{"id":19345,"date":"2024-03-15T18:44:00","date_gmt":"2024-03-15T18:44:00","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/"},"modified":"2024-03-21T15:28:47","modified_gmt":"2024-03-21T15:28:47","slug":"how-to-set-the-maximum-number-of-connections-in-netty","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/","title":{"rendered":"How to set the maximum number of connections in Netty?"},"content":{"rendered":"<p>In Netty, the maximum number of connections can be set using the following method:<\/p>\n<ol>\n<li>Set the SO_BACKLOG parameter in ServerBootstrap using the option() method, which represents the maximum length of the queue for connections waiting to be accepted. An example code snippet is as follows:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">ServerBootstrap<\/span> <span class=\"hljs-variable\">serverBootstrap<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ServerBootstrap<\/span>();\r\nserverBootstrap.group(bossGroup, workerGroup)\r\n               .channel(NioServerSocketChannel.class)\r\n               .option(ChannelOption.SO_BACKLOG, <span class=\"hljs-number\">100<\/span>) <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u6700\u5927\u8fde\u63a5\u6570\u4e3a100<\/span>\r\n               .childHandler(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyChannelInitializer<\/span>());\r\n<\/code><\/pre>\n<ol>\n<li>In the initChannel() method of ChannelInitializer, add a ChannelInboundHandlerAdapter to the ChannelPipeline to monitor connection numbers and handle them. Example code is as follows:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyChannelInitializer<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">ChannelInitializer<\/span>&lt;SocketChannel&gt; {\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">protected<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">initChannel<\/span><span class=\"hljs-params\">(SocketChannel ch)<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\n        <span class=\"hljs-type\">ChannelPipeline<\/span> <span class=\"hljs-variable\">pipeline<\/span> <span class=\"hljs-operator\">=<\/span> ch.pipeline();\r\n        pipeline.addLast(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ConnectionCountHandler<\/span>()); <span class=\"hljs-comment\">\/\/ \u6dfb\u52a0\u8fde\u63a5\u6570\u76d1\u542c\u5904\u7406\u5668<\/span>\r\n        pipeline.addLast(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyHandler1<\/span>());\r\n        pipeline.addLast(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyHandler2<\/span>());\r\n    }\r\n}\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ConnectionCountHandler<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">ChannelInboundHandlerAdapter<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">AtomicInteger<\/span> <span class=\"hljs-variable\">connectionCount<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">AtomicInteger<\/span>();\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">channelActive<\/span><span class=\"hljs-params\">(ChannelHandlerContext ctx)<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">currentCount<\/span> <span class=\"hljs-operator\">=<\/span> connectionCount.incrementAndGet();\r\n        <span class=\"hljs-keyword\">if<\/span> (currentCount &gt; <span class=\"hljs-number\">100<\/span>) {\r\n            ctx.channel().close(); <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u8fde\u63a5<\/span>\r\n        }\r\n        <span class=\"hljs-built_in\">super<\/span>.channelActive(ctx);\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">channelInactive<\/span><span class=\"hljs-params\">(ChannelHandlerContext ctx)<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\n        connectionCount.decrementAndGet();\r\n        <span class=\"hljs-built_in\">super<\/span>.channelInactive(ctx);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>By using the above method, you can set a maximum number of connections, monitor the number of connections, and close new connections when the maximum number is reached.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Netty, the maximum number of connections can be set using the following method: Set the SO_BACKLOG parameter in ServerBootstrap using the option() method, which represents the maximum length of the queue for connections waiting to be accepted. An example code snippet is as follows: ServerBootstrap serverBootstrap = new ServerBootstrap(); serverBootstrap.group(bossGroup, workerGroup) .channel(NioServerSocketChannel.class) .option(ChannelOption.SO_BACKLOG, 100) [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-19345","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to set the maximum number of connections in Netty? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to set the maximum number of connections in Netty?\" \/>\n<meta property=\"og:description\" content=\"In Netty, the maximum number of connections can be set using the following method: Set the SO_BACKLOG parameter in ServerBootstrap using the option() method, which represents the maximum length of the queue for connections waiting to be accepted. An example code snippet is as follows: ServerBootstrap serverBootstrap = new ServerBootstrap(); serverBootstrap.group(bossGroup, workerGroup) .channel(NioServerSocketChannel.class) .option(ChannelOption.SO_BACKLOG, 100) [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T18:44:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T15:28:47+00:00\" \/>\n<meta name=\"author\" content=\"William Carter\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"William Carter\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/\"},\"author\":{\"name\":\"William Carter\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/f697031891aacefc4b681d139781d3c0\"},\"headline\":\"How to set the maximum number of connections in Netty?\",\"datePublished\":\"2024-03-15T18:44:00+00:00\",\"dateModified\":\"2024-03-21T15:28:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/\"},\"wordCount\":108,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-set-the-maximum-number-of-connections-in-netty\/\",\"name\":\"How to set the maximum number of connections in Netty? 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