import akka.event.LoggingAdapter;
import akka.japi.Procedure;
import akka.persistence.RecoveryCompleted;
+import akka.persistence.SaveSnapshotFailure;
+import akka.persistence.SaveSnapshotSuccess;
+import akka.persistence.SnapshotOffer;
+import akka.persistence.SnapshotSelectionCriteria;
import akka.persistence.UntypedPersistentActor;
+import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
+import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
+import org.opendaylight.controller.cluster.raft.base.messages.Replicate;
import org.opendaylight.controller.cluster.raft.behaviors.Candidate;
import org.opendaylight.controller.cluster.raft.behaviors.Follower;
import org.opendaylight.controller.cluster.raft.behaviors.Leader;
import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;
+import org.opendaylight.controller.cluster.raft.client.messages.AddRaftPeer;
import org.opendaylight.controller.cluster.raft.client.messages.FindLeader;
import org.opendaylight.controller.cluster.raft.client.messages.FindLeaderReply;
-import org.opendaylight.controller.cluster.raft.internal.messages.ApplyState;
-import org.opendaylight.controller.cluster.raft.internal.messages.Replicate;
+import org.opendaylight.controller.cluster.raft.client.messages.RemoveRaftPeer;
+import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
import java.io.Serializable;
-import java.util.ArrayList;
import java.util.List;
import java.util.Map;
* RaftActor encapsulates a state machine that needs to be kept synchronized
* in a cluster. It implements the RAFT algorithm as described in the paper
* <a href='https://ramcloud.stanford.edu/wiki/download/attachments/11370504/raft.pdf'>
- * In Search of an Understandable Consensus Algorithm</a>
- * <p>
+ * In Search of an Understandable Consensus Algorithm</a>
+ * <p/>
* RaftActor has 3 states and each state has a certain behavior associated
* with it. A Raft actor can behave as,
* <ul>
- * <li> A Leader </li>
- * <li> A Follower (or) </li>
- * <li> A Candidate </li>
+ * <li> A Leader </li>
+ * <li> A Follower (or) </li>
+ * <li> A Candidate </li>
* </ul>
- *
- * <p>
+ * <p/>
+ * <p/>
* A RaftActor MUST be a Leader in order to accept requests from clients to
* change the state of it's encapsulated state machine. Once a RaftActor becomes
* a Leader it is also responsible for ensuring that all followers ultimately
* have the same log and therefore the same state machine as itself.
- *
- * <p>
+ * <p/>
+ * <p/>
* The current behavior of a RaftActor determines how election for leadership
* is initiated and how peer RaftActors react to request for votes.
- *
- * <p>
+ * <p/>
+ * <p/>
* Each RaftActor also needs to know the current election term. It uses this
* information for a couple of things. One is to simply figure out who it
* voted for in the last election. Another is to figure out if the message
* it received to update it's state is stale.
- *
- * <p>
+ * <p/>
+ * <p/>
* The RaftActor uses akka-persistence to store it's replicated log.
* Furthermore through it's behaviors a Raft Actor determines
- *
+ * <p/>
* <ul>
* <li> when a log entry should be persisted </li>
* <li> when a log entry should be applied to the state machine (and) </li>
* <li> when a snapshot should be saved </li>
* </ul>
- *
- * <a href="http://doc.akka.io/api/akka/2.3.3/index.html#akka.persistence.UntypedEventsourcedProcessor">UntypeEventSourceProcessor</a>
*/
public abstract class RaftActor extends UntypedPersistentActor {
protected final LoggingAdapter LOG =
Logging.getLogger(getContext().system(), this);
+ private static final int SNAPSHOT_ENTRY_COUNT = 100000;
+
/**
- * The current state determines the current behavior of a RaftActor
+ * The current state determines the current behavior of a RaftActor
* A Raft Actor always starts off in the Follower State
*/
private RaftActorBehavior currentBehavior;
private ReplicatedLogImpl replicatedLog = new ReplicatedLogImpl();
-
- public RaftActor(String id, Map<String, String> peerAddresses){
+ public RaftActor(String id, Map<String, String> peerAddresses) {
context = new RaftActorContextImpl(this.getSelf(),
this.getContext(),
- id, new ElectionTermImpl(getSelf().path().toString()),
+ id, new ElectionTermImpl(),
-1, -1, replicatedLog, peerAddresses, LOG);
- currentBehavior = switchBehavior(RaftState.Follower);
}
@Override public void onReceiveRecover(Object message) {
- if(message instanceof ReplicatedLogEntry) {
+ if (message instanceof SnapshotOffer) {
+ LOG.debug("SnapshotOffer called..");
+ SnapshotOffer offer = (SnapshotOffer) message;
+ Snapshot snapshot = (Snapshot) offer.snapshot();
+
+ // Create a replicated log with the snapshot information
+ // The replicated log can be used later on to retrieve this snapshot
+ // when we need to install it on a peer
+ replicatedLog = new ReplicatedLogImpl(snapshot);
+
+ context.setReplicatedLog(replicatedLog);
+
+ LOG.debug("Applied snapshot to replicatedLog. " +
+ "snapshotIndex={}, snapshotTerm={}, journal-size={}",
+ replicatedLog.snapshotIndex, replicatedLog.snapshotTerm,
+ replicatedLog.size());
+
+ // Apply the snapshot to the actors state
+ applySnapshot(snapshot.getState());
+
+ } else if (message instanceof ReplicatedLogEntry) {
replicatedLog.append((ReplicatedLogEntry) message);
- } else if(message instanceof RecoveryCompleted){
- LOG.debug("Log now has messages to index : " + replicatedLog.lastIndex());
+ } else if (message instanceof DeleteEntries) {
+ replicatedLog.removeFrom(((DeleteEntries) message).getFromIndex());
+ } else if (message instanceof UpdateElectionTerm) {
+ context.getTermInformation().update(((UpdateElectionTerm) message).getCurrentTerm(), ((UpdateElectionTerm) message).getVotedFor());
+ } else if (message instanceof RecoveryCompleted) {
+ LOG.debug(
+ "RecoveryCompleted - Switching actor to Follower - " +
+ "Last index in log:{}, snapshotIndex={}, snapshotTerm={}, " +
+ "journal-size={}",
+ replicatedLog.lastIndex(), replicatedLog.snapshotIndex,
+ replicatedLog.snapshotTerm, replicatedLog.size());
+ currentBehavior = switchBehavior(RaftState.Follower);
}
}
@Override public void onReceiveCommand(Object message) {
- if(message instanceof ApplyState){
+ if (message instanceof ApplyState){
+ ApplyState applyState = (ApplyState) message;
- ApplyState applyState = (ApplyState) message;
-
- LOG.debug("Applying state for log index {}", applyState.getReplicatedLogEntry().getIndex());
+ LOG.debug("Applying state for log index {} data {}",
+ applyState.getReplicatedLogEntry().getIndex(),
+ applyState.getReplicatedLogEntry().getData());
applyState(applyState.getClientActor(), applyState.getIdentifier(),
applyState.getReplicatedLogEntry().getData());
- } else if(message instanceof FindLeader){
+
+ } else if(message instanceof ApplySnapshot ) {
+ applySnapshot(((ApplySnapshot) message).getSnapshot());
+
+ } else if (message instanceof FindLeader) {
+ getSender().tell(
+ new FindLeaderReply(
+ context.getPeerAddress(currentBehavior.getLeaderId())),
+ getSelf()
+ );
+
+ } else if (message instanceof SaveSnapshotSuccess) {
+ SaveSnapshotSuccess success = (SaveSnapshotSuccess) message;
+
+ // TODO: Not sure if we want to be this aggressive with trimming stuff
+ trimPersistentData(success.metadata().sequenceNr());
+
+ } else if (message instanceof SaveSnapshotFailure) {
+
+ // TODO: Handle failure in saving the snapshot
+
+ } else if (message instanceof FindLeader){
+
getSender().tell(new FindLeaderReply(
context.getPeerAddress(currentBehavior.getLeaderId())),
getSelf());
+
+ } else if (message instanceof AddRaftPeer){
+
+ // FIXME : Do not add raft peers like this.
+ // When adding a new Peer we have to ensure that the a majority of
+ // the peers know about the new Peer. Doing it this way may cause
+ // a situation where multiple Leaders may emerge
+ AddRaftPeer arp = (AddRaftPeer)message;
+ context.addToPeers(arp.getName(), arp.getAddress());
+
+ } else if (message instanceof RemoveRaftPeer){
+
+ RemoveRaftPeer rrp = (RemoveRaftPeer)message;
+ context.removePeer(rrp.getName());
+
} else {
+
RaftState state =
currentBehavior.handleMessage(getSender(), message);
currentBehavior = switchBehavior(state);
}
}
- private RaftActorBehavior switchBehavior(RaftState state){
- if(currentBehavior != null) {
- if (currentBehavior.state() == state) {
- return currentBehavior;
- }
- LOG.info("Switching from state " + currentBehavior.state() + " to "
- + state);
-
- try {
- currentBehavior.close();
- } catch (Exception e) {
- LOG.error(e, "Failed to close behavior : " + currentBehavior.state());
- }
+ public java.util.Set<String> getPeers() {
+ return context.getPeerAddresses().keySet();
+ }
- } else {
- LOG.info("Switching behavior to " + state);
- }
- RaftActorBehavior behavior = null;
- if(state == RaftState.Candidate){
- behavior = new Candidate(context);
- } else if(state == RaftState.Follower){
- behavior = new Follower(context);
- } else {
- behavior = new Leader(context);
- }
- return behavior;
+ protected String getReplicatedLogState() {
+ return "snapshotIndex=" + context.getReplicatedLog().getSnapshotIndex()
+ + ", snapshotTerm=" + context.getReplicatedLog().getSnapshotTerm()
+ + ", im-mem journal size=" + context.getReplicatedLog().size();
}
+
/**
* When a derived RaftActor needs to persist something it must call
* persistData.
* @param identifier
* @param data
*/
- protected void persistData(ActorRef clientActor, String identifier, Object data){
- LOG.debug("Persist data " + identifier);
+ protected void persistData(ActorRef clientActor, String identifier,
+ Payload data) {
+
ReplicatedLogEntry replicatedLogEntry = new ReplicatedLogImplEntry(
context.getReplicatedLog().lastIndex() + 1,
context.getTermInformation().getCurrentTerm(), data);
- replicatedLog.appendAndPersist(clientActor, identifier, replicatedLogEntry);
- }
+ LOG.debug("Persist data {}", replicatedLogEntry);
- protected abstract void applyState(ActorRef clientActor, String identifier, Object data);
+ replicatedLog
+ .appendAndPersist(clientActor, identifier, replicatedLogEntry);
+ }
- protected String getId(){
+ protected String getId() {
return context.getId();
}
- protected boolean isLeader(){
+ /**
+ * Derived actors can call the isLeader method to check if the current
+ * RaftActor is the Leader or not
+ *
+ * @return true it this RaftActor is a Leader false otherwise
+ */
+ protected boolean isLeader() {
return context.getId().equals(currentBehavior.getLeaderId());
}
+ /**
+ * Derived actor can call getLeader if they need a reference to the Leader.
+ * This would be useful for example in forwarding a request to an actor
+ * which is the leader
+ *
+ * @return A reference to the leader if known, null otherwise
+ */
protected ActorSelection getLeader(){
String leaderId = currentBehavior.getLeaderId();
+ if (leaderId == null) {
+ return null;
+ }
String peerAddress = context.getPeerAddress(leaderId);
- LOG.debug("getLeader leaderId = " + leaderId + " peerAddress = " + peerAddress);
+ LOG.debug("getLeader leaderId = " + leaderId + " peerAddress = "
+ + peerAddress);
return context.actorSelection(peerAddress);
}
- private class ReplicatedLogImpl implements ReplicatedLog {
- private final List<ReplicatedLogEntry> journal = new ArrayList();
- private long snapshotIndex = 0;
- private Object snapShot = null;
+ protected RaftState getRaftState() {
+ return currentBehavior.state();
+ }
+
+ /**
+ * setPeerAddress sets the address of a known peer at a later time.
+ * <p>
+ * This is to account for situations where a we know that a peer
+ * exists but we do not know an address up-front. This may also be used in
+ * situations where a known peer starts off in a different location and we
+ * need to change it's address
+ * <p>
+ * Note that if the peerId does not match the list of peers passed to
+ * this actor during construction an IllegalStateException will be thrown.
+ *
+ * @param peerId
+ * @param peerAddress
+ */
+ protected void setPeerAddress(String peerId, String peerAddress){
+ context.setPeerAddress(peerId, peerAddress);
+ }
+
- @Override public ReplicatedLogEntry get(long index) {
- if(index < 0 || index >= journal.size()){
- return null;
- }
+ /**
+ * The applyState method will be called by the RaftActor when some data
+ * needs to be applied to the actor's state
+ *
+ * @param clientActor A reference to the client who sent this message. This
+ * is the same reference that was passed to persistData
+ * by the derived actor. clientActor may be null when
+ * the RaftActor is behaving as a follower or during
+ * recovery.
+ * @param identifier The identifier of the persisted data. This is also
+ * the same identifier that was passed to persistData by
+ * the derived actor. identifier may be null when
+ * the RaftActor is behaving as a follower or during
+ * recovery
+ * @param data A piece of data that was persisted by the persistData call.
+ * This should NEVER be null.
+ */
+ protected abstract void applyState(ActorRef clientActor, String identifier,
+ Object data);
- return journal.get((int) (index - snapshotIndex));
- }
+ /**
+ * This method will be called by the RaftActor when a snapshot needs to be
+ * created. The derived actor should respond with its current state.
+ * <p/>
+ * During recovery the state that is returned by the derived actor will
+ * be passed back to it by calling the applySnapshot method
+ *
+ * @return The current state of the actor
+ */
+ protected abstract Object createSnapshot();
+
+ /**
+ * This method will be called by the RaftActor during recovery to
+ * reconstruct the state of the actor.
+ * <p/>
+ * This method may also be called at any other point during normal
+ * operations when the derived actor is out of sync with it's peers
+ * and the only way to bring it in sync is by applying a snapshot
+ *
+ * @param snapshot A snapshot of the state of the actor
+ */
+ protected abstract void applySnapshot(Object snapshot);
- @Override public ReplicatedLogEntry last() {
- if(journal.size() == 0){
- return null;
+ private RaftActorBehavior switchBehavior(RaftState state) {
+ if (currentBehavior != null) {
+ if (currentBehavior.state() == state) {
+ return currentBehavior;
}
- return get(journal.size() - 1);
- }
+ LOG.info("Switching from state " + currentBehavior.state() + " to "
+ + state);
- @Override public long lastIndex() {
- if(journal.size() == 0){
- return -1;
+ try {
+ currentBehavior.close();
+ } catch (Exception e) {
+ LOG.error(e,
+ "Failed to close behavior : " + currentBehavior.state());
}
- return last().getIndex();
+ } else {
+ LOG.info("Switching behavior to " + state);
}
+ RaftActorBehavior behavior = null;
+ if (state == RaftState.Candidate) {
+ behavior = new Candidate(context);
+ } else if (state == RaftState.Follower) {
+ behavior = new Follower(context);
+ } else {
+ behavior = new Leader(context);
+ }
+ return behavior;
+ }
- @Override public long lastTerm() {
- if(journal.size() == 0){
- return -1;
- }
+ private void trimPersistentData(long sequenceNumber) {
+ // Trim akka snapshots
+ // FIXME : Not sure how exactly the SnapshotSelectionCriteria is applied
+ // For now guessing that it is ANDed.
+ deleteSnapshots(new SnapshotSelectionCriteria(
+ sequenceNumber - SNAPSHOT_ENTRY_COUNT, 43200000));
- return last().getTerm();
- }
+ // Trim akka journal
+ deleteMessages(sequenceNumber);
+ }
- @Override public void removeFrom(long index) {
- if(index < 0 || index >= journal.size()){
- return;
- }
- for(int i= (int) (index - snapshotIndex) ; i < journal.size() ; i++){
- deleteMessage(i);
- journal.remove(i);
- }
+ private class ReplicatedLogImpl extends AbstractReplicatedLogImpl {
+
+ public ReplicatedLogImpl(Snapshot snapshot) {
+ super(snapshot.getState(),
+ snapshot.getLastAppliedIndex(), snapshot.getLastAppliedTerm(),
+ snapshot.getUnAppliedEntries());
}
- @Override public void append(final ReplicatedLogEntry replicatedLogEntry) {
- journal.add(replicatedLogEntry);
+ public ReplicatedLogImpl() {
+ super();
}
- @Override public List<ReplicatedLogEntry> getFrom(long index) {
- List<ReplicatedLogEntry> entries = new ArrayList<>(100);
- if(index < 0 || index >= journal.size()){
- return entries;
- }
- for(int i= (int) (index - snapshotIndex); i < journal.size() ; i++){
- entries.add(journal.get(i));
+ @Override public void removeFromAndPersist(long logEntryIndex) {
+ int adjustedIndex = adjustedIndex(logEntryIndex);
+
+ if (adjustedIndex < 0) {
+ return;
}
- return entries;
+
+ // FIXME: Maybe this should be done after the command is saved
+ journal.subList(adjustedIndex , journal.size()).clear();
+
+ persist(new DeleteEntries(adjustedIndex), new Procedure<DeleteEntries>(){
+
+ @Override public void apply(DeleteEntries param)
+ throws Exception {
+ //FIXME : Doing nothing for now
+ }
+ });
}
- @Override public void appendAndPersist(final ReplicatedLogEntry replicatedLogEntry){
+ @Override public void appendAndPersist(
+ final ReplicatedLogEntry replicatedLogEntry) {
appendAndPersist(null, null, replicatedLogEntry);
}
- public void appendAndPersist(final ActorRef clientActor, final String identifier, final ReplicatedLogEntry replicatedLogEntry){
- context.getLogger().debug("Append log entry and persist" + replicatedLogEntry.getIndex());
+ public void appendAndPersist(final ActorRef clientActor,
+ final String identifier,
+ final ReplicatedLogEntry replicatedLogEntry) {
+ context.getLogger().debug(
+ "Append log entry and persist {} ", replicatedLogEntry);
// FIXME : By adding the replicated log entry to the in-memory journal we are not truly ensuring durability of the logs
journal.add(replicatedLogEntry);
+
+ // When persisting events with persist it is guaranteed that the
+ // persistent actor will not receive further commands between the
+ // persist call and the execution(s) of the associated event
+ // handler. This also holds for multiple persist calls in context
+ // of a single command.
persist(replicatedLogEntry,
new Procedure<ReplicatedLogEntry>() {
public void apply(ReplicatedLogEntry evt) throws Exception {
+ // FIXME : Tentatively create a snapshot every hundred thousand entries. To be tuned.
+ if (journal.size() > SNAPSHOT_ENTRY_COUNT) {
+ LOG.info("Initiating Snapshot Capture..");
+ long lastAppliedIndex = -1;
+ long lastAppliedTerm = -1;
+
+ ReplicatedLogEntry lastAppliedEntry = get(context.getLastApplied());
+ if (lastAppliedEntry != null) {
+ lastAppliedIndex = lastAppliedEntry.getIndex();
+ lastAppliedTerm = lastAppliedEntry.getTerm();
+ }
+
+ LOG.debug("Snapshot Capture logSize: {}", journal.size());
+ LOG.debug("Snapshot Capture lastApplied:{} ", context.getLastApplied());
+ LOG.debug("Snapshot Capture lastAppliedIndex:{}", lastAppliedIndex);
+ LOG.debug("Snapshot Capture lastAppliedTerm:{}", lastAppliedTerm);
+
+ // create a snapshot object from the state provided and save it
+ // when snapshot is saved async, SaveSnapshotSuccess is raised.
+ Snapshot sn = Snapshot.create(createSnapshot(),
+ getFrom(context.getLastApplied() + 1),
+ lastIndex(), lastTerm(), lastAppliedIndex,
+ lastAppliedTerm);
+ saveSnapshot(sn);
+
+ LOG.info("Persisting of snapshot done:{}", sn.getLogMessage());
+
+ //be greedy and remove entries from in-mem journal which are in the snapshot
+ // and update snapshotIndex and snapshotTerm without waiting for the success,
+ // TODO: damage-recovery to be done on failure
+ journal.subList(0, (int) (lastAppliedIndex - snapshotIndex)).clear();
+ snapshotIndex = lastAppliedIndex;
+ snapshotTerm = lastAppliedTerm;
+
+ LOG.info("Removed in-memory snapshotted entries, " +
+ "adjusted snaphsotIndex:{}" +
+ "and term:{}", snapshotIndex, lastAppliedTerm);
+ }
// Send message for replication
- if(clientActor != null) {
+ if (clientActor != null) {
currentBehavior.handleMessage(getSelf(),
new Replicate(clientActor, identifier,
- replicatedLogEntry));
+ replicatedLogEntry)
+ );
}
}
- });
+ }
+ );
+ }
+
+ }
+
+ private static class DeleteEntries implements Serializable {
+ private final int fromIndex;
+
+
+ public DeleteEntries(int fromIndex) {
+ this.fromIndex = fromIndex;
}
- @Override public long size() {
- return journal.size() + snapshotIndex;
+ public int getFromIndex() {
+ return fromIndex;
}
}
- private static class ReplicatedLogImplEntry implements ReplicatedLogEntry,
- Serializable {
- private final long index;
- private final long term;
- private final Object payload;
+ private static class Snapshot implements Serializable {
+ private final Object state;
+ private final List<ReplicatedLogEntry> unAppliedEntries;
+ private final long lastIndex;
+ private final long lastTerm;
+ private final long lastAppliedIndex;
+ private final long lastAppliedTerm;
+
+ private Snapshot(Object state,
+ List<ReplicatedLogEntry> unAppliedEntries, long lastIndex,
+ long lastTerm, long lastAppliedIndex, long lastAppliedTerm) {
+ this.state = state;
+ this.unAppliedEntries = unAppliedEntries;
+ this.lastIndex = lastIndex;
+ this.lastTerm = lastTerm;
+ this.lastAppliedIndex = lastAppliedIndex;
+ this.lastAppliedTerm = lastAppliedTerm;
+ }
- public ReplicatedLogImplEntry(long index, long term, Object payload){
- this.index = index;
- this.term = term;
- this.payload = payload;
+ public static Snapshot create(Object state,
+ List<ReplicatedLogEntry> entries, long lastIndex, long lastTerm,
+ long lastAppliedIndex, long lastAppliedTerm) {
+ return new Snapshot(state, entries, lastIndex, lastTerm,
+ lastAppliedIndex, lastAppliedTerm);
}
- @Override public Object getData() {
- return payload;
+ public Object getState() {
+ return state;
}
- @Override public long getTerm() {
- return term;
+ public List<ReplicatedLogEntry> getUnAppliedEntries() {
+ return unAppliedEntries;
}
- @Override public long getIndex() {
- return index;
+ public long getLastTerm() {
+ return lastTerm;
+ }
+
+ public long getLastAppliedIndex() {
+ return lastAppliedIndex;
+ }
+
+ public long getLastAppliedTerm() {
+ return lastAppliedTerm;
+ }
+
+ public String getLogMessage() {
+ StringBuilder sb = new StringBuilder();
+ return sb.append("Snapshot={")
+ .append("lastTerm:" + this.getLastTerm() + ", ")
+ .append("LastAppliedIndex:" + this.getLastAppliedIndex() + ", ")
+ .append("LastAppliedTerm:" + this.getLastAppliedTerm() + ", ")
+ .append("UnAppliedEntries size:" + this.getUnAppliedEntries().size() + "}")
+ .toString();
+
}
}
+ private class ElectionTermImpl implements ElectionTerm {
+ /**
+ * Identifier of the actor whose election term information this is
+ */
+ private long currentTerm = 0;
+ private String votedFor = null;
+
+ public long getCurrentTerm() {
+ return currentTerm;
+ }
+
+ public String getVotedFor() {
+ return votedFor;
+ }
+
+ @Override public void update(long currentTerm, String votedFor) {
+ LOG.info("Set currentTerm={}, votedFor={}", currentTerm, votedFor);
+
+ this.currentTerm = currentTerm;
+ this.votedFor = votedFor;
+ }
+
+ @Override
+ public void updateAndPersist(long currentTerm, String votedFor){
+ update(currentTerm, votedFor);
+ // FIXME : Maybe first persist then update the state
+ persist(new UpdateElectionTerm(this.currentTerm, this.votedFor), new Procedure<UpdateElectionTerm>(){
+
+ @Override public void apply(UpdateElectionTerm param)
+ throws Exception {
+
+ }
+ });
+ }
+ }
+
+ private static class UpdateElectionTerm implements Serializable {
+ private final long currentTerm;
+ private final String votedFor;
+
+ public UpdateElectionTerm(long currentTerm, String votedFor) {
+ this.currentTerm = currentTerm;
+ this.votedFor = votedFor;
+ }
+
+ public long getCurrentTerm() {
+ return currentTerm;
+ }
+
+ public String getVotedFor() {
+ return votedFor;
+ }
+ }
}
Code Review / controller.git / blobdiff