Openfire源码分析----消息处理流程

    众所周知Openfire是基于mina编写的。因此直接找到ConnectionHandler,这个类继承IoHandlerAdapter。

熟悉mina的会知道接受消息并处理的方法为messageReceived。我们也只关心这个方法：

@Override
 public void messageReceived(IoSession session, Object message) throws Exception {
        // Get the stanza handler for this session
        StanzaHandler handler = (StanzaHandler) session.getAttribute(HANDLER);
        // Get the parser to use to process stanza. For optimization there is going
        // to be a parser for each running thread. Each Filter will be executed
        // by the Executor placed as the first Filter. So we can have a parser associated
        // to each Thread
        int hashCode = Thread.currentThread().hashCode();
        XMPPPacketReader parser = parsers.get(hashCode);
        if (parser == null) {
            parser = new XMPPPacketReader();
            parsers.put(hashCode, parser);
        }
        // Update counter of read btyes
        updateReadBytesCounter(session);
        //System.out.println("RCVD: " + message);
        // Let the stanza handler process the received stanza
        try {
            handler.process((String) message, parser);
        } catch (Exception e) {
            Log.error("Closing connection due to error while processing message: " + message, e);
            Connection connection = (Connection) session.getAttribute(CONNECTION);
            connection.close();
        }
    }

这个方法会调用StanzaHandler的process进行消息路由。

判断是否为权限包、消息包、状态包或者IQ包。对不同的包分发路由进行不同的处理。