@Override
  public List<PydevCompletionVariant> getCompletions(String threadId, String frameId, String prefix) {
    final GetCompletionsCommand command = new GetCompletionsCommand(this, threadId, frameId, prefix);
    execute(command);
    return command.getCompletions();
  }
@Override
  public List<PydevCompletionVariant> getCompletions(String threadId, String frameId, String prefix)