bundles/org.simantics.document.ui/src/org/simantics/document/ui/graphfile/ExternalEditorAdapter.java

   1 package org.simantics.document.ui.graphfile;
   2
   3 import static java.nio.file.StandardWatchEventKinds.ENTRY_DELETE;
   4 import static java.nio.file.StandardWatchEventKinds.ENTRY_MODIFY;
   5 import static java.nio.file.StandardWatchEventKinds.OVERFLOW;
   6
   7 import java.io.IOException;
   8 import java.io.UnsupportedEncodingException;
   9 import java.nio.file.FileSystems;
  10 import java.nio.file.Files;
  11 import java.nio.file.Path;
  12 import java.nio.file.WatchEvent;
  13 import java.nio.file.WatchEvent.Kind;
  14 import java.nio.file.WatchKey;
  15 import java.nio.file.WatchService;
  16 import java.security.MessageDigest;
  17 import java.security.NoSuchAlgorithmException;
  18 import java.util.Map;
  19 import java.util.Map.Entry;
  20 import java.util.concurrent.ConcurrentHashMap;
  21 import java.util.concurrent.ExecutorService;
  22 import java.util.concurrent.Executors;
  23 import java.util.concurrent.atomic.AtomicBoolean;
  24
  25 import org.eclipse.ui.PartInitException;
  26 import org.simantics.Simantics;
  27 import org.simantics.db.ReadGraph;
  28 import org.simantics.db.Resource;
  29 import org.simantics.db.common.request.UniqueRead;
  30 import org.simantics.db.exception.DatabaseException;
  31 import org.simantics.document.DocumentResource;
  32 import org.simantics.document.ui.Activator;
  33 import org.simantics.editors.Editors;
  34 import org.simantics.graphfile.util.GraphFileUtil;
  35 import org.simantics.layer0.Layer0;
  36 import org.simantics.ui.workbench.editor.AbstractResourceEditorAdapter;
  37 import org.simantics.ui.workbench.editor.EditorAdapter;
  38 import org.simantics.utils.ui.ExceptionUtils;
  39 import org.slf4j.Logger;
  40 import org.slf4j.LoggerFactory;
  41
  42 public class ExternalEditorAdapter extends AbstractResourceEditorAdapter implements EditorAdapter {
  43
  44     private static final Logger LOGGER = LoggerFactory.getLogger(ExternalEditorAdapter.class);
  45
  46     private static final Map<Path, Resource> tempFiles = new ConcurrentHashMap<>();
  47     private static ExternalFileWatcher fileWatcher;
  48
  49         public ExternalEditorAdapter() {
  50                 super(Messages.ExternalEditorAdapter_ExternalEditor, Activator.imageDescriptorFromPlugin("com.famfamfam.silk", "icons/page.png")); //$NON-NLS-2$ //$NON-NLS-3$
  51         }
  52
  53         @Override
  54         public boolean canHandle(ReadGraph g, Resource r) throws DatabaseException {
  55                 DocumentResource doc = DocumentResource.getInstance(g);
  56                 if (!g.isInstanceOf(r, doc.FileDocument))
  57                         return false;
  58                 return true;
  59         }
  60
  61     @Override
  62     protected void openEditor(final Resource input) throws Exception {
  63         // ensure watching
  64         watch();
  65
  66         Path path = null;
  67         for (Entry<Path, Resource> entry : tempFiles.entrySet()) {
  68             Resource value = entry.getValue();
  69             if (input.equals(value)) {
  70                 path = entry.getKey();
  71             }
  72         }
  73         if (path == null) {
  74             path = Simantics.getSession().syncRequest(new UniqueRead<Path>() {
  75
  76                 @Override
  77                 public Path perform(ReadGraph graph) throws DatabaseException {
  78                     StringBuilder sb = new StringBuilder();
  79                     String uri = graph.getPossibleURI(input);
  80                     if (uri != null) {
  81                         sb.append(generateSHA1(uri)).append("_"); //$NON-NLS-1$
  82                     }
  83                     sb.append(graph.getRelatedValue(input, Layer0.getInstance(graph).HasName).toString());
  84                     Path filePath = Activator.getInstanceLocation().resolve(sb.toString());
  85                     tempFiles.computeIfAbsent(filePath, t -> {
  86                         try {
  87                             GraphFileUtil.writeDataToFile(graph, input, filePath.toFile());
  88                         } catch (IOException | DatabaseException e) {
  89                             LOGGER.error("Could not write data to file ", e); //$NON-NLS-1$
  90                         }
  91                         return input;
  92                     });
  93                     LOGGER.info("Adding tempFile {} with resource {}", filePath, input); //$NON-NLS-1$
  94                     return filePath;
  95                 }
  96             });
  97         }
  98         try {
  99             Editors.openExternalEditor(path.toFile());
 100         } catch (PartInitException e) {
 101             ExceptionUtils.logAndShowError(e);
 102         }
 103     }
 104
 105     public static String generateSHA1(String message) {
 106         return hashString(message, "SHA-1"); //$NON-NLS-1$
 107     }
 108
 109     private static String hashString(String message, String algorithm) {
 110         try {
 111             MessageDigest digest = MessageDigest.getInstance(algorithm);
 112             byte[] hashedBytes = digest.digest(message.getBytes("UTF-8")); //$NON-NLS-1$
 113
 114             return convertByteArrayToHexString(hashedBytes);
 115         } catch (NoSuchAlgorithmException | UnsupportedEncodingException ex) {
 116             // Should not happen
 117             LOGGER.error("Could not generate hash", ex); //$NON-NLS-1$
 118         }
 119         return ""; //$NON-NLS-1$
 120     }
 121
 122     private static String convertByteArrayToHexString(byte[] arrayBytes) {
 123         StringBuffer stringBuffer = new StringBuffer();
 124         for (int i = 0; i < arrayBytes.length; i++) {
 125             stringBuffer.append(Integer.toString((arrayBytes[i] & 0xff) + 0x100, 16)
 126                     .substring(1));
 127         }
 128         return stringBuffer.toString();
 129     }
 130
 131     private static void watch() throws IOException {
 132         if (fileWatcher == null) {
 133             synchronized (ExternalEditorAdapter.class) {
 134                 if (fileWatcher == null) {
 135                     fileWatcher = new ExternalFileWatcher();
 136                 }
 137             }
 138         }
 139     }
 140
 141     static class ExternalFileWatcher{
 142
 143         private ExecutorService service = Executors.newFixedThreadPool(1, r -> {
 144             Thread t = new Thread(r);
 145             t.setDaemon(true);
 146             return t;
 147         });
 148
 149         private final WatchService ws;
 150         private final AtomicBoolean stopped = new AtomicBoolean(true);
 151         private ConcurrentHashMap<WatchKey, Path> keys = new ConcurrentHashMap<>();
 152
 153         public ExternalFileWatcher() throws IOException {
 154             ws = FileSystems.getDefault().newWatchService();
 155
 156             register(Activator.getInstanceLocation());
 157
 158             service.submit(() -> {
 159                 stopped.set(false);
 160
 161                 while (!stopped.get()) {
 162                     try {
 163                         WatchKey key = ws.take();
 164                         for (WatchEvent<?> watchEvent : key.pollEvents()) {
 165                             if (OVERFLOW == watchEvent.kind())
 166                                 continue; // loop
 167
 168                             @SuppressWarnings("unchecked")
 169                             WatchEvent<Path> pathEvent = (WatchEvent<Path>) watchEvent;
 170                             Kind<Path> kind = pathEvent.kind();
 171                             Path parent = keys.get(key);
 172                             Path newPath = parent.resolve(pathEvent.context());
 173                             if (ENTRY_MODIFY == kind) {
 174                                 LOGGER.info("New path modified: " + newPath); //$NON-NLS-1$
 175                                 Resource resource = tempFiles.get(newPath);
 176                                 if (resource != null) {
 177                                     GraphFileUtil.writeDataToGraph(newPath.toFile(), resource);
 178                                 } else {
 179                                     LOGGER.warn("No resource found for {}", newPath.toAbsolutePath()); //$NON-NLS-1$
 180                                 }
 181                             } else if (ENTRY_DELETE == kind) {
 182                                 System.out.println("New path deleted: " + newPath); //$NON-NLS-1$
 183                             }
 184                         }
 185                         if (!key.reset()) {
 186                             keys.remove(key);
 187 //                            break; // loop
 188                         }
 189                     } catch (InterruptedException e) {
 190                         if (!stopped.get())
 191                             LOGGER.error("Could not stop", e); //$NON-NLS-1$
 192                     } catch (Throwable t) {
 193                         LOGGER.error("An error occured", t); //$NON-NLS-1$
 194                     }
 195                 }
 196             });
 197         }
 198
 199         public void stop() {
 200             stopped.set(true);
 201         }
 202
 203         private void register(Path path) throws IOException {
 204             if (Files.isDirectory(path)) {
 205                 LOGGER.info("Registering path {}", path); //$NON-NLS-1$
 206                 WatchKey key = path.toAbsolutePath().register(ws, ENTRY_DELETE, ENTRY_MODIFY);
 207                 keys.put(key, path);
 208             }
 209         }
 210     }
 211
 212     public static void stopFileWatcher() {
 213         tempFiles.clear();
 214         if (fileWatcher != null) {
 215             fileWatcher.stop();
 216             fileWatcher = null;
 217         }
 218     }
 219 }