public void ReadRecord(int Position, object Tag, OnReadHandler CB)
{
DataBlock d = new DataBlock(this, Position, new DataBlock.OnReadHandler(ReadDataBlockSink), new object[3] {
CB, "", Tag
});
PendingReadTable[d] = d;
}
internal DataBlock(FileHashDB READER_sender, int offset, OnReadHandler rCB, object Tag)
{
OnRead += rCB;
_Tag = Tag;
CB = new AsyncCallback(ReadBlockSink);
f = READER_sender;
f.SeekLock.WaitOne();
f.fstream.Seek((long)offset, SeekOrigin.Begin);
f.fstream.BeginRead(buffer, 0, 512, CB, offset);
f.SeekLock.ReleaseMutex();
}
internal DataBlock(FileHashDB READER_sender, int offset, OnReadHandler rCB, object Tag)
{
OnRead += rCB;
_Tag = Tag;
CB = new AsyncCallback(ReadBlockSink);
f = READER_sender;
f.SeekLock.WaitOne();
f.fstream.Seek((long)offset,SeekOrigin.Begin);
f.fstream.BeginRead(buffer,0,512,CB,offset);
f.SeekLock.ReleaseMutex();
}
private void ReadDataBlockSink(DataBlock sender, string key, byte[] ReadBuffer, object Tag)
{
PendingReadTable.Remove(sender);
object[] State = (object[])Tag;
OnReadHandler CB = (OnReadHandler)State[0];
string KEY = (string)State[1];
object _Tag = State[2];
if (CB != null)
{
CB(this, KEY, ReadBuffer, _Tag);
}
}
public FileHashDB(string FullFilePath, short _BlockSize, OnReadyHandler rCB)
{
Map = new Hashtable();
ObjectReadCB = new OnReadHandler(ReadObjectSink);
OnReady += rCB;
MaxBlockSize = _BlockSize;
fstream = new FileStream(FullFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
DBFileInfo = new FileInfo(FullFilePath);
DeleteBuffer = new byte[MaxBlockSize];
DeleteCB = new AsyncCallback(DeleteSink);
ClearCB = new AsyncCallback(ClearSink);
MemoryStream ms = new MemoryStream();
byte[] x = BitConverter.GetBytes((short)0);
ms.Write(x, 0, x.Length);
ms.Write(x, 0, x.Length);
ClearBlock = ms.ToArray();
ms.Close();
if (fstream.Length > 0)
{
// Already Exists
SeekLock.WaitOne();
fstream.Seek(0, SeekOrigin.Begin);
fstream.BeginRead(InitBuffer, 0, 10, new AsyncCallback(InitSink), null);
SeekLock.ReleaseMutex();
}
else
{
IndexFilePath = DBFileInfo.FullName.Substring(0, DBFileInfo.FullName.Length - DBFileInfo.Extension.Length) + ".idx";
// Initialize File Header
byte[] BlockSize = BitConverter.GetBytes((short)MaxBlockSize);
byte[] bUpdateID = BitConverter.GetBytes(UpdateID);
byte[] eVersion = BitConverter.GetBytes(EngineVersion);
SeekLock.WaitOne();
fstream.Seek(0, SeekOrigin.Begin);
InitializeCounter = 3;
fstream.BeginWrite(BlockSize, 0, 2, new AsyncCallback(InitHeaderSink), null);
fstream.BeginWrite(bUpdateID, 0, 4, new AsyncCallback(InitHeaderSink), null);
fstream.BeginWrite(eVersion, 0, 4, new AsyncCallback(InitHeaderSink), null);
SeekLock.ReleaseMutex();
if (Interlocked.Decrement(ref InitializeCounter) == 0)
{
if (OnReady != null)
{
OnReady(this, null);
}
}
}
}
public void ReadRecord(string KEY, object Tag, OnReadHandler CB)
{
object kobj = Map[KEY];
if (kobj == null)
{
if (CB != null)
{
CB(this, KEY, new byte[0], Tag);
}
return;
}
else
{
int i = (int)kobj;
DataBlock d = new DataBlock(this, i, new DataBlock.OnReadHandler(ReadDataBlockSink), new object[3] {
CB, KEY, Tag
});
PendingReadTable[d] = d;
}
}
public FileHashDB(short _BlockSize, bool KEYS)
{
if(KEYS) Map = new Hashtable();
ObjectReadCB = new OnReadHandler(ReadObjectSink);
string FullFilePath = Guid.NewGuid().ToString();
tfc = new TempFileCollection();
tfc.AddFile(FullFilePath,false);
MaxBlockSize = _BlockSize;
fstream = new FileStream(FullFilePath,FileMode.Create,FileAccess.ReadWrite,FileShare.Read);
DBFileInfo = new FileInfo(FullFilePath);
DeleteBuffer = new byte[MaxBlockSize];
DeleteCB = new AsyncCallback(DeleteSink);
ClearCB = new AsyncCallback(ClearSink);
MemoryStream ms = new MemoryStream();
byte[] x = BitConverter.GetBytes((short)0);
ms.Write(x,0,x.Length);
ms.Write(x,0,x.Length);
ClearBlock = ms.ToArray();
ms.Close();
IndexFilePath = DBFileInfo.FullName.Substring(0,DBFileInfo.FullName.Length-DBFileInfo.Extension.Length) + ".idx";
tfc.AddFile(IndexFilePath,false);
// Initialize File Header
byte[] BlockSize = BitConverter.GetBytes((short)MaxBlockSize);
byte[] bUpdateID = BitConverter.GetBytes(UpdateID);
byte[] eVersion = BitConverter.GetBytes(EngineVersion);
SeekLock.WaitOne();
fstream.Seek(0,SeekOrigin.Begin);
InitializeCounter = 3;
fstream.BeginWrite(BlockSize,0,2,new AsyncCallback(InitHeaderSink),null);
fstream.BeginWrite(bUpdateID,0,4,new AsyncCallback(InitHeaderSink),null);
fstream.BeginWrite(eVersion,0,4,new AsyncCallback(InitHeaderSink),null);
SeekLock.ReleaseMutex();
if(Interlocked.Decrement(ref InitializeCounter)==0)
{
if(OnReady!=null) OnReady(this,null);
}
}
public void ReadRecord(string KEY, object Tag, OnReadHandler CB)
{
object kobj = Map[KEY];
if(kobj==null)
{
if(CB!=null) CB(this,KEY,new byte[0],Tag);
return;
}
else
{
int i = (int)kobj;
DataBlock d = new DataBlock(this,i,new DataBlock.OnReadHandler(ReadDataBlockSink),new object[3]{CB,KEY,Tag});
PendingReadTable[d] = d;
}
}
public void ReadRecord(int Position, object Tag, OnReadHandler CB)
{
DataBlock d = new DataBlock(this,Position,new DataBlock.OnReadHandler(ReadDataBlockSink),new object[3]{CB,"",Tag});
PendingReadTable[d] = d;
}
public void RegisterReadSubscriber(OnReadHandler subscriber)
{
player.OnRead += subscriber;
}
