1

dd

2025-12-26 9652bbc4a506f46986e298735b27f281ebf06124

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

@@ -33,6 +33,8 @@
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import com.fasterxml.jackson.databind.ObjectMapper;

@Service
@@ -109,39 +111,57 @@
        }
    }

    private static String lastResult = null;
    private static long lastExecuteTime = 0;
    private static class CacheEntry {
        String result;
        long lastExecuteTime;
    }

    private static final Map<String, CacheEntry> cacheMap = new ConcurrentHashMap<>();
    private static final long MIN_INTERVAL_MS = 3000;
    private static final Object cacheLock = new Object();
    private static final Object globalLock = new Object();

    public static String doGet(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. 先检查该pid是否有缓存
        CacheEntry entry = cacheMap.get(pid);
        if (entry != null && (currentTime - entry.lastExecuteTime) < MIN_INTERVAL_MS) {
            return entry.result;
        }

        // 同步块内再次检查并执行
        synchronized (cacheLock) {
        // 2. 使用双重检查锁定更新缓存
        synchronized (getLockForPid(pid)) {
            currentTime = System.currentTimeMillis();
            if (lastResult != null && (currentTime - lastExecuteTime) < MIN_INTERVAL_MS) {
                return lastResult;
            entry = cacheMap.get(pid);

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

            // 执行POST请求
            // 3. 执行实际请求
            String newResult = doActualPost(pid);

            // 更新缓存
            lastResult = newResult;
            lastExecuteTime = System.currentTimeMillis();
            // 4. 更新该pid的缓存
            CacheEntry newEntry = new CacheEntry();
            newEntry.result = newResult;
            newEntry.lastExecuteTime = System.currentTimeMillis();
            cacheMap.put(pid, newEntry);

            return newResult;
        }
    }

    // 为每个pid提供独立的锁对象，避免不同pid间的阻塞
    private static final Map<String, Object> pidLocks = new ConcurrentHashMap<>();

    private static Object getLockForPid(String pid) {
        return pidLocks.computeIfAbsent(pid, k -> new Object());
    }


    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);
@@ -161,7 +181,8 @@
            }

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

@@ -174,9 +195,10 @@

        } catch (Exception e) {
            e.printStackTrace();
            // 返回缓存或错误信息
            if (lastResult != null) {
                return lastResult;
            // 如果请求失败，返回该pid的旧缓存（如果有）
            CacheEntry oldEntry = cacheMap.get(pid);
            if (oldEntry != null && oldEntry.result != null) {
                return oldEntry.result;
            }
            return "{\"error\":\"请求失败:" + e.getMessage() + "\"}";
        }