code: protected String startMonitoring() {
          String result;
          if ( ! this.started.getAndSet(true) ) {
              synchronized ( this.brokerPollerMap ) {
                  for (ActiveMQBrokerPoller onePoller : this.brokerPollerMap.values()) {
                      onePoller.start();
                  }
              }
  
              result = "started";
          } else {
              result = "already running";
          }
          return result;
      }
docs: Start monitoring now.
  
  @return text describing the result.