/// <param name="io">The delegate I/O adapter</param>
/// <param name="blockOff">The block offset address into the I/O adapter that maps to the start index (0) of this window
/// </param>
/// <param name="len">The size of this window in bytes</param>
public BlockAwareBinWindow(BlockAwareBin io, int blockOff, int len)
{
_bin = io;
_blockOff = blockOff;
_len = len;
_disabled = false;
}
/// <param name="io">The delegate I/O adapter</param>
/// <param name="blockOff">The block offset address into the I/O adapter that maps to the start index (0) of this window
/// </param>
/// <param name="len">The size of this window in bytes</param>
public BlockAwareBinWindow(BlockAwareBin io, int blockOff, int len)
{
_bin = io;
_blockOff = blockOff;
_len = len;
_disabled = false;
}
/// <exception cref="Db4objects.Db4o.Ext.OldFormatException"></exception>
/// <exception cref="Db4objects.Db4o.Ext.DatabaseReadOnlyException"></exception>
protected sealed override void OpenImpl()
{
Config4Impl configImpl = ConfigImpl;
IStorage storage = configImpl.Storage;
bool isNew = !storage.Exists(FileName());
if (isNew)
{
LogMsg(14, FileName());
CheckReadOnly();
_handlers.OldEncryptionOff();
}
bool readOnly = configImpl.IsReadOnly();
bool lockFile = Debug4.lockFile && configImpl.LockFile() && (!readOnly);
if (NeedsLockFileThread())
{
IBin fileBin = storage.Open(new BinConfiguration(FileName(), false, 0, false, configImpl
.BlockSize()));
IBin synchronizedBin = new SynchronizedBin(fileBin);
_file = new BlockAwareBin(synchronizedBin);
}
else
{
IBin bin = storage.Open(new BinConfiguration(FileName(), lockFile, 0, readOnly, configImpl
.BlockSize()));
if (configImpl.AsynchronousSync())
{
bin = new ThreadedSyncBin(bin);
}
_file = new BlockAwareBin(bin);
}
if (isNew)
{
ConfigureNewFile();
if (configImpl.ReservedStorageSpace() > 0)
{
Reserve(configImpl.ReservedStorageSpace());
}
CommitTransaction();
WriteHeader(true, false);
}
else
{
ReadThis();
}
}
private void ZeroFile(BlockAwareBin io, Slot slot)
{
if (io == null)
{
return;
}
byte[] zeroBytes = new byte[1024];
int left = slot.Length();
int offset = 0;
while (left > zeroBytes.Length)
{
io.BlockWrite(slot.Address(), offset, zeroBytes, zeroBytes.Length);
offset += zeroBytes.Length;
left -= zeroBytes.Length;
}
if (left > 0)
{
io.BlockWrite(slot.Address(), offset, zeroBytes, left);
}
}
private void CloseDatabaseFile()
{
try
{
SyncAndClose(_file);
}
finally
{
_file = null;
}
}
