/// <summary>
/// Commits the provided transaction
/// </summary>
public void CommitTransaction(ref TransactionToken token)
{
AssertionFailedException.Assert(token.State == StateOpen);
token.State = StateCommitted;
MemoryStream buffer = token.Object as MemoryStream;
if (buffer == null)
{
return; // nothing to commit
}
byte[] bytes = buffer.GetBuffer();
Crc32 crc = new Crc32();
crc.Add(bytes, 4, (int)buffer.Position - 4);
PrimitiveSerializer.Int32.WriteTo(crc.Value, buffer);
int len = (int)buffer.Position;
PrimitiveSerializer.Int32.WriteTo((0xee << 24) + len, buffer);
buffer.Position = 0;
PrimitiveSerializer.Int32.WriteTo((0xbb << 24) + len, buffer);
bytes = buffer.GetBuffer();
WriteBytes(bytes, 0, len + 4);
}
private void Write(ref TransactionToken token, OperationCode operation, TKey key, TValue value)
{
AssertionFailedException.Assert(token.State == StateOpen);
MemoryStream buffer = token.Object as MemoryStream;
if (buffer == null)
{
token.Object = buffer = new MemoryStream();
PrimitiveSerializer.Int32.WriteTo(0, buffer);
PrimitiveSerializer.Int32.WriteTo(unchecked ((int)token.Handle), buffer);
PrimitiveSerializer.Int16.WriteTo(0, buffer);
}
PrimitiveSerializer.Int16.WriteTo((short)operation, buffer);
_options.KeySerializer.WriteTo(key, buffer);
if (operation != OperationCode.Remove)
{
_options.ValueSerializer.WriteTo(value, buffer);
}
//Increment the operation counter at offset 8
long pos = buffer.Position;
buffer.Position = 8;
short count = PrimitiveSerializer.Int16.ReadFrom(buffer);
buffer.Position = 8;
PrimitiveSerializer.Int16.WriteTo(++count, buffer);
buffer.Position = pos;
}
public void RemoveValue(TKey key)
{
if (_cache.Options.LogFile != null)
{
if (!_hasLogToken)
{
_logToken = _cache.Options.LogFile.BeginTransaction();
}
_hasLogToken = true;
_cache.Options.LogFile.RemoveValue(ref _logToken, key);
}
}
public void UpdateValue(TKey key, TValue value)
{
if (_cache.Options.LogFile != null)
{
if (!_hasLogToken)
{
_logToken = _cache.Options.LogFile.BeginTransaction();
}
_hasLogToken = true;
_cache.Options.LogFile.UpdateValue(ref _logToken, key, value);
}
}
/// <summary>
/// Abandons the provided transaction
/// </summary>
public void RollbackTransaction(ref TransactionToken token)
{
if (token.State == StateRolledback)
{
return;
}
AssertionFailedException.Assert(token.State == StateOpen);
token.State = StateRolledback;
MemoryStream buffer = token.Object as MemoryStream;
if (buffer != null)
{
buffer.Dispose();
}
token.Object = null;
token.Handle = 0;
}
/// <summary> The provided key/value pair was removed in the provided transaction </summary>
public void RemoveValue(ref TransactionToken token, TKey key)
{
Write(ref token, OperationCode.Remove, key, default(TValue));
}
/// <summary> The provided key/value pair was updated in the provided transaction </summary>
public void UpdateValue(ref TransactionToken token, TKey key, TValue value)
{
Write(ref token, OperationCode.Update, key, value);
}
/// <summary> The provided key/value pair was added in the provided transaction </summary>
public void AddValue(ref TransactionToken token, TKey key, TValue value)
{
Write(ref token, OperationCode.Add, key, value);
}
public NodeTransaction(NodeCacheBase cache)
{
_cache = cache;
_hasLogToken = false;
_logToken = new TransactionToken();
}