{"id":2300,"date":"2017-11-02T11:29:49","date_gmt":"2017-11-02T03:29:49","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=2300"},"modified":"2017-11-02T11:29:49","modified_gmt":"2017-11-02T03:29:49","slug":"java%e5%ae%9e%e7%8e%b0%e5%88%86%e5%b8%83%e5%bc%8f%e4%b8%8btwitter%e5%85%a8%e5%b1%80%e5%94%af%e4%b8%80id%e7%94%9f%e6%88%90%e5%99%a8snowflake64%e4%bd%8d%e8%87%aa%e5%a2%9eid%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=2300","title":{"rendered":"java\u5b9e\u73b0\u5206\u5e03\u5f0f\u4e0bTwitter\u5168\u5c40\u552f\u4e00ID\u751f\u6210\u5668Snowflake(64\u4f4d\u81ea\u589eID\u7b97\u6cd5)"},"content":{"rendered":"<p>\n\tTwitter-Snowflake\u7b97\u6cd5\u4ea7\u751f\u7684\u80cc\u666f\u76f8\u5f53\u7b80\u5355\uff0c\u4e3a\u4e86\u6ee1\u8db3Twitter\u6bcf\u79d2\u4e0a\u4e07\u6761\u6d88\u606f\u7684\u8bf7\u6c42\uff0c\u6bcf\u6761\u6d88\u606f\u90fd\u5fc5\u987b\u5206\u914d\u4e00\u6761\u552f\u4e00\u7684id\uff0c\u8fd9\u4e9bid\u8fd8\u9700\u8981\u4e00\u4e9b\u5927\u81f4\u7684\u987a\u5e8f\uff08\u65b9\u4fbf\u5ba2\u6237\u7aef\u6392\u5e8f\uff09\uff0c\u5e76\u4e14\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u4e0d\u540c\u673a\u5668\u4ea7\u751f\u7684id\u5fc5\u987b\u4e0d\u540c\u3002\n<\/p>\n<p>\n\t\u5173\u4e8e\u7684\u7b97\u6cd5\uff0c\u7f51\u4e0a\u6709\u5f88\u591a\u7684\u4ecb\u7ecd\u3002\u5927\u5bb6\u53ef\u4ee5\u641c\u7d22\u76f8\u5173\u5185\u5bb9\u8fdb\u884c\u67e5\u770b\uff0c\u672c\u6587\u4e3b\u8981\u7528java\u5b9e\u73b0\u5b83\u5728\u5206\u5e03\u5f0f\u4e0b\u7684\u751f\u6210\u65b9\u6cd5\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"Snowflake\u7b97\u6cd5\u6838\u5fc3\" src=\"http:\/\/121.40.136.3\/wp-content\/uploads\/2015\/04\/snowflake-64bit.jpg\" style=\"width: 1021px;height: 346px\" \/>\n<\/p>\n<p>\n\t\u628a\u65f6\u95f4\u6233\uff0c\u5de5\u4f5c\u673a\u5668id\uff0c\u5e8f\u5217\u53f7\u7ec4\u5408\u5728\u4e00\u8d77\u3002\n<\/p>\n<p>\n\tSnowFlake\u7684\u7ed3\u6784\u5982\u4e0b(\u6bcf\u90e8\u5206\u7528-\u5206\u5f00)\uff1a\n<\/p>\n<p>\n\t0 &#8211; 0000000000 0000000000 0000000000 0000000000 0 &#8211; 00000 &#8211; 00000 &#8211; 000000000000\n<\/p>\n<p>\n\t\u89e3\u91ca\u5982\u4e0b\uff1a\n<\/p>\n<ul>\n<li>\n\t\t1\u4f4d\u6807\u8bc6\uff0c\u7531\u4e8elong\u57fa\u672c\u7c7b\u578b\u5728Java\u4e2d\u662f\u5e26\u7b26\u53f7\u7684\uff0c\u6700\u9ad8\u4f4d\u662f\u7b26\u53f7\u4f4d\uff0c\u6b63\u6570\u662f0\uff0c\u8d1f\u6570\u662f1\uff0c\u6240\u4ee5id\u4e00\u822c\u662f\u6b63\u6570\uff0c\u6700\u9ad8\u4f4d\u662f0\n\t<\/li>\n<li>\n\t\t41\u4f4d\u65f6\u95f4\u622a(\u6beb\u79d2\u7ea7)\uff0c\u6ce8\u610f\uff0c41\u4f4d\u65f6\u95f4\u622a\u4e0d\u662f\u5b58\u50a8\u5f53\u524d\u65f6\u95f4\u7684\u65f6\u95f4\u622a\uff0c\u800c\u662f\u5b58\u50a8\u65f6\u95f4\u622a\u7684\u5dee\u503c\uff08\u5f53\u524d\u65f6\u95f4\u622a &#8211; \u5f00\u59cb\u65f6\u95f4\u622a)\u5f97\u5230\u7684\u503c\uff09\uff0c\u8fd9\u91cc\u7684\u7684\u5f00\u59cb\u65f6\u95f4\u622a\uff0c\u4e00\u822c\u662f\u6211\u4eec\u7684id\u751f\u6210\u5668\u5f00\u59cb\u4f7f\u7528\u7684\u65f6\u95f4\uff0c\u7531\u6211\u4eec\u7a0b\u5e8f\u6765\u6307\u5b9a\u7684\uff08\u5982\u4e0b\u4e0b\u9762\u7a0b\u5e8fIdWorker\u7c7b\u7684startTime\u5c5e\u6027\uff09\u300241\u4f4d\u7684\u65f6\u95f4\u622a\uff0c\u53ef\u4ee5\u4f7f\u752869\u5e74\uff0c\u5e74T = (1L &lt;&lt; 41) \/ (1000L * 60 * 60 * 24 * 365) = 69\n\t<\/li>\n<li>\n\t\t10\u4f4d\u7684\u6570\u636e\u673a\u5668\u4f4d\uff0c\u53ef\u4ee5\u90e8\u7f72\u57281024\u4e2a\u8282\u70b9\uff0c\u5305\u62ec5\u4f4ddatacenterId\u548c5\u4f4dworkerId\n\t<\/li>\n<li>\n\t\t12\u4f4d\u5e8f\u5217\uff0c\u6beb\u79d2\u5185\u7684\u8ba1\u6570\uff0c12\u4f4d\u7684\u8ba1\u6570\u987a\u5e8f\u53f7\u652f\u6301\u6bcf\u4e2a\u8282\u70b9\u6bcf\u6beb\u79d2(\u540c\u4e00\u673a\u5668\uff0c\u540c\u4e00\u65f6\u95f4\u622a)\u4ea7\u751f4096\u4e2aID\u5e8f\u53f7\n\t<\/li>\n<li>\n\t\t\u52a0\u8d77\u6765\u521a\u597d64\u4f4d\uff0c\u4e3a\u4e00\u4e2aLong\u578b\u3002\n\t<\/li>\n<\/ul>\n<p>\n\tSnowFlake\u7684\u4f18\u70b9\u662f\uff0c\u6574\u4f53\u4e0a\u6309\u7167\u65f6\u95f4\u81ea\u589e\u6392\u5e8f\uff0c\u5e76\u4e14\u6574\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u5185\u4e0d\u4f1a\u4ea7\u751fID\u78b0\u649e(\u7531\u6570\u636e\u4e2d\u5fc3ID\u548c\u673a\u5668ID\u4f5c\u533a\u5206)\uff0c\u5e76\u4e14\u6548\u7387\u8f83\u9ad8\uff0c\u7ecf\u6d4b\u8bd5\uff0cSnowFlake\u6bcf\u79d2\u80fd\u591f\u4ea7\u751f26\u4e07ID\u5de6\u53f3\u3002\n<\/p>\n<p>\n\t\u4e0b\u9762\u662fjava\u5bf9\u8be5\u7b97\u6cd5\u7684\u5b9e\u73b0\uff1a\n<\/p>\n<pre class=\"brush:java;\">\r\npublic class SnowflakeIdWorker {\r\n\t\/\/ ==============================Fields===========================================\r\n\t\/**\r\n\t * \u5f00\u59cb\u65f6\u95f4\u622a (2015-01-01)\r\n\t *\/\r\n\tprivate final long twepoch = 1420041600000L;\r\n\r\n\t\/**\r\n\t * \u673a\u5668id\u6240\u5360\u7684\u4f4d\u6570\r\n\t *\/\r\n\tprivate final long workerIdBits = 5L;\r\n\r\n\t\/**\r\n\t * \u6570\u636e\u6807\u8bc6id\u6240\u5360\u7684\u4f4d\u6570\r\n\t *\/\r\n\tprivate final long datacenterIdBits = 5L;\r\n\r\n\t\/**\r\n\t * \u652f\u6301\u7684\u6700\u5927\u673a\u5668id\uff0c\u7ed3\u679c\u662f31 (\u8fd9\u4e2a\u79fb\u4f4d\u7b97\u6cd5\u53ef\u4ee5\u5f88\u5feb\u7684\u8ba1\u7b97\u51fa\u51e0\u4f4d\u4e8c\u8fdb\u5236\u6570\u6240\u80fd\u8868\u793a\u7684\u6700\u5927\u5341\u8fdb\u5236\u6570)\r\n\t *\/\r\n\tprivate final long maxWorkerId = -1L ^ (-1L &lt;&lt; workerIdBits);\r\n\r\n\t\/**\r\n\t * \u652f\u6301\u7684\u6700\u5927\u6570\u636e\u6807\u8bc6id\uff0c\u7ed3\u679c\u662f31\r\n\t *\/\r\n\tprivate final long maxDatacenterId = -1L ^ (-1L &lt;&lt; datacenterIdBits);\r\n\r\n\t\/**\r\n\t * \u5e8f\u5217\u5728id\u4e2d\u5360\u7684\u4f4d\u6570\r\n\t *\/\r\n\tprivate final long sequenceBits = 12L;\r\n\r\n\t\/**\r\n\t * \u673a\u5668ID\u5411\u5de6\u79fb12\u4f4d\r\n\t *\/\r\n\tprivate final long workerIdShift = sequenceBits;\r\n\r\n\t\/**\r\n\t * \u6570\u636e\u6807\u8bc6id\u5411\u5de6\u79fb17\u4f4d(12+5)\r\n\t *\/\r\n\tprivate final long datacenterIdShift = sequenceBits + workerIdBits;\r\n\r\n\t\/**\r\n\t * \u65f6\u95f4\u622a\u5411\u5de6\u79fb22\u4f4d(5+5+12)\r\n\t *\/\r\n\tprivate final long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;\r\n\r\n\t\/**\r\n\t * \u751f\u6210\u5e8f\u5217\u7684\u63a9\u7801\uff0c\u8fd9\u91cc\u4e3a4095 (0b111111111111=0xfff=4095)\r\n\t *\/\r\n\tprivate final long sequenceMask = -1L ^ (-1L &lt;&lt; sequenceBits);\r\n\r\n\t\/**\r\n\t * \u5de5\u4f5c\u673a\u5668ID(0~31)\r\n\t *\/\r\n\tprivate long workerId;\r\n\r\n\t\/**\r\n\t * \u6570\u636e\u4e2d\u5fc3ID(0~31)\r\n\t *\/\r\n\tprivate long datacenterId;\r\n\r\n\t\/**\r\n\t * \u6beb\u79d2\u5185\u5e8f\u5217(0~4095)\r\n\t *\/\r\n\tprivate long sequence = 0L;\r\n\r\n\t\/**\r\n\t * \u4e0a\u6b21\u751f\u6210ID\u7684\u65f6\u95f4\u622a\r\n\t *\/\r\n\tprivate long lastTimestamp = -1L;\r\n\r\n\t\/\/==============================Constructors=====================================\r\n\r\n\t\/**\r\n\t * \u6784\u9020\u51fd\u6570\r\n\t *\r\n\t * @param workerId     \u5de5\u4f5cID (0~31)\r\n\t * @param datacenterId \u6570\u636e\u4e2d\u5fc3ID (0~31)\r\n\t *\/\r\n\tpublic SnowflakeIdWorker(long workerId, long datacenterId) {\r\n\t\tif (workerId &gt; maxWorkerId || workerId &lt; 0) {\r\n\t\t\tthrow new IllegalArgumentException(String.format(&quot;worker Id can&#039;t be greater than %d or less than 0&quot;, maxWorkerId));\r\n\t\t}\r\n\t\tif (datacenterId &gt; maxDatacenterId || datacenterId &lt; 0) {\r\n\t\t\tthrow new IllegalArgumentException(String.format(&quot;datacenter Id can&#039;t be greater than %d or less than 0&quot;, maxDatacenterId));\r\n\t\t}\r\n\t\tthis.workerId = workerId;\r\n\t\tthis.datacenterId = datacenterId;\r\n\t}\r\n\r\n\t\/\/ ==============================Methods==========================================\r\n\r\n\t\/**\r\n\t * \u83b7\u5f97\u4e0b\u4e00\u4e2aID (\u8be5\u65b9\u6cd5\u662f\u7ebf\u7a0b\u5b89\u5168\u7684)\r\n\t *\r\n\t * @return SnowflakeId\r\n\t *\/\r\n\tpublic synchronized long nextId() {\r\n\t\tlong timestamp = timeGen();\r\n\r\n\t\t\/\/\u5982\u679c\u5f53\u524d\u65f6\u95f4\u5c0f\u4e8e\u4e0a\u4e00\u6b21ID\u751f\u6210\u7684\u65f6\u95f4\u6233\uff0c\u8bf4\u660e\u7cfb\u7edf\u65f6\u949f\u56de\u9000\u8fc7\u8fd9\u4e2a\u65f6\u5019\u5e94\u5f53\u629b\u51fa\u5f02\u5e38\r\n\t\tif (timestamp &lt; lastTimestamp) {\r\n\t\t\tthrow new RuntimeException(\r\n\t\t\t\t\tString.format(&quot;Clock moved backwards.  Refusing to generate id for %d milliseconds&quot;, lastTimestamp - timestamp));\r\n\t\t}\r\n\r\n\t\t\/\/\u5982\u679c\u662f\u540c\u4e00\u65f6\u95f4\u751f\u6210\u7684\uff0c\u5219\u8fdb\u884c\u6beb\u79d2\u5185\u5e8f\u5217\r\n\t\tif (lastTimestamp == timestamp) {\r\n\t\t\tsequence = (sequence + 1) &amp; sequenceMask;\r\n\t\t\t\/\/\u6beb\u79d2\u5185\u5e8f\u5217\u6ea2\u51fa\r\n\t\t\tif (sequence == 0) {\r\n\t\t\t\t\/\/\u963b\u585e\u5230\u4e0b\u4e00\u4e2a\u6beb\u79d2,\u83b7\u5f97\u65b0\u7684\u65f6\u95f4\u6233\r\n\t\t\t\ttimestamp = tilNextMillis(lastTimestamp);\r\n\t\t\t}\r\n\t\t}\r\n\t\t\/\/\u65f6\u95f4\u6233\u6539\u53d8\uff0c\u6beb\u79d2\u5185\u5e8f\u5217\u91cd\u7f6e\r\n\t\telse {\r\n\t\t\tsequence = 0L;\r\n\t\t}\r\n\r\n\t\t\/\/\u4e0a\u6b21\u751f\u6210ID\u7684\u65f6\u95f4\u622a\r\n\t\tlastTimestamp = timestamp;\r\n\r\n\t\t\/\/\u79fb\u4f4d\u5e76\u901a\u8fc7\u6216\u8fd0\u7b97\u62fc\u5230\u4e00\u8d77\u7ec4\u621064\u4f4d\u7684ID\r\n\t\treturn ((timestamp - twepoch) &lt;&lt; timestampLeftShift) \/\/\r\n\t\t\t\t| (datacenterId &lt;&lt; datacenterIdShift) \/\/\r\n\t\t\t\t| (workerId &lt;&lt; workerIdShift) \/\/\r\n\t\t\t\t| sequence;\r\n\t}\r\n\r\n\t\/**\r\n\t * \u963b\u585e\u5230\u4e0b\u4e00\u4e2a\u6beb\u79d2\uff0c\u76f4\u5230\u83b7\u5f97\u65b0\u7684\u65f6\u95f4\u6233\r\n\t *\uff1awww.xttblog.com\r\n\t * @param lastTimestamp \u4e0a\u6b21\u751f\u6210ID\u7684\u65f6\u95f4\u622a\r\n\t * @return \u5f53\u524d\u65f6\u95f4\u6233\r\n\t *\/\r\n\tprotected long tilNextMillis(long lastTimestamp) {\r\n\t\tlong timestamp = timeGen();\r\n\t\twhile (timestamp &lt;= lastTimestamp) {\r\n\t\t\ttimestamp = timeGen();\r\n\t\t}\r\n\t\treturn timestamp;\r\n\t}\r\n\r\n\t\/**\r\n\t * \u8fd4\u56de\u4ee5\u6beb\u79d2\u4e3a\u5355\u4f4d\u7684\u5f53\u524d\u65f6\u95f4\r\n\t * @return \u5f53\u524d\u65f6\u95f4(\u6beb\u79d2)\r\n\t *\/\r\n\tprotected long timeGen() {\r\n\t\t\/\/return System.currentTimeMillis();\r\n\t\treturn SystemClock.now();\r\n\t}\r\n\r\n\t\/\/==============================Test=============================================\r\n\r\n\t\/**\r\n\t * \u6d4b\u8bd5\uff1awww.xttblog.com\r\n\t *\/\r\n\tpublic static void main(String[] args) {\r\n\t\tlong start = System.currentTimeMillis();\r\n\t\tSnowflakeIdWorker idWorker0 = new SnowflakeIdWorker(0, 0);\r\n\t\tfor (int i = 0; i &lt; 10000000; i++) {\r\n\t\t\tlong id = idWorker0.nextId();\r\n\t\t\t\/\/System.out.println(id);\r\n\t\t}\r\n\t\tSystem.out.println(&quot;\u8017\u65f6\uff1a&quot; + (System.currentTimeMillis() - start));\r\n\t}\r\n}<\/pre>\n<p>\n\t\u672c\u5b9e\u4f8b1\u4ebf\u4e2aid\u8017\u65f6\uff1a37124\u6beb\u79d2\u3002<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=2300\">java\u5b9e\u73b0\u5206\u5e03\u5f0f\u4e0bTwitter\u5168\u5c40\u552f\u4e00ID\u751f\u6210\u5668Snowflake(64\u4f4d\u81ea\u589eID\u7b97\u6cd5)<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>Twitter-Snowflake\u7b97\u6cd5\u4ea7\u751f\u7684\u80cc\u666f\u76f8\u5f53\u7b80\u5355\uff0c\u4e3a\u4e86\u6ee1\u8db3Twitter\u6bcf\u79d2\u4e0a\u4e07\u6761\u6d88\u606f\u7684\u8bf7\u6c42\uff0c\u6bcf\u6761\u6d88\u606f [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[69,1570,762],"class_list":["post-2300","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-snowflake","tag-762"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/2300","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2300"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/2300\/revisions"}],"predecessor-version":[{"id":2301,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/2300\/revisions\/2301"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2300"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}