import org.opendaylight.controller.cluster.raft.internal.messages.ElectionTimeout;
import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
-import org.opendaylight.controller.cluster.raft.messages.RaftRPC;
import org.opendaylight.controller.cluster.raft.messages.RequestVote;
import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
import scala.concurrent.duration.FiniteDuration;
*
* @param sender The actor that sent this message
* @param appendEntries The AppendEntries message
- * @param suggestedState The state that the RaftActor should be in based
- * on the base class's processing of the AppendEntries
- * message
* @return
*/
protected abstract RaftState handleAppendEntries(ActorRef sender,
- AppendEntries appendEntries, RaftState suggestedState);
+ AppendEntries appendEntries);
+ /**
+ * appendEntries first processes the AppendEntries message and then
+ * delegates handling to a specific behavior
+ *
+ * @param sender
+ * @param appendEntries
+ * @return
+ */
protected RaftState appendEntries(ActorRef sender,
- AppendEntries appendEntries, RaftState raftState) {
-
- if (raftState != state()) {
- context.getLogger().debug("Suggested state is " + raftState
- + " current behavior state is " + state());
- }
+ AppendEntries appendEntries) {
// 1. Reply false if term < currentTerm (§5.1)
if (appendEntries.getTerm() < currentTerm()) {
}
- return handleAppendEntries(sender, appendEntries, raftState);
+ return handleAppendEntries(sender, appendEntries);
}
/**
*
* @param sender The actor that sent this message
* @param appendEntriesReply The AppendEntriesReply message
- * @param suggestedState The state that the RaftActor should be in based
- * on the base class's processing of the
- * AppendEntriesReply message
* @return
*/
-
protected abstract RaftState handleAppendEntriesReply(ActorRef sender,
- AppendEntriesReply appendEntriesReply, RaftState suggestedState);
+ AppendEntriesReply appendEntriesReply);
+ /**
+ * requestVote handles the RequestVote message. This logic is common
+ * for all behaviors
+ *
+ * @param sender
+ * @param requestVote
+ * @return
+ */
protected RaftState requestVote(ActorRef sender,
- RequestVote requestVote, RaftState suggestedState) {
+ RequestVote requestVote) {
boolean grantVote = false;
if (candidateLatest) {
grantVote = true;
- context.getTermInformation().update(requestVote.getTerm(),
+ context.getTermInformation().updateAndPersist(requestVote.getTerm(),
requestVote.getCandidateId());
}
}
sender.tell(new RequestVoteReply(currentTerm(), grantVote), actor());
- return suggestedState;
+ return state();
}
/**
*
* @param sender The actor that sent this message
* @param requestVoteReply The RequestVoteReply message
- * @param suggestedState The state that the RaftActor should be in based
- * on the base class's processing of the RequestVote
- * message
* @return
*/
-
protected abstract RaftState handleRequestVoteReply(ActorRef sender,
- RequestVoteReply requestVoteReply, RaftState suggestedState);
+ RequestVoteReply requestVoteReply);
+ /**
+ * Creates a random election duration
+ *
+ * @return
+ */
protected FiniteDuration electionDuration() {
long variance = new Random().nextInt(ELECTION_TIME_MAX_VARIANCE);
return new FiniteDuration(ELECTION_TIME_INTERVAL + variance,
TimeUnit.MILLISECONDS);
}
+ /**
+ * stop the scheduled election
+ */
protected void stopElection() {
if (electionCancel != null && !electionCancel.isCancelled()) {
electionCancel.cancel();
}
}
+ /**
+ * schedule a new election
+ *
+ * @param interval
+ */
protected void scheduleElection(FiniteDuration interval) {
-
stopElection();
// Schedule an election. When the scheduler triggers an ElectionTimeout
context.getActorSystem().dispatcher(), context.getActor());
}
+ /**
+ * Get the current term
+ * @return
+ */
protected long currentTerm() {
return context.getTermInformation().getCurrentTerm();
}
+ /**
+ * Get the candidate for whom we voted in the current term
+ * @return
+ */
protected String votedFor() {
return context.getTermInformation().getVotedFor();
}
+ /**
+ * Get the actor associated with this behavior
+ * @return
+ */
protected ActorRef actor() {
return context.getActor();
}
+ /**
+ * Get the term from the last entry in the log
+ *
+ * @return
+ */
protected long lastTerm() {
return context.getReplicatedLog().lastTerm();
}
+ /**
+ * Get the index from the last entry in the log
+ *
+ * @return
+ */
protected long lastIndex() {
return context.getReplicatedLog().lastIndex();
}
+ /**
+ * Find the client request tracker for a specific logIndex
+ *
+ * @param logIndex
+ * @return
+ */
protected ClientRequestTracker findClientRequestTracker(long logIndex) {
return null;
}
+ /**
+ * Find the log index from the previous to last entry in the log
+ *
+ * @return
+ */
+ protected long prevLogIndex(long index){
+ ReplicatedLogEntry prevEntry =
+ context.getReplicatedLog().get(index - 1);
+ if (prevEntry != null) {
+ return prevEntry.getIndex();
+ }
+ return -1;
+ }
+
+ /**
+ * Find the log term from the previous to last entry in the log
+ * @return
+ */
+ protected long prevLogTerm(long index){
+ ReplicatedLogEntry prevEntry =
+ context.getReplicatedLog().get(index - 1);
+ if (prevEntry != null) {
+ return prevEntry.getTerm();
+ }
+ return -1;
+ }
+
+ /**
+ * Apply the provided index to the state machine
+ *
+ * @param index a log index that is known to be committed
+ */
protected void applyLogToStateMachine(long index) {
// Now maybe we apply to the state machine
for (long i = context.getLastApplied() + 1;
@Override
public RaftState handleMessage(ActorRef sender, Object message) {
- RaftState raftState = state();
- if (message instanceof RaftRPC) {
- raftState = applyTerm((RaftRPC) message);
- }
if (message instanceof AppendEntries) {
- raftState = appendEntries(sender, (AppendEntries) message,
- raftState);
+ return appendEntries(sender, (AppendEntries) message);
} else if (message instanceof AppendEntriesReply) {
- raftState =
- handleAppendEntriesReply(sender, (AppendEntriesReply) message,
- raftState);
+ return handleAppendEntriesReply(sender, (AppendEntriesReply) message);
} else if (message instanceof RequestVote) {
- raftState =
- requestVote(sender, (RequestVote) message, raftState);
+ return requestVote(sender, (RequestVote) message);
} else if (message instanceof RequestVoteReply) {
- raftState =
- handleRequestVoteReply(sender, (RequestVoteReply) message,
- raftState);
+ return handleRequestVoteReply(sender, (RequestVoteReply) message);
}
- return raftState;
+ return state();
}
@Override public String getLeaderId() {
return leaderId;
}
-
- private RaftState applyTerm(RaftRPC rpc) {
- // If RPC request or response contains term T > currentTerm:
- // set currentTerm = T, convert to follower (§5.1)
- // This applies to all RPC messages and responses
- if (rpc.getTerm() > context.getTermInformation().getCurrentTerm()) {
- context.getTermInformation().update(rpc.getTerm(), null);
- return RaftState.Follower;
- }
- return state();
- }
-
}
Code Review / controller.git / blobdiff