author | prr |
Sat, 19 Sep 2015 15:45:59 -0700 | |
changeset 32865 | f9cb6e427f9e |
parent 25859 | 3317bb8137f4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.awt.image; |
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import java.awt.*; |
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import java.lang.ref.*; |
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import java.util.*; |
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import java.util.concurrent.locks.*; |
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import sun.awt.AppContext; |
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/** |
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* ImageCache - A fixed pixel count sized cache of Images keyed by arbitrary |
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* set of arguments. All images are held with SoftReferences so they will be |
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* dropped by the GC if heap memory gets tight. When our size hits max pixel |
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* count least recently requested images are removed first. |
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* |
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* The ImageCache must be used from the thread with an AppContext only. |
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* |
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*/ |
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public final class ImageCache { |
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// Ordered Map keyed by args hash, ordered by most recent accessed entry. |
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private final LinkedHashMap<PixelsKey, ImageSoftReference> map |
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= new LinkedHashMap<>(16, 0.75f, true); |
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// Maximum number of pixels to cache, this is used if maxCount |
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private final int maxPixelCount; |
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// The current number of pixels stored in the cache |
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private int currentPixelCount = 0; |
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// Lock for concurrent access to map |
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private final ReadWriteLock lock = new ReentrantReadWriteLock(); |
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// Reference queue for tracking lost softreferences to images in the cache |
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private final ReferenceQueue<Image> referenceQueue = new ReferenceQueue<>(); |
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public static ImageCache getInstance() { |
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return AppContext.getSoftReferenceValue(ImageCache.class, |
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() -> new ImageCache()); |
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} |
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ImageCache(final int maxPixelCount) { |
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this.maxPixelCount = maxPixelCount; |
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} |
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ImageCache() { |
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this((8 * 1024 * 1024) / 4); // 8Mb of pixels |
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} |
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public void flush() { |
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lock.writeLock().lock(); |
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try { |
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map.clear(); |
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} finally { |
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lock.writeLock().unlock(); |
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} |
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} |
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public Image getImage(final PixelsKey key){ |
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final ImageSoftReference ref; |
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lock.readLock().lock(); |
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try { |
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ref = map.get(key); |
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} finally { |
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lock.readLock().unlock(); |
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} |
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return ref == null ? null : ref.get(); |
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} |
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/** |
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* Sets the cached image for the specified constraints. |
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* |
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* @param key The key with which the specified image is to be associated |
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* @param image The image to store in cache |
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*/ |
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public void setImage(final PixelsKey key, final Image image) { |
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lock.writeLock().lock(); |
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try { |
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ImageSoftReference ref = map.get(key); |
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// check if currently in map |
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if (ref != null) { |
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if (ref.get() != null) { |
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return; |
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} |
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// soft image has been removed |
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currentPixelCount -= key.getPixelCount(); |
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map.remove(key); |
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}; |
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// add new image to pixel count |
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final int newPixelCount = key.getPixelCount(); |
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currentPixelCount += newPixelCount; |
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// clean out lost references if not enough space |
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if (currentPixelCount > maxPixelCount) { |
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while ((ref = (ImageSoftReference)referenceQueue.poll()) != null) { |
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//reference lost |
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map.remove(ref.key); |
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currentPixelCount -= ref.key.getPixelCount(); |
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} |
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} |
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// remove old items till there is enough free space |
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if (currentPixelCount > maxPixelCount) { |
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final Iterator<Map.Entry<PixelsKey, ImageSoftReference>> |
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mapIter = map.entrySet().iterator(); |
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while ((currentPixelCount > maxPixelCount) && mapIter.hasNext()) { |
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final Map.Entry<PixelsKey, ImageSoftReference> entry = |
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mapIter.next(); |
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mapIter.remove(); |
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final Image img = entry.getValue().get(); |
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if (img != null) img.flush(); |
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currentPixelCount -= entry.getValue().key.getPixelCount(); |
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} |
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} |
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|
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// finally put new in map |
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map.put(key, new ImageSoftReference(key, image, referenceQueue)); |
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} finally { |
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lock.writeLock().unlock(); |
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} |
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} |
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|
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public interface PixelsKey { |
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int getPixelCount(); |
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} |
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|
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private static class ImageSoftReference extends SoftReference<Image> { |
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|
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final PixelsKey key; |
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ImageSoftReference(final PixelsKey key, final Image referent, |
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final ReferenceQueue<? super Image> q) { |
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super(referent, q); |
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this.key = key; |
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} |
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} |
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} |