高性能接口实现方案

以下是基于SpringBoot+SpringCloudAlibaba的高性能接口实现方案，包含分布式限流、异步处理、缓存优化等核心模块：

<project>
<dependencies>
<!-- SpringCloud Alibaba -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

<!-- 高性能组件 -->
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-okhttp</artifactId>
</dependency>
<dependency>
<groupId>com.github.ben-manes.caffeine</groupId>
<artifactId>caffeine</artifactId>
</dependency>
</dependencies>
</project>

@Configuration
@EnableAsync
public class AsyncConfig implements AsyncConfigurer {
@Bean("asyncExecutor")
public Executor asyncExecutor() {
return new ThreadPoolTaskExecutor() {{
setCorePoolSize(32);
setMaxPoolSize(256);
setQueueCapacity(10000);
setThreadNamePrefix("Async-");
}};
}
}

@Configuration
public class SentinelConfig {
@PostConstruct
public void initRules() {
FlowRule rule = new FlowRule("highQpsApi")
.setCount(1000000) // 100万QPS
.setGrade(RuleConstant.FLOW_GRADE_QPS);
FlowRuleManager.loadRules(Collections.singletonList(rule));
}
}

@RestController
@RequestMapping("/api")
public class HighQpsController {

@SentinelResource(value = "highQpsApi", blockHandler = "handleBlock")
@GetMapping("/data")
public CompletableFuture<String> getData(@RequestParam String key) {
return CompletableFuture.supplyAsync(() -> {
// 1. 本地缓存检查
String cacheValue = localCache.getIfPresent(key);
if(cacheValue != null) return cacheValue;

// 2. 异步处理核心逻辑
return processRequest(key);
}, asyncExecutor);
}

private String processRequest(String key) {
// 业务逻辑处理...
}
}

代码说明：

1. 采用Sentinel实现分布式限流，支持动态规则调整
2. 使用CompletableFuture实现异步非阻塞处理
3. 配置高性能线程池处理并发请求
4. 集成Caffeine本地缓存减少IO压力
5. 通过Nacos实现服务发现和动态配置