io.atomix.protocols.raft.storage.log.entry

Class OperationEntry

java.lang.Object

io.atomix.protocols.raft.storage.log.entry.RaftLogEntry

io.atomix.protocols.raft.storage.log.entry.TimestampedEntry

io.atomix.protocols.raft.storage.log.entry.SessionEntry

io.atomix.protocols.raft.storage.log.entry.OperationEntry

Direct Known Subclasses:

CommandEntry, QueryEntry

public abstract class OperationEntry
extends SessionEntry

Stores a state machine operation.

Each state machine operation is stored with a client-provided sequence number. The sequence number is used by state machines to apply client operations in the order in which they were submitted by the client (FIFO order). Additionally, each operation is written with the leader's timestamp at the time the entry was logged. This gives state machines an approximation of time with which to react to the application of operations to the state machine.

Constructor Summary

Constructors

Constructor and Description
OperationEntry(long term, long timestamp, long session, long sequence, RaftOperation operation)

Method Summary

Modifier and Type	Method and Description
RaftOperation	operation() Returns the entry operation.
long	sequenceNumber() Returns the operation sequence number.
String	toString()

Methods inherited from class io.atomix.protocols.raft.storage.log.entry.SessionEntry

session

Methods inherited from class io.atomix.protocols.raft.storage.log.entry.TimestampedEntry

timestamp

Methods inherited from class io.atomix.protocols.raft.storage.log.entry.RaftLogEntry

term

Methods inherited from class java.lang.Object

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

Constructor Detail

OperationEntry

public OperationEntry(long term,
                      long timestamp,
                      long session,
                      long sequence,
                      RaftOperation operation)

Method Detail

operation

public RaftOperation operation()

Returns the entry operation.

Returns:

The entry operation.

sequenceNumber

public long sequenceNumber()

Returns the operation sequence number.

Returns:

The operation sequence number.

toString

public String toString()

Overrides:

toString in class SessionEntry