{"id":128623,"date":"2024-03-25T07:10:54","date_gmt":"2024-03-24T22:10:54","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e3%83%9e%e3%83%ab%e3%83%81%e3%82%b9%e3%83%ac%e3%83%83%e3%83%89%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%80%812%e3%81%a4%e3%81%ae%e5%a4%a7%e3%81%8d%e3%81%aa%e3%83%86%e3%83%bc\/"},"modified":"2024-04-04T04:44:57","modified_gmt":"2024-04-03T19:44:57","slug":"java%e3%81%ae%e3%83%9e%e3%83%ab%e3%83%81%e3%82%b9%e3%83%ac%e3%83%83%e3%83%89%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%80%812%e3%81%a4%e3%81%ae%e5%a4%a7%e3%81%8d%e3%81%aa%e3%83%86%e3%83%bc","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e3%83%9e%e3%83%ab%e3%83%81%e3%82%b9%e3%83%ac%e3%83%83%e3%83%89%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%80%812%e3%81%a4%e3%81%ae%e5%a4%a7%e3%81%8d%e3%81%aa%e3%83%86%e3%83%bc\/","title":{"rendered":"Java\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30012\u3064\u306e\u5927\u304d\u306a\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u5927\u898f\u6a21\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u624b\u9806\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ol>\n<li>\uff12\u3064\u306e\u8868\u3092\u30e1\u30e2\u30ea\u306b\u30ed\u30fc\u30c9\u3057\u3066\u304a\u306e\u304a\u306e\u591a\u304f\u306a\u308b\u30d6\u30ed\u30c3\u30af\u306b\u5206\u5272\u3057\u3001\u5404\u30b9\u30ec\u30c3\u30c9\u3067\u30c7\u30fc\u30bf\u306e\u4e00\u90e8\u3092\u51e6\u7406\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002Java \u306e\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u8fbc\u307f\u304a\u3088\u3073\u5206\u5272\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>Java\u306eExecutor\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u7528\u3044\u3066\u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u3092\u69cb\u7bc9\u3057\u3001\u30b9\u30ec\u30c3\u30c9\u306e\u7ba1\u7406\u3092\u884c\u3046\u3002<\/li>\n<li>\u30c7\u30fc\u30bf\u3092\u5c0f\u3055\u306a\u30c1\u30e3\u30f3\u30af\u306b\u5206\u5272\u3057\u3001\u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u5185\u306e\u30b9\u30ec\u30c3\u30c9\u306b\u5272\u308a\u5f53\u3066\u3066\u51e6\u7406\u3055\u305b\u307e\u3059\u3002Java\u306eCallable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u7528\u3057\u3066\u5404\u30b9\u30ec\u30c3\u30c9\u306e\u30bf\u30b9\u30af\u3092\u5b9a\u7fa9\u3057\u3001Java\u306eFuture\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30ec\u30c3\u30c9\u306e\u623b\u308a\u5024\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>\u5404\u30b9\u30ec\u30c3\u30c9\u306e\u4e2d\u3067\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u7d50\u5408\u3059\u308b\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002Java \u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3092\u5229\u7528\u3057\u3066\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3057\u3001\u30eb\u30fc\u30d7\u51e6\u7406\u306b\u3088\u308a\u30c7\u30fc\u30bf\u3092\u8d70\u67fb\u304a\u3088\u3073\u7d50\u5408\u3057\u307e\u3059\u3002<\/li>\n<li>\u63a5\u7d9a\u3057\u305f\u30c7\u30fc\u30bf\u3092\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u306b\u683c\u7d0d\u3059\u308b\u304b\u3001\u30d5\u30a1\u30a4\u30eb\u306b\u51fa\u529b\u3057\u307e\u3059\u3002<\/li>\n<li>\u3059\u3079\u3066\u306e\u30b9\u30ec\u30c3\u30c9\u306e\u5b9f\u884c\u304c\u5b8c\u4e86\u3059\u308b\u306e\u3092\u5f85\u3061\u3001\u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u3092\u7d42\u4e86\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306f\u3001Java\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u5de8\u5927\u306a\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u3001\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.ArrayList;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.List;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.concurrent.*;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">TableJoiner<\/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\">THREAD_POOL_SIZE<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">10<\/span>;\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\">\/\/ \u52a0\u8f7d\u8868\u6570\u636e\u5230\u5185\u5b58\u4e2d<\/span>\r\nList&lt;Record&gt; table1 = loadTable1();\r\nList&lt;Record&gt; table2 = loadTable2();\r\n<span class=\"hljs-comment\">\/\/ \u5c06\u8868\u6570\u636e\u5206\u5272\u6210\u5c0f\u5757<\/span>\r\nList&lt;List&lt;Record&gt;&gt; chunks1 = splitIntoChunks(table1, THREAD_POOL_SIZE);\r\nList&lt;List&lt;Record&gt;&gt; chunks2 = splitIntoChunks(table2, THREAD_POOL_SIZE);\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u7ebf\u7a0b\u6c60<\/span>\r\n<span class=\"hljs-type\">ExecutorService<\/span> <span class=\"hljs-variable\">executor<\/span> <span class=\"hljs-operator\">=<\/span> Executors.newFixedThreadPool(THREAD_POOL_SIZE);\r\n<span class=\"hljs-comment\">\/\/ \u63d0\u4ea4\u4efb\u52a1\u7ed9\u7ebf\u7a0b\u6c60\u5904\u7406<\/span>\r\nList&lt;Future&lt;List&lt;Record&gt;&gt;&gt; results = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\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; THREAD_POOL_SIZE; i++) {\r\nList&lt;Record&gt; chunk1 = chunks1.get(i);\r\nList&lt;Record&gt; chunk2 = chunks2.get(i);\r\nCallable&lt;List&lt;Record&gt;&gt; task = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JoinTask<\/span>(chunk1, chunk2);\r\nFuture&lt;List&lt;Record&gt;&gt; result = executor.submit(task);\r\nresults.add(result);\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u6240\u6709\u7ebf\u7a0b\u6267\u884c\u5b8c\u6210<\/span>\r\nexecutor.shutdown();\r\n<span class=\"hljs-keyword\">try<\/span> {\r\nexecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);\r\n} <span class=\"hljs-keyword\">catch<\/span> (InterruptedException e) {\r\ne.printStackTrace();\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u7ebf\u7a0b\u7684\u8fd4\u56de\u7ed3\u679c\u5e76\u8fdb\u884c\u5408\u5e76<\/span>\r\nList&lt;Record&gt; output = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n<span class=\"hljs-keyword\">for<\/span> (Future&lt;List&lt;Record&gt;&gt; result : results) {\r\n<span class=\"hljs-keyword\">try<\/span> {\r\noutput.addAll(result.get());\r\n} <span class=\"hljs-keyword\">catch<\/span> (InterruptedException | ExecutionException e) {\r\ne.printStackTrace();\r\n}\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5c06\u8fde\u63a5\u540e\u7684\u6570\u636e\u8f93\u51fa<\/span>\r\n<span class=\"hljs-keyword\">for<\/span> (Record record : output) {\r\nSystem.out.println(record);\r\n}\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u52a0\u8f7d\u88681\u7684\u6570\u636e<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> List&lt;Record&gt; <span class=\"hljs-title function_\">loadTable1<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-comment\">\/\/ <span class=\"hljs-doctag\">TODO:<\/span> \u5b9e\u73b0\u88681\u6570\u636e\u52a0\u8f7d\u903b\u8f91<\/span>\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u52a0\u8f7d\u88682\u7684\u6570\u636e<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> List&lt;Record&gt; <span class=\"hljs-title function_\">loadTable2<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-comment\">\/\/ <span class=\"hljs-doctag\">TODO:<\/span> \u5b9e\u73b0\u88682\u6570\u636e\u52a0\u8f7d\u903b\u8f91<\/span>\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5c06\u8868\u6570\u636e\u5206\u5272\u6210\u5c0f\u5757<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> &lt;T&gt; List&lt;List&lt;T&gt;&gt; <span class=\"hljs-title function_\">splitIntoChunks<\/span><span class=\"hljs-params\">(List&lt;T&gt; table, <span class=\"hljs-type\">int<\/span> chunkSize)<\/span> {\r\nList&lt;List&lt;T&gt;&gt; chunks = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\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; table.size(); i += chunkSize) {\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">end<\/span> <span class=\"hljs-operator\">=<\/span> Math.min(i + chunkSize, table.size());\r\nList&lt;T&gt; chunk = table.subList(i, end);\r\nchunks.add(chunk);\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> chunks;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u8868\u8fde\u63a5\u4efb\u52a1<\/span>\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">JoinTask<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">Callable<\/span>&lt;List&lt;Record&gt;&gt; {\r\n<span class=\"hljs-keyword\">private<\/span> List&lt;Record&gt; table1;\r\n<span class=\"hljs-keyword\">private<\/span> List&lt;Record&gt; table2;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">JoinTask<\/span><span class=\"hljs-params\">(List&lt;Record&gt; table1, List&lt;Record&gt; table2)<\/span> {\r\n<span class=\"hljs-built_in\">this<\/span>.table1 = table1;\r\n<span class=\"hljs-built_in\">this<\/span>.table2 = table2;\r\n}\r\n<span class=\"hljs-meta\">@Override<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> List&lt;Record&gt; <span class=\"hljs-title function_\">call<\/span><span class=\"hljs-params\">()<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\nList&lt;Record&gt; result = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ArrayList<\/span>&lt;&gt;();\r\n<span class=\"hljs-comment\">\/\/ \u8868\u8fde\u63a5\u64cd\u4f5c<\/span>\r\n<span class=\"hljs-keyword\">for<\/span> (Record record1 : table1) {\r\n<span class=\"hljs-keyword\">for<\/span> (Record record2 : table2) {\r\n<span class=\"hljs-keyword\">if<\/span> (record1.getId() == record2.getId()) {\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u5927\u898f\u6a21\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u624b\u9806\u306b\u5f93\u3063\u3066\u304f\u3060\u3055\u3044\u3002 \uff12\u3064\u306e\u8868\u3092\u30e1\u30e2\u30ea\u306b\u30ed\u30fc\u30c9\u3057\u3066\u304a\u306e\u304a\u306e\u591a\u304f\u306a\u308b\u30d6\u30ed\u30c3\u30af\u306b\u5206\u5272\u3057\u3001\u5404\u30b9\u30ec\u30c3\u30c9\u3067\u30c7\u30fc\u30bf\u306e\u4e00\u90e8\u3092\u51e6\u7406\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002Java  [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-128623","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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