Package de.gsi.chart.utils

Class WritableImageCache

  • All Implemented Interfaces:
    java.lang.Iterable<javafx.scene.image.WritableImage>, java.util.Collection<javafx.scene.image.WritableImage>
    public class WritableImageCache
extends de.gsi.dataset.utils.CacheCollection<javafx.scene.image.WritableImage>
    Implements WritableImage cache collection to minimise memory re-allocation.

    N.B. This is useful to re-use short-lived data storage container to minimise the amount of garbage to be collected. This is used in situation replacing e.g. 

      
      public returnValue frequentlyExecutedFunction(...) {
          final WritableImage storage = new WritableImage(width, heigth); // allocate new memory block (costly)
          // [...] do short-lived computation on storage
          // storage is implicitly finalised by garbage collector (costly)
      }
    with 
      
      // ...
      private final WritableImageCache cache = new WritableImageCache();
      // ...
      
      public returnValue frequentlyExecutedFunction(...) {
          final byte[] storage = cache.getImage(width, height); // return previously allocated image (cheap) or allocated new if necessary 
          // [...] do short-lived computation on storage
          cache.add(storage); // return object to cache
      }
    Author:
    rstein

    • Field Summary

      • Fields inherited from class de.gsi.dataset.utils.CacheCollection

        contents

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      javafx.scene.image.WritableImage getImage​(int requiredWidth, int requiredHeight)  
      static WritableImageCache getInstance()  

      • Methods inherited from class de.gsi.dataset.utils.CacheCollection

        add, cleanup, clear, contains, iterator, remove, size

      • Methods inherited from class java.util.AbstractCollection

        addAll, containsAll, isEmpty, removeAll, retainAll, toArray, toArray, toString

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

      • Methods inherited from interface java.util.Collection

        equals, hashCode, parallelStream, removeIf, spliterator, stream, toArray

      • Methods inherited from interface java.lang.Iterable

        forEach

    • Constructor Detail

      • WritableImageCache

        public WritableImageCache()

    • Method Detail

      • getImage

        public javafx.scene.image.WritableImage getImage​(int requiredWidth,
                                                 int requiredHeight)