思考（六十九）：一种基于消息总线的功能可插拔的服务器架构

架构图

 +--------------------+           +----------------+             +----------------+
 |                    |           |     NODE 1     |             |     NODE 2     |
 | TOPIC ROUTE INFO   |           |                |             |                |
 |                    |           | TOPIC LOGIN    |             | TOPIC LOGIN    |
 |  LOGIN 1* - NODE1  |           |                |             | TOPIC CHAT     |
 |  LOGIN 5* - NODE2  +<----+     |                |             | TOPIC GAME     |
 |                    |     |     |                |             |                |
 |  ...               |     |     |                |             |                |
 |                    |     |     |                |             |                |
 +--------------------+     |     |                |             |                |
 +--------------------+     |     |                |             |                |
 |