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();
}
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;
}
}