check for interupts/cancelation in ImageUtils methods/tasks; set cancelation text on progress bars.

Core/src/org/sleuthkit/autopsy/corecomponents/ThumbnailViewChildren.java

@@ -32,10 +32,10 @@ import java.util.concurrent.CancellationException;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.concurrent.Future;
 import java.util.logging.Level;
 import java.util.stream.Collectors;
 import javax.swing.SortOrder;
+import javax.swing.SwingUtilities;
 import javax.swing.SwingWorker;
 import javax.swing.Timer;
 import org.apache.commons.lang3.StringUtils;
@@ -213,13 +213,11 @@ class ThumbnailViewChildren extends Children.Keys<Integer> {
 
     }
 
-    
-
     /**
      * Node that wraps around original node and adds the bitmap icon
      * representing the picture
      */
-   private class ThumbnailViewNode extends FilterNode {
+    class ThumbnailViewNode extends FilterNode {
 
         private Logger logger = Logger.getLogger(ThumbnailViewNode.class.getName());
 
@@ -282,19 +280,28 @@ class ThumbnailViewChildren extends Children.Keys<Integer> {
 
             private final Content content;
             private final ProgressHandle progressHandle;
+            private volatile boolean started = false;
+            private final String progressText;
 
             ThumbnailLoadTask(Content content) {
                 this.content = content;
-                final String progressText = Bundle.ThumbnailViewNode_progressHandle_text(content.getName());
+                progressText = Bundle.ThumbnailViewNode_progressHandle_text(content.getName());
                 progressHandle = ProgressHandle.createHandle(progressText);
             }
 
             @Override
             protected Image doInBackground() throws Exception {
+                synchronized (progressHandle) {
                     progressHandle.start();
+                    started = true;
+                }
                 return ImageUtils.getThumbnail(content, iconSize);
             }
 
+            private void cancel() {
+                SwingUtilities.invokeLater(() -> progressHandle.setDisplayName(progressText + " (Cancelling)"));
+            }
+
             @Override
             protected void done() {
                 super.done();
@@ -302,11 +309,18 @@ class ThumbnailViewChildren extends Children.Keys<Integer> {
                     thumbCache = new SoftReference<>(super.get());
                     fireIconChange();
                 } catch (CancellationException ex) {
-                    //do nothing, it was cancelled
+                    //Task was cancelled, do nothing
                 } catch (InterruptedException | ExecutionException ex) {
+                    if (ex.getCause() instanceof CancellationException) {
+                    } else {
                         logger.log(Level.SEVERE, "Error getting thumbnail icon for " + content.getName(), ex); //NON-NLS
+                    }
                 } finally {
+                    synchronized (progressHandle) {
+                        if (started) {
                             progressHandle.finish();
+                        }
+                    }
                     if (timer != null) {
                         timer.stop();
                         timer = null;
@@ -314,24 +328,30 @@ class ThumbnailViewChildren extends Children.Keys<Integer> {
                     thumbTask = null;
                 }
             }
+
         }
     }
 
     private final ExecutorService executor = Executors.newFixedThreadPool(4,
             new ThreadFactoryBuilder().setNameFormat("Thumbnail-Loader-%d").build());
 
-    private final List<Future<?>> futures = new ArrayList<>();
+    private final List<ThumbnailViewNode.ThumbnailLoadTask> tasks = new ArrayList<>();
 
     synchronized void cancelLoadingThumbnails() {
-        futures.forEach(future -> future.cancel(true));
-        futures.clear();
+        tasks.forEach(ThumbnailViewNode.ThumbnailLoadTask::cancel);
+        tasks.clear();
+        executor.shutdownNow();
     }
 
     private synchronized ThumbnailViewNode.ThumbnailLoadTask loadThumbnail(ThumbnailViewNode node, Content content) {
+        if (executor.isShutdown() == false) {
             ThumbnailViewNode.ThumbnailLoadTask task = node.new ThumbnailLoadTask(content);
-        futures.add(task);
+            tasks.add(task);
             executor.submit(task);
             return task;
+        } else {
+            return null;
+        }
     }
 
     /**

Core/src/org/sleuthkit/autopsy/coreutils/ImageUtils.java

@@ -40,6 +40,7 @@ import java.util.List;
 import static java.util.Objects.nonNull;
 import java.util.SortedSet;
 import java.util.TreeSet;
+import java.util.concurrent.CancellationException;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
@@ -164,8 +165,8 @@ public class ImageUtils {
     /**
      * Thread/Executor that saves generated thumbnails to disk in the background
      */
-    private static final Executor imageSaver
-            = Executors.newSingleThreadExecutor(new BasicThreadFactory.Builder()
+    private static final Executor imageSaver =
+            Executors.newSingleThreadExecutor(new BasicThreadFactory.Builder()
                     .namingPattern("thumbnail-saver-%d").build()); //NON-NLS
 
     public static List<String> getSupportedImageExtensions() {
@@ -241,8 +242,9 @@ public class ImageUtils {
      *
      * @param file               the AbstractFile to test
      * @param mimeTypePrefix     a MIME 'top-level type name' such as "image/",
-     * including the "/". In addition to the list of supported MIME types, any
-     * type that starts with this prefix will be regarded as supported
+     *                           including the "/". In addition to the list of
+     *                           supported MIME types, any type that starts with
+     *                           this prefix will be regarded as supported
      * @param supportedMimeTypes a collection of mimetypes that are supported
      * @param supportedExtension a collection of extensions that are supported
      *
@@ -310,8 +312,14 @@ public class ImageUtils {
                  * to rescale easily, but we lose animations.
                  */
                 try (BufferedInputStream bufferedReadContentStream = getBufferedReadContentStream(file);) {
+                    if (Thread.interrupted()) {
+                        return DEFAULT_THUMBNAIL;
+                    }
                     final BufferedImage image = ImageIO.read(bufferedReadContentStream);
                     if (image != null) {
+                        if (Thread.interrupted()) {
+                            return DEFAULT_THUMBNAIL;
+                        }
                         return ScalrWrapper.resizeHighQuality(image, iconSize, iconSize);
                     }
                 } catch (IOException iOException) {
@@ -321,6 +329,9 @@ public class ImageUtils {
             }
 
             Task<javafx.scene.image.Image> thumbnailTask = newGetThumbnailTask(file, iconSize, true);
+            if (Thread.interrupted()) {
+                return DEFAULT_THUMBNAIL;
+            }
             thumbnailTask.run();
             try {
                 return SwingFXUtils.fromFXImage(thumbnailTask.get(), null);
@@ -367,8 +378,8 @@ public class ImageUtils {
      * @param fileID the fileID to get the cached thumbnail location for
      *
      * @return A File object representing the location of the cached thumbnail.
-     * This file may not actually exist(yet). Returns null if there was any
-     * problem getting the file, such as no case was open.
+     *         This file may not actually exist(yet). Returns null if there was
+     *         any problem getting the file, such as no case was open.
      */
     private static File getCachedThumbnailLocation(long fileID) {
         return cacheFileMap.computeIfAbsent(fileID, id -> {
@@ -553,8 +564,9 @@ public class ImageUtils {
      * file.
      *
      * @param file              the file to extract the data from
-     * @param errorTemplate a message template used to log errors. Should take
-     * one parameter: the file's unique path or name.
+     * @param errorTemplate     a message template used to log errors. Should
+     *                          take one parameter: the file's unique path or
+     *                          name.
      * @param propertyExtractor an implementation of {@link PropertyExtractor}
      *                          used to retrieve the specific property.
      *
@@ -695,7 +707,9 @@ public class ImageUtils {
                     throw new IIOException(msg);
                 }
                 updateProgress(-1, 1);
-
+                if (isCancelled()) {
+                    return null;
+                }
                 //resize, or if that fails, crop it
                 try {
                     thumbnail = ScalrWrapper.resizeFast(bufferedImage, iconSize);
@@ -709,6 +723,9 @@ public class ImageUtils {
                         final int cropHeight = Math.min(iconSize, height);
                         final int cropWidth = Math.min(iconSize, width);
                         try {
+                            if (isCancelled()) {
+                                return null;
+                            }
                             thumbnail = ScalrWrapper.cropImage(bufferedImage, cropWidth, cropHeight);
                         } catch (Exception cropException) {
                             LOGGER.log(Level.WARNING, "Could not crop {0}: " + cropException.toString(), ImageUtils.getContentPathSafe(file)); //NON-NLS
@@ -720,17 +737,15 @@ public class ImageUtils {
                 }
             }
 
-            if (isCancelled()) {
-                return null;
-            }
-
             updateProgress(-1, 1);
 
             //if we got a valid thumbnail save it
             if ((cacheFile != null) && thumbnail != null && DEFAULT_THUMBNAIL != thumbnail) {
                 saveThumbnail(thumbnail);
             }
-
+            if (isCancelled()) {
+                return null;
+            }
             return SwingFXUtils.toFXImage(thumbnail, null);
         }
 
@@ -806,6 +821,9 @@ public class ImageUtils {
         }
 
         protected javafx.scene.image.Image readImage() throws IOException {
+            if (isCancelled()) {
+                return null;
+            }
             if (ImageUtils.isGIF(file)) {
                 //use JavaFX to directly read GIF to preserve potential animation
                 javafx.scene.image.Image image = new javafx.scene.image.Image(getBufferedReadContentStream(file));
@@ -865,6 +883,14 @@ public class ImageUtils {
             }
         }
 
+        @Override
+        public boolean isCancelled() {
+            if (Thread.interrupted()) {
+                this.cancel(true);
+            }
+            return super.isCancelled();
+        }
+
         @Override
         protected void succeeded() {
             super.succeeded();