如何在Java Spring Tomcat中快速关闭无响应的websocket？ [英] How do you quickly close a nonresponsive websocket in Java Spring Tomcat?

问题描述

我有一个实时应用程序，客户端使用websockets连接Spring Framework服务器，该服务器运行Spring Boot Tomcat。我希望服务器能够快速（在5秒内）检测到客户端由于网络断开或其他问题而停止响应并关闭websocket。

I have a real-time application with clients using websockets to connect with a Spring Framework server, which is running Spring Boot Tomcat. I want the server to quickly (within 5 seconds) detect when a client stops responding due to a network disconnect or other issue and close the websocket.

我试过

1. 将最大会话空闲超时设置为在文档中描述为配置WebSocket引擎
   http://docs.spring.io/spring/docs/current/spring-framework-reference/html/websocket.html

@Bean
public WebSocketHandler clientHandler() {
    return new PerConnectionWebSocketHandler(ClientHandler.class);
}
@Bean
public ServletServerContainerFactoryBean createWebSocketContainer() {
    ServletServerContainerFactoryBean container = 
        new ServletServerContainerFactoryBean();
    container.setMaxSessionIdleTimeout(5000);
    container.setAsyncSendTimeout(5000);
    return container;
}

我不确定这是正确实现的，因为我没有看到ServletServerContainerFactoryBean和我的一代ClientHandler之间的链接。

I am not sure this is implemented correctly because I do not see the link between the ServletServerContainerFactoryBean and my generation of ClientHandlers.

1. 每2.5秒从服务器发送ping消息。通过断开网络连接手动断开客户端后，服务器会愉快地发送ping 30秒以上，直到出现传输错误。

1. Sending ping messages from server every 2.5 seconds. After I manually disconnect the client by breaking the network connection, the server happily sends pings for another 30+ seconds until a transport error appears.

同时1和2

1和2并设置 server.session-timeout = 5 in application.properties

1 and 2 and setting server.session-timeout = 5 in application.properties

我的测试方法这是：

1. 将websocket从笔记本电脑客户端连接到Tomcat服务器


2. 关闭使用物理交换机在笔记本电脑上建立网络连接


3. 等待Tomcat服务器事件

Spring FrameworkTomcat服务器快速检测到客户端已断开连接或没有响应关闭websocket？

How does a Spring FrameworkTomcat server quickly detect that a client has been disconnected or not responding to close the websocket?

推荐答案

我最终采用的方法是实现应用层乒乓协议。

The approach I eventually took was to implement an application-layer ping-pong protocol.

• 服务器向客户端发送一段期限为 p 的ping消息。


• 客户端使用pong消息响应每条ping消息。


• 如果服务器发送超过 n ping消息而未收到pong响应，则会生成超时事件。


• 如果客户端在 n * p 时间内没有收到ping消息，也会生成超时事件。

• The server sends a ping message with period p to the client.
• The client responds to each ping message with a pong message.
• If the server sends more than n ping messages without receiving a pong response, it generates a timeout event.
• The client can also generate a timeout event if it does not receive a ping message in n*p time.

在底层TCP连接中使用超时应该有一种更简单的方法来实现它。

There should be a much simpler way of implementing this using timeouts in the underlying TCP connection.

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