{"id":115264,"date":"2024-03-23T02:00:55","date_gmt":"2024-03-22T17:00:55","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%a7%e3%83%ac%e3%83%bc%e3%83%88%e3%83%aa%e3%83%9f%e3%83%83%e3%83%88%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86\/"},"modified":"2024-04-05T04:13:30","modified_gmt":"2024-04-04T19:13:30","slug":"java%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%a7%e3%83%ac%e3%83%bc%e3%83%88%e3%83%aa%e3%83%9f%e3%83%83%e3%83%88%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%a7%e3%83%ac%e3%83%bc%e3%83%88%e3%83%aa%e3%83%9f%e3%83%83%e3%83%88%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86\/","title":{"rendered":"Java\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u30ec\u30fc\u30c8\u30ea\u30df\u30c3\u30c8\u3092\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u304b"},"content":{"rendered":"<p>Java\u3067\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5236\u9650\u3092\u884c\u3046\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u30ab\u30a6\u30f3\u30c8\u6a5f\u80fd: \u5404\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3078\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u30ab\u30a6\u30f3\u30bf\u30fc\u3092\u7dad\u6301\u3057\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u6570\u304c\u6240\u5b9a\u306e\u95be\u5024\u3092\u8d85\u3048\u305f\u5834\u5408\u306f\u4ee5\u964d\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u62d2\u5426\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001ConcurrentHashMap \u306a\u3069\u306e\u4e26\u884c\u30b3\u30f3\u30c6\u30ca\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30b3\u30f3\u30c6\u30ca\u3067\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u30ad\u30fc\u3068\u306a\u308a\u3001\u30ab\u30a6\u30f3\u30bf\u30fc\u304c\u5024\u3068\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.concurrent.ConcurrentHashMap;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">RateLimiter<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> ConcurrentHashMap&lt;String, Integer&gt; counters = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ConcurrentHashMap<\/span>&lt;&gt;();\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">MAX_REQUESTS<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">100<\/span>; <span class=\"hljs-comment\">\/\/ \u8bbe\u5b9a\u7684\u9608\u503c<\/span>\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">allowRequest<\/span><span class=\"hljs-params\">(String interfaceName)<\/span> {\r\n        counters.putIfAbsent(interfaceName, <span class=\"hljs-number\">0<\/span>);\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">count<\/span> <span class=\"hljs-operator\">=<\/span> counters.get(interfaceName);\r\n        <span class=\"hljs-keyword\">if<\/span> (count &gt;= MAX_REQUESTS) {\r\n            <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">false<\/span>;\r\n        }\r\n        counters.put(interfaceName, count + <span class=\"hljs-number\">1<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n    }\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-type\">String<\/span> <span class=\"hljs-variable\">interfaceName<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"interface1\"<\/span>;\r\n        <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">i<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">110<\/span>; i++) {\r\n            <span class=\"hljs-keyword\">if<\/span> (allowRequest(interfaceName)) {\r\n                System.out.println(<span class=\"hljs-string\">\"Allow request for interface: \"<\/span> + interfaceName);\r\n            } <span class=\"hljs-keyword\">else<\/span> {\r\n                System.out.println(<span class=\"hljs-string\">\"Reject request for interface: \"<\/span> + interfaceName);\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u4e00\u5b9a\u6642\u9593\u306e\u7bc4\u56f2\u5185\u306b\u304a\u3051\u308b\u30ea\u30af\u30a8\u30b9\u30c8\u91cf\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u3001\u56fa\u5b9a\u9577\u306e\u6642\u9593\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30ea\u30af\u30a8\u30b9\u30c8\u91cf\u304c\u898f\u5b9a\u3055\u308c\u305f\u95be\u5024\u3092\u8d85\u3048\u308b\u3068\u3001\u5f8c\u7d9a\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u62d2\u5426\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u306f\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306e\u30ad\u30e5\u30fc\u307e\u305f\u306f\u914d\u5217\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a6\u30a3\u30f3\u30c9\u30a6\u5185\u3067\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u6570\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u3067\u3001\u5236\u9650\u3092\u8a2d\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.ArrayDeque;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Queue;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">RateLimiter<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> Queue&lt;Long&gt; timestamps = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayDeque<\/span>&lt;&gt;();\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">WINDOW_SIZE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1000<\/span>; <span class=\"hljs-comment\">\/\/ \u7a97\u53e3\u5927\u5c0f\uff0c\u5355\u4f4d\u4e3a\u6beb\u79d2<\/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\">int<\/span> <span class=\"hljs-variable\">MAX_REQUESTS<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">100<\/span>; <span class=\"hljs-comment\">\/\/ \u8bbe\u5b9a\u7684\u9608\u503c<\/span>\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">allowRequest<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-type\">long<\/span> <span class=\"hljs-variable\">now<\/span> <span class=\"hljs-operator\">=<\/span> System.currentTimeMillis();\r\n        timestamps.offer(now);\r\n        <span class=\"hljs-keyword\">while<\/span> (!timestamps.isEmpty() &amp;&amp; now - timestamps.peek() &gt; WINDOW_SIZE) {\r\n            timestamps.poll();\r\n        }\r\n        <span class=\"hljs-keyword\">return<\/span> timestamps.size() &lt;= MAX_REQUESTS;\r\n    }\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-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">i<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">110<\/span>; i++) {\r\n            <span class=\"hljs-keyword\">if<\/span> (allowRequest()) {\r\n                System.out.println(<span class=\"hljs-string\">\"Allow request\"<\/span>);\r\n            } <span class=\"hljs-keyword\">else<\/span> {\r\n                System.out.println(<span class=\"hljs-string\">\"Reject request\"<\/span>);\r\n            }\r\n            <span class=\"hljs-keyword\">try<\/span> {\r\n                Thread.sleep(<span class=\"hljs-number\">100<\/span>);\r\n            } <span class=\"hljs-keyword\">catch<\/span> (InterruptedException e) {\r\n                e.printStackTrace();\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u30c8\u30fc\u30af\u30f3\u30d0\u30b1\u30c3\u30c8\uff1a\u4e00\u5b9a\u306e\u901f\u5ea6\u3067\u30c8\u30fc\u30af\u30f3\u3092\u751f\u6210\u3057\u3001\u5404\u30ea\u30af\u30a8\u30b9\u30c8\u306f\u901a\u904e\u3059\u308b\u305f\u3081\u306b\u30c8\u30fc\u30af\u30f3\u3092\u53d6\u5f97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u30c8\u30fc\u30af\u30f3\u6570\u304c\u4e0d\u8db3\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u5f8c\u7d9a\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u62d2\u5426\u3059\u308b\u3002ScheduledExecutorService\u3092\u4f7f\u7528\u3057\u3066\u30c8\u30fc\u30af\u30f3\u306e\u5b9a\u6642\u751f\u6210\u3092\u884c\u3044\u3001Semaphore\u3092\u4f7f\u7528\u3057\u3066\u30c8\u30fc\u30af\u30f3\u306e\u53d6\u5f97\u3092\u5236\u5fa1\u3067\u304d\u308b\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.concurrent.Semaphore;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.concurrent.ScheduledThreadPoolExecutor;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.concurrent.TimeUnit;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">RateLimiter<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">Semaphore<\/span> <span class=\"hljs-variable\">tokens<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Semaphore<\/span>(<span class=\"hljs-number\">10<\/span>); <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u4ee4\u724c\u6570\u91cf<\/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\">int<\/span> <span class=\"hljs-variable\">RATE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1<\/span>; <span class=\"hljs-comment\">\/\/ \u4ea7\u751f\u4ee4\u724c\u7684\u901f\u7387\uff0c\u5355\u4f4d\u4e3a\u4e2a\/\u79d2<\/span>\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">allowRequest<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> tokens.tryAcquire();\r\n    }\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-type\">ScheduledThreadPoolExecutor<\/span> <span class=\"hljs-variable\">executor<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ScheduledThreadPoolExecutor<\/span>(<span class=\"hljs-number\">1<\/span>);\r\n        executor.scheduleAtFixedRate(() -&gt; {\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">availableTokens<\/span> <span class=\"hljs-operator\">=<\/span> tokens.availablePermits();\r\n            <span class=\"hljs-keyword\">if<\/span> (availableTokens &lt; RATE) {\r\n                tokens.release(RATE - availableTokens);\r\n            }\r\n        }, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">1<\/span>, TimeUnit.SECONDS);\r\n\r\n        <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">i<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">20<\/span>; i++) {\r\n            <span class=\"hljs-keyword\">if<\/span> (allowRequest()) {\r\n                System.out.println(<span class=\"hljs-string\">\"Allow request\"<\/span>);\r\n            } <span class=\"hljs-keyword\">else<\/span> {\r\n                System.out.println(<span class=\"hljs-string\">\"Reject request\"<\/span>);\r\n            }\r\n            <span class=\"hljs-keyword\">try<\/span> {\r\n                Thread.sleep(<span class=\"hljs-number\">100<\/span>);\r\n            } <span class=\"hljs-keyword\">catch<\/span> (InterruptedException e) {\r\n                e.printStackTrace();\r\n            }\r\n        }\r\n\r\n        executor.shutdown();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e00\u822c\u7684\u306aJava\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u9650\u6d41\u5b9f\u88c5\u65b9\u6cd5\u3092\u3044\u304f\u3064\u304b\u691c\u8a0e\u3057\u3001\u5b9f\u969b\u306e\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u65b9\u6cd5\u3092\u9078\u629e\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5236\u9650\u3092\u884c\u3046\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 \u30ab\u30a6\u30f3\u30c8\u6a5f\u80fd: \u5404\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3078\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u30ab\u30a6\u30f3\u30bf\u30fc\u3092\u7dad\u6301\u3057\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u6570\u304c\u6240\u5b9a\u306e\u95be\u5024\u3092\u8d85\u3048\u305f\u5834\u5408\u306f\u4ee5\u964d\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u62d2\u5426\u3057\u307e\u3059\u3002\u3053\u308c\u306f [&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-115264","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\/ 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