| | |
| | | package com.ard.work.domain.cache; |
| | | |
| | | import com.ard.work.domain.dto.state.UavState; |
| | | |
| | | import java.util.concurrent.ConcurrentHashMap; |
| | | |
| | | /** |
| | |
| | | public class UavStateCache { |
| | | |
| | | // 使用 ConcurrentHashMap 来缓存无人机状态数据,key 是 boxSn(无人机序列号) |
| | | private static final ConcurrentHashMap<String, UavState> uavStateCache = new ConcurrentHashMap<>(); |
| | | private static final ConcurrentHashMap<String, UavState> cache = new ConcurrentHashMap<>(); |
| | | |
| | | // 存储无人机状态数据到缓存 |
| | | public static void putUavState(UavState uavState) { |
| | | uavStateCache.put(uavState.getBoxSn(), uavState); |
| | | } |
| | | public static void put(UavState uavState) {cache.put(uavState.getBoxSn(), uavState);} |
| | | |
| | | // 从缓存中获取无人机状态数据 |
| | | public static UavState getUavState(String boxSn) { |
| | | return uavStateCache.get(boxSn); |
| | | public static UavState get(String boxSn) { |
| | | return cache.get(boxSn); |
| | | } |
| | | |
| | | // 删除缓存中的无人机状态数据 |
| | | public static void removeUavState(String boxSn) { |
| | | uavStateCache.remove(boxSn); |
| | | public static void remove(String boxSn) { |
| | | cache.remove(boxSn); |
| | | } |
| | | |
| | | // 定时任务使用:判断状态是否变化,但不更新缓存 |
| | | public static boolean hasChanged(String boxSn, UavState newState) { |
| | | UavState oldState = cache.get(boxSn); |
| | | if (oldState == null) { |
| | | return true; // 没有缓存,算作变化 |
| | | } |
| | | return !oldState.equals(newState); // true = 有变化 |
| | | } |
| | | } |