@Override
  public AddPartitionMessage buildAddPartitionMessage(Table table, Iterator<Partition> partitionsIterator) {
    return new JSONAddPartitionMessage(HCAT_SERVER_URL, HCAT_SERVICE_PRINCIPAL, table.getDbName(),
        table.getTableName(), table.getTableType(),
        MessageBuilder.getPartitionKeyValues(table, partitionsIterator), now());
  }
The JSON implementation of the MessageFactory. Constructs JSON implementations of
each message-type.
hcatalog/server-extensions/src/main/java/org/apache/hive/hcatalog/messaging/json/JSONMessageFactory.java