【日更】TRAE SOLO 移动端上线！我们请你喝星巴克的思考

┌─────────────────────────────────────────┐
│              请求层 (Request)              │
├─────────────────────────────────────────┤
│              处理层 (Process)              │
├─────────────────────────────────────────┤
│              存储层 (Storage)              │
└─────────────────────────────────────────┘

/**
 * 核心处理器
 * 实现异步处理和缓存策略
 */
public class TopicProcessor {
    
    private final ExecutorService executor;
    private final CacheManager cacheManager;
    private final CircuitBreaker circuitBreaker;
    
    public TopicProcessor() {
        this.executor = Executors.newFixedThreadPool(
            Runtime.getRuntime().availableProcessors() * 2
        );
        this.cacheManager = new CacheManager();
        this.circuitBreaker = new CircuitBreaker();
    }
    
    /**
     * 处理请求
     * @param request 请求对象
     * @return 处理结果
     */
    public CompletableFuture processAsync(Request request) {
        return CompletableFuture.supplyAsync(() -> {
            // 检查熔断器状态
            if (circuitBreaker.isOpen()) {
                throw new ServiceUnavailableException("服务暂时不可用");
            }
            
            try {
                // 查询缓存
                String cacheKey = generateCacheKey(request);
                Result cached = cacheManager.get(cacheKey);
                if (cached != null) {
                    return cached;
                }
                
                // 执行业务逻辑
                Result result = doProcess(request);
                
                // 更新缓存
                cacheManager.put(cacheKey, result, Duration.ofMinutes(30));
                
                // 重置熔断器
                circuitBreaker.reset();
                
                return result;
            } catch (Exception e) {
                // 记录失败
                circuitBreaker.recordFailure();
                throw new ProcessingException("处理失败", e);
            }
        }, executor);
    }
    
    private Result doProcess(Request request) {
        // 实际业务逻辑
        return new Result("success", request.getData());
    }
    
    private String generateCacheKey(Request request) {
        return String.format("%s:%s:%s", 
            request.getType(), 
            request.getId(),
            request.getTimestamp()
        );
    }
}

// ❌ 错误配置
ExecutorService executor = Executors.newCachedThreadPool();
// 问题：线程数量无上限，可能导致 OOM

// ✅ 正确配置
ExecutorService executor = new ThreadPoolExecutor(
    8,                              // 核心线程数
    16,                             // 最大线程数
    60L, TimeUnit.SECONDS,          // 空闲线程存活时间
    new LinkedBlockingQueue<>(100), // 任务队列
    new ThreadPoolExecutor.CallerRunsPolicy() // 拒绝策略
);

// ❌ 错误示例
public Result getFromCache(String key) {
    Result result = cache.get(key);
    if (result == null) {
        // 缓存未命中，直接查询数据库
        result = db.query(key);
        cache.put(key, result, Duration.ofMinutes(30));
    }
    return result;
}

// ✅ 正确示例（随机过期时间）
public Result getFromCache(String key) {
    Result result = cache.get(key);
    if (result == null) {
        result = db.query(key);
        // 添加随机过期时间，防止缓存雪崩
        int randomMinutes = 30 + new Random().nextInt(10);
        cache.put(key, result, Duration.ofMinutes(randomMinutes));
    }
    return result;
}