import akka.actor.ActorRef;
import akka.actor.ActorSelection;
+import java.util.Set;
import org.opendaylight.controller.cluster.raft.RaftActorContext;
import org.opendaylight.controller.cluster.raft.RaftState;
import org.opendaylight.controller.cluster.raft.base.messages.ElectionTimeout;
import org.opendaylight.controller.cluster.raft.messages.RequestVote;
import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
-import java.util.Set;
-
/**
* The behavior of a RaftActor when it is in the CandidateState
* <p/>
peers = context.getPeerAddresses().keySet();
- context.getLogger().debug("Election:Candidate has following peers:"+ peers);
-
- if(peers.size() > 0) {
- // Votes are required from a majority of the peers including self.
- // The votesRequired field therefore stores a calculated value
- // of the number of votes required for this candidate to win an
- // election based on it's known peers.
- // If a peer was added during normal operation and raft replicas
- // came to know about them then the new peer would also need to be
- // taken into consideration when calculating this value.
- // Here are some examples for what the votesRequired would be for n
- // peers
- // 0 peers = 1 votesRequired (0 + 1) / 2 + 1 = 1
- // 2 peers = 2 votesRequired (2 + 1) / 2 + 1 = 2
- // 4 peers = 3 votesRequired (4 + 1) / 2 + 1 = 3
- int noOfPeers = peers.size();
- int self = 1;
- votesRequired = (noOfPeers + self) / 2 + 1;
- } else {
- votesRequired = 0;
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("{}: Election: Candidate has following peers: {}", context.getId(), peers);
}
+ votesRequired = getMajorityVoteCount(peers.size());
+
startNewTerm();
scheduleElection(electionDuration());
}
- @Override protected RaftState handleAppendEntries(ActorRef sender,
+ @Override protected RaftActorBehavior handleAppendEntries(ActorRef sender,
AppendEntries appendEntries) {
- context.getLogger().debug(appendEntries.toString());
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("{}: handleAppendEntries: {}", context.getId(), appendEntries);
+ }
- return state();
+ return this;
}
- @Override protected RaftState handleAppendEntriesReply(ActorRef sender,
+ @Override protected RaftActorBehavior handleAppendEntriesReply(ActorRef sender,
AppendEntriesReply appendEntriesReply) {
- return state();
+ return this;
}
- @Override protected RaftState handleRequestVoteReply(ActorRef sender,
+ @Override protected RaftActorBehavior handleRequestVoteReply(ActorRef sender,
RequestVoteReply requestVoteReply) {
if (requestVoteReply.isVoteGranted()) {
}
if (voteCount >= votesRequired) {
- return RaftState.Leader;
+ return switchBehavior(new Leader(context));
}
- return state();
+ return this;
}
@Override public RaftState state() {
}
@Override
- public RaftState handleMessage(ActorRef sender, Object originalMessage) {
+ public RaftActorBehavior handleMessage(ActorRef sender, Object originalMessage) {
Object message = fromSerializableMessage(originalMessage);
RaftRPC rpc = (RaftRPC) message;
- context.getLogger().debug("RaftRPC message received {} my term is {}", rpc.toString(), context.getTermInformation().getCurrentTerm());
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("{}: RaftRPC message received {} my term is {}", context.getId(), rpc,
+ context.getTermInformation().getCurrentTerm());
+ }
// If RPC request or response contains term T > currentTerm:
// set currentTerm = T, convert to follower (ยง5.1)
// This applies to all RPC messages and responses
if (rpc.getTerm() > context.getTermInformation().getCurrentTerm()) {
context.getTermInformation().updateAndPersist(rpc.getTerm(), null);
- return RaftState.Follower;
+
+ return switchBehavior(new Follower(context));
}
}
// ourselves the leader. This gives enough time for a leader
// who we do not know about (as a peer)
// to send a message to the candidate
- return RaftState.Leader;
+
+ return switchBehavior(new Leader(context));
}
startNewTerm();
scheduleElection(electionDuration());
- return state();
+ return this;
}
return super.handleMessage(sender, message);
context.getTermInformation().updateAndPersist(currentTerm + 1,
context.getId());
- context.getLogger().debug("Starting new term " + (currentTerm + 1));
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("{}: Starting new term {}", context.getId(), (currentTerm + 1));
+ }
// Request for a vote
// TODO: Retry request for vote if replies do not arrive in a reasonable