[GitHub] incubator-apex-malhar pull request: APEXMALHAR-1985: Using startRo...

[bhupeshchawda <gi...@git.apache.org>]

Github user bhupeshchawda commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/182#discussion_r52878430
  
    --- Diff: contrib/src/main/java/com/datatorrent/contrib/cassandra/CassandraPOJOInputOperator.java ---
    @@ -359,24 +373,43 @@ public void emitTuples()
       {
         super.emitTuples();
         if (lastRowInBatch != null) {
    -      switch (primaryKeyColumnType.getName()) {
    -        case INT:
    -          startRow = lastRowInBatch.getInt(primaryKeyColumn);
    -          break;
    -        case COUNTER:
    -          startRow = lastRowInBatch.getLong(primaryKeyColumn);
    -          break;
    -        case FLOAT:
    -          startRow = lastRowInBatch.getFloat(primaryKeyColumn);
    -          break;
    -        case DOUBLE:
    -          startRow = lastRowInBatch.getDouble(primaryKeyColumn);
    -          break;
    -        default:
    -          throw new RuntimeException("unsupported data type " + primaryKeyColumnType.getName());
    -      }
    +      startRowToken = getPrimaryKeyToken(primaryKeyColumnType.getName());
         }
    +  }
     
    +  private Long getPrimaryKeyToken(DataType.Name primaryKeyDataType)
    +  {
    +    Object keyValue;
    +    switch (primaryKeyDataType) {
    +    case UUID:
    +      keyValue = lastRowInBatch.getUUID(primaryKeyColumn);
    +      break;
    +    case INT:
    +      keyValue = lastRowInBatch.getInt(primaryKeyColumn);
    +      break;
    +    case COUNTER:
    +      keyValue = lastRowInBatch.getLong(primaryKeyColumn);
    +      break;
    +    case FLOAT:
    +      keyValue = lastRowInBatch.getFloat(primaryKeyColumn);
    +      break;
    +    case DOUBLE:
    +      keyValue = lastRowInBatch.getDouble(primaryKeyColumn);
    +      break;
    +    default:
    +      throw new RuntimeException("unsupported data type " + primaryKeyColumnType.getName());
    +    }
    +    return fetchKeyTokenFromDB(keyValue);
    +  }
    +
    +  private Long fetchKeyTokenFromDB(Object keyValue)
    +  {
    +    PreparedStatement statement = store.getSession().prepare(TOKEN_QUERY);
    --- End diff --
    
    Can we move this to setup()? This will get called for each tuple, so better to have a prepared statement created just once.


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