RakNet framework

1. network communication, plugins that use network communication, and general game functionality.

    1) Network communication

        + RakPeerInterface

            - based on UDP, The primary class

            - connections, connection management

            - congestion control, remote server detection

            - out of band messaging

            - connection statistics

            - latency and packetloss simulation

            - secure connectivity        

        + TCPInterface

            - a wrapper for TCP

            - communicate with external systems based on the TCP.

            

    2) Plugins

            + an instance of RakPeer or PacketizedTCP

            + uses chain of responsibility design pattern

            + host determination

            + file transfers

            + NAT traversal

            + voice communication

            + remote procedure calls

            + game object replication

    

    3) RakPeer

        + the base functionality for UDP communication

        + two threads

            - wait for incoming datagrams

            - perform periodic updates, such as determing lost connections, pings

            - a Remote System structure

                - contains a class to manage congestion control

            - Connections are identified by SystemAddress or RakNetGuid

            - established through UDP messages, (a connection request payload & an 'offline message' identifier)

        + a connection requests arrives

            - RakPeer transmits internal state data

            - checks this connection

            - repeat connection list, security measures

            - ID_CONNECTION_REQUEST_ACCEPTED, or ID_NEW_INCOMING_CONNECTION

        + Outgoing messages

            - larger than the MTU, fragmented internally

            - Messages are sent in order of priority.

            - resends taking priority over new sends

        + incoming datagrams

            - using a blocking recvfrom thread

            - recorded timestamp

            - pushed a thread-safe queue

            - processed through the ReliabilityLayer class

                - congestion control

                - ACKS, NAKS, resends, encryption, reassembly of large messages

        + Connected messages are first processed

        + Calling RakPeer::Receive() to process one message

            - Message returned to the user are returned from RakPeer::Receive()

            - to call Receive() in a loop to get all messages

    4) NetworkIDObject

        + remote function calls

        + the ability for systems to refer to common objects

        + a 64 bit random number assigned

            - be used to lookup pointers through a hash

    5) SystemAddress struct

        + to represent remote systems

        + encoding of the IP address along with the port

    6) BitStream class

        + write single bits to a stream

        + automatic endian swapping

        + be enabled by commenting out  __BITSTREAM_NATIVE_END in RakNetDefines.h

    7) the architecture UML

        + file:///home/xxxx/devdir/raknet/RakNet-master/Help/RakNetUML.jpg

2. how to start

    1) Get one instance

            RakNet::RakPeerInterface* peer = RakNet::RakPeerInterface::GetInstance();

    2) Connect as client 

            peer->Startup(1, &SocketDescriptor(), 1)

            peer->Connect(serverIP, serverPort, 0, 0);

    

     

(not finish, will continue...)