From a8a90fd2d5040e66cc66b3da122a7f82561ff6f6 Mon Sep 17 00:00:00 2001
From: 826220679@qq.com <826220679@qq.com>
Date: 星期六, 09 八月 2025 23:32:29 +0800
Subject: [PATCH] 优化了欢迎页面
---
src/dell_targets/Dell_BaseStation.java | 47 +++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/src/dell_targets/Dell_BaseStation.java b/src/dell_targets/Dell_BaseStation.java
index 67002d3..c58dd3b 100644
--- a/src/dell_targets/Dell_BaseStation.java
+++ b/src/dell_targets/Dell_BaseStation.java
@@ -4,18 +4,23 @@
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
+import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
public class Dell_BaseStation {
- static List<LocationBaseStation> baseStations;
+ public static List<LocationBaseStation> baseStations;
private static ConcurrentHashMap<String, LocationBaseStation> baseStationMap; // 以基站ID为键的映射
public static List<LocationBaseStation> getBaseStations() throws SQLException {
baseStations = new ArrayList<>();
baseStationMap = new ConcurrentHashMap<>(); // 修复：初始化映射
ResultSet rs = DBConnector.queryTableData("location_base_station");
-
+ if (rs == null) {
+ // 说明底层拿不到数据，直接抛异常或打印日志
+ throw new SQLException("DBConnector.queryTableData returned null, "
+ + "please check database connection & SQL.");
+ }
while (rs.next()) {
LocationBaseStation baseStation = new LocationBaseStation();
baseStation.setId((int) rs.getLong("id"));
@@ -133,5 +138,43 @@
public static LocationBaseStation getBaseStationById(String baseStationId) {
return baseStationMap.get(baseStationId); // O(1)复杂度直接获取
}
+
+ /**
+ * 获取所有在线状态(onlineStatus=1)的设备（高效内存操作）
+ * @return 不可修改的baseStationMap集合（避免外部修改缓存）
+ */
+ public static List<LocationBaseStation> getOnlineBaseStations() {
+ if (baseStationMap == null || baseStationMap.isEmpty()) {
+ return Collections.emptyList(); // 缓存为空时返回空集合
+ }
+
+ List<LocationBaseStation> BaseStation = new ArrayList<>();
+ for (LocationBaseStation base : baseStationMap.values()) {
+ if ("1".equals(base.getStatus())) { // 字符串比较避免NPE
+ BaseStation.add(base);
+ }
+ }
+ return Collections.unmodifiableList(BaseStation); // 返回不可变集合
+ }
+
+ /**
+ * 快速获取LocationTag对象的总数（使用内存缓存提高性能）
+ * @return LocationTag对象的总数
+ */
+ public static int getLocationBaseCount() {
+ if (baseStationMap == null) {
+ synchronized (LocationBaseStation.class) {
+ if (baseStationMap == null) {
+ try {
+ getBaseStations(); // 初始化缓存
+ } catch (SQLException e) {
+ e.printStackTrace();
+ return 0; // 初始化失败返回0
+ }
+ }
+ }
+ }
+ return baseStationMap.size();
+ }
}
\ No newline at end of file
--
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