Spring Stomp over Websocket：消息/缓冲区/缓存/流限制

Question

无法理解我用于开发涉及图像/视频的聊天应用程序的 stomp over websocket 配置中的不同参数：

我注意到网页中的 SockJs 发送帧大小为 16K 的消息。我还测试了消息大小限制决定了我可以传输的最大消息大小。

请告诉我是什么：

1. 流字节数限制

2. 发送缓冲区大小限制

3. http 消息缓存大小

4. 什么是部分消息以及如何使用它们，它们在这里有用吗？

5. 我还计划将图像/视频的最大大小设置为 2GB，并预计在我发布时同时有大约 100 个用户。

您能否告诉我们我应该保留什么尺寸以及为什么？什么是默认值？以及它们各自会如何影响我的聊天应用程序的性能？

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/stomp").withSockJS()
            .setStreamBytesLimit(15 * 1024)
            .setHttpMessageCacheSize(15 * 1024);
}

@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
    registry.enableSimpleBroker("/queue/", "/topic/", "/exchange/");
    registry.setApplicationDestinationPrefixes("/app");
}

@Override
public void configureWebSocketTransport(WebSocketTransportRegistration registration) {
    registration.setSendTimeLimit(15 * 1000)
            .setSendBufferSizeLimit(1 * 1024)
            // max message size 2GB (2048 bytes) : default is 64KB
            .setMessageSizeLimit(2 * 1024 * 1024);
}

}

Answer 1

用我的发现和实施回答问题：

在以下配置中：

@Override
public void configureWebSocketTransport(WebSocketTransportRegistration registration) {
    registration.setSendTimeLimit(60 * 1000)
            .setSendBufferSizeLimit(200 * 1024 * 1024)
            .setMessageSizeLimit(200 * 1024 * 1024);
}

1. 流字节限制：来自源的信息

   /**
    * Streaming transports save responses on the client side and don't free
    * memory used by delivered messages. Such transports need to recycle the
    * connection once in a while. This property sets a minimum number of bytes
    * that can be send over a single HTTP streaming request before it will be
    * closed. After that client will open a new request. Setting this value to
    * one effectively disables streaming and will make streaming transports to
    * behave like polling transports.
    * <p>The default value is 128K (i.e. 128 * 1024).
    */
   public SockJsServiceRegistration setStreamBytesLimit(int streamBytesLimit) {
       this.streamBytesLimit = streamBytesLimit;
       return this;
   }
   

2. 发送缓冲区大小限制 默认为 512KB。如果消息发送速度较慢，则缓冲后续消息，直到达到 sendTimeLimit 或 sendBufferSizeLimit。

3. http 消息缓存大小：来自源的信息

   /**
    * The number of server-to-client messages that a session can cache while waiting for
    * the next HTTP polling request from the client. All HTTP transports use this
    * property since even streaming transports recycle HTTP requests periodically.
    * <p>The amount of time between HTTP requests should be relatively brief and will not
    * exceed the allows disconnect delay (see
    * {@link #setDisconnectDelay(long)}), 5 seconds by default.
    * <p>The default size is 100.
    */
   public SockJsServiceRegistration setHttpMessageCacheSize(int httpMessageCacheSize) {
       this.httpMessageCacheSize = httpMessageCacheSize;
       return this;
   }
   

4. 什么是部分消息以及如何使用它们，它们在这里有用吗？ 仍然不确定如何通过 websocket 流式传输大文件并使用部分消息传递（决定使用 HTTP 代替）

5. 我还计划将图像/视频的最大大小设置为 2GB，并在我发布时预计同时有大约 100 个用户。 => 由 messageSizeLimit 设置 并使用 HTTP 进行文件上传/流式下载。还可以使用 apache file-upload config 设置服务器限制：

   //set up the server limits using apache file-upload config
   @Bean
   public CommonsMultipartResolver multipartResolver() {
       CommonsMultipartResolver resolver = new CommonsMultipartResolver();
       resolver.setMaxUploadSize(2 * 1024 * 1024 * 1024); // 2 GB limit set for file upload
       resolver.setDefaultEncoding("utf-8");
       return resolver;
       }