code: @Override
  	public boolean isMachineRunning( TargetHandlerParameters parameters, String machineId )
  	throws TargetException {
  
  		ComputeService computeService = jcloudContext( parameters.getTargetProperties());
  		return computeService.getNodeMetadata( machineId ) != null;
  	}
docs: /*
  (non-Javadoc)
  @see net.roboconf.target.api.TargetHandler
  #isMachineRunning(net.roboconf.target.api.TargetHandlerParameters, java.lang.String)