Examples of com.sun.media.jai.util.SunTileCache

com.sun.media.jai.util.SunTileCache
This is Sun Microsystems' reference implementation of the javax.media.jai.TileCache interface. It provides a central location for images to cache computed tiles, and is used as the default tile cache mechanism when no other tile cache objects are specified.
In this implementation, the cache size is limited by the memory capacity, which may be set at construction time or using the setMemoryCapacity(long) method. The tile capacity is not used. Different images may have very different tile sizes. Therefore, the memory usage for a specific tile capacity may vary greatly depends on the type of images involved. In fact, the tile capacity is rather meaningless. @see javax.media.jai.TileCache

        
        add(new Link("free.memory.jai") {
            private static final long serialVersionUID = 1L;


            public void onClick() {
                SunTileCache jaiCache = getGeoServer().getGlobal().getJAI().getTileCache();
                final long capacityBefore = jaiCache.getMemoryCapacity();
                jaiCache.flush();
                jaiCache.setMemoryCapacity(0); // to be sure we realease all tiles
                System.gc();
                System.runFinalization();
                jaiCache.setMemoryCapacity(capacityBefore);
                updateModel();
            }
        });


        add(new AjaxLink("clear.resourceCache") {

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        values.put(KEY_JAI_IMAGEIO_AVAILABLE, Boolean.toString(PackageUtil.isCodecLibAvailable()));


        GeoServerInfo geoServerInfo = getGeoServer().getGlobal();
        JAIInfo jaiInfo = geoServerInfo.getJAI();
        JAI jai =  jaiInfo.getJAI();
        SunTileCache jaiCache = jaiInfo.getTileCache();


        values.put(KEY_JAI_MAX_MEM, formatMemory(jaiCache.getMemoryCapacity()));
        values.put(KEY_JAI_MEM_USAGE, formatMemory(jaiCache.getCacheMemoryUsed()));
        values.put(KEY_JAI_MEM_THRESHOLD, Float.toString(100.0f * jaiCache.getMemoryThreshold()));
        values.put(KEY_JAI_TILE_THREADS, Integer.toString(jai.getTileScheduler().getParallelism()));
        values.put(KEY_JAI_TILE_THREAD_PRIORITY, Integer.toString(jai.getTileScheduler()
                .getPriority()));


        values.put(KEY_UPDATE_SEQUENCE, Long.toString(geoServerInfo.getUpdateSequence()));

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            jaiDef.setRenderingHint(JAI.KEY_TILE_FACTORY, recyclingFactory);
            jaiDef.setRenderingHint(JAI.KEY_TILE_RECYCLER, recyclingFactory);
        }
        
        // Setting up Cache Capacity
        SunTileCache jaiCache = (SunTileCache) jaiDef.getTileCache();
        jai.setTileCache( jaiCache );
        
        long jaiMemory = (long) (jai.getMemoryCapacity() * Runtime.getRuntime().maxMemory());
        jaiCache.setMemoryCapacity(jaiMemory);
        
        // Setting up Cache Threshold
        jaiCache.setMemoryThreshold((float) jai.getMemoryThreshold());
        
        jaiDef.getTileScheduler().setParallelism(jai.getTileThreads());
        jaiDef.getTileScheduler().setPrefetchParallelism(jai.getTileThreads());
        jaiDef.getTileScheduler().setPriority(jai.getTilePriority());
        jaiDef.getTileScheduler().setPrefetchPriority(jai.getTilePriority());

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        /**
         Initialize Java Advanced Imaging.
         */
        public static void initJAI() {
            JAI jaiInstance = JAI.getDefaultInstance();
            jaiInstance.setTileCache( new SunTileCache( 100*1024*1024 ) );
            jaiInstance.setDefaultTileSize( new Dimension( 256, 256 ) );
        /*
         Not sure how much this helps in practice - Photovault still seems to use
         all heap available in the long run.
         */

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  }
    }
    
    public String getJAICacheDebugInfo() {
        StringBuffer buf = new StringBuffer();
        SunTileCache tileCache = (SunTileCache) JAI.getDefaultInstance().getTileCache();
        buf.append( "cmiss=" + tileCache.getCacheMissCount() + ", chits=" + tileCache.getCacheHitCount() + 
                ", ctiles=" + tileCache.getCacheTileCount() + "cache used=" + tileCache.getCacheMemoryUsed() );
        return buf.toString();
    }

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    public static TileCache createTileCache(int tileCapacity,
                                            long memCapacity) {
        if (memCapacity < 0) {
            throw new IllegalArgumentException(JaiI18N.getString("JAI10"));
        }
        return new SunTileCache(memCapacity);
    }

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     */
    public static TileCache createTileCache(long memCapacity) {
        if (memCapacity < 0) {
            throw new IllegalArgumentException(JaiI18N.getString("JAI10"));
        }
        return new SunTileCache(memCapacity);
    }

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     * belonging to the default<code>JAI</code>instance.  To force an operation
     * not to perform caching, a <code>TileCache</code> instance with
     * a tile capacity of 0 may be used.
     */
    public static TileCache createTileCache() {
        return new SunTileCache();
    }

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/*      */   public static TileCache createTileCache(int tileCapacity, long memCapacity)
/*      */   {
/*  871 */     if (memCapacity < 0L) {
/*  872 */       throw new IllegalArgumentException(JaiI18N.getString("JAI10"));
/*      */     }
/*  874 */     return new SunTileCache(memCapacity);
/*      */   }

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/*      */   public static TileCache createTileCache(long memCapacity)
/*      */   {
/*  894 */     if (memCapacity < 0L) {
/*  895 */       throw new IllegalArgumentException(JaiI18N.getString("JAI10"));
/*      */     }
/*  897 */     return new SunTileCache(memCapacity);
/*      */   }

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