{"id":10006546,"date":"2022-09-20T13:40:40","date_gmt":"2022-09-20T05:40:40","guid":{"rendered":"https:\/\/ityet.com\/?p=10006546"},"modified":"2022-09-20T13:40:40","modified_gmt":"2022-09-20T05:40:40","slug":"spring-boot-reactor-%e6%95%b4%e5%90%88-resilience4j","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006546","title":{"rendered":"Spring Boot Reactor \u6574\u5408 Resilience4j"},"content":{"rendered":"

Reactor \u6574\u5408 Resilence4j<\/p>\n

1 \u5f15\u5165 pom \u5305<\/h2>\n
<dependency>\n    <groupId>io.github.resilience4j<\/groupId>\n    <artifactId>resilience4j-all<\/artifactId>\n<\/dependency>\n<dependency>\n    <groupId>io.github.resilience4j<\/groupId>\n    <artifactId>resilience4j-spring-boot2<\/artifactId>\n<\/dependency><\/code><\/pre>\n
2 \u914d\u7f6e\u8bf4\u660e<\/h2>\n
2.1 \u9650\u6d41 ratelimiter<\/h3>\n
\u4e24\u4e2a\u9650\u6d41\u914d\u7f6e\uff1abackendA 1s \u4e2d\u6700\u591a\u5141\u8bb8 10 \u6b21\u8bf7\u6c42\uff1b<\/p>\n
backendB \u6bcf 500ms \u6700\u591a\u5141\u8bb8 6 \u6b21\u8bf7\u6c42\u3002<\/p>\n
resilience4j.ratelimiter:\n  instances:\n    backendA:\n      limitForPeriod: 10\n      limitRefreshPeriod: 1s\n      timeoutDuration: 10ms\n      registerHealthIndicator: true\n      eventConsumerBufferSize: 100\n    backendB:\n      limitForPeriod: 6\n      limitRefreshPeriod: 500ms\n      timeoutDuration: 3s<\/code><\/pre>\n\n\n\n\n\n\n\n
\u914d\u7f6e\u5c5e\u6027<\/th>\n\u9ed8\u8ba4\u503c<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
timeoutDuration<\/td>\n5\u3010s\u3011<\/td>\n\u4e00\u4e2a\u7ebf\u7a0b\u7b49\u5f85\u8bb8\u53ef\u7684\u9ed8\u8ba4\u7b49\u5f85\u65f6\u95f4<\/td>\n<\/tr>\n
limitRefreshPeriod<\/td>\n500\u3010ns\u3011<\/td>\n\u9650\u5236\u5237\u65b0\u7684\u5468\u671f\u3002\u5728\u6bcf\u4e2a\u5468\u671f\u4e4b\u540e\uff0c\u901f\u7387\u9650\u5236\u5668\u5c06\u5176\u6743\u9650\u8ba1\u6570\u8bbe\u7f6e\u56de limitForPeriod \u503c<\/td>\n<\/tr>\n
limitForPeriod<\/td>\n50<\/td>\n\u4e00\u4e2a limitRefreshPeriod \uff08\u5468\u671f\uff09\u5141\u8bb8\u8bbf\u95ee\u7684\u6570\u91cf\uff08\u8bb8\u53ef\u6570\u91cf\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
2.2 \u91cd\u8bd5 retry<\/h3>\n
\u6ce8\u610f\u6307\u5b9a\u9700\u8981\u91cd\u8bd5\u7684\u5f02\u5e38\uff0c\u4e0d\u662f\u6240\u6709\u7684\u5f02\u5e38\u91cd\u8bd5\u90fd\u6709\u6548\u3002\u6bd4\u5982 DB \u76f8\u5173\u6821\u9a8c\u5f02\u5e38\uff0c\u5982\u552f\u4e00\u7ea6\u675f\u7b49\uff0c\u91cd\u8bd5\u4e5f\u4e0d\u4f1a\u6210\u529f\u7684\u3002<\/p>\n
\u91cd\u8bd5\u914d\u7f6e\uff1a<\/p>\n
resilience4j.retry:\n  instances:\n    backendA:\n      maxAttempts: 3\n      waitDuration: 10s\n      enableExponentialBackoff: true\n      exponentialBackoffMultiplier: 2\n      retryExceptions:\n        - org.springframework.web.client.HttpServerErrorException\n        - java.io.IOException\n\n    backendB:\n      maxAttempts: 3\n      waitDuration: 10s\n      retryExceptions:\n        - org.springframework.web.client.HttpServerErrorException\n        - java.io.IOException<\/code><\/pre>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u914d\u7f6e\u5c5e\u6027<\/th>\n\u9ed8\u8ba4\u503c<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
maxAttempts<\/td>\n3<\/td>\n\u6700\u5927\u91cd\u8bd5\u6b21\u6570\uff08\u5305\u62ec\u7b2c\u4e00\u6b21\uff09<\/td>\n<\/tr>\n
waitDuration<\/td>\n500\u3010ms\u3011<\/td>\n\u4e24\u6b21\u91cd\u8bd5\u4e4b\u95f4\u7684\u7b49\u5f85\u95f4\u9694<\/td>\n<\/tr>\n
intervalFunction<\/td>\nnumOfAttempts -> waitDuration<\/td>\n\u4fee\u6539\u5931\u8d25\u540e\u7b49\u5f85\u95f4\u9694\u7684\u51fd\u6570\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u7b49\u5f85\u65f6\u95f4\u662f\u4e2a\u5e38\u91cf\u3002<\/td>\n<\/tr>\n
retryOnResultPredicate<\/td>\nresult->false<\/td>\n\u914d\u7f6e\u4e00\u4e2a\u5224\u65ad\u7ed3\u679c\u662f\u5426\u5e94\u8be5\u91cd\u8bd5\u7684 predicate \u51fd\u6570\u3002\u5982\u679c\u7ed3\u679c\u5e94\u8be5\u91cd\u8bd5\uff0cPredicate \u5fc5\u987b\u8fd4\u56de true\uff0c\u5426\u5219\u5b83\u5fc5\u987b\u8fd4\u56de false\u3002<\/td>\n<\/tr>\n
retryExceptionPredicate<\/td>\nthrowable -> true<\/td>\n\u548c retryOnResultPredicate \u7c7b\u4f3c\uff0c\u5982\u679c\u8981\u91cd\u8bd5\uff0cPredicate \u5fc5\u987b\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/td>\n<\/tr>\n
retryExceptions<\/td>\n\u7a7a<\/td>\n\u9700\u8981\u91cd\u8bd5\u7684\u5f02\u5e38\u7c7b\u578b\u5217\u8868<\/td>\n<\/tr>\n
ignoreExceptions<\/td>\n\u7a7a<\/td>\n\u4e0d\u9700\u8981\u91cd\u8bd5\u7684\u5f02\u5e38\u7c7b\u578b\u5217\u8868<\/td>\n<\/tr>\n
failAfterMaxAttempts<\/td>\nfalse<\/td>\n\u5f53\u91cd\u8bd5\u8fbe\u5230\u914d\u7f6e\u7684 maxAttempts \u5e76\u4e14\u7ed3\u679c\u4ecd\u672a\u901a\u8fc7 retryOnResultPredicate \u65f6\u542f\u7528\u6216\u7981\u7528\u629b\u51fa MaxRetriesExceededException \u7684\u5e03\u5c14\u503c<\/td>\n<\/tr>\n
intervalBiFunction<\/td>\n(numOfAttempts, Either<throwable, result>) -> waitDuration<\/td>\n\u6839\u636e maxAttempts \u548c\u7ed3\u679c\u6216\u5f02\u5e38\u4fee\u6539\u5931\u8d25\u540e\u7b49\u5f85\u95f4\u9694\u65f6\u95f4\u7684\u51fd\u6570\u3002\u4e0e intervalFunction \u4e00\u8d77\u4f7f\u7528\u65f6\u4f1a\u629b\u51fa IllegalStateException\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
2.3 \u8d85\u65f6 TimeLimiter<\/h3>\n
\u8d85\u65f6\u914d\u7f6e\uff1a<\/p>\n
resilience4j.timelimiter:\n  instances:\n    backendA:\n      timeoutDuration: 2s\n      cancelRunningFuture: true\n    backendB:\n      timeoutDuration: 1s\n      cancelRunningFuture: false<\/code><\/pre>\n
\u8d85\u65f6\u914d\u7f6e\u6bd4\u8f83\u7b80\u5355\uff0c\u4e3b\u8981\u662f\u914d\u7f6e timeoutDuration \u4e5f\u5c31\u662f\u8d85\u65f6\u7684\u65f6\u95f4\u3002<\/p>\n
cancelRunningFuture \u7684\u610f\u601d\u662f\uff1a\u662f\u5426\u5e94\u8be5\u5728\u8fd0\u884c\u7684 Future \u8c03\u7528 cancel \u53bb\u6389\u8c03\u7528\u3002<\/p>\n
2.4 \u65ad\u8def\u5668 circuitbreaker<\/h3>\n
\"\"<\/p>\n
\u65ad\u8def\u5668\u6709\u51e0\u79cd\u72b6\u6001\uff1a\u5173\u95ed\u3001\u6253\u5f00\u3001\u534a\u5f00\u3002\u6ce8\u610f\uff1a\u6253\u5f00\uff0c\u610f\u5473\u7740\u4e0d\u80fd\u8bbf\u95ee\uff0c\u4f1a\u8fc5\u901f\u5931\u8d25\u3002<\/p>\n
CircuitBreaker \u4f7f\u7528\u6ed1\u52a8\u7a97\u53e3<\/strong>\u6765\u5b58\u50a8\u548c\u6c47\u603b\u8c03\u7528\u7ed3\u679c\u3002\u60a8\u53ef\u4ee5\u5728\u57fa\u4e8e\u8ba1\u6570\u7684\u6ed1\u52a8\u7a97\u53e3\u548c\u57fa\u4e8e\u65f6\u95f4\u7684\u6ed1\u52a8\u7a97\u53e3\u4e4b\u95f4\u8fdb\u884c\u9009\u62e9\u3002\u57fa\u4e8e\u8ba1\u6570\u7684\u6ed1\u52a8\u7a97\u53e3\u805a\u5408\u6700\u540e N \u6b21\u8c03\u7528\u7684\u7ed3\u679c\u3002\u57fa\u4e8e\u65f6\u95f4\u7684\u6ed1\u52a8\u7a97\u53e3\u805a\u5408\u4e86\u6700\u540e N \u79d2\u7684\u8c03\u7528\u7ed3\u679c\u3002<\/p>\n
\u65ad\u8def\u5668\u914d\u7f6e\uff1a<\/p>\n
resilience4j.circuitbreaker:\n  instances:\n    backendA:\n      \/\/ \u5065\u5eb7\u6307\u6807\u53c2\u6570\uff0c\u975e\u65ad\u8def\u5668\u5c5e\u6027\n      registerHealthIndicator: true\n      slidingWindowSize: 100<\/code><\/pre>\n\n\n\n\n\n\n\n\n\n\n
\u914d\u7f6e\u5c5e\u6027<\/th>\n\u9ed8\u8ba4\u503c<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
slidingWindowSize<\/td>\n100<\/td>\n\u8bb0\u5f55\u65ad\u8def\u5668\u5173\u95ed\u72b6\u6001\u4e0b\uff08\u53ef\u4ee5\u8bbf\u95ee\u7684\u60c5\u51b5\u4e0b\uff09\u7684\u8c03\u7528\u7684\u6ed1\u52a8\u7a97\u53e3\u5927\u5c0f<\/td>\n<\/tr>\n
failureRateThreshold<\/td>\n50\uff08\u767e\u5206\u6bd4\uff09<\/td>\n\u5f53\u5931\u8d25\u6bd4\u4f8b\u8d85\u8fc7 failureRateThreshold \u7684\u65f6\u5019\uff0c\u65ad\u8def\u5668\u4f1a\u6253\u5f00\uff0c\u5e76\u5f00\u59cb\u77ed\u8def\u547c\u53eb<\/td>\n<\/tr>\n
slowCallDurationThreshold<\/td>\n60000\u3010ms\u3011<\/td>\n\u8bf7\u6c42\u88ab\u5b9a\u4e49\u4e3a\u6162\u8bf7\u6c42\u7684\u9608\u503c<\/td>\n<\/tr>\n
slowCallRateThreshold<\/td>\n100\uff08\u767e\u5206\u6bd4\uff09<\/td>\n\u6162\u8bf7\u6c42\u767e\u5206\u6bd4\u5927\u4e8e\u7b49\u4e8e\u8be5\u503c\u65f6\uff0c\u6253\u5f00\u65ad\u8def\u5668\u5f00\u5173<\/td>\n<\/tr>\n
permittedNumberOfCalls<\/td>\n10<\/td>\n\u534a\u5f00<\/strong>\u72b6\u6001\u4e0b\u5141\u8bb8\u901a\u8fc7\u7684\u8bf7\u6c42\u6570<\/td>\n<\/tr>\n
maxWaitDurationInHalfOpenState<\/td>\n0<\/td>\n\u914d\u7f6e\u6700\u5927\u7b49\u5f85\u6301\u7eed\u65f6\u95f4\uff0c\u8be5\u6301\u7eed\u65f6\u95f4\u63a7\u5236\u65ad\u8def\u5668\u5728\u5207\u6362\u5230\u6253\u5f00\u4e4b\u524d\u53ef\u4ee5\u4fdd\u6301\u5728\u534a\u5f00\u72b6\u6001\u7684\u6700\u957f\u65f6\u95f4\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u503c 0 \u8868\u793a\u65ad\u8def\u5668\u5c06\u5728 HalfOpen \u72b6\u6001\u4e0b\u65e0\u9650\u7b49\u5f85\uff0c\u76f4\u5230\u6240\u6709\u5141\u8bb8\u7684\u8c03\u7528\u90fd\u5df2\u5b8c\u6210\u3002<\/p>\n
2.5 \u58c1\u4ed3 bulkhead<\/h3>\n
resilience4j \u63d0\u4f9b\u4e86\u4e24\u79cd\u5b9e\u73b0\u58c1\u4ed3\u7684\u65b9\u6cd5\uff1a<\/p>\n