{"id":1422,"date":"2023-05-30T21:56:02","date_gmt":"2023-05-30T13:56:02","guid":{"rendered":"https:\/\/fireinsect.top\/?p=1422"},"modified":"2023-05-30T21:56:02","modified_gmt":"2023-05-30T13:56:02","slug":"springcloud%e5%9f%ba%e7%a1%80%ef%bc%885%ef%bc%89-loaderbanacer-%e8%b4%9f%e8%bd%bd%e5%9d%87%e8%a1%a1","status":"publish","type":"post","link":"https:\/\/fireinsect.top\/index.php\/2023\/05\/30\/springcloud%e5%9f%ba%e7%a1%80%ef%bc%885%ef%bc%89-loaderbanacer-%e8%b4%9f%e8%bd%bd%e5%9d%87%e8%a1%a1\/","title":{"rendered":"SpringCloud\u57fa\u7840\uff085\uff09–LoaderBanacer \u8d1f\u8f7d\u5747\u8861"},"content":{"rendered":"\n

\u5728\u4e4b\u524d\u6211\u4eec\u8fdb\u884c\u670d\u52a1\u9ad8\u53ef\u7528\u65f6\uff0c\u63d0\u5230\u8fc7\u8d1f\u8f7d\u5747\u8861\u7684\u6982\u5ff5\uff0c\u5373\u901a\u8fc7\u5c06\u4e00\u4e2a\u670d\u52a1\u8fdb\u884c\u591a\u4e2a\u90e8\u7f72\uff0c\u5e73\u644a\u670d\u52a1\u538b\u529b\uff0c\u5b9e\u73b0\u8d1f\u8f7d\u7684\u5747\u8861\u3002<\/p>\n\n\n\n\n\n\n\n

\u8d1f\u8f7d\u5747\u8861\u7684\u6982\u5ff5\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u60f3\u65b9\u8bbe\u6cd5\u5206\u62c5\u670d\u52a1\u538b\u529b\uff0c\u90a3\u4e48\u8d1f\u8f7d\u5747\u8861\u662f\u5982\u4f55\u8fdb\u884c\u7684\u5462\uff1f<\/p>\n\n\n\n

\u5b9e\u9645\u4e0a\uff0c\u5728\u6dfb\u52a0@LoadBalanced<\/code>\u6ce8\u89e3\u4e4b\u540e\uff0c\u4f1a\u542f\u7528\u62e6\u622a\u5668\u5bf9\u6211\u4eec\u53d1\u8d77\u7684\u670d\u52a1\u8c03\u7528\u8bf7\u6c42\u8fdb\u884c\u62e6\u622a\uff08\u6ce8\u610f\u8fd9\u91cc\u662f\u9488\u5bf9\u6211\u4eec\u53d1\u8d77\u7684\u8bf7\u6c42\u8fdb\u884c\u62e6\u622a\uff09\uff0c\u53eb\u505aLoadBalancerInterceptor<\/code>\uff0c\u5b83\u5b9e\u73b0ClientHttpRequestInterceptor<\/code>\u63a5\u53e3\uff1a<\/p>\n\n\n\n

@FunctionalInterface\r\npublic interface ClientHttpRequestInterceptor {\r\n    ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException;\r\n}<\/code><\/pre>\n\n\n\n
\u4e3b\u8981\u662f\u5bf9intercept<\/code>\u65b9\u6cd5\u7684\u5b9e\u73b0\uff1a<\/p>\n\n\n\n
public ClientHttpResponse intercept(final HttpRequest request, final byte[] body, final ClientHttpRequestExecution execution) throws IOException {\r\n    URI originalUri = request.getURI();\r\n    String serviceName = originalUri.getHost();\r\n    Assert.state(serviceName != null, \"Request URI does not contain a valid hostname: \" + originalUri);\r\n    return (ClientHttpResponse)this.loadBalancer.execute(serviceName, this.requestFactory.createRequest(request, body, execution));\r\n}<\/code><\/pre>\n\n\n\n
\u670d\u52a1\u7aef\u4f1a\u5728\u53d1\u8d77\u8bf7\u6c42\u65f6\u6267\u884c\u8fd9\u4e9b\u62e6\u622a\u5668\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u8fd9\u4e2a\u62e6\u622a\u5668\u505a\u4e86\u4ec0\u4e48\u4e8b\u60c5\u5462\uff0c\u9996\u5148\u6211\u4eec\u8981\u660e\u786e\uff0c\u6211\u4eec\u7ed9\u8fc7\u6765\u7684\u8bf7\u6c42\u5730\u5740\uff0c\u5e76\u4e0d\u662f\u4e00\u4e2a\u6709\u6548\u7684\u4e3b\u673a\u540d\u79f0\uff0c\u800c\u662f\u670d\u52a1\u540d\u79f0\uff0c\u90a3\u4e48\u600e\u4e48\u624d\u80fd\u5f97\u5230\u771f\u6b63\u9700\u8981\u8bbf\u95ee\u7684\u4e3b\u673a\u540d\u79f0\u5462\uff0c\u80af\u5b9a\u662f\u5f97\u627eEureka\u83b7\u53d6\u7684\u3002<\/p>\n\n\n\n
\u6211\u4eec\u6765\u770b\u770bloadBalancer.execute()<\/code>\u505a\u4e86\u4ec0\u4e48\uff0c\u5b83\u7684\u5177\u4f53\u5b9e\u73b0\u4e3aBlockingLoadBalancerClient<\/code>\uff1a<\/p>\n\n\n\n
\/\/\u4ece\u4e0a\u9762\u7ed9\u8fdb\u6765\u4e86\u670d\u52a1\u7684\u540d\u79f0\u548c\u5177\u4f53\u7684\u8bf7\u6c42\u5b9e\u4f53\r\npublic <T> T execute(String serviceId, LoadBalancerRequest<T> request) throws IOException {\r\n    String hint = this.getHint(serviceId);\r\n    LoadBalancerRequestAdapter<T, DefaultRequestContext> lbRequest = new LoadBalancerRequestAdapter(request, new DefaultRequestContext(request, hint));\r\n    Set<LoadBalancerLifecycle> supportedLifecycleProcessors = this.getSupportedLifecycleProcessors(serviceId);\r\n    supportedLifecycleProcessors.forEach((lifecycle) -> {\r\n        lifecycle.onStart(lbRequest);\r\n    });\r\n      \/\/\u53ef\u4ee5\u770b\u5230\u5728\u8fd9\u91cc\u4f1a\u8c03\u7528choose\u65b9\u6cd5\u81ea\u52a8\u83b7\u53d6\u5bf9\u5e94\u7684\u670d\u52a1\u5b9e\u4f8b\u4fe1\u606f\r\n    ServiceInstance serviceInstance = this.choose(serviceId, lbRequest);\r\n    if (serviceInstance == null) {\r\n        supportedLifecycleProcessors.forEach((lifecycle) -> {\r\n            lifecycle.onComplete(new CompletionContext(Status.DISCARD, lbRequest, new EmptyResponse()));\r\n        });\r\n          \/\/\u6ca1\u6709\u53d1\u73b0\u4efb\u4f55\u6b64\u670d\u52a1\u7684\u5b9e\u4f8b\u5c31\u629b\u5f02\u5e38\uff08\u4e4b\u524d\u7684\u6d4b\u8bd5\u4e2d\u53ef\u80fd\u5df2\u7ecf\u9047\u5230\u4e86\uff09\r\n        throw new IllegalStateException(\"No instances available for \" + serviceId);\r\n    } else {\r\n          \/\/\u6210\u529f\u83b7\u53d6\u5230\u5bf9\u5e94\u670d\u52a1\u7684\u5b9e\u4f8b\uff0c\u8fd9\u65f6\u5c31\u53ef\u4ee5\u53d1\u8d77HTTP\u8bf7\u6c42\u83b7\u53d6\u4fe1\u606f\u4e86\r\n        return this.execute(serviceId, serviceInstance, lbRequest);\r\n    }\r\n}<\/code><\/pre>\n\n\n\n
\u6240\u4ee5\uff0c\u5b9e\u9645\u4e0a\u5728\u8fdb\u884c\u8d1f\u8f7d\u5747\u8861\u7684\u65f6\u5019\uff0c\u4f1a\u5411Eureka\u53d1\u8d77\u8bf7\u6c42\uff0c\u9009\u62e9\u4e00\u4e2a\u53ef\u7528\u7684\u5bf9\u5e94\u670d\u52a1\uff0c\u7136\u540e\u4f1a\u8fd4\u56de\u6b64\u670d\u52a1\u7684\u4e3b\u673a\u5730\u5740\u7b49\u4fe1\u606f<\/p>\n\n\n\n
<\/div>\n\n\n\n
\u81ea\u5b9a\u4e49\u8d1f\u8f7d\u5747\u8861\u7b56\u7565<\/p>\n\n\n\n
LoadBalancer\u9ed8\u8ba4\u63d0\u4f9b\u4e86\u4e24\u79cd\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\uff1a<\/p>\n\n\n\n
    \n
  • RandomLoadBalancer – \u968f\u673a\u5206\u914d\u7b56\u7565<\/li>\n\n\n\n
  • (\u9ed8\u8ba4)<\/strong> RoundRobinLoadBalancer – \u8f6e\u8be2\u5206\u914d\u7b56\u7565<\/li>\n<\/ul>\n\n\n\n
    \u73b0\u5728\u6211\u4eec\u5e0c\u671b\u4fee\u6539\u9ed8\u8ba4\u7684\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\uff0c\u53ef\u4ee5\u8fdb\u884c\u6307\u5b9a\uff0c\u6bd4\u5982\u6211\u4eec\u73b0\u5728\u5e0c\u671b\u7528\u6237\u670d\u52a1\u91c7\u7528\u968f\u673a\u5206\u914d\u7b56\u7565\uff0c\u6211\u4eec\u9700\u8981\u5148\u521b\u5efa\u968f\u673a\u5206\u914d\u7b56\u7565\u7684\u914d\u7f6e\u7c7b\uff08\u4e0d\u7528\u52a0@Configuration<\/code>\uff09\uff1a<\/p>\n\n\n\n
    public class LoadBalancerConfig {\r\n      \/\/\u5c06\u5b98\u65b9\u63d0\u4f9b\u7684 RandomLoadBalancer \u6ce8\u518c\u4e3aBean\r\n    @Bean\r\n    public ReactorLoadBalancer<ServiceInstance> randomLoadBalancer(Environment environment, LoadBalancerClientFactory loadBalancerClientFactory){\r\n        String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);\r\n        return new RandomLoadBalancer(loadBalancerClientFactory.getLazyProvider(name, ServiceInstanceListSupplier.class), name);\r\n    }\r\n}<\/code><\/pre>\n\n\n\n
    \u63a5\u7740\u6211\u4eec\u9700\u8981\u4e3a\u5bf9\u5e94\u7684\u670d\u52a1\u6307\u5b9a\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\uff0c\u76f4\u63a5\u4f7f\u7528\u6ce8\u89e3\u5373\u53ef\uff1a<\/p>\n\n\n\n
    @Configuration\r\n@LoadBalancerClient(value = \"userservice\",      \/\/\u6307\u5b9a\u4e3a userservice \u670d\u52a1\uff0c\u53ea\u8981\u662f\u8c03\u7528\u6b64\u670d\u52a1\u90fd\u4f1a\u4f7f\u7528\u6211\u4eec\u6307\u5b9a\u7684\u7b56\u7565\r\n                    configuration = LoadBalancerConfig.class)   \/\/\u6307\u5b9a\u6211\u4eec\u521a\u521a\u5b9a\u4e49\u597d\u7684\u914d\u7f6e\u7c7b\r\npublic class BeanConfig {\r\n    @Bean\r\n    @LoadBalanced\r\n    RestTemplate template(){\r\n        return new RestTemplate();\r\n    }\r\n}<\/code><\/pre>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728\u4e4b\u524d\u6211\u4eec\u8fdb\u884c\u670d\u52a1\u9ad8\u53ef\u7528\u65f6\uff0c\u63d0\u5230\u8fc7\u8d1f\u8f7d\u5747\u8861\u7684\u6982\u5ff5\uff0c\u5373\u901a\u8fc7\u5c06\u4e00\u4e2a\u670d\u52a1\u8fdb\u884c\u591a\u4e2a\u90e8\u7f72\uff0c\u5e73\u644a\u670d\u52a1\u538b\u529b\uff0c\u5b9e\u73b0\u8d1f\u8f7d\u7684\u5747\u8861\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-1422","post","type-post","status-publish","format-standard","hentry","category-6"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1422"}],"collection":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/comments?post=1422"}],"version-history":[{"count":1,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1422\/revisions"}],"predecessor-version":[{"id":1424,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1422\/revisions\/1424"}],"wp:attachment":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/media?parent=1422"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/categories?post=1422"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/tags?post=1422"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}