code: private MonitorInformation getMonitorInformation(L location) {
  		final K monitorKey = getLocationKey(location);
  		MonitorInformation monitorInformation = monitorInformations.get(monitorKey);
  		if (monitorInformation == null) {
  			// Not found, let's call delegate
  			if (delegate.isMonitored(location)) {
  				monitorInformation = new MonitorInformation(true, delegate.getMonitor(location));
  			} else {
  				monitorInformation = NULL_MONITOR_INFORMATION;
  			}
  			monitorInformations.put(monitorKey, monitorInformation);
  		}
  		return monitorInformation;
  	}
docs: Get monitor information for given location.
  First monitor information is looked up in cache.
  Then, when not found, delegate is called.
  
  @param location Location
  @return Monitor information