{"id":104368,"date":"2026-09-12T13:09:20","date_gmt":"2026-09-12T05:09:20","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/104368.html"},"modified":"2026-09-12T13:09:20","modified_gmt":"2026-09-12T05:09:20","slug":"%e8%83%8c%e5%8e%8b%ef%bc%88backpressure%ef%bc%89%e8%af%a6%e8%a7%a3%ef%bc%9a%e5%93%8d%e5%ba%94%e5%bc%8f%e6%b5%81%e7%9a%84%e6%a0%b8%e5%bf%83%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/104368.html","title":{"rendered":"\u80cc\u538b\uff08Backpressure\uff09\u8be6\u89e3\uff1a\u54cd\u5e94\u5f0f\u6d41\u7684\u6838\u5fc3\u673a\u5236"},"content":{"rendered":"

\u80cc\u538b（Backpressure）\u8be6\u89e3：\u54cd\u5e94\u5f0f\u6d41\u7684\u6838\u5fc3\u673a\u5236<\/h2>\n

\u5728\u54cd\u5e94\u5f0f\u7f16\u7a0b\u548c\u5f02\u6b65\u6d41\u5904\u7406\u7cfb\u7edf\u4e2d，\u80cc\u538b（Backpressure）\u662f\u4e00\u4e2a\u6838\u5fc3\u6982\u5ff5\u3002\u5b83\u63cf\u8ff0\u7684\u662f\u4e0b\u6e38\u6d88\u8d39\u8005\u5904\u7406\u901f\u5ea6\u8ddf\u4e0d\u4e0a\u4e0a\u6e38\u751f\u4ea7\u8005\u6570\u636e\u53d1\u9001\u901f\u5ea6\u65f6，\u4e0b\u6e38\u5411\u4e0a\u6e38\u53cd\u9988\u538b\u529b，\u4ece\u800c\u63a7\u5236\u6570\u636e\u6d41\u901f\u7684\u673a\u5236\u3002<\/p>\n

\u4e00\u3001\u80cc\u538b\u7684\u672c\u8d28<\/h3>\n

1.1 \u4ec0\u4e48\u662f\u80cc\u538b？<\/h4>\n

\u60f3\u8c61\u4e00\u4e2a\u573a\u666f：\u6c34\u7ba1\u5de5\u6b63\u5728\u5411\u6c34\u6876\u91cc\u6ce8\u6c34（\u4e0a\u6e38\u751f\u4ea7\u6570\u636e），\u800c\u6c34\u6876\u5e95\u90e8\u6709\u4e00\u4e2a\u5c0f\u5b54\u5728\u653e\u6c34（\u4e0b\u6e38\u6d88\u8d39\u6570\u636e）\u3002\u5982\u679c\u8fdb\u6c34\u901f\u5ea6\u5927\u4e8e\u51fa\u6c34\u901f\u5ea6，\u6c34\u6876\u6700\u7ec8\u4f1a\u6ea2\u51fa，\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u6216\u7cfb\u7edf\u5d29\u6e83\u3002<\/p>\n

\u80cc\u538b\u5c31\u662f\u8ba9\u4e0a\u6e38\u77e5\u9053\u201c\u4e0b\u6e38\u5fd9\u4e0d\u8fc7\u6765\u4e86，\u8bf7\u653e\u6162\u4e00\u70b9\u201d\u7684\u4fe1\u53f7\u673a\u5236\u3002<\/p>\n

\u6280\u672f\u5b9a\u4e49： \u80cc\u538b\u662f\u54cd\u5e94\u5f0f\u6d41\u89c4\u8303（Reactive Streams）\u4e2d\u5b9a\u4e49\u7684\u4e00\u79cd\u673a\u5236，\u5141\u8bb8\u6d88\u8d39\u8005\u5411\u751f\u4ea7\u8005\u53d1\u51fa\u4fe1\u53f7，\u8868\u660e\u5176\u5f53\u524d\u80fd\u591f\u5904\u7406\u7684\u6570\u636e\u91cf，\u4ece\u800c\u5b9e\u73b0\u751f\u4ea7\u8005\u4e0e\u6d88\u8d39\u8005\u4e4b\u95f4\u7684\u901f\u7387\u5339\u914d\u3002<\/p>\n

1.2 \u4e3a\u4ec0\u4e48\u9700\u8981\u80cc\u538b？<\/h4>\n

\u5728\u4f20\u7edf\u540c\u6b65\u7f16\u7a0b\u4e2d，\u65b9\u6cd5\u8c03\u7528\u662f\u963b\u585e\u7684\u2014\u2014\u8c03\u7528\u65b9\u7b49\u5f85\u88ab\u8c03\u7528\u65b9\u6267\u884c\u5b8c\u6bd5，\u901f\u7387\u5929\u7136\u5339\u914d\u3002\u4f46\u5728\u5f02\u6b65\/\u54cd\u5e94\u5f0f\u7cfb\u7edf\u4e2d，\u751f\u4ea7\u8005\u53ef\u80fd\u5728\u6d88\u8d39\u8005\u5c1a\u672a\u51c6\u5907\u597d\u65f6\u6301\u7eed\u63a8\u9001\u6570\u636e，\u5bfc\u81f4：<\/p>\n\n\u95ee\u9898\u540e\u679c<\/tr>\n\n\n\n\n\n
\u5185\u5b58\u6ea2\u51fa（OOM）<\/td>\n\u6570\u636e\u5728\u7f13\u51b2\u533a\u5806\u79ef，\u8017\u5c3d JVM \u5185\u5b58<\/td>\n<\/tr>\n
\u54cd\u5e94\u5ef6\u8fdf\u589e\u52a0<\/td>\n\u7cfb\u7edf\u5fd9\u4e8e\u5904\u7406\u79ef\u538b\u6570\u636e，\u54cd\u5e94\u53d8\u6162<\/td>\n<\/tr>\n
\u8d44\u6e90\u8017\u5c3d<\/td>\n\u7ebf\u7a0b\u6c60\u3001\u8fde\u63a5\u6c60\u7b49\u8d44\u6e90\u88ab\u5360\u6ee1<\/td>\n<\/tr>\n
\u7ea7\u8054\u6545\u969c<\/td>\n\u4e00\u4e2a\u7ec4\u4ef6\u7684\u95ee\u9898\u8513\u5ef6\u5230\u6574\u4e2a\u7cfb\u7edf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e8c\u3001\u80cc\u538b\u7684\u5b9e\u73b0\u673a\u5236<\/h3>\n

2.1 \u54cd\u5e94\u5f0f\u6d41\u89c4\u8303（Reactive Streams）<\/h4>\n

\u80cc\u538b\u662f Reactive Streams \u89c4\u8303\u7684\u6838\u5fc3\u90e8\u5206\u3002\u8be5\u89c4\u8303\u5b9a\u4e49\u4e86\u56db\u4e2a\u6838\u5fc3\u63a5\u53e3：<\/p>\n

\/\/ \u53d1\u5e03\u8005：\u751f\u4ea7\u6570\u636e<\/span>
\npublic<\/span> interface<\/span> Publisher<\/span><<\/span>T<\/span>><\/span><\/span> {<\/span>
\n void<\/span> subscribe<\/span>(<\/span>Subscriber<\/span><<\/span>?<\/span> super<\/span> T<\/span>><\/span><\/span> subscriber)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u8ba2\u9605\u8005：\u6d88\u8d39\u6570\u636e<\/span>
\npublic<\/span> interface<\/span> Subscriber<\/span><<\/span>T<\/span>><\/span><\/span> {<\/span>
\n void<\/span> onSubscribe<\/span>(<\/span>Subscription<\/span> subscription)<\/span>;<\/span>
\n void<\/span> onNext<\/span>(<\/span>T<\/span> item)<\/span>;<\/span>
\n void<\/span> onError<\/span>(<\/span>Throwable<\/span> throwable)<\/span>;<\/span>
\n void<\/span> onComplete<\/span>(<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u8ba2\u9605：\u63a7\u5236\u80cc\u538b\u7684\u5173\u952e<\/span>
\npublic<\/span> interface<\/span> Subscription<\/span> {<\/span>
\n void<\/span> request<\/span>(<\/span>long<\/span> n)<\/span>;<\/span> \/\/ \u8bf7\u6c42 n \u4e2a\u6570\u636e<\/span>
\n void<\/span> cancel<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u53d6\u6d88\u8ba2\u9605<\/span>
\n}<\/span><\/p>\n

\/\/ \u5904\u7406\u5668：\u65e2\u662f\u8ba2\u9605\u8005\u53c8\u662f\u53d1\u5e03\u8005<\/span>
\npublic<\/span> interface<\/span> Processor<\/span><<\/span>T<\/span>,<\/span> R<\/span>><\/span><\/span> extends<\/span> Subscriber<\/span><<\/span>T<\/span>><\/span><\/span>,<\/span> Publisher<\/span><<\/span>R<\/span>><\/span><\/span> {<\/span>}<\/span><\/p>\n

\u5173\u952e\u673a\u5236： Subscription.request(long n) \u662f\u80cc\u538b\u7684\u6838\u5fc3\u3002\u5b83\u8ba9\u6d88\u8d39\u8005\u544a\u8bc9\u751f\u4ea7\u8005\u201c\u6211\u8fd8\u80fd\u5904\u7406 n \u4e2a\u6570\u636e\u201d，\u751f\u4ea7\u8005\u636e\u6b64\u63a7\u5236\u53d1\u9001\u901f\u5ea6\u3002<\/p>\n

2.2 \u4e24\u79cd\u80cc\u538b\u7b56\u7565<\/h4>\n

\u7b56\u7565\u4e00：\u63a8\u6a21\u5f0f（Push）<\/p>\n

\u751f\u4ea7\u8005\u4e3b\u52a8\u63a8\u9001\u6570\u636e，\u6d88\u8d39\u8005\u88ab\u52a8\u63a5\u6536\u3002\u5982\u679c\u6d88\u8d39\u8005\u901f\u5ea6\u6162，\u6570\u636e\u4f1a\u5728\u7f13\u51b2\u533a\u5806\u79ef\u3002<\/p>\n

\/\/ \u6a21\u62df\u63a8\u6a21\u5f0f：\u751f\u4ea7\u901f\u5ea6\u56fa\u5b9a 100\/\u79d2，\u6d88\u8d39\u901f\u5ea6\u53ea\u6709 10\/\u79d2<\/span>
\n\/\/ \u6570\u636e\u4f1a\u8fc5\u901f\u5806\u79ef，\u6700\u7ec8 OOM<\/span><\/p>\n

\u7b56\u7565\u4e8c：\u62c9\u6a21\u5f0f（Pull）<\/p>\n

\u6d88\u8d39\u8005\u4e3b\u52a8\u62c9\u53d6\u6570\u636e，\u751f\u4ea7\u8005\u6309\u9700\u63d0\u4f9b\u3002\u6d88\u8d39\u8005\u6bcf\u6b21\u62c9\u53d6\u81ea\u5df1\u80fd\u5904\u7406\u7684\u6570\u636e\u91cf\u3002<\/p>\n

\/\/ \u6a21\u62df\u62c9\u6a21\u5f0f：\u6d88\u8d39\u8005\u6bcf\u6b21\u8bf7\u6c42 10 \u6761，\u5904\u7406\u5b8c\u540e\u518d\u8bf7\u6c42\u4e0b\u4e00\u6279<\/span>
\n\/\/ \u751f\u4ea7\u901f\u5ea6\u81ea\u52a8\u4e0e\u6d88\u8d39\u901f\u5ea6\u5339\u914d<\/span><\/p>\n

\u54cd\u5e94\u5f0f\u6d41\u7684\u80cc\u538b\u672c\u8d28\u4e0a\u662f\u201c\u63a8\u62c9\u7ed3\u5408\u201d：\u751f\u4ea7\u8005\u53ef\u4ee5\u63a8\u9001\u6570\u636e，\u4f46\u5fc5\u987b\u9075\u5b88\u6d88\u8d39\u8005\u7684 request \u4fe1\u53f7\u2014\u2014\u6d88\u8d39\u8005\u8bf7\u6c42\u591a\u5c11，\u751f\u4ea7\u8005\u5c31\u53d1\u9001\u591a\u5c11\u3002<\/p>\n

\u4e09\u3001Reactor \u4e2d\u7684\u80cc\u538b\u5b9e\u73b0<\/h3>\n

Reactor \u662f Spring WebFlux \u7684\u5e95\u5c42\u5b9e\u73b0，\u5b8c\u6574\u5b9e\u73b0\u4e86 Reactive Streams \u89c4\u8303\u3002<\/p>\n

3.1 \u80cc\u538b\u64cd\u4f5c\u7b26<\/h4>\n

Flux<\/span>.<\/span>range<\/span>(<\/span>1<\/span>,<\/span> 1000000<\/span>)<\/span>
\n .<\/span>onBackpressureBuffer<\/span>(<\/span>)<\/span> \/\/ \u7b56\u75651：\u7f13\u51b2<\/span>
\n \/\/ .onBackpressureDrop() \/\/ \u7b56\u75652：\u4e22\u5f03<\/span>
\n \/\/ .onBackpressureLatest() \/\/ \u7b56\u75653：\u53ea\u4fdd\u7559\u6700\u65b0<\/span>
\n .<\/span>subscribe<\/span>(<\/span>new<\/span> BaseSubscriber<\/span><<\/span>Integer<\/span>><\/span><\/span>(<\/span>)<\/span> {<\/span>
\n @Override<\/span>
\n protected<\/span> void<\/span> hookOnSubscribe<\/span>(<\/span>Subscription<\/span> subscription)<\/span> {<\/span>
\n \/\/ \u521d\u59cb\u8bf7\u6c42 10 \u4e2a\u6570\u636e<\/span>
\n subscription.<\/span>request<\/span>(<\/span>10<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

@Override<\/span>
\n protected<\/span> void<\/span> hookOnNext<\/span>(<\/span>Integer<\/span> value)<\/span> {<\/span>
\n \/\/ \u5904\u7406\u6570\u636e…<\/span>
\n \/\/ \u5904\u7406\u5b8c\u540e\u7ee7\u7eed\u8bf7\u6c42 10 \u4e2a<\/span>
\n request<\/span>(<\/span>10<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>)<\/span>;<\/span><\/p>\n

3.2 \u80cc\u538b\u7b56\u7565\u8be6\u89e3<\/h4>\n\n\u7b56\u7565\u64cd\u4f5c\u7b26\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n
\u7f13\u51b2（Buffer）<\/td>\nonBackpressureBuffer()<\/td>\n\u5c06\u6ea2\u51fa\u7684\u6570\u636e\u5b58\u5165\u7f13\u51b2\u533a（\u9ed8\u8ba4\u65e0\u754c，\u53ef\u80fd OOM）<\/td>\n<\/tr>\n
\u6709\u754c\u7f13\u51b2<\/td>\nonBackpressureBuffer(int maxSize)<\/td>\n\u6307\u5b9a\u7f13\u51b2\u533a\u5927\u5c0f，\u6ea2\u51fa\u65f6\u89e6\u53d1\u9519\u8bef<\/td>\n<\/tr>\n
\u4e22\u5f03（Drop）<\/td>\nonBackpressureDrop()<\/td>\n\u6d88\u8d39\u8005\u5fd9\u4e0d\u8fc7\u6765\u65f6，\u4e22\u5f03\u65b0\u6570\u636e<\/td>\n<\/tr>\n
\u4e22\u5f03\u65e7\u6570\u636e<\/td>\nonBackpressureLatest()<\/td>\n\u53ea\u4fdd\u7559\u6700\u65b0\u6570\u636e，\u4e22\u5f03\u5c1a\u672a\u5904\u7406\u7684\u6570\u636e<\/td>\n<\/tr>\n
\u9519\u8bef（Error）<\/td>\nonBackpressureError()<\/td>\n\u65e0\u6cd5\u5904\u7406\u65f6\u629b\u51fa\u5f02\u5e38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3.3 \u5b9e\u8df5\u793a\u4f8b<\/h4>\n

\/\/ 1. \u6709\u754c\u7f13\u51b2<\/span>
\nFlux<\/span>.<\/span>interval<\/span>(<\/span>Duration<\/span>.<\/span>ofMillis<\/span>(<\/span>10<\/span>)<\/span>)<\/span> \/\/ \u6bcf 10ms \u751f\u6210\u4e00\u4e2a\u6570\u636e<\/span>
\n .<\/span>onBackpressureBuffer<\/span>(<\/span>100<\/span>)<\/span> \/\/ \u6700\u591a\u7f13\u51b2 100 \u4e2a<\/span>
\n .<\/span>subscribe<\/span>(<\/span>new<\/span> SlowConsumer<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u6d88\u8d39\u901f\u5ea6\u5f88\u6162<\/span><\/p>\n

\/\/ 2. \u4e22\u5f03\u7b56\u7565<\/span>
\nFlux<\/span>.<\/span>interval<\/span>(<\/span>Duration<\/span>.<\/span>ofMillis<\/span>(<\/span>10<\/span>)<\/span>)<\/span>
\n .<\/span>onBackpressureDrop<\/span>(<\/span>dropped -><\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u4e22\u5f03\u6570\u636e："<\/span> +<\/span> dropped)<\/span>;<\/span>
\n }<\/span>)<\/span>
\n .<\/span>subscribe<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

\/\/ 3. \u53ea\u4fdd\u7559\u6700\u65b0<\/span>
\nFlux<\/span>.<\/span>interval<\/span>(<\/span>Duration<\/span>.<\/span>ofMillis<\/span>(<\/span>10<\/span>)<\/span>)<\/span>
\n .<\/span>onBackpressureLatest<\/span>(<\/span>)<\/span>
\n .<\/span>subscribe<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

\/\/ 4. \u81ea\u5b9a\u4e49\u62c9\u53d6\u901f\u7387<\/span>
\nFlux<\/span>.<\/span>range<\/span>(<\/span>1<\/span>,<\/span> 1000<\/span>)<\/span>
\n .<\/span>subscribe<\/span>(<\/span>new<\/span> BaseSubscriber<\/span><<\/span>Integer<\/span>><\/span><\/span>(<\/span>)<\/span> {<\/span>
\n private<\/span> int<\/span> count =<\/span> 0<\/span>;<\/span>
\n private<\/span> final<\/span> int<\/span> BATCH_SIZE<\/span> =<\/span> 10<\/span>;<\/span><\/p>\n

@Override<\/span>
\n protected<\/span> void<\/span> hookOnSubscribe<\/span>(<\/span>Subscription<\/span> subscription)<\/span> {<\/span>
\n subscription.<\/span>request<\/span>(<\/span>BATCH_SIZE<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

@Override<\/span>
\n protected<\/span> void<\/span> hookOnNext<\/span>(<\/span>Integer<\/span> value)<\/span> {<\/span>
\n process<\/span>(<\/span>value)<\/span>;<\/span>
\n count++<\/span>;<\/span>
\n if<\/span> (<\/span>count %<\/span> BATCH_SIZE<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span>
\n request<\/span>(<\/span>BATCH_SIZE<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>)<\/span>;<\/span><\/p>\n

\u56db\u3001\u80cc\u538b\u4e0e\u4f20\u7edf\u6d41\u63a7\u7684\u5bf9\u6bd4<\/h3>\n\n\u5bf9\u6bd4\u7ef4\u5ea6\u80cc\u538b（Reactive Streams）\u9650\u6d41（Rate Limiter）\u7194\u65ad（Circuit Breaker）<\/tr>\n\n\n\n\n\n
\u76ee\u6807<\/td>\n\u5339\u914d\u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u901f\u7387<\/td>\n\u9650\u5236\u8bf7\u6c42\u603b\u91cf<\/td>\n\u9632\u6b62\u6545\u969c\u6269\u6563<\/td>\n<\/tr>\n
\u65b9\u5411<\/td>\n\u4e0b\u6e38\u63a7\u5236\u4e0a\u6e38<\/td>\n\u4e0a\u6e38\u81ea\u6211\u9650\u5236<\/td>\n\u4e2d\u65ad\u8c03\u7528\u94fe<\/td>\n<\/tr>\n
\u7c92\u5ea6<\/td>\n\u6bcf\u4e2a\u6570\u636e\u6d41<\/td>\n\u6bcf\u4e2a\u65f6\u95f4\u7a97\u53e3<\/td>\n\u670d\u52a1\u7ea7\u522b<\/td>\n<\/tr>\n
\u53cd\u9988\u673a\u5236<\/td>\nrequest(n) \u4fe1\u53f7<\/td>\n\u62d2\u7edd\/\u6392\u961f<\/td>\n\u5feb\u901f\u5931\u8d25\/\u964d\u7ea7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e94\u3001\u80cc\u538b\u7684\u5c40\u9650\u4e0e\u6311\u6218<\/h3>\n

5.1 \u9002\u7528\u6027\u9650\u5236<\/h4>\n
    \n
  • \u963b\u585e I\/O \u573a\u666f：JDBC\u3001\u963b\u585e HTTP \u5ba2\u6237\u7aef\u7b49\u65e0\u6cd5\u6709\u6548\u652f\u6301\u80cc\u538b<\/li>\n
  • \u65e0\u80cc\u538b\u7684\u6570\u636e\u6e90：\u6587\u4ef6\u7cfb\u7edf\u3001\u7f51\u7edc\u5957\u63a5\u5b57\u7b49\u65e0\u6cd5\u54cd\u5e94\u80cc\u538b\u4fe1\u53f7<\/li>\n
  • \u5355\u7ebf\u7a0b\u6d88\u8d39\u8005：\u5373\u4f7f\u6709\u80cc\u538b，\u5355\u7ebf\u7a0b\u6d88\u8d39\u4e5f\u65e0\u6cd5\u8d85\u8fc7 CPU \u5904\u7406\u6781\u9650<\/li>\n<\/ul>\n

    5.2 \u8bef\u533a\u4e0e\u9677\u9631<\/h4>\n

    \/\/ \u274c \u8bef\u533a：\u8ba4\u4e3a\u80cc\u538b\u81ea\u52a8\u89e3\u51b3\u6240\u6709\u6027\u80fd\u95ee\u9898<\/span>
    \n\/\/ \u80cc\u538b\u53ea\u662f\u8ba9\u6162\u6d88\u8d39\u8005\u4e0d\u88ab\u538b\u57ae，\u4e0d\u80fd\u8ba9\u5feb\u6d88\u8d39\u8005\u53d8\u6162<\/span><\/p>\n

    \/\/ \u274c \u8bef\u533a：\u4f7f\u7528\u65e0\u754c\u7f13\u51b2\u533a<\/span>
    \nonBackpressureBuffer<\/span>(<\/span>)<\/span> \/\/ \u53ef\u80fd\u5bfc\u81f4 OOM<\/span><\/p>\n

    \/\/ \u2705 \u6b63\u786e：\u4f7f\u7528\u6709\u754c\u7f13\u51b2\u533a<\/span>
    \nonBackpressureBuffer<\/span>(<\/span>1000<\/span>)<\/span><\/p>\n

    \/\/ \u2705 \u66f4\u597d：\u660e\u786e\u8bbe\u7f6e\u6ea2\u51fa\u7b56\u7565<\/span>
    \nonBackpressureBuffer<\/span>(<\/span>1000<\/span>,<\/span> BufferOverflowStrategy<\/span>.<\/span>DROP_OLDEST<\/span>)<\/span><\/p>\n

    \u516d\u3001Spring WebFlux \u4e2d\u7684\u80cc\u538b<\/h3>\n

    Spring WebFlux \u57fa\u4e8e Reactor \u6784\u5efa，\u5929\u7136\u652f\u6301\u80cc\u538b：<\/p>\n

    @RestController<\/span>
    \npublic<\/span> class<\/span> UserController<\/span> {<\/span><\/p>\n

    @GetMapping<\/span>(<\/span>"\/users"<\/span>)<\/span>
    \n public<\/span> Flux<\/span><<\/span>User<\/span>><\/span><\/span> getUsers<\/span>(<\/span>)<\/span> {<\/span>
    \n \/\/ \u6570\u636e\u5e93\u8fd4\u56de\u7684 Flux \u4f1a\u81ea\u52a8\u5e94\u7528\u80cc\u538b<\/span>
    \n return<\/span> userRepository.<\/span>findAll<\/span>(<\/span>)<\/span>;<\/span>
    \n \/\/ WebFlux \u4f1a\u6839\u636e\u5ba2\u6237\u7aef\u6d88\u8d39\u901f\u5ea6\u81ea\u52a8\u63a7\u5236\u6570\u636e\u53d1\u9001<\/span>
    \n }<\/span><\/p>\n

    @GetMapping<\/span>(<\/span>value =<\/span> "\/events"<\/span>,<\/span> produces =<\/span> MediaType<\/span>.<\/span>TEXT_EVENT_STREAM_VALUE<\/span>)<\/span>
    \n public<\/span> Flux<\/span><<\/span>ServerSentEvent<\/span>><\/span><\/span> streamEvents<\/span>(<\/span>)<\/span> {<\/span>
    \n return<\/span> Flux<\/span>.<\/span>interval<\/span>(<\/span>Duration<\/span>.<\/span>ofSeconds<\/span>(<\/span>1<\/span>)<\/span>)<\/span>
    \n .<\/span>map<\/span>(<\/span>i -><\/span> ServerSentEvent<\/span>.<\/span>builder<\/span>(<\/span>)<\/span>
    \n .<\/span>data<\/span>(<\/span>"Event "<\/span> +<\/span> i)<\/span>
    \n .<\/span>build<\/span>(<\/span>)<\/span>)<\/span>
    \n \/\/ \u5f53\u5ba2\u6237\u7aef\u6d88\u8d39\u6162\u65f6，\u670d\u52a1\u7aef\u4f1a\u5e94\u7528\u80cc\u538b\u7b56\u7565<\/span>
    \n .<\/span>onBackpressureDrop<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u4e22\u5f03\u65e0\u6cd5\u53d1\u9001\u7684\u6570\u636e<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u4e03\u3001\u603b\u7ed3<\/h3>\n

    \u80cc\u538b\u662f\u54cd\u5e94\u5f0f\u7f16\u7a0b\u4e2d\u5904\u7406\u901f\u7387\u4e0d\u5339\u914d\u95ee\u9898\u7684\u6838\u5fc3\u673a\u5236\u3002\u5b83\u901a\u8fc7 Subscription.request(n) \u5b9e\u73b0\u4e0b\u6e38\u5bf9\u4e0a\u6e38\u7684\u6d41\u91cf\u63a7\u5236，\u4ece\u6839\u672c\u4e0a\u907f\u514d\u4e86\u6570\u636e\u5806\u79ef\u5bfc\u81f4\u7684\u7cfb\u7edf\u5d29\u6e83\u3002<\/p>\n

    \u6838\u5fc3\u8981\u70b9：<\/p>\n

      \n
    • \u80cc\u538b\u662f\u4e00\u79cd\u53cd\u9988\u673a\u5236：\u4e0b\u6e38\u544a\u8bc9\u4e0a\u6e38\u201c\u6211\u80fd\u5904\u7406\u591a\u5c11\u201d<\/li>\n
    • Reactive Streams \u662f\u6807\u51c6：\u5b9a\u4e49\u4e86\u53d1\u5e03\u8005\u3001\u8ba2\u9605\u8005\u3001\u8ba2\u9605\u4e4b\u95f4\u7684\u5951\u7ea6<\/li>\n
    • Reactor \u63d0\u4f9b\u591a\u79cd\u7b56\u7565：\u7f13\u51b2\u3001\u4e22\u5f03\u3001\u6700\u65b0\u3001\u9519\u8bef<\/li>\n
    • \u4e0d\u662f\u4e07\u80fd\u7684：\u963b\u585e I\/O \u548c\u65e0\u80cc\u538b\u6570\u636e\u6e90\u9700\u8981\u989d\u5916\u5904\u7406<\/li>\n
    • \u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u5c24\u4e3a\u91cd\u8981：\u5fae\u670d\u52a1\u95f4\u7684\u5f02\u6b65\u901a\u4fe1\u4f9d\u8d56\u80cc\u538b\u9632\u6b62\u7ea7\u8054\u6545\u969c<\/li>\n<\/ul>\n

      \u5728\u6784\u5efa\u9ad8\u541e\u5410\u3001\u4f4e\u5ef6\u8fdf\u7684\u5f02\u6b65\u7cfb\u7edf\u65f6，\u80cc\u538b\u662f\u4e00\u4e2a\u5fc5\u987b\u7406\u89e3\u7684\u6982\u5ff5\u3002\u5b83\u8ba9\u7cfb\u7edf\u5728\u9762\u5bf9\u7a81\u53d1\u6d41\u91cf\u65f6，\u4e0d\u662f\u88ab\u538b\u57ae，\u800c\u662f\u4f18\u96c5\u5730\u964d\u901f，\u4fdd\u6301\u7a33\u5b9a\u8fd0\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u80cc\u538b（Backpressure）\u8be6\u89e3：\u54cd\u5e94\u5f0f\u6d41\u7684\u6838\u5fc3\u673a\u5236
      \n\u5728\u54cd\u5e94\u5f0f\u7f16\u7a0b\u548c\u5f02\u6b65\u6d41\u5904\u7406\u7cfb\u7edf\u4e2d，\u80cc\u538b（Backpressure）\u662f\u4e00\u4e2a\u6838\u5fc3\u6982\u5ff5\u3002\u5b83\u63cf\u8ff0\u7684\u662f\u4e0b\u6e38\u6d88\u8d39\u8005\u5904\u7406\u901f\u5ea6\u8ddf\u4e0d\u4e0a\u4e0a\u6e38\u751f\u4ea7\u8005\u6570\u636e\u53d1\u9001\u901f\u5ea6\u65f6，\u4e0b\u6e38\u5411\u4e0a\u6e38\u53cd\u9988\u538b\u529b，\u4ece\u800c\u63a7\u5236\u6570\u636e\u6d41\u901f\u7684\u673a\u5236\u3002
      \n\u4e00\u3001\u80cc\u538b\u7684\u672c\u8d28
      \n1.1 \u4ec0\u4e48\u662f\u80cc\u538b？
      \n\u60f3\u8c61\u4e00\u4e2a\u573a\u666f：\u6c34\u7ba1\u5de5\u6b63\u5728\u5411\u6c34\u6876\u91cc\u6ce8\u6c34（\u4e0a\u6e38\u751f<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[190],"topic":[],"class_list":["post-104368","post","type-post","status-publish","format-standard","hentry","category-server","tag-190"],"yoast_head":"\n\u80cc\u538b\uff08Backpressure\uff09\u8be6\u89e3\uff1a\u54cd\u5e94\u5f0f\u6d41\u7684\u6838\u5fc3\u673a\u5236 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/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.wsisp.com\/helps\/104368.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u80cc\u538b\uff08Backpressure\uff09\u8be6\u89e3\uff1a\u54cd\u5e94\u5f0f\u6d41\u7684\u6838\u5fc3\u673a\u5236 - 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