question: @ Override public void run ( ) throws InterruptedException , CameraAccessException , CameraCaptureSessionClosedException , ResourceAcquisitionFailedException { FrameServer . Session session = mFrameServer . tryCreateExclusiveSession ( ) ; if ( session == null ) { return ; } try { AFTriggerResult afScanResult = new AFTriggerResult ( ) ; RequestBuilder idleBuilder = createAFIdleRequest ( null ) ; session . submitRequest ( Arrays . asList ( idleBuilder . build ( ) ) , FrameServer . RequestType . REPEATING ) ; RequestBuilder cancelBuilder = createAFCancelRequest ( null ) ; session . submitRequest ( Arrays . asList ( cancelBuilder . build ( ) ) , FrameServer . RequestType . NON_REPEATING ) ; idleBuilder = createAFIdleRequest ( afScanResult ) ; session . submitRequest ( Arrays . asList ( idleBuilder . build ( ) ) , FrameServer . RequestType . REPEATING ) ; RequestBuilder triggerBuilder = createAFTriggerRequest ( afScanResult ) ; session . submitRequest ( Arrays . asList ( triggerBuilder . build ( ) ) , FrameServer . RequestType . NON_REPEATING ) ; afScanResult . get ( ) ; } finally { session . close ( ) ; } }
target:  Performs an auto-focus scan, blocking until the scan starts, runs, and completes.