1

dd

2025-12-26 63769df44b9baf8339f6e0e151f4b6908386087c

 src/main/java/com/nq/service/impl/PriceServicesImpl.java

@@ -31,6 +31,8 @@
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import com.fasterxml.jackson.databind.ObjectMapper;

@Service
@@ -110,39 +112,65 @@
        }
    }

    private static String lastResult = null;
    private static long lastExecuteTime = 0;
    // 缓存条目类
    private static class CacheEntry {
        String result;
        long lastExecuteTime;

        CacheEntry(String result, long lastExecuteTime) {
            this.result = result;
            this.lastExecuteTime = lastExecuteTime;
        }
    }

    // 按pid存储缓存条目
    private static final Map<String, CacheEntry> cacheMap = new ConcurrentHashMap<>();

    // 按pid存储锁对象，实现细粒度锁
    private static final Map<String, Object> lockMap = new ConcurrentHashMap<>();

    private static final long MIN_INTERVAL_MS = 3000;
    private static final Object cacheLock = new Object();

    public static String doPost(String pid) {
        long currentTime = System.currentTimeMillis();

        // 第一次快速检查（不加锁）
        if (lastResult != null && (currentTime - lastExecuteTime) < MIN_INTERVAL_MS) {
            return lastResult;
        // 1. 快速检查缓存（无锁）
        CacheEntry cached = cacheMap.get(pid);
        if (cached != null && (currentTime - cached.lastExecuteTime) < MIN_INTERVAL_MS) {
            return cached.result;
        }

        // 同步块内再次检查并执行
        synchronized (cacheLock) {
        // 2. 获取该pid对应的锁对象
        Object pidLock = lockMap.computeIfAbsent(pid, k -> new Object());

        // 3. 同步块内再次检查
        synchronized (pidLock) {
            currentTime = System.currentTimeMillis();
            if (lastResult != null && (currentTime - lastExecuteTime) < MIN_INTERVAL_MS) {
                return lastResult;
            cached = cacheMap.get(pid);

            if (cached != null && (currentTime - cached.lastExecuteTime) < MIN_INTERVAL_MS) {
                return cached.result;
            }

            // 执行POST请求
            // 4. 执行POST请求
            String newResult = doActualPost(pid);

            // 更新缓存
            lastResult = newResult;
            lastExecuteTime = System.currentTimeMillis();
            // 5. 更新该pid的缓存
            if (newResult != null) {
                cacheMap.put(pid, new CacheEntry(newResult, System.currentTimeMillis()));
                return newResult;
            } else if (cached != null) {
                // 请求失败，返回旧缓存
                return cached.result;
            }

            return newResult;
            return "{\"error\":\"请求失败且无缓存数据\"}";
        }
    }

    private static String doActualPost(String pid) {
        String apiUrl = PropertiesUtil.getProperty("JS_IN_HTTP_URL") + "stock?key=" + PropertiesUtil.getProperty("JS_IN_KEY");
        String apiUrl = PropertiesUtil.getProperty("JS_IN_HTTP_URL") +
                "stock?key=" + PropertiesUtil.getProperty("JS_IN_KEY");

        try {
            URL url = new URL(apiUrl);
@@ -162,24 +190,22 @@
            }

            // 读取响应
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String inputLine;
            StringBuilder response = new StringBuilder();
            try (BufferedReader in = new BufferedReader(
                    new InputStreamReader(connection.getInputStream()))) {

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
                StringBuilder response = new StringBuilder();
                String inputLine;
                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }

                return response.toString();
            }
            in.close();

            return response.toString();

        } catch (Exception e) {
            e.printStackTrace();
            // 返回缓存或错误信息
            if (lastResult != null) {
                return lastResult;
            }
            return "{\"error\":\"请求失败:" + e.getMessage() + "\"}";
            // 不再直接返回旧缓存，由上层处理
            return null;
        }
    }