优化

liusuyi

2026-05-30 f4f4fc53260eb67483dce406a963628273786a61

 ard-modules/ard-modules-work/src/main/java/com/ard/work/device/camera/service/PtzCacheManager.java

@@ -2,10 +2,11 @@

import com.ard.work.device.camera.domain.PtzParamDTO;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;

/**
 * ptz缓存管理器
@@ -13,36 +14,50 @@
 * @author 刘苏义
 * @date 2026-03-20
 */

@Component
public class PtzCacheManager {
    // Key: cameraId_chanNo (例如 "CAM001_1"), Value: 最新的 PTZ 数据对象
    // 使用 ConcurrentHashMap 保证多线程安全

    /** Key: cameraId_chanNo, Value: 最新PTZ数据(自带 updateTime) */
    private final ConcurrentHashMap<String, PtzParamDTO> ptzDataMap = new ConcurrentHashMap<>();
    
    // 记录最后更新时间，用于判断数据是否过期
    private final ConcurrentHashMap<String, Long> updateTimeMap = new ConcurrentHashMap<>();

    public void updatePtzData(String key, PtzParamDTO data) {
        if (data == null) return;
        data.setUpdateTime(System.currentTimeMillis());
        ptzDataMap.put(key, data);
        updateTimeMap.put(key, System.currentTimeMillis());
    }

    public PtzParamDTO getPtzData(String key) {
        return ptzDataMap.get(key);
    }
    
    // 获取所有有效数据快照
    /** 获取所有未过期数据快照 */
    public List<PtzParamDTO> getAllValidData(long timeoutMs) {
        long now = System.currentTimeMillis();
        return ptzDataMap.entrySet().stream()
            .filter(entry -> (now - updateTimeMap.get(entry.getKey())) < timeoutMs)
            .map(Map.Entry::getValue)
            .collect(Collectors.toList());
        Collection<PtzParamDTO> values = ptzDataMap.values();
        List<PtzParamDTO> result = new ArrayList<>(values.size());
        for (PtzParamDTO dto : values) {
            if (now - dto.getUpdateTime() < timeoutMs) {
                result.add(dto);
            }
        }
        return result;
    }
    
    public void removeData(String key) {
        ptzDataMap.remove(key);
        updateTimeMap.remove(key);
    }

    /** 清理过期数据,返回清理条数 */
    public int evictStale(long timeoutMs) {
        long now = System.currentTimeMillis();
        int[] count = {0};
        ptzDataMap.entrySet().removeIf(e -> {
            if (now - e.getValue().getUpdateTime() > timeoutMs) {
                count[0]++;
                return true;
            }
            return false;
        });
        return count[0];
    }
}