Spring Cloud Alibaba 微服务架构实战【19章完整版】笔记汇总
没有实战过微服务架构的人，不能说真懂微服务。因为除了技术的实现，这其中还涉及了难以量化的业务拆分和组件化思想。这门课就带大家以电商工程为例，基于Spring Cloud / SpringCloud Alibaba ， 融合常用组件/中间件，进行微服务架构设计和开发，获取真正的企业级微服务解决方案。
链接：pan.baidu.com/s/1Ypi4RAch… 提取码：9gl1
失效+/❤：x923713
package com.imooc.ecommerce.block_handler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.fastjson.JSON;
import com.imooc.ecommerce.vo.CommonResponse;
import lombok.extern.slf4j.Slf4j;
/**
* <h1>自定义通用的限流处理逻辑</h1>
* */
@Slf4j
public class QinyiBlockHandler {
/**
* <h2>通用限流处理方法</h2>
* 这个方法必须是 static 的
* */
public static CommonResponse<String> qinyiHandleBlockException(BlockException exception) {
log.error("trigger qinyi block handler: [{}], [{}]",
JSON.toJSONString(exception.getRule()), exception.getRuleLimitApp());
return new CommonResponse<>(
-1,
"flow rule trigger block exception",
null
);
}
}
package com.imooc.ecommerce.controller;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.RuleConstant;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.fastjson.JSON;
import com.imooc.ecommerce.block_handler.QinyiBlockHandler;
import com.imooc.ecommerce.vo.CommonResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.PostConstruct;
import java.util.ArrayList;
import java.util.List;
/**
* <h1>流控规则硬编码的 Controller</h1>
* */
@Slf4j
@RestController
@RequestMapping("/code")
public class FlowRuleCodeController {
/**
* <h2>初始化流控规则</h2>
* */
@PostConstruct
public void init() {
// 流控规则集合
List<FlowRule> flowRules = new ArrayList<>();
// 创建流控规则
FlowRule flowRule = new FlowRule();
// 设置流控规则 QPS, 限流阈值类型 (QPS, 并发线程数)
flowRule.setGrade(RuleConstant.FLOW_GRADE_QPS);
// 流量控制手段
flowRule.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_DEFAULT);
// 设置受保护的资源
flowRule.setResource("flowRuleCode");
// 设置受保护的资源的阈值
flowRule.setCount(1);
flowRules.add(flowRule);
// 加载配置好的规则
FlowRuleManager.loadRules(flowRules);
}
/**
* <h2>采用硬编码限流规则的 Controller 方法</h2>
* */
@GetMapping("/flow-rule")
// @SentinelResource(value = "flowRuleCode")
// @SentinelResource(value = "flowRuleCode", blockHandler = "handleException")
@SentinelResource(
value = "flowRuleCode", blockHandler = "qinyiHandleBlockException",
blockHandlerClass = QinyiBlockHandler.class
)
public CommonResponse<String> flowRuleCode() {
log.info("request flowRuleCode");
return new CommonResponse<>(0, "", "imooc-qinyi-ecommerce");
}
/**
* <h2>当限流异常抛出时, 指定调用的方法</h2>
* 是一个兜底策略
* */
public CommonResponse<String> handleException(BlockException exception) {
log.error("has block exception: [{}]", JSON.toJSONString(exception.getRule()));
return new CommonResponse<>(
-1,
"flow rule exception",
exception.getClass().getCanonicalName()
);
}
}
package com.imooc.ecommerce.controller;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.fastjson.JSON;
import com.imooc.ecommerce.fallback_handler.QinyiFallbackHandler;
import com.imooc.ecommerce.vo.JwtToken;
import com.imooc.ecommerce.vo.UsernameAndPassword;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
/**
* <h1>Sentinel 提供容错降级的功能</h1>
* */
@SuppressWarnings("all")
@Slf4j
@RestController
@RequestMapping("/sentinel-fallback")
public class SentinelFallbackController {
/** 注入没有增强的 RestTemplate */
private final RestTemplate restTemplate;
public SentinelFallbackController(RestTemplate restTemplate) {
this.restTemplate = restTemplate;
}
@PostMapping("/get-token")
@SentinelResource(
value = "getTokenFromAuthorityService",
fallback = "getTokenFromAuthorityServiceFallback",
fallbackClass = { QinyiFallbackHandler.class }
)
public JwtToken getTokenFromAuthorityService(
@RequestBody UsernameAndPassword usernameAndPassword) {
String requestUrl =
"http://127.0.0.1:7000/ecommerce-authority-center/authority/token";
log.info("RestTemplate request url and body: [{}], [{}]",
requestUrl, JSON.toJSONString(usernameAndPassword));
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
return restTemplate.postForObject(
requestUrl,
new HttpEntity<>(JSON.toJSONString(usernameAndPassword), headers),
JwtToken.class
);
}
/**
* <h2>让 Sentinel 忽略一些异常</h2>
* */
@GetMapping("/ignore-exception")
@SentinelResource(
value = "ignoreException",
fallback = "ignoreExceptionFallback",
fallbackClass = { QinyiFallbackHandler.class },
exceptionsToIgnore = { NullPointerException.class }
)
public JwtToken ignoreException(@RequestParam Integer code) {
if (code % 2 == 0) {
throw new NullPointerException("yout input code is: " + code);
}
return new JwtToken("qinyi-imooc");
}
}
package com.imooc.ecommerce.controller;
import com.imooc.ecommerce.feign.SentinelFeignClient;
import com.imooc.ecommerce.vo.CommonResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
/**
* <h1>OpenFeign 集成 Sentinel 实现熔断降级</h1>
* */
@Slf4j
@RestController
@RequestMapping("/sentinel-feign")
public class SentinelFeignController {
private final SentinelFeignClient sentinelFeignClient;
public SentinelFeignController(SentinelFeignClient sentinelFeignClient) {
this.sentinelFeignClient = sentinelFeignClient;
}
/**
* <h2>通过 Feign 接口去获取结果</h2>
* */
@GetMapping("/result-by-feign")
public CommonResponse<String> getResultByFeign(@RequestParam Integer code) {
log.info("coming in get result by feign: [{}]", code);
return sentinelFeignClient.getResultByFeign(code);
}
}
链接：pan.baidu.com/s/1Ypi4RAch… 提取码：9gl1
失效+\\/❤：x923713
