{"id":4303,"date":"2019-06-10T15:05:49","date_gmt":"2019-06-10T07:05:49","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4303"},"modified":"2019-06-10T15:05:49","modified_gmt":"2019-06-10T07:05:49","slug":"%e7%94%b5%e5%95%86%e7%b3%bb%e7%bb%9f%e4%b8%ad%e7%9a%84%e7%a7%92%e6%9d%80%e9%ab%98%e5%b9%b6%e5%8f%91%e5%8d%95%e6%9c%ba%e9%99%90%e6%b5%81%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4303","title":{"rendered":"\u7535\u5546\u7cfb\u7edf\u4e2d\u7684\u79d2\u6740\u9ad8\u5e76\u53d1\u5355\u673a\u9650\u6d41\u5b9e\u6218"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u4eca\u5929\uff0c\u62bd\u7a7a\uff0c\u6211\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u4e00\u4e0b\u9650\u6d41\u3002\u76ee\u524d\u5173\u4e8e\u9650\u6d41\u7684\u6846\u67b6\u548c\u5de5\u5177\u90fd\u6bd4\u8f83\u591a\uff0c\u6bd4\u5982 Redis\u3001\u963f\u91cc\u7684 Sentinel\u3001Nginx\u3001OpenResty 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class=\"wp-block-paragraph\">\u6f0f\u6876\u7b97\u6cd5\u5c31\u50cf\u4e00\u4e2a\u6f0f\u6597\u4e00\u6837\uff0c\u8fdb\u6765\u7684\u6c34\u91cf\u5c31\u597d\u50cf\u8bbf\u95ee\u6d41\u91cf\u4e00\u6837\uff0c\u800c\u51fa\u53bb\u7684\u6c34\u91cf\u5c31\u50cf\u662f\u6211\u4eec\u7684\u7cfb\u7edf\u5904\u7406\u8bf7\u6c42\u4e00\u6837\u3002\u5f53\u8bbf\u95ee\u6d41\u91cf\u8fc7\u5927\u65f6\uff0c\u8fd9\u4e2a\u6f0f\u6597\u4e2d\u5c31\u4f1a\u79ef\u6c34\uff0c\u5982\u679c\u6c34\u592a\u591a\u4e86\u5c31\u4f1a\u6ea2\u51fa\uff0c\u76f4\u63a5\u54cd\u5e94\u8d85\u65f6\u6216\u8005\u7cfb\u7edf\u7e41\u5fd9\u7b49\u60c5\u51b5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6f0f\u6876\u7b97\u6cd5\u7684\u5b9e\u73b0\u5f80\u5f80\u4f9d\u8d56\u4e8e\u961f\u5217\uff0c\u8bf7\u6c42\u5230\u8fbe\u65f6\uff0c\u5982\u679c\u961f\u5217\u672a\u6ee1\u5219\u76f4\u63a5\u653e\u5165\u961f\u5217\uff0c\u5982\u679c\u6ee1\u4e86\u5219\u6ea2\u51fa\u3002\u7136\u540e\u6709\u4e00\u4e2a\u5904\u7406\u5668\u6309\u7167\u56fa\u5b9a\u9891\u7387\u4ece\u961f\u5217\u5934\u53d6\u51fa\u8bf7\u6c42\u8fdb\u884c\u5904\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6839\u636e\u751f\u6d3b\u4e2d\u7684\u73b0\u8c61\u4ee5\u53ca\u4e0a\u56fe\u4e2d\u63cf\u8ff0\u7684\u51fa\u6c34\u901f\u7387\u6052\u5b9a\u3002\u56e0\u6b64\u6f0f\u6876\u7b97\u6cd5\u7684\u4e00\u4e2a\u91cd\u8981\u7279\u5f81\u6216\u7f3a\u70b9\u662f\uff0c\u5b83\u7684\u8f93\u51fa\u901f\u7387\u662f\u6052\u5b9a\u7684\uff0c\u8fd9\u4e5f\u662f\u533a\u522b\u4e8e\u4ee4\u724c\u6876\u7684\u6839\u672c\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g3w2e7ncq5j20b907vt93.jpg\" alt=\"\" \/><figcaption>\u4ee4\u724c\u6876\u7b97\u6cd5\u793a\u610f\u56fe<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee4\u724c\u6876\u7b97\u6cd5\u5219\u662f\u4e00\u4e2a\u5b58\u653e\u56fa\u5b9a\u5bb9\u91cf\u4ee4\u724c\u7684\u6876\uff0c\u6309\u7167\u56fa\u5b9a\u901f\u7387\u5f80\u6876\u91cc\u6dfb\u52a0\u4ee4\u724c\u3002\u6876\u4e2d\u5b58\u653e\u7684\u4ee4\u724c\u6570\u6709\u6700\u5927\u4e0a\u9650\uff0c\u8d85\u51fa\u4e4b\u540e\u5c31\u88ab\u4e22\u5f03\u6216\u8005\u62d2\u7edd\u3002\u5f53\u6d41\u91cf\u6216\u8005\u7f51\u7edc\u8bf7\u6c42\u5230\u8fbe\u65f6\uff0c\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u8981\u83b7\u53d6\u4e00\u4e2a\u4ee4\u724c\uff0c\u5982\u679c\u80fd\u591f\u83b7\u53d6\u5230\uff0c\u5219\u76f4\u63a5\u5904\u7406\uff0c\u5e76\u4e14\u4ee4\u724c\u6876\u5220\u9664\u4e00\u4e2a\u4ee4\u724c\u3002\u5982\u679c\u83b7\u53d6\u4e0d\u5230\uff0c\u8be5\u8bf7\u6c42\u5c31\u8981\u88ab\u9650\u6d41\uff0c\u8981\u4e48\u76f4\u63a5\u4e22\u5f03\uff0c\u8981\u4e48\u5728\u7f13\u51b2\u533a\u7b49\u5f85\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee4\u724c\u6876\u7b97\u6cd5\u548c\u6f0f\u6876\u7b97\u6cd5\u7684\u4e3b\u8981\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u6f0f\u6876\u662f\u51fa\uff0c\u4ee4\u724c\u662f\u8fdb<\/li><li>\u4ee4\u724c\u662f\u5141\u8bb8\u4f38\u7f29\u7684<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6f0f\u6876\u7b97\u6cd5\u4e0d\u80fd\u591f\u6709\u6548\u5730\u4f7f\u7528\u7f51\u7edc\u8d44\u6e90\uff0c\u56e0\u4e3a\u6f0f\u6876\u7684\u6f0f\u51fa\u901f\u7387\u662f\u56fa\u5b9a\u7684\uff0c\u6240\u4ee5\u5373\u4f7f\u7f51\u7edc\u4e2d\u6ca1\u6709\u53d1\u751f\u62e5\u585e\uff0c\u6f0f\u6876\u7b97\u6cd5\u4e5f\u4e0d\u80fd\u4f7f\u67d0\u4e00\u4e2a\u5355\u72ec\u7684\u6570\u636e\u6d41\u8fbe\u5230\u7aef\u53e3\u901f\u7387\u3002\u56e0\u6b64\uff0c\u6f0f\u6876\u7b97\u6cd5\u5bf9\u4e8e\u5b58\u5728\u7a81\u53d1\u7279\u6027\u7684\u6d41\u91cf\u6765\u8bf4\u7f3a\u4e4f\u6548\u7387\u3002\u800c\u4ee4\u724c\u6876\u7b97\u6cd5\u5219\u80fd\u591f\u6ee1\u8db3\u8fd9\u4e9b\u5177\u6709\u7a81\u53d1\u7279\u6027\u7684\u6d41\u91cf\u3002\u901a\u5e38\uff0c\u6f0f\u6876\u7b97\u6cd5\u4e0e\u4ee4\u724c\u6876\u7b97\u6cd5\u7ed3\u5408\u8d77\u6765\u4e3a\u7f51\u7edc\u6d41\u91cf\u63d0\u4f9b\u66f4\u9ad8\u6548\u7684\u63a7\u5236\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e24\u4e2a\u7b97\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u6211\u5c31\u4e0d\u5217\u4e3e\u4ee3\u7801\u4e86\u3002\u6211\u4eec\u4eca\u5929\u76f4\u63a5\u6765\u4f7f\u7528 Guava \u8fd9\u4e2a\u5f00\u773c\u6846\u67b6\u6765\u5b9e\u73b0\u9650\u6d41\uff0c\u8fd9\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u5de5\u5177\u7c7b\u6846\u67b6\uff0c\u5982\u679c\u4f60\u628a\u5b83\u7684\u6e90\u7801\u5b8c\u6574\u7684\u770b\u4e00\u904d\uff0c\u6211\u76f8\u4fe1\u4f60\u7684\u6280\u80fd\u4f1a\u6709\u5f88\u5927\u7684\u63d0\u5347\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Guava \u7684 RateLimiter \u5b9e\u73b0\u4ee4\u724c\u6876\u7b97\u6cd5\uff1aSmoothBursty \u5b9e\u73b0\u4e86\u5e73\u6ed1\u7a81\u53d1\u9650\u6d41\u3001SmoothWarmingUp \u5b9e\u73b0\u4e86\u5e73\u6ed1\u9884\u70ed\u9650\u6d41\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">RateLimiter \u91c7\u7528\u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\uff0c\u6839\u636e\u8c03\u7528\u53c2\u6570\u7684\u4e0d\u540c\uff0c\u751f\u6210 \u4e24\u4e2a\u4e0d\u540c\u7684 RateLimiter \u5b50\u7c7b\uff1aSmoothBursty \u548c SmoothWarmingUp\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>static RateLimiter create(SleepingStopwatch stopwatch, \n    double permitsPerSecond) {\n    RateLimiter rateLimiter = new SmoothBursty(stopwatch, \n    1.0 \/* maxBurstSeconds *\/);\n    rateLimiter.setRate(permitsPerSecond);\n    return rateLimiter;\n}\nstatic RateLimiter create(\n    SleepingStopwatch stopwatch,\n    double permitsPerSecond,\n    long warmupPeriod,\n    TimeUnit unit,\n    double coldFactor) {\n    RateLimiter rateLimiter = new SmoothWarmingUp(stopwatch, \n    warmupPeriod, unit, coldFactor);\n    rateLimiter.setRate(permitsPerSecond);\n    return rateLimiter;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">RateLimiter \u7c7b\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5b89\u5168\u7684\u7c7b\uff0c\u5927\u5bb6\u53ef\u4ee5\u653e\u5fc3\u7684\u4f7f\u7528\u3002\u4e0b\u9762\u770b\u4e00\u4e0b\u6211\u7684\u5355\u673a\u8131\u654f\u540e\u7684\u79d2\u6740\u7b80\u5316\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String[] args) {\n    \/\/0.5\u4ee3\u8868\u4e00\u79d2\u6700\u591a\u591a\u5c11\u4e2a\n    RateLimiter rateLimiter = RateLimiter.create(0.5);\n    List&lt;Runnable&gt; tasks = new ArrayList&lt;Runnable&gt;();\n    for (int i = 0; i &lt; 10; i++) {\n        tasks.add(new SeckillRequest(i));\n    }\n    ExecutorService threadPool = Executors.newCachedThreadPool();\n    for (Runnable runnable : tasks) {\n        System.out.println(\"\u7b49\u5f85\u65f6\u95f4\uff1a\" + rateLimiter.acquire());\n        threadPool.execute(runnable);\n    }\n}\nprivate static class SeckillRequest implements Runnable {\n    private int id;\n    public SeckillRequest(int id) {\n        this.id = id;\n    }\n    public void run() {\n        System.out.println(id);\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">SmoothWarmingUp \u521b\u5efa\u65b9\u5f0f\u8981\u4f7f\u7528\u8fd9\u4e2a\u51fd\u6570\uff1aRateLimiter.create(doublepermitsPerSecond, long warmupPeriod, TimeUnit unit)\u3002\u5176\u4e2d permitsPerSecond \u53c2\u6570\u8868\u793a\u6bcf\u79d2\u65b0\u589e\u7684\u4ee4\u724c\u6570\uff0cwarmupPeriod \u53c2\u6570\u8868\u793a\u5728\u4ece\u51b7\u542f\u52a8\u901f\u7387\u8fc7\u6e21\u5230\u5e73\u5747\u901f\u7387\u7684\u65f6\u95f4\u95f4\u9694\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>RateLimiter limiter = RateLimiter.create(5, 1000, TimeUnit.MILLISECONDS);\nfor(int i = 1; i &lt; 5;i++) {\n    System.out.println(limiter.acquire());\n}\nThread.sleep(1000L);\nfor(int i = 1; i &lt; 5;i++) {\n    System.out.println(limiter.acquire());\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">SmoothWarmingUp 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