缓存

src/main/java/com/viontech/storage/entity/Generator.java

 package com.viontech.storage.entity;
 
+import cn.hutool.cache.CacheUtil;
+import cn.hutool.cache.impl.TimedCache;
 import cn.hutool.core.collection.CollectionUtil;
 import cn.hutool.core.lang.Pair;
 import cn.hutool.core.util.XmlUtil;
@@ -21,6 +23,7 @@ import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
 
+import java.time.Duration;
 import java.util.*;
 import java.util.stream.Collectors;
 
@@ -35,7 +38,7 @@ import java.util.stream.Collectors;
 public class Generator {
     private static final String ROOT_ELEMENT_NAME = "StorageConfig";
     private static final String FILE_VERSION = "001-012-000-000";
-
+    private static final TimedCache<Long, Generator> CACHE = CacheUtil.newTimedCache(Duration.ofSeconds(5).toMillis());
     private final Document document = XmlUtil.createXml(ROOT_ELEMENT_NAME);
     /** 来自 StorageConfig, 对应 Solution */
     private final List<Context> contexts;
@@ -43,56 +46,69 @@ public class Generator {
     private final Map<Long, PicConfigVo> picConfigMap;
     /** key: captionSetId */
     private final Map<Long, List<CaptionVo>> captionSetMap;
+    private String config;
 
     public Generator(Long storageConfigId) {
-        StorageConfigService storageConfigService = SpringUtil.getBean(StorageConfigService.class);
-        PicConfigService picConfigService = SpringUtil.getBean(PicConfigService.class);
-        CaptionService captionService = SpringUtil.getBean(CaptionService.class);
-
-        StorageConfig storageConfig0 = storageConfigService.getById(storageConfigId);
-        this.contexts = StorageConfigVo.copy(storageConfig0).getContexts();
-        if (contexts == null || contexts.size() == 0) {
-            throw new RuntimeException("无法构建改配置");
-        }
+        Generator generator = CACHE.get(storageConfigId);
+        if (generator == null) {
+            StorageConfigService storageConfigService = SpringUtil.getBean(StorageConfigService.class);
+            PicConfigService picConfigService = SpringUtil.getBean(PicConfigService.class);
+            CaptionService captionService = SpringUtil.getBean(CaptionService.class);
+
+            StorageConfig storageConfig0 = storageConfigService.getById(storageConfigId);
+            this.contexts = StorageConfigVo.copy(storageConfig0).getContexts();
+            if (contexts == null || contexts.size() == 0) {
+                throw new RuntimeException("无法构建改配置");
+            }
 
-        List<Long> picConfigIds = contexts.stream().map(Context::getPicConfigId).collect(Collectors.toList());
+            List<Long> picConfigIds = contexts.stream().map(Context::getPicConfigId).collect(Collectors.toList());
 
-        List<PicConfig> picConfigs = picConfigService.listByIds(picConfigIds);
-        this.picConfigMap = new HashMap<>(picConfigs.size());
-        ArrayList<Long> captionSetIds = new ArrayList<>();
-        for (PicConfig item : picConfigs) {
-            PicConfigVo copy = PicConfigVo.copy(item);
-            picConfigMap.put(copy.getId(), copy);
-            captionSetIds.add(copy.getCaptionSetId());
-        }
+            List<PicConfig> picConfigs = picConfigService.listByIds(picConfigIds);
+            this.picConfigMap = new HashMap<>(picConfigs.size());
+            ArrayList<Long> captionSetIds = new ArrayList<>();
+            for (PicConfig item : picConfigs) {
+                PicConfigVo copy = PicConfigVo.copy(item);
+                picConfigMap.put(copy.getId(), copy);
+                captionSetIds.add(copy.getCaptionSetId());
+            }
 
-        List<Caption> captions = captionService.list(captionService.query().in("caption_set_id", captionSetIds).getWrapper());
+            List<Caption> captions = captionService.list(captionService.query().in("caption_set_id", captionSetIds).getWrapper());
 
-        this.captionSetMap = captions.stream().map(CaptionVo::copy).collect(Collectors.groupingBy(CaptionVo::getCaptionSetId, Collectors.toList()));
+            this.captionSetMap = captions.stream().map(CaptionVo::copy).collect(Collectors.groupingBy(CaptionVo::getCaptionSetId, Collectors.toList()));
+            CACHE.put(storageConfigId, this);
+        } else {
+            this.contexts = generator.contexts;
+            this.picConfigMap = generator.picConfigMap;
+            this.captionSetMap = generator.captionSetMap;
+            this.config = generator.config;
+        }
     }
 
     public String build() {
-        // 基本上算是固定写法
-        Node rootNode = document.getFirstChild();
-        rootNode.appendChild(createTextNode("FileVersion", FILE_VERSION));
-        Element standard = document.createElement("Standard");
-        rootNode.appendChild(standard);
-        standard.appendChild(createTextNode("SolutionNum", String.valueOf(contexts.size())));
-        Element switchPathConfig = document.createElement("SwitchPathConfig");
-        switchPathConfig.appendChild(createTextNode("Flag", "1"));
-        switchPathConfig.appendChild(createTextNode("RootPaths", "/VionData/RecordData/viondata0;/VionData/RecordData/viondata1;/VionData/RecordData/viondata2;/VionData/RecordData/viondata3;"));
-        switchPathConfig.appendChild(createTextNode("VolumeThreshold", "2048"));
-        switchPathConfig.appendChild(createTextNode("CountThreshold", "64"));
-        standard.appendChild(switchPathConfig);
-
-        // 开始组装 Solution
-        for (Context context : contexts) {
-            Node solution = buildSolution(context);
-            if (solution != null) {
-                standard.appendChild(solution);
+        if (this.config == null) {
+            // 基本上算是固定写法
+            Node rootNode = document.getFirstChild();
+            rootNode.appendChild(createTextNode("FileVersion", FILE_VERSION));
+            Element standard = document.createElement("Standard");
+            rootNode.appendChild(standard);
+            standard.appendChild(createTextNode("SolutionNum", String.valueOf(contexts.size())));
+            Element switchPathConfig = document.createElement("SwitchPathConfig");
+            switchPathConfig.appendChild(createTextNode("Flag", "1"));
+            switchPathConfig.appendChild(createTextNode("RootPaths", "/VionData/RecordData/viondata0;/VionData/RecordData/viondata1;/VionData/RecordData/viondata2;/VionData/RecordData/viondata3;"));
+            switchPathConfig.appendChild(createTextNode("VolumeThreshold", "2048"));
+            switchPathConfig.appendChild(createTextNode("CountThreshold", "64"));
+            standard.appendChild(switchPathConfig);
+
+            // 开始组装 Solution
+            for (Context context : contexts) {
+                Node solution = buildSolution(context);
+                if (solution != null) {
+                    standard.appendChild(solution);
+                }
             }
+            this.config = XmlUtil.toStr(document, "GBK", false);
         }
-        return XmlUtil.toStr(document, "GBK", false);
+        return this.config;
     }