import java.io.File;
import java.io.IOException;
-import java.io.RandomAccessFile;
+import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.file.DirectoryStream;
+import java.nio.file.FileAlreadyExistsException;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
+import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.EnumSet;
import java.util.Properties;
import org.simantics.db.Database;
import org.simantics.db.DatabaseUserAgent;
import org.simantics.db.ServiceLocator;
-import org.simantics.db.common.utils.Logger;
+import org.simantics.db.server.DatabaseStartException;
import org.simantics.db.server.ProCoreException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
/**
* @author Tuukka Lehtonen
*/
public class AcornDatabase implements Database {
+ private static final Logger LOGGER = LoggerFactory.getLogger(AcornDatabase.class);
+
+ private static final String LOCK_FILE_NAME = "lock";
+
private final Path folder;
+ private final Path lockFile;
+
+ private GraphClientImpl2 currentClient;
private DatabaseUserAgent userAgent;
- private RandomAccessFile raLockFile;
+ private FileChannel lockFileChannel;
private FileLock lock;
public AcornDatabase(Path folder) {
this.folder = folder;
+ this.lockFile = folder.resolve(LOCK_FILE_NAME);
}
@Override
try (DirectoryStream<Path> folderStream = Files.newDirectoryStream(path)) {
return !folderStream.iterator().hasNext();
} catch (IOException e) {
- Logger.defaultLogError("Failed to open folder stream. folder=" + path, e);
+ LOGGER.error("Failed to open folder stream. folder=" + path, e);
return false;
}
}
}
@Override
- public void start() throws ProCoreException {
- Path lockFile = folder.resolve("lock");
+ public synchronized void start() throws ProCoreException {
try {
- if (!Files.exists(lockFile))
- Files.createFile(lockFile);
-
- raLockFile = new RandomAccessFile(lockFile.toFile(), "rw");
- lock = raLockFile.getChannel().tryLock();
+ try {
+ lockFileChannel = lockFile.getFileSystem().provider().newFileChannel(lockFile,
+ EnumSet.of(StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE));
+ } catch (FileAlreadyExistsException e) {
+ throw new ProCoreException("The database in folder " + folder.toAbsolutePath() + " is already in use!", e);
+ }
+
+ lock = lockFileChannel.tryLock();
if (lock == null) {
+ safeLoggingClose(lockFileChannel, lockFile);
throw new ProCoreException("The database in folder " + folder.toAbsolutePath() + " is already in use!");
}
-
+
isRunning = true;
-
} catch (IOException e) {
- e.printStackTrace();
+ LOGGER.error("Failed to start database at " + folder.toAbsolutePath(), e);
+ safeLoggingClose(lockFileChannel, lockFile);
}
}
}
@Override
- public boolean tryToStop() throws ProCoreException {
+ public synchronized boolean tryToStop() throws ProCoreException {
+ if (!isRunning)
+ return false;
try {
- lock.release();
- raLockFile.close();
-
- Files.deleteIfExists(folder.resolve("lock"));
-
+ safeLoggingClose(lock, lockFile);
+ lock = null;
+ safeLoggingClose(lockFileChannel, lockFile);
+ lockFileChannel = null;
+ Files.deleteIfExists(lockFile);
isRunning = false;
-
} catch (IOException e) {
- e.printStackTrace();
+ LOGGER.error("Failed to start database at " + folder.toAbsolutePath(), e);
}
-
return true;
}
@Override
public void purgeDatabase() throws ProCoreException {
- // TODO: implement
- throw new UnsupportedOperationException();
+ if(currentClient == null) throw new IllegalStateException("No current session.");
+ currentClient.purgeDatabase();
}
@Override
public long serverGetTailChangeSetId() throws ProCoreException {
- // "We have it all"
- // But after purging we don't so beware.
- // TODO: beware for purge
- return 1;
+ if(currentClient == null) throw new IllegalStateException("No current session.");
+ return currentClient.getTailChangeSetId();
}
@Override
public Session newSession(ServiceLocator locator) throws ProCoreException {
try {
- return new GraphClientImpl2(this, folder, locator);
+ if(currentClient != null) throw new DatabaseStartException(folder.toFile(), "A session is already running. Only one session is supported.");
+ currentClient = new GraphClientImpl2(this, folder, locator);
+ return currentClient;
} catch (IOException e) {
throw new ProCoreException(e);
}
return "LZ4";
}
+ private static void safeLoggingClose(AutoCloseable closeable, Path file) {
+ if (closeable == null)
+ return;
+ try (AutoCloseable c = closeable) {
+ } catch (Exception e) {
+ LOGGER.error("Failed to close " + closeable.getClass() + " of " + file.toAbsolutePath());
+ }
+ }
+
}