Exemple #1
0
  @Override
  public DiskData build() throws IOException {
    meta.assign(parser);
    meta.dirty = true;

    // calculate optimized output buffer sizes to reduce disk fragmentation
    final Runtime rt = Runtime.getRuntime();
    final long max = Math.min(1 << 22, rt.maxMemory() - rt.freeMemory() >> 2);
    int bs = (int) Math.min(meta.filesize, max);
    bs = Math.max(IO.BLOCKSIZE, bs - bs % IO.BLOCKSIZE);

    // drop old database (if available) and create new one
    DropDB.drop(dbname, sopts);
    sopts.dbpath(dbname).md();

    elemNames = new Names(meta);
    attrNames = new Names(meta);
    try {
      tout = new DataOutput(new TableOutput(meta, DATATBL));
      xout = new DataOutput(meta.dbfile(DATATXT), bs);
      vout = new DataOutput(meta.dbfile(DATAATV), bs);
      sout = new DataOutput(meta.dbfile(DATATMP), bs);

      final Performance perf = Prop.debug ? new Performance() : null;
      Util.debug(tit() + DOTS);
      parse();
      if (Prop.debug) Util.errln(" " + perf + " (" + Performance.getMemory() + ')');

    } catch (final IOException ex) {
      try {
        close();
      } catch (final IOException ignored) {
      }
      throw ex;
    }
    close();

    // copy temporary values into database table
    try (final DataInput in = new DataInput(meta.dbfile(DATATMP))) {
      final TableAccess ta = new TableDiskAccess(meta, true);
      for (; spos < ssize; ++spos) ta.write4(in.readNum(), 8, in.readNum());
      ta.close();
    }
    meta.dbfile(DATATMP).delete();

    // return database instance
    return new DiskData(meta, elemNames, attrNames, path, ns);
  }