/// <summary>
/// This is the method that is invoked on an IPacketFactory to create an IPacket
/// from the data in an IFieldReader given a specified PacketDefinition.
/// </summary>
/// <param name="definition">Definition of the fields expected in the next packet</param>
/// <param name="reader">Data stream to be read</param>
/// <returns>An IPacket corresponding to the PacketDefinition and the stream data</returns>
public IPacket CreatePacket(PacketDefinition definition, IFieldReader reader)
{
IPacket packet;
//what we create varies by what specific definition they're looking for
if (definition.TypeName == m_LogMessagePacketType)
{
var logPacket = new LogMessagePacket(m_SessionPacketCache);
packet = logPacket;
if (!ReferenceEquals(definition, m_CachedLogMessagePacketDefinition))
{
var currentDefinition = PacketDefinition.CreatePacketDefinition(packet);
m_UseFastDeserialization = definition.Equals(currentDefinition);
m_CachedLogMessagePacketDefinition = definition;
}
if (m_UseFastDeserialization)
{
logPacket.ReadFieldsFast(reader);
}
else
{
definition.ReadFields(packet, reader);
}
}
else if (definition.TypeName == m_ExceptionInfoPacketType)
{
packet = new ExceptionInfoPacket();
definition.ReadFields(packet, reader);
}
else if (definition.TypeName == m_ApplicationUserPacketType)
{
packet = new ApplicationUserPacket();
definition.ReadFields(packet, reader);
}
else
{
//crap, we don't know what to do here.
throw new ArgumentOutOfRangeException(nameof(definition), definition.TypeName, "This packet factory doesn't understand how to create packets for the provided type.");
}
return(packet);
}
private Dictionary <IPacket, IPacket> GetRequiredPackets(IPacket packet)
{
PacketDefinition previewDefinition;
int previewTypeIndex = m_CachedTypes.IndexOf(packet);
if (previewTypeIndex < 0)
{
previewDefinition = PacketDefinition.CreatePacketDefinition(packet);
m_CachedTypes.Add(previewDefinition);
}
else
{
previewDefinition = m_CachedTypes[previewTypeIndex];
}
Dictionary <IPacket, IPacket> requiredPackets = previewDefinition.GetRequiredPackets(packet);
return(requiredPackets);
}
