Exemplo n.º 1
0
  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();
  }
Exemplo n.º 2
0
  public Set<ODirtyPage> logDirtyPagesTable() throws IOException {
    synchronized (syncObject) {
      if (writeAheadLog == null) return Collections.emptySet();

      Set<ODirtyPage> logDirtyPages = new HashSet<ODirtyPage>(writeGroups.size() * 16);
      for (Map.Entry<GroupKey, WriteGroup> writeGroupEntry : writeGroups.entrySet()) {
        final GroupKey groupKey = writeGroupEntry.getKey();
        final WriteGroup writeGroup = writeGroupEntry.getValue();
        for (int i = 0; i < 16; i++) {
          final OCachePointer cachePointer = writeGroup.pages[i];
          if (cachePointer != null) {
            final OLogSequenceNumber lastFlushedLSN = cachePointer.getLastFlushedLsn();
            final String fileName = files.get(groupKey.fileId).getName();
            final long pageIndex = (groupKey.groupIndex << 4) + i;
            final ODirtyPage logDirtyPage = new ODirtyPage(fileName, pageIndex, lastFlushedLSN);
            logDirtyPages.add(logDirtyPage);
          }
        }
      }

      writeAheadLog.logDirtyPages(logDirtyPages);
      return logDirtyPages;
    }
  }