How to use

positionAsKey

method

in

io.zeebe.logstreams.log.LogStreamRecordWriter

 @Override
 public long writeEvent(LogStreamRecordWriter writer) {
  if (shouldCommitPositions()) {
   final ExporterRecord record = state.newExporterRecord();
   rawMetadata
     .reset()
     .recordType(RecordType.EVENT)
     .valueType(ValueType.EXPORTER)
     .intent(ExporterIntent.EXPORTED);
   return writer.positionAsKey().valueWriter(record).metadataWriter(rawMetadata).tryWrite();
  }
  return 0;
 }
}

 @Override
 public long writeEvent(LogStreamRecordWriter writer) {
  if (shouldCommitPositions()) {
   final ExporterRecord record = state.newExporterRecord();
   rawMetadata
     .reset()
     .recordType(RecordType.EVENT)
     .valueType(ValueType.EXPORTER)
     .intent(ExporterIntent.EXPORTED);
   return writer.positionAsKey().valueWriter(record).metadataWriter(rawMetadata).tryWrite();
  }
  return 0;
 }
}

 private boolean writeCommand(
   int partitionId, ValueType valueType, Intent intent, UnpackedObject command) {

  final Partition partition = leaderPartitions.get(partitionId);
  if (partition == null) {
   // ignore message if you are not the leader of the partition
   return true;
  }

  logStreamWriter.wrap(partition.getLogStream());

  recordMetadata.reset().recordType(RecordType.COMMAND).valueType(valueType).intent(intent);

  final long position =
    logStreamWriter
      .positionAsKey()
      .metadataWriter(recordMetadata)
      .valueWriter(command)
      .tryWrite();

  return position > 0;
 }
}

 private boolean writeCommand(
   int partitionId, ValueType valueType, Intent intent, UnpackedObject command) {

  final Partition partition = leaderPartitions.get(partitionId);
  if (partition == null) {
   // ignore message if you are not the leader of the partition
   return true;
  }

  logStreamWriter.wrap(partition.getLogStream());

  recordMetadata.reset().recordType(RecordType.COMMAND).valueType(valueType).intent(intent);

  final long position =
    logStreamWriter
      .positionAsKey()
      .metadataWriter(recordMetadata)
      .valueWriter(command)
      .tryWrite();

  return position > 0;
 }
}

 public long write() {
  final LogStreamRecordWriter writer = new LogStreamWriterImpl(logStream);
  if (key >= 0) {
   writer.key(key);
  } else {
   writer.positionAsKey();
  }
  writer.metadataWriter(metadata);
  writer.valueWriter(value);
  return doRepeatedly(() -> writer.tryWrite()).until(p -> p >= 0);
 }
}

 public long write() {
  final LogStreamRecordWriter writer = new LogStreamWriterImpl(logStream);
  if (key >= 0) {
   writer.key(key);
  } else {
   writer.positionAsKey();
  }
  writer.metadataWriter(metadata);
  writer.valueWriter(value);
  return doRepeatedly(() -> writer.tryWrite()).until(p -> p >= 0);
 }
}

 public long tryWrite(final Raft raft) {
  logStreamWriter.wrap(raft.getLogStream());

  metadata.reset().valueType(ValueType.RAFT).recordType(RecordType.EVENT).intent(intent);

  configuration.reset();

  final ValueArray<RaftConfigurationEventMember> configurationMembers = configuration.members();

  // add self also to configuration
  configurationMembers.add().setNodeId(raft.getNodeId());

  final List<RaftMember> memberList = raft.getRaftMembers().getMemberList();
  for (final RaftMember member : memberList) {
   configurationMembers.add().setNodeId(member.getNodeId());
  }

  return logStreamWriter
    .positionAsKey()
    .metadataWriter(metadata)
    .valueWriter(configuration)
    .tryWrite();
 }
}

 public long tryWrite(final Raft raft) {
  logStreamWriter.wrap(raft.getLogStream());

  metadata.reset().valueType(ValueType.RAFT).recordType(RecordType.EVENT).intent(intent);

  configuration.reset();

  final ValueArray<RaftConfigurationEventMember> configurationMembers = configuration.members();

  // add self also to configuration
  configurationMembers.add().setNodeId(raft.getNodeId());

  final List<RaftMember> memberList = raft.getRaftMembers().getMemberList();
  for (final RaftMember member : memberList) {
   configurationMembers.add().setNodeId(member.getNodeId());
  }

  return logStreamWriter
    .positionAsKey()
    .metadataWriter(metadata)
    .valueWriter(configuration)
    .tryWrite();
 }
}