1.查询所有摄像头 selectAll 增加缓存

pom.xml

@@ -68,6 +68,19 @@
             <artifactId>javacv-platform</artifactId>
             <version>1.5.7</version>
         </dependency>
+        <!--缓存-->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-cache</artifactId>
+            <version>2.4.4</version>
+        </dependency>
+
+        <dependency>
+            <groupId>net.sf.ehcache</groupId>
+            <artifactId>ehcache</artifactId>
+            <version>2.10.6</version>
+        </dependency>
+
 
         <!--<dependency>
             <groupId>org.bytedeco</groupId>

src/main/java/com/hisense/monitormanage/MonitorManageApplication.java

@@ -3,11 +3,13 @@ package com.hisense.monitormanage;
 import org.mybatis.spring.annotation.MapperScan;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication
 @MapperScan("com.hisense.monitormanage.mapper")
-
+@EnableCaching
 @EnableScheduling
 public class MonitorManageApplication {
 

src/main/java/com/hisense/monitormanage/config/CachingConfig.java

@@ -0,0 +1,33 @@
+package com.hisense.monitormanage.config;
+
+import net.sf.ehcache.CacheManager;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.cache.ehcache.EhCacheCacheManager;
+import org.springframework.cache.ehcache.EhCacheManagerFactoryBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
+
+
+/**
+ * @author admin
+ * @version 1.0.0
+ * @ClassName CachingConfig.java
+ * @Description cache配置
+ * @createTime 2022年05月12日 09:45:00
+ */
+@Configuration
+@EnableCaching
+public class CachingConfig {
+    @Bean
+    public EhCacheCacheManager cacheManager(CacheManager cm) {
+        return new EhCacheCacheManager(cm);
+    }
+
+    @Bean
+    public EhCacheManagerFactoryBean ehcache() {
+        EhCacheManagerFactoryBean cacheManagerFactoryBean = new EhCacheManagerFactoryBean();
+        cacheManagerFactoryBean.setConfigLocation(new ClassPathResource("ehcache.xml"));
+        return cacheManagerFactoryBean;
+    }
+}

src/main/java/com/hisense/monitormanage/controller/Controller.java

@@ -53,6 +53,9 @@ public class Controller {
     @Autowired
     private RoadDataService roadDataService;
 
+    @Autowired
+    private CameraChannelService cameraChannelService;
+
     @RequestMapping("all")
     public Object all(){
         List<Project> projects = projectMapper.selectList(null);
@@ -105,19 +108,19 @@ public class Controller {
 
     /**
      * 查询所有摄像头
-     * @param cameraChannel
+     * @param
      * @return
      */
     @RequestMapping("selectAll")
-    public Result selectAll(CameraChannel cameraChannel,Integer page,Integer pageSize){
+    public Result selectAll(){
 
-        List<CameraChannelDto> list = cameraChannelMapper.selectAll(cameraChannel,page,pageSize);
+        //System.out.println("selectAll start->"+System.currentTimeMillis());
-
+        String listStr = cameraChannelService.selectAll();
-        Result success = Result.success(list);
+        //System.out.println("selectAll end->"+System.currentTimeMillis());
+        Result success = Result.success(listStr);
 
         return success;
 
-
     }
 
     /**
@@ -378,7 +381,7 @@ public class Controller {
             @RequestParam(value="start") String start,
             @RequestParam(value = "end") String end
     ){
-        System.out.println("listTrailSanitationByPoints......");
+//        System.out.println("listTrailSanitationByPoints......");
         List<TrailSanitation> list = trailSanitationService.listSedimentTrailByPoints(longitude,latitude,raidus,start,end);
         return Result.success(list);
     }

src/main/java/com/hisense/monitormanage/mapper/CameraChannelMapper.java

@@ -13,7 +13,7 @@ import java.util.List;
 
 public interface CameraChannelMapper extends BaseMapper<CameraChannel> {
 
-    List<CameraChannelDto> selectAll(CameraChannel cameraChannel,@Param("page") Integer page,@Param("pageSize") Integer pageSize);
+    List<CameraChannelDto> selectAll();
 
     @Select("select cc.*,cp.pic_url from t_camera_channel cc LEFT JOIN t_channel_picture cp ON cc.channel_code=cp.channel_code where cc.channel_id = #{channelId}")
     List<CameraChannelDto1> selectByChannelId(@Param("channelId") String channelId);

src/main/java/com/hisense/monitormanage/service/CameraChannelService.java

@@ -0,0 +1,45 @@
+package com.hisense.monitormanage.service;
+
+import com.alibaba.fastjson.JSONObject;
+import com.hisense.monitormanage.dto.CameraChannelDto;
+import com.hisense.monitormanage.entity.CameraChannel;
+import com.hisense.monitormanage.entity.Result;
+import com.hisense.monitormanage.mapper.CameraChannelMapper;
+import com.hisense.monitormanage.utils.EhcacheUtil;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cache.Cache;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.cache.ehcache.EhCacheCacheManager;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import java.util.List;
+
+/**
+ * @author admin
+ * @version 1.0.0
+ * @ClassName CameraChannelService.java
+ * @Description TODO
+ * @createTime 2022年05月12日 09:19:00
+ */
+@Service
+public class CameraChannelService {
+    @Autowired
+    private CameraChannelMapper cameraChannelMapper;
+
+    @Autowired
+    private EhCacheCacheManager ehCacheCacheManager;
+
+    //查询所有摄像头
+    //@Cacheable(value = "fillIn")
+    public String selectAll(){
+        String list = (String)EhcacheUtil.getInstance().get("fillIn", "allCameraList");
+        if(StringUtils.isEmpty(list)){
+            List<CameraChannelDto> cameraChannelDtos =  cameraChannelMapper.selectAll();
+            list = JSONObject.toJSONString(cameraChannelDtos);
+            EhcacheUtil.getInstance().put("fillIn", "allCameraList",list);
+        }
+        return list;
+    }
+
+}

src/main/java/com/hisense/monitormanage/utils/EhcacheUtil.java

@@ -0,0 +1,52 @@
+package com.hisense.monitormanage.utils;
+
+import net.sf.ehcache.CacheManager;
+import java.net.URL;
+import net.sf.ehcache.Cache;
+import net.sf.ehcache.Element;
+
+/**
+ * @author admin
+ * @version 1.0.0
+ * @ClassName EhcacheUtil.java
+ * @Description TODO
+ * @createTime 2022年05月12日 10:20:00
+ */
+public class EhcacheUtil {
+    private static final String path = "/ehcache.xml";
+    private URL url;
+    private CacheManager manager;
+    private static EhcacheUtil ehCache;
+    private EhcacheUtil(String path) {
+        url = getClass().getResource(path);
+        manager = CacheManager.create(url);
+    }
+
+public static EhcacheUtil getInstance() {
+    if (ehCache== null) {
+    ehCache= new EhcacheUtil(path);
+    }
+    return ehCache;
+    }
+
+    public void put(String cacheName, String key, Object value) {
+    Cache cache = manager.getCache(cacheName);
+    Element element = new Element(key, value);
+    cache.put(element);
+    }
+
+public Object get(String cacheName, String key) {
+    Cache cache = manager.getCache(cacheName);
+    Element element = cache.get(key);
+    return element == null ? null : element.getObjectValue();
+    }
+
+    public Cache get(String cacheName) {
+    return manager.getCache(cacheName);
+        }
+
+public void remove(String cacheName, String key) {
+    Cache cache = manager.getCache(cacheName);
+    cache.remove(key);
+    }
+}

src/main/resources/ehcache.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ehcache updateCheck="false" name="defaultCache">
+    <!-- 磁盘缓存位置 -->
+    <diskStore path="java.io.tmpdir/ehcache"/>
+    <!--
+            maxEntriesLocalHeap:堆内存中最大缓存对象数
+            eternal:对象是否永久有效，一但设置了，timeout将不起作用
+            overflowToDisk:当缓存达到maxElementsInMemory值是,是否允许溢出到磁盘
+            timeToIdleSeconds:当缓存闲置n秒后销毁
+            timeToLiveSeconds:当缓存存活n秒后销毁
+            maxEntriesLocalDisk:硬盘最大缓存个数
+            diskPersistent:磁盘缓存在JVM重新启动时是否保持
+         -->
+    <!-- 默认缓存 -->
+    <defaultCache
+            maxEntriesLocalHeap="10000"
+            eternal="false"
+            timeToIdleSeconds="600"
+            timeToLiveSeconds="600"
+            maxEntriesLocalDisk="10000000"
+            diskExpiryThreadIntervalSeconds="120"
+            memoryStoreEvictionPolicy="LRU"/>
+
+    <!-- fill-in缓存 -->
+    <cache name="fillIn"
+           maxElementsInMemory="10000"
+           eternal="false"
+           timeToIdleSeconds="600"
+           timeToLiveSeconds="600"
+           overflowToDisk="false"
+           memoryStoreEvictionPolicy="LRU"/>
+
+</ehcache>

src/main/resources/mapper/CameraChannelMapper.xml

@@ -12,9 +12,9 @@
     <select id="selectAll" resultType="com.hisense.monitormanage.dto.CameraChannelDto">
         select c.* from t_camera_channel c
         where (c.gps_x NOT IN('0.0','0','','-1000.0') OR c.gps_y NOT IN('0.0','0','','-1000.0'))
-          AND c.status != 0  order by channel_id desc
+          AND c.status != 0
-          <bind name="page" value="(page-1)*pageSize"/>
+<!--          <bind name="page" value="(page-1)*pageSize"/>-->
-        limit #{page},#{pageSize}
+<!--        limit #{page},#{pageSize}-->
     </select>
 
 </mapper>