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| <h1 id="211---server-architecture">2.1.1 - Server Architecture</h1> |
| <p>We have exposed the <strong>MINA</strong> Application Architecture in the previous section. Let’s now focus on the Server Architecture. Basically, a Server listens on a port for incoming requests, process them and send replies. It also creates and handles a session for each client (whenever we have a TCP or UDP based protocol), this will be explain more extensively in the <a href="../ch4-session/ch4-session.html">chapter 4</a>.</p> |
| <p><img src="/assets/img/mina/Server_arch.png" alt=""></p> |
| <ul> |
| <li>IOAcceptor listens on the network for incoming connections/packets</li> |
| <li>For a new connection, a new session is created and all subsequent request from IP Address/Port combination are handled in that Session</li> |
| <li>All packets received for a Session, traverses the Filter Chain as specified in the diagram. Filters can be used to modify the content of packets (like converting to Objects, adding/removing information etc). For converting to/from raw bytes to High Level Objects, PacketEncoder/Decoder are particularly useful</li> |
| <li>Finally the packet or converted object lands in <code>IOHandler</code>. <code>IOHandler</code>s can be used to fulfill business needs.</li> |
| </ul> |
| <h2 id="session-creation">Session creation</h2> |
| <p>Whenever a client connects on a MINA server, we will create a new session to store persistent data into it. Even if the protocol is not connected, this session will be created. The following schema shows how <strong>MINA</strong> handles incoming connections :</p> |
| <p><img src="/assets/img/mina/incoming-connections.png" alt="Incoming connections handling"></p> |
| <h2 id="incoming-messages-processing">Incoming messages processing</h2> |
| <p>We will now explain how <strong>MINA</strong> processes incoming messages.</p> |
| <p>Assuming that a session has been created, any new incoming message will result in a selector being waken up</p> |
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