io.atomix.copycat

Class NoOpCommand

java.lang.Object

io.atomix.copycat.NoOpCommand

All Implemented Interfaces:

CatalystSerializable, Command<Void>, Operation<Void>, Serializable

public class NoOpCommand
extends Object
implements Command<Void>, CatalystSerializable

Special placeholder command representing a client operation that has no effect on the state machine.

No-op commands are submitted by clients to the cluster to complete missing command sequence numbers. Copycat clusters require that clients submit commands in sequential order and use a client-provided sequence number to ensure FIFO ordering of operations submitted to the cluster. In the event that a command fails to be committed to the cluster, a client can resubmit a no-op command to ensure command sequence numbers continue to progress.

Author:

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface io.atomix.copycat.Command

Command.CompactionMode

Constructor Summary

Constructors

Constructor and Description
NoOpCommand()

Method Summary

Modifier and Type	Method and Description
void	readObject(BufferInput<?> buffer, Serializer serializer)
String	toString()
void	writeObject(BufferOutput<?> buffer, Serializer serializer)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface io.atomix.copycat.Command

compaction

Constructor Detail

NoOpCommand

public NoOpCommand()

Method Detail

writeObject

public void writeObject(BufferOutput<?> buffer,
                        Serializer serializer)

Specified by:

writeObject in interface CatalystSerializable

readObject

public void readObject(BufferInput<?> buffer,
                       Serializer serializer)

Specified by:

readObject in interface CatalystSerializable

toString

public String toString()

Overrides:

toString in class Object