Package org.infinispan.commands.tx

Class PrepareCommand

java.lang.Object

org.infinispan.commands.tx.AbstractTransactionBoundaryCommand

org.infinispan.commands.tx.PrepareCommand

All Implemented Interfaces:

CacheRpcCommand, ReplicableCommand, TopologyAffectedCommand, TransactionBoundaryCommand, VisitableCommand, RemoteLockCommand, TransactionalRemoteLockCommand

Direct Known Subclasses:

VersionedPrepareCommand

public class PrepareCommand
extends AbstractTransactionBoundaryCommand
implements TransactionalRemoteLockCommand

Command corresponding to the 1st phase of 2PC.

Since:

4.0

Author:

Manik Surtani (manik@jboss.org), Mircea.Markus@jboss.com

Nested Class Summary

Nested classes/interfaces inherited from interface org.infinispan.commands.VisitableCommand

VisitableCommand.LoadType

Field Summary

Fields

Modifier and Type	Field	Description
static final byte	COMMAND_ID
protected List<WriteCommand>	modifications
protected boolean	onePhaseCommit
protected boolean	retriedCommand

Fields inherited from class org.infinispan.commands.tx.AbstractTransactionBoundaryCommand

cacheName, globalTx

Constructor Summary

Constructors

Constructor	Description
PrepareCommand(ByteString cacheName)
PrepareCommand(ByteString cacheName, GlobalTransaction gtx, List<WriteCommand> commands, boolean onePhaseCommit)

Method Summary

Modifier and Type	Method	Description
Object	acceptVisitor(InvocationContext ctx, Visitor visitor)	Accept a visitor, and return the result of accepting this visitor.
RemoteTxInvocationContext	createContext(ComponentRegistry componentRegistry)	It creates the transaction context.
Collection<?>	getAffectedKeys()
byte	getCommandId()	Used by marshallers to convert this command into an id for streaming.
Object	getKeyLockOwner()	It returns the lock owner of the key.
Collection<?>	getKeysToLock()	It returns a Collection with the keys to be lock.
List<WriteCommand>	getModifications()
boolean	hasModifications()
boolean	hasSkipLocking()	It checks if this command should acquire locks.
boolean	hasZeroLockAcquisition()
CompletionStage<?>	invokeAsync(ComponentRegistry registry)	Invoke the command asynchronously.
boolean	isOnePhaseCommit()
boolean	isReplayEntryWrapping()	If set to true, then the keys touched by this transaction are to be wrapped again and original ones discarded.
boolean	isRetriedCommand()
boolean	isReturnValueExpected()	If true, a return value will be provided when performed remotely.
void	readFrom(ObjectInput input)	Reads this instance from the stream written by ReplicableCommand.writeTo(ObjectOutput).
void	setReplayEntryWrapping(boolean replayEntryWrapping)
void	setRetriedCommand(boolean retriedCommand)
String	toString()
void	writeTo(ObjectOutput output)	Writes this instance to the ObjectOutput.

Methods inherited from class org.infinispan.commands.tx.AbstractTransactionBoundaryCommand

equals, getCacheName, getGlobalTransaction, getOrigin, getTopologyId, hashCode, invalidRemoteTxReturnValue, loadType, markTransactionAsRemote, setOrigin, setTopologyId, visitRemoteTransaction

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.infinispan.commands.ReplicableCommand

canBlock, invoke, invokeAsync, isSuccessful, logThrowable

Methods inherited from interface org.infinispan.commands.VisitableCommand

init

Field Details

COMMAND_ID

public static final byte COMMAND_ID

See Also:

• Constant Field Values

modifications

protected List<WriteCommand> modifications

onePhaseCommit

protected boolean onePhaseCommit

retriedCommand

protected boolean retriedCommand

Constructor Details

PrepareCommand

public PrepareCommand(ByteString cacheName,
 GlobalTransaction gtx,
 List<WriteCommand> commands,
 boolean onePhaseCommit)

PrepareCommand

public PrepareCommand(ByteString cacheName)

Method Details

invokeAsync

public CompletionStage<?> invokeAsync(ComponentRegistry registry)
                               throws Throwable

Description copied from interface: CacheRpcCommand

Invoke the command asynchronously.

This method replaces ReplicableCommand.invoke() for remote execution. The default implementation and ReplicableCommand.invoke() will be removed in future versions.

Specified by:

invokeAsync in interface CacheRpcCommand

Overrides:

invokeAsync in class AbstractTransactionBoundaryCommand

Throws:

Throwable

createContext

public RemoteTxInvocationContext createContext(ComponentRegistry componentRegistry)

Description copied from interface: TransactionalRemoteLockCommand

It creates the transaction context.

Specified by:

createContext in interface TransactionalRemoteLockCommand

Returns:

the TxInvocationContext.

getKeysToLock

public Collection<?> getKeysToLock()

Description copied from interface: RemoteLockCommand

It returns a Collection with the keys to be lock.

It may return an empty collection if no keys needs to be locked independently of the return value of RemoteLockCommand.hasSkipLocking(). It may contains duplicated keys and null is not a valid return value.

Specified by:

getKeysToLock in interface RemoteLockCommand

Returns:

a Collection of keys to lock.

getKeyLockOwner

public Object getKeyLockOwner()

Description copied from interface: RemoteLockCommand

It returns the lock owner of the key.

Usually, in transaction caches it is the GlobalTransaction and in non-transactional caches the CommandInvocationId.

Specified by:

getKeyLockOwner in interface RemoteLockCommand

Returns:

the lock owner of the key.

hasZeroLockAcquisition

public boolean hasZeroLockAcquisition()

Specified by:

hasZeroLockAcquisition in interface RemoteLockCommand

Returns:

it the locks should be acquire with 0 (zero) acquisition timeout.

hasSkipLocking

public boolean hasSkipLocking()

Description copied from interface: RemoteLockCommand

It checks if this command should acquire locks.

Specified by:

hasSkipLocking in interface RemoteLockCommand

Returns:

true if locks should be acquired for the keys in RemoteLockCommand.getKeysToLock().

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

Parameters:

ctx - invocation context

visitor - visitor to accept

Returns:

arbitrary return value

Throws:

Throwable - in the event of problems

getModifications

public List<WriteCommand> getModifications()

isOnePhaseCommit

public boolean isOnePhaseCommit()

getCommandId

public byte getCommandId()

Description copied from interface: ReplicableCommand

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

Specified by:

getCommandId in interface ReplicableCommand

Returns:

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

writeTo

public void writeTo(ObjectOutput output)
             throws IOException

Description copied from interface: ReplicableCommand

Writes this instance to the ObjectOutput.

Specified by:

writeTo in interface ReplicableCommand

Overrides:

writeTo in class AbstractTransactionBoundaryCommand

Parameters:

output - the stream.

Throws:

IOException - if an error occurred during the I/O.

readFrom

public void readFrom(ObjectInput input)
              throws IOException,
ClassNotFoundException

Description copied from interface: ReplicableCommand

Reads this instance from the stream written by ReplicableCommand.writeTo(ObjectOutput).

Specified by:

readFrom in interface ReplicableCommand

Overrides:

readFrom in class AbstractTransactionBoundaryCommand

Parameters:

input - the stream to read.

Throws:

IOException - if an error occurred during the I/O.

ClassNotFoundException - if it tries to load an undefined class.

toString

public String toString()

Overrides:

toString in class AbstractTransactionBoundaryCommand

hasModifications

public boolean hasModifications()

getAffectedKeys

public Collection<?> getAffectedKeys()

isReplayEntryWrapping

public boolean isReplayEntryWrapping()

If set to true, then the keys touched by this transaction are to be wrapped again and original ones discarded.

setReplayEntryWrapping

public void setReplayEntryWrapping(boolean replayEntryWrapping)

See Also:

• isReplayEntryWrapping()

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

Overrides:

isReturnValueExpected in class AbstractTransactionBoundaryCommand

Returns:

true or false

isRetriedCommand

public boolean isRetriedCommand()

setRetriedCommand

public void setRetriedCommand(boolean retriedCommand)