code: function log(isError, message, data){
      var indentifier = 'cacheService: ';
      if(self.verbose || isError){
        if(data) {
          console.log(indentifier + message, data);
        } else {
          console.log(indentifier + message);
        }
      }
    }
docs: Logging utility function
  @param {boolean} isError
  @param {string} message
  @param {object} data