{"id":1990,"date":"2023-04-01T10:54:51","date_gmt":"2023-04-01T02:54:51","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1990"},"modified":"2023-04-22T07:41:42","modified_gmt":"2023-04-21T23:41:42","slug":"understanding-long-polling-how-does-the-configuration-center-implement-push","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/04\/01\/understanding-long-polling-how-does-the-configuration-center-implement-push\/","title":{"rendered":"\u8ba4\u8bc6\u957f\u8f6e\u8be2\uff1a\u914d\u7f6e\u4e2d\u5fc3\u662f\u5982\u4f55\u5b9e\u73b0\u63a8\u9001\u7684\uff1f"},"content":{"rendered":"<h2>\u524d\u8a00<\/h2>\n<p>\u4f20\u7edf\u7684\u9759\u6001\u914d\u7f6e\u65b9\u5f0f\u60f3\u8981\u4fee\u6539\u67d0\u4e2a\u914d\u7f6e\u65f6\uff0c\u5fc5\u987b\u91cd\u65b0\u542f\u52a8\u4e00\u6b21\u5e94\u7528\uff0c\u5982\u679c\u662f\u6570\u636e\u5e93\u8fde\u63a5\u4e32\u7684\u53d8\u66f4\uff0c\u90a3\u53ef\u80fd\u8fd8\u5bb9\u6613\u63a5\u53d7\u4e00\u4e9b\uff0c\u4f46\u5982\u679c\u53d8\u66f4\u7684\u662f\u4e00\u4e9b\u8fd0\u884c\u65f6\u5b9e\u65f6\u611f\u77e5\u7684\u914d\u7f6e\uff0c\u5982\u67d0\u4e2a\u529f\u80fd\u9879\u7684\u5f00\u5173\uff0c\u91cd\u542f\u5e94\u7528\u5c31\u663e\u5f97\u6709\u70b9\u5927\u52a8\u5e72\u6208\u4e86\u3002\u914d\u7f6e\u4e2d\u5fc3\u6b63\u662f\u4e3a\u4e86\u89e3\u51b3\u6b64\u7c7b\u95ee\u9898\u5e94\u8fd0\u800c\u751f\u7684\uff0c\u7279\u522b\u662f\u5728\u5fae\u670d\u52a1\u67b6\u6784\u4f53\u7cfb\u4e2d\uff0c\u66f4\u503e\u5411\u4e8e\u4f7f\u7528\u914d\u7f6e\u4e2d\u5fc3\u6765\u7edf\u4e00\u7ba1\u7406\u914d\u7f6e\u3002<\/p>\n<p><!-- 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HTTP \u8bf7\u6c42\uff0c\u8bf7\u6c42\u4fe1\u606f\u5305\u542b\u914d\u7f6e\u4e2d\u5fc3\u7684\u5730\u5740\uff0c\u4ee5\u53ca\u76d1\u542c\u7684 dataId\uff08\u672c\u6587\u51fa\u4e8e\u7b80\u5316\u8bf4\u660e\u7684\u8003\u8651\uff0c\u8ba4\u4e3a dataId \u662f\u5b9a\u4f4d\u914d\u7f6e\u7684\u552f\u4e00\u952e\uff09\u3002\u82e5\u914d\u7f6e\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u4e4b\u95f4\u4e00\u76f4\u5904\u4e8e\u8fde\u63a5\u72b6\u6001\u3002<\/p>\n<h3>\u670d\u52a1\u7aef\u76d1\u542c\u6570\u636e\u53d8\u5316<\/h3>\n<p>\u670d\u52a1\u7aef\u4f1a\u7ef4\u62a4 dataId \u548c\u957f\u8f6e\u8be2\u7684\u6620\u5c04\u5173\u7cfb\uff0c\u5982\u679c\u914d\u7f6e\u53d1\u751f\u53d8\u5316\uff0c\u670d\u52a1\u7aef\u4f1a\u627e\u5230\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u4e3a\u54cd\u5e94\u5199\u5165\u66f4\u65b0\u540e\u7684\u914d\u7f6e\u5185\u5bb9\u3002\u5982\u679c\u8d85\u65f6\u5185\u914d\u7f6e\u672a\u53d1\u751f\u53d8\u5316\uff0c\u670d\u52a1\u7aef\u627e\u5230\u5bf9\u5e94\u7684\u8d85\u65f6\u957f\u8f6e\u8be2\u8fde\u63a5\uff0c\u5199\u5165 304 \u54cd\u5e94\u3002<\/p>\n<blockquote>\n<p>304 \u5728 HTTP \u54cd\u5e94\u7801\u4e2d\u4ee3\u8868\u201c\u672a\u6539\u53d8\u201d\uff0c\u5e76\u4e0d\u4ee3\u8868\u9519\u8bef\u3002\u6bd4\u8f83\u5951\u5408\u957f\u8f6e\u8be2\u65f6\uff0c\u914d\u7f6e\u672a\u53d1\u751f\u53d8\u66f4\u7684\u573a\u666f\u3002<\/p>\n<\/blockquote>\n<h3>\u5ba2\u6237\u7aef\u63a5\u6536\u957f\u8f6e\u8be2\u54cd\u5e94<\/h3>\n<p>\u9996\u5148\u67e5\u770b\u54cd\u5e94\u7801\u662f 200 \u8fd8\u662f 304\uff0c\u4ee5\u5224\u65ad\u914d\u7f6e\u662f\u5426\u53d8\u66f4\uff0c\u505a\u51fa\u76f8\u5e94\u7684\u56de\u8c03\u3002\u4e4b\u540e\u518d\u6b21\u53d1\u8d77\u4e0b\u4e00\u6b21\u957f\u8f6e\u8be2\u3002<\/p>\n<h3>\u670d\u52a1\u7aef\u8bbe\u7f6e\u914d\u7f6e\u5199\u5165\u7684\u63a5\u5165\u70b9<\/h3>\n<p>\u4e3b\u8981\u7528\u914d\u7f6e\u63a7\u5236\u53f0\u548c client \u53d1\u5e03\u914d\u7f6e\uff0c\u89e6\u53d1\u914d\u7f6e\u53d8\u66f4\u3002<\/p>\n<p>\u8fd9\u51e0\u70b9\u4fbf\u662f\u914d\u7f6e\u4e2d\u5fc3\u5b9e\u73b0\u957f\u8f6e\u8be2\u7684\u6838\u5fc3\u6b65\u9aa4\uff0c\u4e5f\u662f\u6307\u5bfc\u4e0b\u9762\u7ae0\u8282\u4ee3\u7801\u5b9e\u73b0\u7684\u5173\u952e\u3002\u4f46\u5728\u7f16\u7801\u4e4b\u524d\uff0c\u4ecd\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u6ce8\u610f\u70b9\u9700\u8981\u5b9e\u73b0\u9610\u660e\u3002<\/p>\n<p>\u914d\u7f6e\u4e2d\u5fc3\u5f80\u5f80\u662f\u4e3a\u5206\u5e03\u5f0f\u7684\u96c6\u7fa4\u63d0\u4f9b\u670d\u52a1\u7684\uff0c\u800c\u6bcf\u4e2a\u673a\u5668\u4e0a\u90e8\u7f72\u7684\u5e94\u7528\uff0c\u53c8\u4f1a\u6709\u591a\u4e2a dataId \u9700\u8981\u76d1\u542c\uff0c\u5b9e\u4f8b\u7ea7\u522b * \u914d\u7f6e\u6570\u662f\u4e00\u4e2a\u4e0d\u5c0f\u7684\u6570\u5b57\uff0c\u914d\u7f6e\u4e2d\u5fc3\u670d\u52a1\u7aef\u7ef4\u62a4\u8fd9\u4e9b dataId \u7684\u957f\u8f6e\u8be2\u8fde\u63a5\u663e\u7136\u4e0d\u80fd\u7528\u7ebf\u7a0b\u4e00\u4e00\u5bf9\u5e94\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4\u670d\u52a1\u7aef\u7ebf\u7a0b\u6570\u7206\u70b8\u5f0f\u589e\u957f\u3002\u4e00\u4e2a Tomcat \u4e5f\u5c31 200 \u4e2a\u7ebf\u7a0b\uff0c\u957f\u8f6e\u8be2\u4e5f\u4e0d\u5e94\u8be5\u963b\u585e Tomcat \u7684\u4e1a\u52a1\u7ebf\u7a0b\uff0c\u6240\u4ee5\u9700\u8981\u914d\u7f6e\u4e2d\u5fc3\u5728\u5b9e\u73b0\u957f\u8f6e\u8be2\u65f6\uff0c\u5f80\u5f80\u91c7\u7528\u5f02\u6b65\u54cd\u5e94\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002\u800c\u6bd4\u8f83\u65b9\u4fbf\u5b9e\u73b0\u5f02\u6b65 HTTP \u7684\u5e38\u89c1\u624b\u6bb5\u4fbf\u662f Servlet3.0 \u63d0\u4f9b\u7684 AsyncContext \u673a\u5236\u3002<\/p>\n<blockquote>\n<p>Servlet3.0 \u5e76\u4e0d\u662f\u4e00\u4e2a\u7279\u522b\u65b0\u7684\u89c4\u8303\uff0c\u5b83\u8ddf Java 6 \u662f\u540c\u4e00\u65f6\u671f\u7684\u4ea7\u7269\u3002\u4f8b\u5982 SpringBoot \u5185\u5d4c\u7684 Tomcat \u5f88\u65e9\u5c31\u652f\u6301\u4e86 Servlet3.0\uff0c\u65e0\u9700\u62c5\u5fc3 AsyncContext \u673a\u5236\u4e0d\u8d77\u4f5c\u7528\u3002<\/p>\n<\/blockquote>\n<p>SpringMVC \u5b9e\u73b0\u4e86 DeferredResult \u548c Servlet3.0 \u63d0\u4f9b\u7684 AsyncContext \u5176\u5b9e\u6ca1\u6709\u591a\u5927\u533a\u522b\uff0c\u6211\u5e76\u6ca1\u6709\u6df1\u5165\u7814\u7a76\u8fc7\u4e24\u4e2a\u5b9e\u73b0\u80cc\u540e\u7684\u6e90\u7801\uff0c\u4f46\u4ece\u4f7f\u7528\u5c42\u9762\u4e0a\u6765\u770b\uff0cAsyncContext \u66f4\u52a0\u7684\u7075\u6d3b\uff0c\u4f8b\u5982\u5176\u53ef\u4ee5\u81ea\u5b9a\u4e49\u54cd\u5e94\u7801\uff0c\u800c DeferredResult \u5728\u4e0a\u5c42\u505a\u4e86\u5c01\u88c5\uff0c\u53ef\u4ee5\u5feb\u901f\u7684\u5e2e\u52a9\u5f00\u53d1\u8005\u5b9e\u73b0\u4e00\u4e2a\u5f02\u6b65\u54cd\u5e94\uff0c\u4f46\u6ca1\u6cd5\u7ec6\u7c92\u5ea6\u5730\u63a7\u5236\u54cd\u5e94\u3002\u6240\u4ee5\u4e0b\u6587\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u9009\u62e9\u4e86 AsyncContext\u3002<\/p>\n<h2>\u914d\u7f6e\u4e2d\u5fc3\u957f\u8f6e\u8be2\u5b9e\u73b0<\/h2>\n<h3>\u5ba2\u6237\u7aef\u5b9e\u73b0<\/h3>\n<pre><code class=\"language-java\">@Slf4j\npublic class ConfigClient {\n\n    private CloseableHttpClient httpClient;\n    private RequestConfig requestConfig;\n\n    public ConfigClient() {\n        this.httpClient = HttpClientBuilder.create().build();\n        \/\/ \u2460 httpClient \u5ba2\u6237\u7aef\u8d85\u65f6\u65f6\u95f4\u8981\u5927\u4e8e\u957f\u8f6e\u8be2\u7ea6\u5b9a\u7684\u8d85\u65f6\u65f6\u95f4\n        this.requestConfig = RequestConfig.custom().setSocketTimeout(40000).build();\n    }\n\n    @SneakyThrows\n    public void longPolling(String url, String dataId) {\n        String endpoint = url + &quot;?dataId=&quot; + dataId;\n        HttpGet request = new HttpGet(endpoint);\n        CloseableHttpResponse response = httpClient.execute(request);\n        switch (response.getStatusLine().getStatusCode()) {\n            case 200: {\n                BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity()\n                    .getContent()));\n                StringBuilder result = new StringBuilder();\n                String line;\n                while ((line = rd.readLine()) != null) {\n                    result.append(line);\n                }\n                response.close();\n                String configInfo = result.toString();\n                log.info(&quot;dataId: [{}] changed, receive configInfo: {}&quot;, dataId, configInfo);\n                longPolling(url, dataId);\n                break;\n            }\n            \/\/ \u2461 304 \u54cd\u5e94\u7801\u6807\u8bb0\u914d\u7f6e\u672a\u53d8\u66f4\n            case 304: {\n                log.info(&quot;longPolling dataId: [{}] once finished, configInfo is unchanged, longPolling again&quot;, dataId);\n                longPolling(url, dataId);\n                break;\n            }\n            default: {\n                throw new RuntimeException(&quot;unExcepted HTTP status code&quot;);\n            }\n        }\n\n    }\n\n    public static void main(String[] args) {\n        \/\/ httpClient \u4f1a\u6253\u5370\u5f88\u591a debug \u65e5\u5fd7\uff0c\u5173\u95ed\u6389\n        Logger logger = (Logger) LoggerFactory.getLogger(&quot;org.apache.http&quot;);\n        logger.setLevel(Level.INFO);\n        logger.setAdditive(false);\n\n        ConfigClient configClient = new ConfigClient();\n        \/\/ \u2462 \u5bf9 dataId: user \u8fdb\u884c\u914d\u7f6e\u76d1\u542c \n        configClient.longPolling(&quot;http:\/\/127.0.0.1:8080\/listener&quot;, &quot;user&quot;);\n    }\n\n}<\/code><\/pre>\n<p>\u4e3b\u8981\u6709\u4e09\u4e2a\u6ce8\u610f\u70b9\uff1a<\/p>\n<ul>\n<li><code>RequestConfig.custom().setSocketTimeout(40000).build()<\/code>\uff1ahttpClient \u5ba2\u6237\u7aef\u8d85\u65f6\u65f6\u95f4\u8981\u5927\u4e8e\u957f\u8f6e\u8be2\u7ea6\u5b9a\u7684\u8d85\u65f6\u65f6\u95f4\u3002\u5f88\u597d\u7406\u89e3\uff0c\u4e0d\u7136\u8fd8\u6ca1\u7b49\u670d\u52a1\u7aef\u8fd4\u56de\uff0c\u5ba2\u6237\u7aef\u4f1a\u81ea\u884c\u65ad\u5f00 HTTP \u8fde\u63a5<\/li>\n<li><code>response.getStatusLine().getStatusCode() == 304<\/code>\uff1a\u524d\u6587\u4ecb\u7ecd\u8fc7\uff0c\u7ea6\u5b9a\u4f7f\u7528 304 \u54cd\u5e94\u7801\u6765\u6807\u8bc6\u914d\u7f6e\u672a\u53d1\u751f\u53d8\u66f4\uff0c\u5ba2\u6237\u7aef\u7ee7\u7eed\u53d1\u8d77\u957f\u8f6e\u8be2<\/li>\n<li><code>configClient.longPolling(&quot;http:\/\/127.0.0.1:8080\/listener&quot;, &quot;user&quot;)<\/code>\uff1a\u5728\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5904\u4e8e\u7b80\u5355\u8003\u8651\uff0c\u4ec5\u4ec5\u542f\u52a8\u4e00\u4e2a\u5ba2\u6237\u7aef\uff0c\u5bf9\u5355\u4e00\u7684 dataId:user \u8fdb\u884c\u76d1\u542c\uff08\u6ce8\u610f\uff0c\u9700\u8981\u5148\u542f\u52a8 server \u7aef\uff09<\/li>\n<\/ul>\n<h3>\u670d\u52a1\u7aef\u5b9e\u73b0<\/h3>\n<pre><code class=\"language-java\">@RestController\n@Slf4j\n@SpringBootApplication\npublic class ConfigServer {\n\n    @Data\n    private static class AsyncTask {\n        \/\/ \u957f\u8f6e\u8be2\u8bf7\u6c42\u7684\u4e0a\u4e0b\u6587\uff0c\u5305\u542b\u8bf7\u6c42\u548c\u54cd\u5e94\u4f53\n        private AsyncContext asyncContext;\n        \/\/ \u8d85\u65f6\u6807\u8bb0\n        private boolean timeout;\n\n        public AsyncTask(AsyncContext asyncContext, boolean timeout) {\n            this.asyncContext = asyncContext;\n            this.timeout = timeout;\n        }\n    }\n\n    \/\/ guava \u63d0\u4f9b\u7684\u591a\u503c Map\uff0c\u4e00\u4e2a key \u53ef\u4ee5\u5bf9\u5e94\u591a\u4e2a value\n    private Multimap&lt;String, AsyncTask&gt; dataIdContext = Multimaps.synchronizedSetMultimap(HashMultimap.create());\n\n    private ThreadFactory threadFactory = new ThreadFactoryBuilder().setNameFormat(&quot;longPolling-timeout-checker-%d&quot;)\n        .build();\n    private ScheduledExecutorService timeoutChecker = new ScheduledThreadPoolExecutor(1, threadFactory);\n\n    \/\/ \u914d\u7f6e\u76d1\u542c\u63a5\u5165\u70b9\n    @RequestMapping(&quot;\/listener&quot;)\n    public void addListener(HttpServletRequest request, HttpServletResponse response) {\n\n        String dataId = request.getParameter(&quot;dataId&quot;);\n\n        \/\/ \u5f00\u542f\u5f02\u6b65\n        AsyncContext asyncContext = request.startAsync(request, response);\n        AsyncTask asyncTask = new AsyncTask(asyncContext, true);\n\n        \/\/ \u7ef4\u62a4 dataId \u548c\u5f02\u6b65\u8bf7\u6c42\u4e0a\u4e0b\u6587\u7684\u5173\u8054\n        dataIdContext.put(dataId, asyncTask);\n\n        \/\/ \u542f\u52a8\u5b9a\u65f6\u5668\uff0c30s \u540e\u5199\u5165 304 \u54cd\u5e94\n        timeoutChecker.schedule(() -&gt; {\n            if (asyncTask.isTimeout()) {\n                dataIdContext.remove(dataId, asyncTask);\n                response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);\n                asyncContext.complete();\n            }\n        }, 30000, TimeUnit.MILLISECONDS);\n    }\n\n    \/\/ \u914d\u7f6e\u53d1\u5e03\u63a5\u5165\u70b9\n    @RequestMapping(&quot;\/publishConfig&quot;)\n    @SneakyThrows\n    public String publishConfig(String dataId, String configInfo) {\n        log.info(&quot;publish configInfo dataId: [{}], configInfo: {}&quot;, dataId, configInfo);\n        Collection&lt;AsyncTask&gt; asyncTasks = dataIdContext.removeAll(dataId);\n        for (AsyncTask asyncTask : asyncTasks) {\n            asyncTask.setTimeout(false);\n            HttpServletResponse response = (HttpServletResponse)asyncTask.getAsyncContext().getResponse();\n            response.setStatus(HttpServletResponse.SC_OK);\n            response.getWriter().println(configInfo);\n            asyncTask.getAsyncContext().complete();\n        }\n        return &quot;success&quot;;\n    }\n\n    public static void main(String[] args) {\n        SpringApplication.run(ConfigServer.class, args);\n    }\n\n}<\/code><\/pre>\n<p>\u5bf9\u4e0a\u8ff0\u5b9e\u73b0\u7684\u4e00\u4e9b\u8bf4\u660e\uff1a<\/p>\n<ul>\n<li><code>@RequestMapping(&quot;\/listener&quot;)<\/code>\uff0c\u914d\u7f6e\u76d1\u542c\u63a5\u5165\u70b9\uff0c\u4e5f\u662f\u957f\u8f6e\u8be2\u7684\u5165\u53e3\u3002\u5728\u83b7\u53d6 dataId \u4e4b\u540e\uff0c\u4f7f\u7528<code>request.startAsync<\/code>\u5c06\u8bf7\u6c42\u8bbe\u7f6e\u4e3a\u5f02\u6b65\uff0c\u8fd9\u6837\u5728\u65b9\u6cd5\u7ed3\u675f\u540e\uff0c\u4e0d\u4f1a\u5360\u7528 Tomcat \u7684\u7ebf\u7a0b\u6c60<\/li>\n<li>\u63a5\u7740<code>dataIdContext.put(dataId, asyncTask)<\/code>\u4f1a\u5c06 dataId \u548c\u5f02\u6b65\u8bf7\u6c42\u4e0a\u4e0b\u6587\u7ed9\u5173\u8054\u8d77\u6765\uff0c\u65b9\u4fbf\u914d\u7f6e\u53d1\u5e03\u65f6\uff0c\u62ff\u5230\u5bf9\u5e94\u7684\u4e0a\u4e0b\u6587\u3002\u6ce8\u610f\u8fd9\u91cc\u4f7f\u7528\u4e86\u4e00\u4e2a guava \u63d0\u4f9b\u7684\u6570\u636e\u7ed3\u6784<code>Multimap&lt;String, AsyncTask&gt; dataIdContext<\/code>\uff0c\u5b83\u662f\u4e00\u4e2a\u591a\u503c Map\uff0c\u4e00\u4e2a key \u53ef\u4ee5\u5bf9\u5e94\u591a\u4e2a value\uff0c\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a<code>Map&lt;String, List&lt;AsyncTask&gt;&gt;<\/code>\uff0c\u4f46\u4f7f\u7528 Multimap \u7ef4\u62a4\u8d77\u6765\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u5904\u7406\u4e00\u4e9b\u5e76\u53d1\u903b\u8f91\u3002\u81f3\u4e8e\u4e3a\u4ec0\u4e48\u4f1a\u6709\u591a\u503c\uff0c\u5f88\u597d\u7406\u89e3\uff0c\u56e0\u4e3a\u914d\u7f6e\u4e2d\u5fc3\u7684 Server \u7aef\u4f1a\u63a5\u53d7\u6765\u81ea\u591a\u4e2a\u5ba2\u6237\u7aef\u5bf9\u540c\u4e00\u4e2a dataId \u7684\u76d1\u542c<\/li>\n<li><code>timeoutChecker.schedule()<\/code>\u542f\u52a8\u5b9a\u65f6\u5668\uff0c30s \u540e\u5199\u5165 304 \u54cd\u5e94\u3002\u518d\u7ed3\u5408\u4e4b\u524d\u5ba2\u6237\u7aef\u7684\u903b\u8f91\uff0c\u63a5\u6536\u5230 304 \u4e4b\u540e\uff0c\u4f1a\u91cd\u65b0\u53d1\u8d77\u957f\u8f6e\u8be2\uff0c\u5f62\u6210\u4e00\u4e2a\u5faa\u73af<\/li>\n<li><code>@RequestMapping(&quot;\/publishConfig&quot;)<\/code>\uff0c\u914d\u7f6e\u53d1\u5e03\u7684\u5165\u53e3\u3002\u914d\u7f6e\u53d8\u66f4\u540e\uff0c\u6839\u636e dataId \u4e00\u6b21\u62ff\u51fa\u6240\u6709\u7684\u957f\u8f6e\u8be2\uff0c\u4e3a\u4e4b\u5199\u5165\u53d8\u66f4\u7684\u54cd\u5e94\uff0c\u540c\u65f6\u4e0d\u8981\u5fd8\u8bb0\u53d6\u6d88\u5b9a\u65f6\u4efb\u52a1\u3002\u81f3\u6b64\uff0c\u5b8c\u6210\u4e86\u4e00\u4e2a\u914d\u7f6e\u53d8\u66f4\u540e\u63a8\u9001\u7684\u6d41\u7a0b\u3002<\/li>\n<\/ul>\n<h3>\u542f\u52a8\u914d\u7f6e\u76d1\u542c<\/h3>\n<p>\u5148\u542f\u52a8 ConfigServer\uff0c\u518d\u542f\u52a8 ConfigClient\u3002\u5ba2\u6237\u7aef\u6253\u5370\u957f\u8f6e\u8be2\u7684\u65e5\u5fd7\u5982\u4e0b\uff1a<\/p>\n<pre><code>22:18:09.185 [main] INFO moe.cnkirito.demo.ConfigClient - longPolling dataId: [user] once finished, configInfo is unchanged, longPolling again\n22:18:39.197 [main] INFO moe.cnkirito.demo.ConfigClient - longPolling dataId: [user] once finished, configInfo is unchanged, longPolling again<\/code><\/pre>\n<p>\u53d1\u5e03\u4e00\u6761\u914d\u7f6e\uff1a<\/p>\n<pre><code>curl -X GET &quot;localhost:8080\/publishConfig?dataId=user&amp;configInfo=helloworld&quot;<\/code><\/pre>\n<p>\u670d\u52a1\u7aef\u6253\u5370\u65e5\u5fd7\u5982\u4e0b\uff1a<\/p>\n<pre><code>2021-01-24 22:18:50.801  INFO 73301 --- [nio-8080-exec-6] moe.cnkirito.demo.ConfigServer           : publish configInfo dataId: [user], configInfo: helloworld<\/code><\/pre>\n<p>\u5ba2\u6237\u7aef\u63a5\u53d7\u914d\u7f6e\u63a8\u9001\uff1a<\/p>\n<pre><code>22:18:50.806 [main] INFO moe.cnkirito.demo.ConfigClient - dataId: [user] changed, receive configInfo: helloworld<\/code><\/pre>\n<h2>\u5b9e\u73b0\u7ec6\u8282\u601d\u8003<\/h2>\n<h3>\u4e3a\u4ec0\u4e48\u9700\u8981\u5b9a\u65f6\u5668\u8fd4\u56de 304<\/h3>\n<p>\u4e0a\u8ff0\u7684\u5b9e\u73b0\u4e2d\uff0c\u670d\u52a1\u7aef\u91c7\u7528\u4e86\u4e00\u4e2a\u5b9a\u65f6\u5668\uff0c\u5728\u914d\u7f6e\u672a\u53d1\u751f\u53d8\u66f4\u65f6\uff0c\u5b9a\u65f6\u8fd4\u56de 304\uff0c\u5ba2\u6237\u7aef\u63a5\u6536\u5230 304 \u4e4b\u540e\uff0c\u91cd\u65b0\u53d1\u8d77\u957f\u8f6e\u8be2\u3002\u5728\u524d\u6587\uff0c\u5df2\u7ecf\u89e3\u91ca\u8fc7\u4e86\u4e3a\u4ec0\u4e48\u9700\u8981\u8d85\u65f6\u540e\u91cd\u65b0\u53d1\u8d77\u957f\u8f6e\u8be2\uff0c\u800c\u4e0d\u662f\u7531\u670d\u52a1\u7aef\u4e00\u76f4 hold\uff0c\u76f4\u5230\u914d\u7f6e\u53d8\u66f4\u518d\u8fd4\u56de\uff0c\u4f46\u53ef\u80fd\u6709\u8bfb\u8005\u8fd8\u4f1a\u6709\u7591\u95ee\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u7531\u5ba2\u6237\u7aef\u63a7\u5236\u8d85\u65f6\uff0c\u670d\u52a1\u7aef\u53bb\u9664\u6389\u5b9a\u65f6\u5668\uff0c\u8fd9\u6837\u5ba2\u6237\u7aef\u8d85\u65f6\u540e\u91cd\u65b0\u53d1\u8d77\u4e0b\u4e00\u6b21\u957f\u8f6e\u8be2\uff0c\u8fd9\u6837\u7684\u8bbe\u8ba1\u4e0d\u662f\u66f4\u7b80\u5355\u5417\uff1f\u65e0\u8bba\u662f Nacos \u8fd8\u662f Apollo \u90fd\u6709\u8fd9\u6837\u7684\u5b9a\u65f6\u5668\uff0c\u800c\u4e0d\u662f\u9760\u5ba2\u6237\u7aef\u63a7\u5236\u8d85\u65f6\uff0c\u8fd9\u6837\u505a\u4e3b\u8981\u6709\u4e24\u70b9\u8003\u8651\uff1a<\/p>\n<ul>\n<li>\u548c\u771f\u6b63\u7684\u5ba2\u6237\u7aef\u8d85\u65f6\u533a\u5206\u5f00<\/li>\n<li>\u4ec5\u4ec5\u4f7f\u7528\u5f02\u5e38\uff08Exception\uff09\u6765\u8868\u8fbe\u5f02\u5e38\u6d41\uff0c\u800c\u4e0d\u5e94\u8be5\u7528\u5f02\u5e38\u6765\u8868\u8fbe\u6b63\u5e38\u7684\u4e1a\u52a1\u6d41\u3002304 \u4e0d\u662f\u8d85\u65f6\u5f02\u5e38\uff0c\u800c\u662f\u957f\u8f6e\u8be2\u4e2d\u914d\u7f6e\u672a\u53d8\u66f4\u7684\u4e00\u79cd\u6b63\u5e38\u6d41\u7a0b\uff0c\u4e0d\u5e94\u8be5\u4f7f\u7528\u8d85\u65f6\u5f02\u5e38\u6765\u8868\u8fbe<\/li>\n<\/ul>\n<p>\u5ba2\u6237\u7aef\u8d85\u65f6\u9700\u8981\u5355\u72ec\u914d\u7f6e\uff0c\u4e14\u9700\u8981\u6bd4\u670d\u52a1\u7aef\u957f\u8f6e\u8be2\u7684\u8d85\u65f6\u8981\u957f\u3002\u6b63\u5982\u4e0a\u8ff0\u7684 demo \u4e2d\u5ba2\u6237\u7aef\u8d85\u65f6\u8bbe\u7f6e\u7684\u662f 40s\uff0c\u670d\u52a1\u7aef\u5224\u65ad\u4e00\u6b21\u957f\u8f6e\u8be2\u8d85\u65f6\u662f 30s\u3002\u8fd9\u4e24\u4e2a\u503c\u5728 Nacos \u4e2d\u9ed8\u8ba4\u662f 30s \u548c 29.5s\uff0c\u5728 Apollo \u4e2d\u9ed8\u8ba4\u662f\u662f 90s \u548c 60s\u3002<\/p>\n<h3>\u957f\u8f6e\u8be2\u5305\u542b\u591a\u7ec4 dataId<\/h3>\n<p>\u5728\u4e0a\u8ff0\u7684 demo \u4e2d\uff0c\u4e00\u4e2a dataId \u4f1a\u53d1\u8d77\u4e00\u6b21\u957f\u8f6e\u8be2\uff0c\u5728\u5b9e\u9645\u914d\u7f6e\u4e2d\u5fc3\u7684\u8bbe\u8ba1\u4e2d\u80af\u5b9a\u4e0d\u80fd\u8fd9\u6837\u8bbe\u8ba1\uff0c\u4e00\u822c\u7684\u4f18\u5316\u65b9\u5f0f\u662f\uff0c\u4e00\u6279 dataId \u7ec4\u6210\u4e00\u4e2a\u7ec4\u6279\u91cf\u5305\u542b\u5728\u4e00\u4e2a\u957f\u8f6e\u8be2\u4efb\u52a1\u4e2d\u3002\u5728 Nacos \u4e2d\uff0c\u6309\u7167 3000 \u4e2a dataId \u4e3a\u4e00\u7ec4\u5305\u88c5\u6210\u4e00\u4e2a\u957f\u8f6e\u8be2\u4efb\u52a1\u3002<\/p>\n<h2>\u957f\u8f6e\u8be2\u548c\u957f\u8fde\u63a5<\/h2>\n<p>\u8bb2\u5b8c\u5b9e\u73b0\u7ec6\u8282\uff0c\u672c\u6587\u6700\u6838\u5fc3\u7684\u90e8\u5206\u5df2\u7ecf\u4ecb\u7ecd\u5b8c\u4e86\u3002\u518d\u56de\u5230\u6700\u524d\u9762\u63d0\u5230\u7684\u6570\u636e\u4ea4\u4e92\u6a21\u5f0f\u4e0a\u63d0\u5230\u7684\u63a8\u6a21\u578b\u548c\u62c9\u6a21\u578b\uff0c\u5176\u5b9e\u5728\u5199\u8fd9\u7bc7\u6587\u7ae0\u65f6\uff0c\u6211\u66fe\u7ecf\u95ee\u8fc7\u4ea4\u6d41\u7fa4\u4e2d\u7684\u5c0f\u4f19\u4f34\u4eec\u201c\u914d\u7f6e\u4e2d\u5fc3\u5b9e\u73b0\u52a8\u6001\u63a8\u9001\u7684\u539f\u7406\u201d\uff0c\u4ed6\u4eec\u4e2d\u7edd\u5927\u591a\u6570\u4eba\u8ba4\u4e3a\u662f\u957f\u8fde\u63a5\u7684\u63a8\u6a21\u578b\u3002\u7136\u800c\u4e8b\u5b9e\u4e0a\uff0c\u4e3b\u6d41\u7684\u914d\u7f6e\u4e2d\u5fc3\u51e0\u4e4e\u90fd\u662f\u4f7f\u7528\u4e86\u672c\u6587\u4ecb\u7ecd\u7684\u957f\u8f6e\u8be2\u65b9\u6848\uff0c\u8fd9\u53c8\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f<\/p>\n<p>\u6211\u4e5f\u7ffb\u9605\u4e86\u4e0d\u5c11\u535a\u5ba2\uff0c\u663e\u7136\u4ed6\u4eec\u7ed9\u51fa\u7684\u7406\u7531\u5e76\u4e0d\u80fd\u8bf4\u670d\u6211\uff0c\u6211\u5c1d\u8bd5\u7740\u4ece\u81ea\u5df1\u7684\u89d2\u5ea6\u5206\u6790\u4e86\u4e00\u4e0b\u8fd9\u4e2a\u65e2\u5b9a\u7684\u4e8b\u5b9e\uff1a<\/p>\n<ul>\n<li>\u957f\u8f6e\u8be2\u5b9e\u73b0\u8d77\u6765\u6bd4\u8f83\u5bb9\u6613\uff0c\u5b8c\u5168\u4f9d\u8d56\u4e8e HTTP \u4fbf\u53ef\u4ee5\u5b9e\u73b0\u5168\u90e8\u903b\u8f91\uff0c\u800c HTTP \u662f\u6700\u80fd\u591f\u88ab\u5927\u4f17\u63a5\u53d7\u7684\u901a\u4fe1\u65b9\u5f0f<\/li>\n<li>\u957f\u8f6e\u8be2\u4f7f\u7528 HTTP\uff0c\u4fbf\u4e8e\u591a\u8bed\u8a00\u5ba2\u6237\u7aef\u7684\u7f16\u5199\uff0c\u5927\u591a\u6570\u8bed\u8a00\u90fd\u6709 HTTP \u7684\u5ba2\u6237\u7aef<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u957f\u8fde\u63a5\u662f\u4e0d\u662f\u771f\u7684\u5c31\u4e0d\u9002\u5408\u7528\u4e8e\u914d\u7f6e\u4e2d\u5fc3\u573a\u666f\u5462\uff1f\u6709\u4eba\u53ef\u80fd\u4f1a\u8ba4\u4e3a\u7ef4\u62a4\u4e00\u6761\u957f\u8fde\u63a5\u4f1a\u6d88\u8017\u5927\u91cf\u8d44\u6e90\uff0c\u800c\u957f\u8f6e\u8be2\u53ef\u4ee5\u63d0\u5347\u7cfb\u7edf\u7684\u541e\u5410\u91cf\uff0c\u800c\u5728\u914d\u7f6e\u4e2d\u5fc3\u573a\u666f\uff0c\u8fd9\u4e00\u5047\u8bbe\u5e76\u6ca1\u6709\u5b9e\u9645\u7684\u538b\u6d4b\u6570\u636e\u80fd\u591f\u8bba\u8bc1\uff0cbenchmark everything\uff01please~<\/p>\n<p>\u53e6\u5916\uff0c\u7ffb\u9605\u4e86\u4e00\u4e0b Nacos 2.0 \u7684 milestone\uff0c\u6211\u53d1\u73b0\u4e86\u4e00\u4e2a\u6709\u610f\u601d\u7684\u89c4\u5212\uff0cNacos \u7684\u6ce8\u518c\u4e2d\u5fc3\uff08\u76ee\u524d\u662f\u77ed\u8f6e\u8be2 + udp \u63a8\u9001\uff09\u548c\u914d\u7f6e\u4e2d\u5fc3\uff08\u76ee\u524d\u662f\u957f\u8f6e\u8be2\uff09\u90fd\u6709\u8ba1\u5212\u6539\u9020\u4e3a\u957f\u8fde\u63a5\u6a21\u5f0f\u3002<\/p>\n<p>\u518d\u56de\u8fc7\u5934\u6765\u770b\uff0c\u957f\u8f6e\u8be2\u5b9e\u73b0\u5df2\u7ecf\u5c06\u914d\u7f6e\u4e2d\u5fc3\u8fd9\u4e2a\u7ec4\u4ef6\u652f\u6491\u7684\u8db3\u591f\u597d\u4e86\uff0c\u66ff\u6362\u6210\u957f\u8fde\u63a5\uff0c\u4e00\u5b9a\u9700\u8981\u627e\u5230\u5408\u9002\u7684\u7406\u7531\u624d\u884c\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u672c\u6587\u4ecb\u7ecd\u4e86\u957f\u8f6e\u8be2\u3001\u8f6e\u8be2\u3001\u957f\u8fde\u63a5\u8fd9\u51e0\u79cd\u6570\u636e\u4ea4\u4e92\u6a21\u578b\u7684\u5dee\u5f02\u6027\u3002<\/p>\n<p>\u5206\u6790\u4e86 Nacos \u548c Apollo \u7b49\u4e3b\u6d41\u914d\u7f6e\u4e2d\u5fc3\u5747\u662f\u901a\u8fc7\u957f\u8f6e\u8be2\u7684\u65b9\u5f0f\u5b9e\u73b0\u914d\u7f6e\u7684\u5b9e\u65f6\u63a8\u9001\u7684\u3002\u5b9e\u65f6\u611f\u77e5\u5efa\u7acb\u5728\u5ba2\u6237\u7aef\u62c9\u7684\u57fa\u7840\u4e0a\uff0c\u56e0\u4e3a\u672c\u8d28\u4e0a\u8fd8\u662f\u901a\u8fc7 HTTP \u8fdb\u884c\u7684\u6570\u636e\u4ea4\u4e92\uff0c\u4e4b\u6240\u4ee5\u6709\u201c\u63a8\u201d\u7684\u611f\u89c9\uff0c\u662f\u56e0\u4e3a\u670d\u52a1\u7aef hold \u4f4f\u4e86\u5ba2\u6237\u7aef\u7684\u54cd\u5e94\u4f53\uff0c\u5e76\u4e14\u5728\u914d\u7f6e\u53d8\u66f4\u540e\u4e3b\u52a8\u5199\u5165\u4e86\u8fd4\u56de response \u5bf9\u8c61\u518d\u8fdb\u884c\u8fd4\u56de\u3002<\/p>\n<p>\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684 demo\uff0c\u5b9e\u73b0\u4e86\u957f\u8f6e\u8be2\u914d\u7f6e\u5b9e\u65f6\u63a8\u9001\u7684\u8fc7\u7a0b\u6f14\u793a\uff0c\u672c\u6587\u7684 demo \u793a\u4f8b\u5b58\u653e\u5728\uff1a<a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/github.com\/lexburner\/longPolling-demo\">https:\/\/github.com\/lexburner\/longPolling-demo<\/a><\/p>\n<p>\u672c\u6587\u8f6c\u8f7d\u81f3\uff1a<a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/mp.weixin.qq.com\/s\/YjvL0sUTGHxR3GJFqrP8qg\">https:\/\/mp.weixin.qq.com\/s\/YjvL0sUTGHxR3GJFqrP8qg<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u4f20\u7edf\u7684\u9759\u6001\u914d\u7f6e\u65b9\u5f0f\u60f3\u8981\u4fee\u6539\u67d0\u4e2a\u914d\u7f6e\u65f6\uff0c\u5fc5\u987b\u91cd\u65b0\u542f\u52a8\u4e00\u6b21\u5e94\u7528\uff0c\u5982\u679c\u662f\u6570\u636e\u5e93\u8fde\u63a5\u4e32\u7684\u53d8\u66f4\uff0c\u90a3\u53ef\u80fd\u8fd8\u5bb9\u6613\u63a5\u53d7\u4e00 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[97],"tags":[503],"class_list":["post-1990","post","type-post","status-publish","format-standard","hentry","category-tools-skills","tag-503"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1990","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1990"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1990\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}