Package org.opendaylight.controller.cluster.raft.behaviors

Class Follower

java.lang.Object

org.opendaylight.controller.cluster.raft.behaviors.AbstractRaftActorBehavior

org.opendaylight.controller.cluster.raft.behaviors.Follower

All Implemented Interfaces:

AutoCloseable, RaftActorBehavior

public class Follower
extends AbstractRaftActorBehavior

The behavior of a RaftActor in the Follower raft state.

• Respond to RPCs from candidates and leaders
• If election timeout elapses without receiving AppendEntries RPC from current leader or granting vote to candidate: convert to candidate

Field Summary

Fields inherited from class org.opendaylight.controller.cluster.raft.behaviors.AbstractRaftActorBehavior

context, log

Constructor Summary

Constructors

Constructor	Description
Follower(RaftActorContext context)
Follower(RaftActorContext context, String initialLeaderId, short initialLeaderPayloadVersion)

Method Summary

Modifier and Type	Method	Description
void	close()
String	getLeaderId()	Returns the id of the leader.
short	getLeaderPayloadVersion()	Returns the leader's payload data version.
protected RaftActorBehavior	handleAppendEntries(ActorRef sender, AppendEntries appendEntries)	Derived classes should not directly handle AppendEntries messages it should let the base class handle it first.
protected RaftActorBehavior	handleAppendEntriesReply(ActorRef sender, AppendEntriesReply appendEntriesReply)	Derived classes should not directly handle AppendEntriesReply messages it should let the base class handle it first.
RaftActorBehavior	handleMessage(ActorRef sender, Object message)	Handle a message.
protected RaftActorBehavior	handleRequestVoteReply(ActorRef sender, RequestVoteReply requestVoteReply)	Derived classes should not directly handle RequestVoteReply messages it should let the base class handle it first.
protected void	setLeaderId(@Nullable String leaderId)
protected void	setLeaderPayloadVersion(short leaderPayloadVersion)

Methods inherited from class org.opendaylight.controller.cluster.raft.behaviors.AbstractRaftActorBehavior

actor, appendEntries, applyLogToStateMachine, canGrantVote, canStartElection, createBehavior, currentTerm, electionDuration, getId, getLogEntryIndex, getLogEntryOrSnapshotTerm, getLogEntryTerm, getMajorityVoteCount, getReplicatedToAllIndex, internalSwitchBehavior, internalSwitchBehavior, lastIndex, lastTerm, logName, performSnapshotWithoutCapture, requestVote, scheduleElection, setReplicatedToAllIndex, shouldUpdateTerm, state, stopElection, switchBehavior, votedFor

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Follower

public Follower(RaftActorContext context)

Follower

public Follower(RaftActorContext context,
                String initialLeaderId,
                short initialLeaderPayloadVersion)

Method Detail

getLeaderId

public final String getLeaderId()

Description copied from interface: RaftActorBehavior

Returns the id of the leader.

Returns:

the id of the leader or null if not known

setLeaderId

protected final void setLeaderId(@Nullable String leaderId)

getLeaderPayloadVersion

public short getLeaderPayloadVersion()

Description copied from interface: RaftActorBehavior

Returns the leader's payload data version.

Returns:

a short representing the version

setLeaderPayloadVersion

protected final void setLeaderPayloadVersion(short leaderPayloadVersion)

handleAppendEntries

protected RaftActorBehavior handleAppendEntries(ActorRef sender,
                                                AppendEntries appendEntries)

Description copied from class: AbstractRaftActorBehavior

Derived classes should not directly handle AppendEntries messages it should let the base class handle it first. Once the base class handles the AppendEntries message and does the common actions that are applicable in all RaftState's it will delegate the handling of the AppendEntries message to the derived class to do more state specific handling by calling this method

Specified by:

handleAppendEntries in class AbstractRaftActorBehavior

Parameters:

sender - The actor that sent this message

appendEntries - The AppendEntries message

Returns:

a new behavior if it was changed or the current behavior

handleAppendEntriesReply

protected RaftActorBehavior handleAppendEntriesReply(ActorRef sender,
                                                     AppendEntriesReply appendEntriesReply)

Description copied from class: AbstractRaftActorBehavior

Derived classes should not directly handle AppendEntriesReply messages it should let the base class handle it first. Once the base class handles the AppendEntriesReply message and does the common actions that are applicable in all RaftState's it will delegate the handling of the AppendEntriesReply message to the derived class to do more state specific handling by calling this method

Specified by:

handleAppendEntriesReply in class AbstractRaftActorBehavior

Parameters:

sender - The actor that sent this message

appendEntriesReply - The AppendEntriesReply message

Returns:

a new behavior if it was changed or the current behavior

handleRequestVoteReply

protected RaftActorBehavior handleRequestVoteReply(ActorRef sender,
                                                   RequestVoteReply requestVoteReply)

Description copied from class: AbstractRaftActorBehavior

Derived classes should not directly handle RequestVoteReply messages it should let the base class handle it first. Once the base class handles the RequestVoteReply message and does the common actions that are applicable in all RaftState's it will delegate the handling of the RequestVoteReply message to the derived class to do more state specific handling by calling this method

Specified by:

handleRequestVoteReply in class AbstractRaftActorBehavior

Parameters:

sender - The actor that sent this message

requestVoteReply - The RequestVoteReply message

Returns:

a new behavior if it was changed or the current behavior

handleMessage

public RaftActorBehavior handleMessage(ActorRef sender,
                                       Object message)

Description copied from interface: RaftActorBehavior

Handle a message. If the processing of the message warrants a state change then a new behavior should be returned otherwise this method should return the current behavior.

Specified by:

handleMessage in interface RaftActorBehavior

Overrides:

handleMessage in class AbstractRaftActorBehavior

Parameters:

sender - The sender of the message

message - A message that needs to be processed

Returns:

The new behavior or current behavior, or null if the message was not handled.

close

public void close()