@Override
protected synchronized void removeRegistration() {
if (listenerRegistrationActor != null) {
listenerRegistrationActor.tell(
CloseDataTreeChangeListenerRegistration.getInstance(), ActorRef.noSender());
listenerRegistrationActor = null;
}
dataChangeListenerActor.tell(PoisonPill.getInstance(), ActorRef.noSender());
}
private void setListenerRegistrationActor(final ActorSelection actor) {
if (actor == null) {
LOG.debug("Ignoring null actor on {}", this);
return;
}
synchronized (this) {
if (!isClosed()) {
this.listenerRegistrationActor = actor;
return;
}
}
// This registration has already been closed, notify the actor
actor.tell(CloseDataTreeChangeListenerRegistration.getInstance(), null);
}
private void sendAppendEntriesToFollower(
ActorSelection followerActor,
long followerNextIndex,
List<ReplicatedLogEntry> entries,
String followerId) {
AppendEntries appendEntries =
new AppendEntries(
currentTerm(),
context.getId(),
prevLogIndex(followerNextIndex),
prevLogTerm(followerNextIndex),
entries,
context.getCommitIndex(),
super.getReplicatedToAllIndex(),
context.getPayloadVersion());
if (!entries.isEmpty() || LOG.isTraceEnabled()) {
LOG.debug(
"{}: Sending AppendEntries to follower {}: {}", logName(), followerId, appendEntries);
}
followerActor.tell(appendEntries.toSerializable(), actor());
}
/**
* Sends a snapshot chunk to a given follower InstallSnapshot should qualify as a heartbeat too.
*/
private void sendSnapshotChunk(ActorSelection followerActor, String followerId) {
try {
if (snapshot.isPresent()) {
ByteString nextSnapshotChunk =
getNextSnapshotChunk(followerId, snapshot.get().getSnapshotBytes());
// Note: the previous call to getNextSnapshotChunk has the side-effect of adding
// followerId to the followerToSnapshot map.
FollowerToSnapshot followerToSnapshot = mapFollowerToSnapshot.get(followerId);
followerActor.tell(
new InstallSnapshot(
currentTerm(),
context.getId(),
snapshot.get().getLastIncludedIndex(),
snapshot.get().getLastIncludedTerm(),
nextSnapshotChunk,
followerToSnapshot.incrementChunkIndex(),
followerToSnapshot.getTotalChunks(),
Optional.of(followerToSnapshot.getLastChunkHashCode()))
.toSerializable(),
actor());
if (LOG.isDebugEnabled()) {
LOG.debug(
"{}: InstallSnapshot sent to follower {}, Chunk: {}/{}",
logName(),
followerActor.path(),
followerToSnapshot.getChunkIndex(),
followerToSnapshot.getTotalChunks());
}
}
} catch (IOException e) {
LOG.error("{}: InstallSnapshot failed for Leader.", logName(), e);
}
}
{
ActorSelection selection = getContext().actorSelection("/user/another");
selection.tell(new Identify(identifyId), getSelf());
}