1 /* 2 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8188083 27 * @summary The test checks whether applying image filters using 28 * FilteredImageSource results in a NullPointerException. 29 * @run main FilteredImageSourceTest 30 */ 31 import java.awt.Graphics; 32 import java.awt.Image; 33 import java.awt.image.ColorModel; 34 import java.awt.image.FilteredImageSource; 35 import java.awt.image.ImageConsumer; 36 import java.awt.image.ImageFilter; 37 import java.awt.image.ImageObserver; 38 import java.awt.image.ImageProducer; 39 import java.util.Hashtable; 40 41 /* 42 * An empty image consumer that will be added to the list of consumers 43 * interested in image data for the filtered image. 44 */ 45 class EmptyImageConsumer implements ImageConsumer { 46 @Override 47 public void setDimensions(int width, int height) { 48 } 49 50 @Override 51 public void setProperties(Hashtable<?, ?> props) { 52 } 53 54 @Override 55 public void setColorModel(ColorModel colorModel) { 56 } 57 58 @Override 59 public void setHints(int hintFlags) { 60 } 61 62 @Override 63 public void setPixels(int x, int y, int width, int height, 64 ColorModel colorModel, byte[] pixels, 65 int offset, int scanSize) { 66 } 67 68 @Override 69 public void setPixels(int x, int y, int width, int height, 70 ColorModel colorModel, int[] pixels, 71 int offset, int scanSize) { 72 } 73 74 @Override 75 public void imageComplete(int i) { 76 } 77 } 78 79 /* 80 * An empty image producer whose sole purpose is to provide stub methods 81 * that will be invoked while preparing filtered image. 82 */ 83 class EmptyImageProducer implements ImageProducer { 84 @Override 85 public void addConsumer(ImageConsumer imageConsumer) { 86 } 87 88 @Override 89 public boolean isConsumer(ImageConsumer imageConsumer) { 90 return false; 91 } 92 93 @Override 94 public void removeConsumer(ImageConsumer imageConsumer) { 95 } 96 97 @Override 98 public void startProduction(ImageConsumer imageConsumer) { 99 } 100 101 @Override 102 public void requestTopDownLeftRightResend(ImageConsumer imageConsumer) { 103 } 104 } 105 106 /* 107 * Typically, an Image object will contain an ImageProducer that prepares 108 * image data. FilteredImageSource will be set as image producer for images 109 * that require image filter applied to image data. 110 */ 111 class EmptyFilteredImage extends Image { 112 ImageFilter filter = null; 113 ImageProducer producer = null; 114 115 public EmptyFilteredImage(ImageProducer imgSource) { 116 filter = new ImageFilter(); 117 producer = new FilteredImageSource(imgSource, filter); 118 } 119 120 @Override 121 public int getWidth(ImageObserver observer) { 122 return 100; 123 } 124 125 @Override 126 public int getHeight(ImageObserver observer) { 127 return 100; 128 } 129 130 @Override 131 public ImageProducer getSource() { 132 return producer; 133 } 134 135 @Override 136 public Graphics getGraphics() { 137 throw new UnsupportedOperationException(); 138 } 139 140 @Override 141 public Object getProperty(String name, ImageObserver observer) { 142 return null; 143 } 144 } 145 146 public final class FilteredImageSourceTest { 147 // Minimum test duration in ms 148 private static final int TEST_MIN_DURATION = 5000; 149 150 /* 151 * A throwable object that will hold any exception generated while 152 * executing methods on FilteredImageSource. The test passes if the 153 * methods execute without any exception 154 */ 155 private static volatile Throwable fail = null; 156 157 public static void main(final String[] args) 158 throws InterruptedException { 159 final ImageConsumer ic = new EmptyImageConsumer(); 160 final ImageProducer ip = new EmptyImageProducer(); 161 final Image image = new EmptyFilteredImage(ip); 162 163 /* 164 * Simulate the framework's operations on FilteredImageSource by 165 * invoking the concerned methods in multiple threads and observe 166 * whether exceptions are generated. 167 */ 168 Thread t1 = new Thread(() -> { 169 try { 170 while (true) { 171 image.getSource().addConsumer(ic); 172 } 173 } catch (Throwable t) { 174 fail = t; 175 } 176 }); 177 t1.setDaemon(true); 178 179 Thread t2 = new Thread(() -> { 180 try { 181 while (true) { 182 image.getSource().removeConsumer(ic); 183 } 184 } catch (Throwable t) { 185 fail = t; 186 } 187 }); 188 t2.setDaemon(true); 189 190 Thread t3 = new Thread(() -> { 191 try { 192 while (true) { 193 image.getSource().startProduction(ic); 194 } 195 } catch (Throwable t) { 196 fail = t; 197 } 198 }); 199 t3.setDaemon(true); 200 201 // Start the threads 202 t1.start(); 203 t2.start(); 204 t3.start(); 205 206 // Wait on one of the threads for a specific duration. 207 t1.join(TEST_MIN_DURATION); 208 if (fail != null) { 209 throw new RuntimeException("Test failed with exception: ", fail); 210 } 211 } 212 }