/**
  * Sets the value of the senders argument which indicates the parties that will be generating
  * content in this session; the allowable values are defined in the <tt>SendersEnum</tt>.
  *
  * @param senders a {@link SendersEnum} instance indicating the the parties that will be
  *     generating content in this session.
  */
 public void setSenders(SendersEnum senders) {
   setAttribute(SENDERS_ATTR_NAME, senders.toString());
 }
  /**
   * Returns the value of the senders argument which indicates the parties that will be generating
   * content in this session; the allowable values are defined in the <tt>SendersEnum</tt>.
   *
   * @return a {@link SendersEnum} instance indicating the the parties that will be generating
   *     content in this session.
   */
  public SendersEnum getSenders() {
    Object attributeVal = getAttribute(SENDERS_ATTR_NAME);

    return attributeVal == null ? null : SendersEnum.valueOf(attributeVal.toString());
  }