{"id":107095,"date":"2024-03-22T12:10:57","date_gmt":"2024-03-22T03:10:57","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/kafka%e3%81%ae%e3%83%87%e3%82%a3%e3%83%ac%e3%82%a4%e3%82%ad%e3%83%a5%e3%83%bc%e3%81%ae%e4%bb%95%e7%b5%84%e3%81%bf%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/"},"modified":"2024-04-05T02:47:02","modified_gmt":"2024-04-04T17:47:02","slug":"kafka%e3%81%ae%e3%83%87%e3%82%a3%e3%83%ac%e3%82%a4%e3%82%ad%e3%83%a5%e3%83%bc%e3%81%ae%e4%bb%95%e7%b5%84%e3%81%bf%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/kafka%e3%81%ae%e3%83%87%e3%82%a3%e3%83%ac%e3%82%a4%e3%82%ad%e3%83%a5%e3%83%bc%e3%81%ae%e4%bb%95%e7%b5%84%e3%81%bf%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/","title":{"rendered":"Kafka\u306e\u30c7\u30a3\u30ec\u30a4\u30ad\u30e5\u30fc\u306e\u4ed5\u7d44\u307f\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002"},"content":{"rendered":"<p>Kafka\u306b\u306f\u9045\u5ef6\u30ad\u30e5\u30fc\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u306f\u6a19\u6e96\u3067\u306f\u542b\u307e\u308c\u307e\u305b\u3093\u304c\u3001\u7279\u5b9a\u306e\u624b\u6cd5\u3067\u9045\u5ef6\u30ad\u30e5\u30fc\u306e\u6a5f\u80fd\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001Kafka\u30d9\u30fc\u30b9\u306e\u9045\u5ef6\u30ad\u30e5\u30fc\u5b9f\u88c5\u624b\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>delayed-messages\u3068ready-messages\u3068\u3044\u30462\u3064\u306e\u8ad6\u7406\u30c8\u30d4\u30c3\u30af\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002delayed-messages\u306f\u9045\u5ef6\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u683c\u7d0d\u3057\u3001ready-messages\u306f\u671f\u9650\u304c\u5207\u308c\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002<\/li>\n<li>\u30d7\u30ed\u30c7\u30e5\u30fc\u30b5\u30fc\u306fdelayed-messages\u30c8\u30d4\u30c3\u30af\u306b\u9045\u5ef6\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3057\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u6709\u52b9\u671f\u9650\u3092\u4ed8\u3051\u307e\u3059\u3002<\/li>\n<li>\u9045\u5ef6\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306b\u3001\u9045\u5ef6\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30c8\u30d4\u30c3\u30af\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u3067\u8aad\u307f\u53d6\u308a\u307e\u3059\u3002 \u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u306f\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u671f\u9650\u304c\u5207\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001\u671f\u9650\u304c\u5207\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u305d\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092 ready \u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30c8\u30d4\u30c3\u30af\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<li>\u5225\u306e\u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u3092\u8d77\u52d5\u3057\u3066ready-messages\u30c8\u30d4\u30c3\u30af\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6d88\u8cbb\u3057\u3001\u5bfe\u5fdc\u3059\u308b\u51e6\u7406\u3092\u884c\u3046<\/li>\n<\/ol>\n<p>Java\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u305fKafka\u306e\u7c21\u5358\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.kafka.clients.consumer.*;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.kafka.clients.producer.*;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.kafka.common.serialization.*;\r\n\r\n<span class=\"hljs-keyword\">import<\/span> java.time.Duration;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Collections;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Properties;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">DelayedQueueExample<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">BOOTSTRAP_SERVERS<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"localhost:9092\"<\/span>;\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">DELAYED_TOPIC<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"delayed-messages\"<\/span>;\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">READY_TOPIC<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"ready-messages\"<\/span>;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u5ef6\u8fdf\u961f\u5217\u6d88\u8d39\u8005<\/span>\r\n        KafkaConsumer&lt;String, String&gt; delayedConsumer = createConsumer();\r\n        delayedConsumer.subscribe(Collections.singleton(DELAYED_TOPIC));\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u5c31\u7eea\u961f\u5217\u6d88\u8d39\u8005<\/span>\r\n        KafkaConsumer&lt;String, String&gt; readyConsumer = createConsumer();\r\n        readyConsumer.subscribe(Collections.singleton(READY_TOPIC));\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u542f\u52a8\u5ef6\u8fdf\u961f\u5217\u6d88\u8d39\u8005\u7ebf\u7a0b<\/span>\r\n        <span class=\"hljs-type\">Thread<\/span> <span class=\"hljs-variable\">delayedConsumerThread<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Thread<\/span>(() -&gt; {\r\n            <span class=\"hljs-keyword\">while<\/span> (<span class=\"hljs-literal\">true<\/span>) {\r\n                ConsumerRecords&lt;String, String&gt; records = delayedConsumer.poll(Duration.ofMillis(<span class=\"hljs-number\">100<\/span>));\r\n                <span class=\"hljs-keyword\">for<\/span> (ConsumerRecord&lt;String, String&gt; record : records) {\r\n                    <span class=\"hljs-type\">long<\/span> <span class=\"hljs-variable\">expirationTime<\/span> <span class=\"hljs-operator\">=<\/span> Long.parseLong(record.value());\r\n                    <span class=\"hljs-type\">long<\/span> <span class=\"hljs-variable\">currentTime<\/span> <span class=\"hljs-operator\">=<\/span> System.currentTimeMillis();\r\n                    <span class=\"hljs-keyword\">if<\/span> (currentTime &gt;= expirationTime) {\r\n                        <span class=\"hljs-comment\">\/\/ \u5c06\u6d88\u606f\u53d1\u9001\u5230\u5c31\u7eea\u961f\u5217<\/span>\r\n                        sendToReadyQueue(record.key(), Long.toString(expirationTime));\r\n                    }\r\n                }\r\n            }\r\n        });\r\n        delayedConsumerThread.start();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u5904\u7406\u5c31\u7eea\u961f\u5217\u6d88\u606f<\/span>\r\n        <span class=\"hljs-keyword\">while<\/span> (<span class=\"hljs-literal\">true<\/span>) {\r\n            ConsumerRecords&lt;String, String&gt; records = readyConsumer.poll(Duration.ofMillis(<span class=\"hljs-number\">100<\/span>));\r\n            <span class=\"hljs-keyword\">for<\/span> (ConsumerRecord&lt;String, String&gt; record : records) {\r\n                <span class=\"hljs-comment\">\/\/ \u5904\u7406\u6d88\u606f<\/span>\r\n                System.out.println(<span class=\"hljs-string\">\"Received message: \"<\/span> + record.value());\r\n            }\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> KafkaConsumer&lt;String, String&gt; <span class=\"hljs-title function_\">createConsumer<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-type\">Properties<\/span> <span class=\"hljs-variable\">props<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Properties<\/span>();\r\n        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);\r\n        props.put(ConsumerConfig.GROUP_ID_CONFIG, <span class=\"hljs-string\">\"delayed-queue-consumer\"<\/span>);\r\n        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());\r\n        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">KafkaConsumer<\/span>&lt;&gt;(props);\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">sendToReadyQueue<\/span><span class=\"hljs-params\">(String key, String value)<\/span> {\r\n        <span class=\"hljs-keyword\">try<\/span> (Producer&lt;String, String&gt; producer = createProducer()) {\r\n            producer.send(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ProducerRecord<\/span>&lt;&gt;(READY_TOPIC, key, value));\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> Producer&lt;String, String&gt; <span class=\"hljs-title function_\">createProducer<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-type\">Properties<\/span> <span class=\"hljs-variable\">props<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Properties<\/span>();\r\n        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);\r\n        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());\r\n        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">KafkaProducer<\/span>&lt;&gt;(props);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u305f\u3060\u3057\u3001\u6d88\u8cbb\u8005\u306b\u3088\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30d7\u30eb\u306f\u4e00\u5b9a\u9593\u9694\u3067\u884c\u308f\u308c\u308b\u305f\u3081\u3001\u3053\u306e\u65b9\u5f0f\u3067\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u6709\u52b9\u671f\u9593\u306e\u6b63\u78ba\u6027\u306f\u4fdd\u8a3c\u3067\u304d\u307e\u305b\u3093\u3002\u3088\u308a\u6b63\u78ba\u306a\u9045\u5ef6\u30ad\u30e5\u30fc\u306e\u5b9f\u88c5\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001RabbitMQ\u3001ActiveMQ \u306a\u3069\u306e\u5c02\u7528\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u30ad\u30e5\u30fc\u30df\u30c9\u30eb\u30a6\u30a7\u30a2\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306b\u306f\u3001\u3088\u308a\u4fbf\u5229\u306a\u9045\u5ef6\u30e1\u30c3\u30bb\u30fc\u30b8\u6a5f\u80fd\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kafka\u306b\u306f\u9045\u5ef6\u30ad\u30e5\u30fc\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u306f\u6a19\u6e96\u3067\u306f\u542b\u307e\u308c\u307e\u305b\u3093\u304c\u3001\u7279\u5b9a\u306e\u624b\u6cd5\u3067\u9045\u5ef6\u30ad\u30e5\u30fc\u306e\u6a5f\u80fd\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001Kafka\u30d9\u30fc\u30b9\u306e\u9045\u5ef6\u30ad\u30e5\u30fc\u5b9f\u88c5\u624b\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002 delayed-messages\u3068ready- [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-107095","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>Kafka\u306e\u30c7\u30a3\u30ec\u30a4\u30ad\u30e5\u30fc\u306e\u4ed5\u7d44\u307f\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002 - 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\/ja\/blog\/kafka\u306e\u30c7\u30a3\u30ec\u30a4\u30ad\u30e5\u30fc\u306e\u4ed5\u7d44\u307f\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002\/\" \/>\n<meta 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