/// <summary>
/// Checkpoint is a safe point to clear cache pages without loose pages references.
/// Is called after each document insert/update/deleted/indexed/fetch from query
/// </summary>
public void CheckPoint()
{
// works only when journal are enabled
if (_disk.IsJournalEnabled && _pager.CachePageCount >= _cacheSize)
{
_log.Write(Logger.CACHE, "cache checkpoint reached at {0} pages in cache", _pager.CachePageCount);
// write all dirty pages in data file (journal
foreach (var page in _pager.GetDirtyPages())
{
// first write in journal file original data
_disk.WriteJournal(page.PageID, page.DiskData);
// then writes no datafile new changed pages
_disk.WritePage(page.PageID, page.WritePage());
}
// empty all cache pages
_pager.ClearCache();
}
}
