int GetHashCodeInternal(bool ignoreMessageTime)
{
// The primary source of the hash is message's position. But it is not the only source,
// we have to use the other fields because messages might be at the same position
// but be different. That might happen, for example, when a message was at the end
// of the live stream and wasn't read completely. As the stream grows the same message
// will be fully written and might be eventually read again.
// Those two message might be different, thought they are at the same position.
int ret = Hashing.GetStableHashCode(position);
ret ^= text.GetStableHashCode();
if (!ignoreMessageTime)
{
ret = MessagesUtils.XORTimestampHash(ret, time);
}
if (thread != null)
{
ret ^= Hashing.GetStableHashCode(thread.ID);
}
ret ^= (int)(flags & MessageFlag.ContentTypeMask);
return(ret);
}
int GetHashCodeInternal(bool ignoreMessageTime)
{
// The primary source of the hash is message's position. But it is not the only source,
// we have to use the other fields because messages might be at the same position
// but be different. That might happen, for example, when a message was at the end
// of the live stream and wasn't read completely. As the stream grows the same message
// will be fully written and might be eventually read again.
// Those two message might be different, thought they are at the same position.
int ret = Hashing.GetStableHashCode(position);
// Don't hash Text for frame-end beacause it doesn't have its own permanent text.
// It takes the text from brame begin instead. The link to frame begin may change
// during the time (it may get null or not null).
if ((flags & MessageFlag.TypeMask) != MessageFlag.EndFrame)
{
ret ^= DoGetText().GetStableHashCode();
}
if (!ignoreMessageTime)
{
ret = MessagesUtils.XORTimestampHash(ret, time);
}
if (thread != null)
{
ret ^= Hashing.GetStableHashCode(thread.ID);
}
ret ^= (int)(flags & (MessageFlag.TypeMask | MessageFlag.ContentTypeMask));
return(ret);
}
public override int GetHashCode()
{
#if !SILVERLIGHT
return(Hashing.GetStableHashCode(str, index, length));
#else
return(Value.GetHashCode());
#endif
}
int IPositionedMessagesReader.GetContentsEtag()
{
VolatileStream.Position = 0;
byte[] buf = new byte[1024];
int read = VolatileStream.Read(buf, 0, buf.Length);
return(Hashing.GetStableHashCode(buf, 0, read));
}
async ValueTask <int> IPositionedMessagesReader.GetContentsEtag()
{
VolatileStream.Position = 0;
byte[] buf = new byte[1024];
int read = await VolatileStream.ReadAsync(buf, 0, buf.Length);
return(Hashing.GetStableHashCode(buf, 0, read));
}
public int GetStableHashCode()
{
if (data.Kind == DateTimeKind.Unspecified)
{
return(Hashing.GetStableHashCode(new DateTime(data.Ticks, DateTimeKind.Local)));
}
return(Hashing.GetStableHashCode(data));
}
public int GetStableHashCode()
{
return(Hashing.GetStableHashCode(str, index, length));
}
