import javax.annotation.Nullable;
import org.opendaylight.controller.cluster.raft.behaviors.LeaderInstallSnapshotState;
+/**
+ * Implementation of the FollowerLogInformation interface.
+ *
+ * @author Moiz Raja
+ * @author Thomas Pantelis
+ */
public class FollowerLogInformationImpl implements FollowerLogInformation {
private final Stopwatch stopwatch = Stopwatch.createUnstarted();
private LeaderInstallSnapshotState installSnapshotState;
+ /**
+ * Constructs an instance.
+ *
+ * @param peerInfo the associated PeerInfo of the follower.
+ * @param matchIndex the initial match index.
+ * @param context the RaftActorContext.
+ */
public FollowerLogInformationImpl(PeerInfo peerInfo, long matchIndex, RaftActorContext context) {
this.nextIndex = context.getCommitIndex();
this.matchIndex = matchIndex;
}
@Override
- public long decrNextIndex() {
- return nextIndex--;
+ public boolean decrNextIndex() {
+ if (nextIndex >= 0) {
+ nextIndex--;
+ return true;
+ }
+
+ return false;
}
@Override
public boolean setNextIndex(long nextIndex) {
- if(this.nextIndex != nextIndex) {
+ if (this.nextIndex != nextIndex) {
this.nextIndex = nextIndex;
return true;
}
}
@Override
- public long incrMatchIndex(){
+ public long incrMatchIndex() {
return matchIndex++;
}
@Override
public boolean setMatchIndex(long matchIndex) {
- if(this.matchIndex != matchIndex) {
+ if (this.matchIndex != matchIndex) {
this.matchIndex = matchIndex;
return true;
}
@Override
public boolean isFollowerActive() {
- if(peerInfo.getVotingState() == VotingState.VOTING_NOT_INITIALIZED) {
+ if (peerInfo.getVotingState() == VotingState.VOTING_NOT_INITIALIZED) {
return false;
}
long elapsed = stopwatch.elapsed(TimeUnit.MILLISECONDS);
- return (stopwatch.isRunning()) &&
- (elapsed <= context.getConfigParams().getElectionTimeOutInterval().toMillis());
+ return stopwatch.isRunning()
+ && elapsed <= context.getConfigParams().getElectionTimeOutInterval().toMillis();
}
@Override
@Override
public boolean okToReplicate() {
- if(peerInfo.getVotingState() == VotingState.VOTING_NOT_INITIALIZED) {
+ if (peerInfo.getVotingState() == VotingState.VOTING_NOT_INITIALIZED) {
return false;
}
// Return false if we are trying to send duplicate data before the heartbeat interval
- if(getNextIndex() == lastReplicatedIndex){
- if(lastReplicatedStopwatch.elapsed(TimeUnit.MILLISECONDS) < context.getConfigParams()
- .getHeartBeatInterval().toMillis()){
- return false;
- }
+ if (getNextIndex() == lastReplicatedIndex && lastReplicatedStopwatch.elapsed(TimeUnit.MILLISECONDS)
+ < context.getConfigParams().getHeartBeatInterval().toMillis()) {
+ return false;
}
resetLastReplicated();
return true;
}
- private void resetLastReplicated(){
+ private void resetLastReplicated() {
lastReplicatedIndex = getNextIndex();
- if(lastReplicatedStopwatch.isRunning()){
+ if (lastReplicatedStopwatch.isRunning()) {
lastReplicatedStopwatch.reset();
}
lastReplicatedStopwatch.start();
@Override
public void setLeaderInstallSnapshotState(@Nonnull LeaderInstallSnapshotState state) {
- if(this.installSnapshotState == null) {
+ if (this.installSnapshotState == null) {
this.installSnapshotState = Preconditions.checkNotNull(state);
}
}
@Override
public void clearLeaderInstallSnapshotState() {
+ Preconditions.checkState(installSnapshotState != null);
+ installSnapshotState.close();
installSnapshotState = null;
}