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All Projects → firejq → MultiClientWebChat

firejq / MultiClientWebChat

Licence: AGPL-3.0 license
基于 Spring Websocket 和心跳保活重连的多人网页聊天室

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MultiClientWebChat

基于 Spring Websocket 和心跳保活重连的多人网页聊天室

Only for practice

Feature and Achieve

Schedule

  • Multiple client chat
  • Client reconnecting mechanism
  • Client keep alive and reconnect using heartbeat
  • MessageQueue broke

Multiple client chat

  • 当一个客户端打开，即建立一个与服务器的websocket连接，同时服务端将此 sessionId 加入到消息队列中
  • 当一个客户端发送信息时，服务器接收信息并将其广播给连接的所有客户端
  • 当一个客户端断开时，服务器将其从消息队列中移除

Client reconnecting mechanism

  • 若 client-server 通信发生中断，触发客户端onclose event，主动重连

Client keep alive and reconnect using heartbeat

存在这样的情况：

  • 超过一定的时间客户端和服务器之间没有发生任何消息传输，导致websocket连接自动断开。

  • websocket通信出错，但无法触发客户端 close 事件，导致客户端无法获知中断状况，编写在onclose中的重连逻辑也因此失效。

解决方法：设计客户端心跳保活+重连机制

客户端设置计时器，每次收到任何信息都将计时器归零，当计时器到时，发送一个心跳包（作用①保活，②检测连接状态），若服务器返回响应，则将计时器归零后重新启动；若服务器响应时间超时（认定为没有响应），则说明连接中断，执行重连逻辑。

MessageQueue broke

  • 使用专用消息队列作为消息中间层
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