public unsafe StorageEnvironment(StorageEnvironmentOptions options)
{
try
{
TemporaryPage = new TemporaryPage();
_options = options;
_dataPager = options.DataPager;
_freeSpaceHandling = new FreeSpaceHandling(this);
_sliceComparer = NativeMethods.memcmp;
_headerAccessor = new HeaderAccessor(this);
var isNew = _headerAccessor.Initialize();
_scratchBufferPool = new ScratchBufferPool(this);
_journal = new WriteAheadJournal(this);
if (isNew)
CreateNewDatabase();
else // existing db, let us load it
LoadExistingDatabase();
State.FreeSpaceRoot.Name = Constants.FreeSpaceTreeName;
State.Root.Name = Constants.RootTreeName;
Writer = new TransactionMergingWriter(this, _cancellationTokenSource.Token);
if (_options.ManualFlushing == false)
_flushingTask = FlushWritesToDataFileAsync();
}
catch (Exception)
{
Dispose();
throw;
}
}
public ReturnTemporaryPageToPool(StorageEnvironment env, TemporaryPage tmp)
{
_tmp = tmp;
_env = env;
}
internal IDisposable GetTemporaryPage(Transaction tx, out TemporaryPage tmp)
{
if (tx.Flags != TransactionFlags.ReadWrite)
throw new ArgumentException("Temporary pages are only available for write transactions");
if (_tempPagesPool.Count > 0)
{
tmp = _tempPagesPool.Dequeue();
return tmp.ReturnTemporaryPageToPool;
}
tmp = new TemporaryPage();
try
{
return tmp.ReturnTemporaryPageToPool = new ReturnTemporaryPageToPool(this, tmp);
}
catch (Exception)
{
tmp.Dispose();
throw;
}
}