internal static void SkipHeader(AbstractBufferedReader reader)
{
reader.SkipBlock(DiskChunkCache.MagicStartOfFile.Length + 1); // magic + type of file
reader.SkipVInt64(); // generation
reader.SkipVUInt32(); // keySize
reader.SkipVUInt64(); // keyValueCount
}
public void CreateSource()
{
using (var os = new System.IO.StreamWriter("source.cs", false, Encoding.UTF8))
{
while (!_reader.Eof)
{
var operation = (KVReplayOperation)_reader.ReadUInt8();
Console.WriteLine(operation);
uint tri;
switch (operation)
{
case KVReplayOperation.Open:
var initialStreamSize = _reader.ReadVUInt64();
_dbstream = new MemoryPositionLessStream();
var buf = new byte[4096];
ulong pos = 0;
while (pos < initialStreamSize)
{
var r = (int)Math.Min((ulong)buf.Length, initialStreamSize - pos);
_reader.ReadBlock(buf, 0, r);
_dbstream.Write(buf, 0, r, pos);
pos += (ulong)r;
}
os.WriteLine("var db=new KeyValueDB();");
os.WriteLine("var dbstream = new MemoryPositionLessStream();");
os.WriteLine("db.Open(dbstream,true);");
break;
case KVReplayOperation.KeyValueDBDispose:
os.WriteLine("db.Dispose();");
break;
case KVReplayOperation.StartTransaction:
tri = _reader.ReadVUInt32();
os.WriteLine(string.Format("var tr{0}=db.StartTransaction();", tri));
break;
case KVReplayOperation.CalculateStats:
tri = _reader.ReadVUInt32();
break;
case KVReplayOperation.FindKey:
tri = _reader.ReadVUInt32();
int keyLen = _reader.ReadVInt32();
int keyOfs = _reader.ReadVInt32();
var keyBuf = new byte[keyLen];
_reader.ReadBlock(keyBuf, 0, keyLen);
var strategy = (FindKeyStrategy)_reader.ReadVUInt32();
var content = new StringBuilder();
content.Append("{");
if (keyBuf.Length != 0)
{
foreach (var b in keyBuf)
{
content.Append(b);
content.Append(",");
}
content.Length--;
}
content.Append("}");
if (strategy == FindKeyStrategy.Create)
{
os.WriteLine(string.Format("tr{0}.CreateKey(new byte[] {1});", tri, content));
}
else
{
throw new NotImplementedException();
}
break;
case KVReplayOperation.GetKeyIndex:
tri = _reader.ReadVUInt32();
break;
case KVReplayOperation.SetValue:
tri = _reader.ReadVUInt32();
int valOfs = _reader.ReadVInt32();
int valLen = _reader.ReadVInt32();
_reader.SkipBlock(valLen);
os.WriteLine(string.Format("tr{0}.SetValue(new byte[{1}]);", tri, valLen));
break;
case KVReplayOperation.Commit:
tri = _reader.ReadVUInt32();
os.WriteLine(string.Format("tr{0}.Commit();", tri));
break;
case KVReplayOperation.TransactionDispose:
tri = _reader.ReadVUInt32();
os.WriteLine(string.Format("tr{0}.Dispose();", tri));
break;
case KVReplayOperation.EraseCurrent:
tri = _reader.ReadVUInt32();
os.WriteLine(string.Format("tr{0}.EraseCurrent();", tri));
break;
case KVReplayOperation.FindPreviousKey:
tri = _reader.ReadVUInt32();
os.WriteLine(string.Format("tr{0}.FindPreviousKey();", tri));
break;
case KVReplayOperation.FindNextKey:
tri = _reader.ReadVUInt32();
os.WriteLine(string.Format("tr{0}.FindNextKey();", tri));
break;
default:
Console.WriteLine(string.Format("Unimplemented operation {0}({1})", operation, (byte)operation));
throw new NotSupportedException(string.Format("Unimplemented operation {0}({1})", operation, (byte)operation));
}
}
}
}