across a network

Specified by:

getParameters in interface ReplicableCommand

Returns:

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

shouldInvoke

public boolean shouldInvoke(InvocationContext ctx)

Description copied from interface: VisitableCommand

Used by the InboundInvocationHandler to determine whether the command should be invoked or not.

Specified by:

shouldInvoke in interface VisitableCommand

Returns:

true if the command should be invoked, false otherwise.

ignoreCommandOnStatus

public boolean ignoreCommandOnStatus(ComponentStatus status)

Description copied from interface: VisitableCommand

Similar to VisitableCommand.shouldInvoke(InvocationContext) but evaluated by InvocationContextInterceptor. Commands can opt to be discarded in case the cache status is not suited (as InvalidateCommand)

Specified by:

ignoreCommandOnStatus in interface VisitableCommand

Returns:

true if the command should NOT be invoked.

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

isReturnValueExpected

public boolean isReturnValueExpected()

Description copied from interface: ReplicableCommand

If true, a return value will be provided when performed remotely. Otherwise, a remote ResponseGenerator may choose to simply return null to save on marshalling costs.

Specified by:

isReturnValueExpected in interface ReplicableCommand

Returns:

true or false

canBlock

public boolean canBlock()

Description copied from interface: ReplicableCommand

If true, the command is processed asynchronously in a thread provided by an Infinispan thread pool. Otherwise, the command is processed directly in the JGroups thread.

This feature allows to avoid keep a JGroups thread busy that can originate discard of messages and retransmissions. So, the commands that can block (waiting for some state, acquiring locks, etc.) should return true.

Specified by:

canBlock in interface ReplicableCommand

Returns:

true if the command can block/wait, false otherwise