@Cacheable(value = "goods", key = "#goodsId")
public Goods getGoods(Integer goodsId) {
    // 查詢數(shù)據(jù)庫
}

var requestTimes = 0; 
var lastRequestTime = 0;
function requestSecKill() {
    var now = new Date();
    if (now - lastRequestTime < 1000 && requestTimes > 5) {
        alert('請求過于頻繁,請稍后再試!');
        return;
    }
    lastRequestTime = now;
    requestTimes++;
    // 發(fā)送秒殺請求
}

BlockingQueue<Runnable> queue = new ArrayBlockingQueue<>(1000);
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public void addTask(Runnable task) {
    boolean offered = queue.offer(task);
    if (!offered) {
        // 隊列滿了,請求太多,返回限流提示
    }
}
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public void handleTasks() {
    Runnable task = queue.poll();
    if (task != null) {
        executor.execute(task);
    }
}

RateLimiter rateLimiter = RateLimiter.create(10); // 每秒不超過10個請求 
if (rateLimiter.tryAcquire()) {
    // 請求通過
} else {
   // 請求超過限流頻率
}

@Autowired
private GoodsRepository goodsRepository;
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public Goods getGoods(Integer goodsId) {
    // 讀取從庫
    return goodsRepository.read(goodsId); 
}
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public void reduceStock(Integer goodsId) {
    // 寫入主庫
    goodsRepository.write(goodsId);
}

@Cacheable(value = "goods", key = "#goodsId", expire = "#expireTime")
public Goods getGoods(Integer goodsId, Integer expireTime) {
    // 查詢數(shù)據(jù)庫
}
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// 調(diào)整失效時間
cacheManager.setCacheExpired(cacheName, expireTime); 

@Cacheable(value = "goods", key = "#goodsId + #version") 
public Goods getGoods(Integer goodsId, Integer version) {
    // 查詢數(shù)據(jù)庫,帶版本號校驗
}
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public void updateGoods(Integer goodsId, Integer version) {
    goods.setVersion(version + 1);
    // 更新數(shù)據(jù)庫  
}

$.get("/goods/" + goodsId + "?v=" + version, function(data) {
     // 處理返回結果
});