+
+ private class InitialSyncStatusTracker {
+
+ private static final long INVALID_LOG_INDEX = -2L;
+ private long initialLeaderCommit = INVALID_LOG_INDEX;
+ private boolean initialSyncUpDone = false;
+ private String syncedLeaderId = null;
+ private final ActorRef actor;
+
+ public InitialSyncStatusTracker(ActorRef actor) {
+ this.actor = actor;
+ }
+
+ public void update(String leaderId, long leaderCommit, long commitIndex){
+
+ if(!leaderId.equals(syncedLeaderId)){
+ initialSyncUpDone = false;
+ initialLeaderCommit = INVALID_LOG_INDEX;
+ syncedLeaderId = leaderId;
+ }
+
+ if(!initialSyncUpDone){
+ if(initialLeaderCommit == INVALID_LOG_INDEX){
+ actor.tell(new FollowerInitialSyncUpStatus(false, getId()), ActorRef.noSender());
+ initialLeaderCommit = leaderCommit;
+ } else if(commitIndex >= initialLeaderCommit){
+ actor.tell(new FollowerInitialSyncUpStatus(true, getId()), ActorRef.noSender());
+ initialSyncUpDone = true;
+ }
+ }
+ }
+ }