Class RecyclingTileFactory

  • All Implemented Interfaces:
    Observer, TileFactory, TileRecycler

    public class RecyclingTileFactory
    extends Observable
    implements TileFactory, TileRecycler, Observer
    A simple implementation of TileFactory wherein the tiles returned from createTile() attempt to re-use primitive arrays provided by the TileRecycler method recycleTile().

    A simple example of the use of this class is as follows wherein image files are read, each image is filtered, and each output written to a file:

     String[] sourceFiles; // source file paths
     KernelJAI kernel; // filtering kernel
     // Create a RenderingHints object and set hints.
     RenderingHints rh = new RenderingHints(null);
     RecyclingTileFactory rtf = new RecyclingTileFactory();
     rh.put(JAI.KEY_TILE_RECYCLER, rtf);
     rh.put(JAI.KEY_TILE_FACTORY, rtf);
     rh.put(JAI.KEY_IMAGE_LAYOUT, new ImageLayout().setTileWidth(32).setTileHeight(
     int counter = 0;
     // Read each image, filter it, and save the output to a file.
     for (int i = 0; i < sourceFiles.length; i++) {
            PlanarImage source = JAI.create("fileload", sourceFiles[i]);
            ParameterBlock pb = (new ParameterBlock()).addSource(source).add(kernel);
            // The TileFactory hint will cause tiles to be created by 'rtf'.
            RenderedOp dest = JAI.create("convolve", pb, rh);
            String fileName = "image_" + (++counter) + ".tif";
            JAI.create("filestore", dest, fileName);
            // The TileRecycler hint will cause arrays to be reused by 'rtf'.
    In the above code, if the SampleModel of all source images is identical, then data arrays should only be created in the first iteration.
    JAI 1.1.2
    • Constructor Summary

      Constructor Description
      RecyclingTileFactory​(Observable tileCache)
      Constructs a RecyclingTileFactory.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean canReclaimMemory()
      Returns true.
      WritableRaster createTile​(SampleModel sampleModel, Point location)  
      void flush()  
      long getMemoryUsed()  
      boolean isMemoryCache()
      Returns true.
      void recycleTile​(Raster tile)
      Recycle the given tile.
      void update​(Observable o, Object arg)  
      • Methods inherited from class Observable

        addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged
      • Methods inherited from class Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • RecyclingTileFactory

        public RecyclingTileFactory​(Observable tileCache)
        Constructs a RecyclingTileFactory.
    • Method Detail

      • canReclaimMemory

        public boolean canReclaimMemory()
        Returns true.
        Specified by:
        canReclaimMemory in interface TileFactory
      • isMemoryCache

        public boolean isMemoryCache()
        Returns true.
        Specified by:
        isMemoryCache in interface TileFactory
      • getMemoryUsed

        public long getMemoryUsed()
        Specified by:
        getMemoryUsed in interface TileFactory
      • flush

        public void flush()
        Specified by:
        flush in interface TileFactory
      • createTile

        public WritableRaster createTile​(SampleModel sampleModel,
                                         Point location)
        Specified by:
        createTile in interface TileFactory
      • recycleTile

        public void recycleTile​(Raster tile)
        Recycle the given tile.
        Specified by:
        recycleTile in interface TileRecycler
      • update

        public void update​(Observable o,
                           Object arg)
        Specified by:
        update in interface Observer