コード例 #1
0
ファイル: OWOWCache.java プロジェクト: kmussel/orientdb
  private void flushPage(long fileId, long pageIndex, ODirectMemoryPointer dataPointer)
      throws IOException {
    if (writeAheadLog != null) {
      OLogSequenceNumber lsn = ODurablePage.getLogSequenceNumberFromPage(dataPointer);
      OLogSequenceNumber flushedLSN = writeAheadLog.getFlushedLSN();
      if (flushedLSN == null || flushedLSN.compareTo(lsn) < 0) writeAheadLog.flush();
    }

    final byte[] content = dataPointer.get(0, pageSize);
    OLongSerializer.INSTANCE.serializeNative(MAGIC_NUMBER, content, 0);

    final int crc32 = calculatePageCrc(content);
    OIntegerSerializer.INSTANCE.serializeNative(crc32, content, OLongSerializer.LONG_SIZE);

    final OFileClassic fileClassic = files.get(fileId);
    fileClassic.write(pageIndex * pageSize, content);

    if (syncOnPageFlush) fileClassic.synch();
  }