From 9652bbc4a506f46986e298735b27f281ebf06124 Mon Sep 17 00:00:00 2001
From: dd <gitluke@outlook.com>
Date: Fri, 26 Dec 2025 11:39:16 +0800
Subject: [PATCH] 1
---
src/main/java/com/nq/service/impl/PriceServicesImpl.java | 60 +++++++++++++++++++++++++++++++++++++++++-------------------
1 files changed, 41 insertions(+), 19 deletions(-)
diff --git a/src/main/java/com/nq/service/impl/PriceServicesImpl.java b/src/main/java/com/nq/service/impl/PriceServicesImpl.java
index b9dab10..9c3f47c 100644
--- a/src/main/java/com/nq/service/impl/PriceServicesImpl.java
+++ b/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() + "\"}";
}
--
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