import java.io.File;
import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.channels.FileLock;
import java.nio.file.DirectoryStream;
import java.nio.file.FileVisitOption;
import java.nio.file.FileVisitResult;
import org.simantics.db.DatabaseUserAgent;
import org.simantics.db.ServiceLocator;
import org.simantics.db.common.utils.Logger;
+import org.simantics.db.exception.SDBException;
+import org.simantics.db.server.DatabaseStartException;
import org.simantics.db.server.ProCoreException;
+import org.simantics.db.server.internal.InternalException;
/**
* @author Tuukka Lehtonen
public class AcornDatabase implements Database {
private final Path folder;
+
+ private GraphClientImpl2 currentClient;
private DatabaseUserAgent userAgent;
+ private RandomAccessFile raLockFile;
+
+ private FileLock lock;
+
+ private boolean isRunning;
+
public AcornDatabase(Path folder) {
this.folder = folder;
}
@Override
public void deleteFiles() throws ProCoreException {
- // TODO: somehow check that the acorn client is not active.
deleteTree(folder);
}
@Override
public void start() throws ProCoreException {
+ Path lockFile = folder.resolve("lock");
+ try {
+ if (!Files.exists(lockFile))
+ Files.createFile(lockFile);
+
+ raLockFile = new RandomAccessFile(lockFile.toFile(), "rw");
+ lock = raLockFile.getChannel().tryLock();
+ if (lock == null) {
+ throw new ProCoreException("The database in folder " + folder.toAbsolutePath() + " is already in use!");
+ }
+
+ isRunning = true;
+
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
}
@Override
public boolean isRunning() throws ProCoreException {
- return true;
+ return isRunning;
}
@Override
public boolean tryToStop() throws ProCoreException {
+ try {
+ lock.release();
+ raLockFile.close();
+
+ Files.deleteIfExists(folder.resolve("lock"));
+
+ isRunning = false;
+
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+
return true;
-// throw new UnsupportedOperationException();
}
@Override
@Override
public boolean isConnected() throws ProCoreException {
- return true;
+ return isRunning;
}
@Override
@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);
}