public int deleteMailContext(String workflowId) {
    try {
      this.db = getConnection();
      this.dbCollectionMail = this.db.getCollection(this.config.getMailCollection());
      JacksonDBCollection<MailContext, String> coll;
      coll = JacksonDBCollection.wrap(this.dbCollectionMail, MailContext.class, String.class);

      if (coll.getCount(DBQuery.is("_id", workflowId)) != 0) {
        coll.removeById(workflowId);
      } else {
        return NOT_FOUND_IN_DATABASE;
      }
    } catch (UnknownHostException ex) {
      Logger.getLogger(DaoMailContext.class.getName()).log(Level.SEVERE, null, ex);
      return ERROR_DELETING_DATA;
    }
    return DATA_SUCCESSFULLY_DELETED;
  }
  /*=================================================================
  | Function storeMailContext
  | Propósito: Store the mail settings for a particular worlflow
  | Return values: ERROR / SUCCES code (int)
  ===================================================================*/
  public int storeMailContext(MailContext mailContext) {
    try {
      this.db = getConnection();
      this.dbCollectionMail = this.db.getCollection(this.config.getMailCollection());
      JacksonDBCollection<MailContext, String> coll;
      coll = JacksonDBCollection.wrap(this.dbCollectionMail, MailContext.class, String.class);

      // if exist update
      if (coll.getCount(DBQuery.is("_id", mailContext.getAsociatedWorflow())) != 0) {
        coll.updateById(mailContext.getAsociatedWorflow(), mailContext);
      } else {
        coll.insert(mailContext);
      }
    } catch (UnknownHostException ex) {
      Logger.getLogger(DaoMailContext.class.getName()).log(Level.SEVERE, null, ex);
      return ERROR_STORING_DATA;
    }
    return DATA_SUCCESSFULLY_STORED;
  }