1. 进一步封装 Redis pub/sub 的能力，简化编程难度

2. 数据字典的本地缓存刷新

src/main/java/cn/iocoder/dashboard/framework/redis/config/RedisConfig.java

@@ -1,6 +1,6 @@
 package cn.iocoder.dashboard.framework.redis.config;
 
-import cn.iocoder.dashboard.framework.redis.core.listener.AbstractMessageListener;
+import cn.iocoder.dashboard.framework.redis.core.pubsub.AbstractChannelMessageListener;
 import com.alibaba.fastjson.support.spring.GenericFastJsonRedisSerializer;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.context.annotation.Bean;
@@ -35,7 +35,7 @@ public class RedisConfig {
 
     @Bean
     public RedisMessageListenerContainer redisMessageListenerContainer(RedisConnectionFactory factory,
-                                                                       List<AbstractMessageListener<?>> listeners) {
+                                                                       List<AbstractChannelMessageListener<?>> listeners) {
         // 创建 RedisMessageListenerContainer 对象
         RedisMessageListenerContainer container = new RedisMessageListenerContainer();
         // 设置 RedisConnection 工厂。

src/main/java/cn/iocoder/dashboard/framework/redis/core/listener/AbstractMessageListener.java → src/main/java/cn/iocoder/dashboard/framework/redis/core/pubsub/AbstractChannelMessageListener.java

@@ -1,7 +1,8 @@
-package cn.iocoder.dashboard.framework.redis.core.listener;
+package cn.iocoder.dashboard.framework.redis.core.pubsub;
 
 import cn.hutool.core.util.ArrayUtil;
 import cn.iocoder.dashboard.util.json.JSONUtils;
+import lombok.SneakyThrows;
 import org.springframework.data.redis.connection.Message;
 import org.springframework.data.redis.connection.MessageListener;
 import sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl;
@@ -15,15 +16,21 @@ import java.lang.reflect.Type;
  *
  * @author 芋道源码
  */
-public abstract class AbstractMessageListener<T> implements MessageListener {
+public abstract class AbstractChannelMessageListener<T extends ChannelMessage> implements MessageListener {
 
     /**
      * 消息类型
      */
     private final Class<T> messageType;
+    /**
+     * Redis Channel
+     */
+    private final String channel;
 
-    protected AbstractMessageListener() {
+    @SneakyThrows
+    protected AbstractChannelMessageListener() {
         this.messageType = getMessageClass();
+        this.channel = messageType.newInstance().getChannel();
     }
 
     /**
@@ -31,7 +38,9 @@ public abstract class AbstractMessageListener<T> implements MessageListener {
      *
      * @return channel
      */
-    public abstract String getChannel();
+    public final String getChannel() {
+        return channel;
+    }
 
     @Override
     public final void onMessage(Message message, byte[] bytes) {
@@ -56,7 +65,7 @@ public abstract class AbstractMessageListener<T> implements MessageListener {
         Class<?> targetClass = getClass();
         while (targetClass.getSuperclass() != null) {
             // 如果不是 AbstractMessageListener 父类，继续向上查找
-            if (targetClass.getSuperclass() != AbstractMessageListener.class) {
+            if (targetClass.getSuperclass() != AbstractChannelMessageListener.class) {
                 targetClass = targetClass.getSuperclass();
                 continue;
             }

src/main/java/cn/iocoder/dashboard/framework/redis/core/pubsub/ChannelMessage.java

@@ -0,0 +1,18 @@
+package cn.iocoder.dashboard.framework.redis.core.pubsub;
+
+import com.alibaba.fastjson.annotation.JSONField;
+
+/**
+ * Redis Channel Message 接口
+ */
+public interface ChannelMessage {
+
+    /**
+     * 获得 Redis Channel
+     *
+     * @return Channel
+     */
+    @JSONField(serialize = false) // 必须序列化
+    String getChannel();
+
+}

src/main/java/cn/iocoder/dashboard/framework/redis/core/util/RedisMessageUtils.java

@@ -0,0 +1,24 @@
+package cn.iocoder.dashboard.framework.redis.core.util;
+
+import cn.iocoder.dashboard.framework.redis.core.pubsub.ChannelMessage;
+import cn.iocoder.dashboard.util.json.JSONUtils;
+import org.springframework.data.redis.core.RedisTemplate;
+
+/**
+ * Redis 消息工具类
+ *
+ * @author 芋道源码
+ */
+public class RedisMessageUtils {
+
+    /**
+     * 发送 Redis 消息，基于 Redis pub/sub 实现
+     *
+     * @param redisTemplate Redis 操作模板
+     * @param message 消息
+     */
+    public static <T extends ChannelMessage>  void sendChannelMessage(RedisTemplate<?, ?> redisTemplate, T message) {
+        redisTemplate.convertAndSend(message.getChannel(), JSONUtils.toJSONString(message));
+    }
+
+}

src/main/java/cn/iocoder/dashboard/modules/system/controller/auth/SysAuthController.java

@@ -63,7 +63,8 @@ public class SysAuthController {
         // 获得角色列表
         List<SysRoleDO> roleList = roleService.listRolesFromCache(getLoginUserRoleIds());
         // 获得菜单列表
-        List<SysMenuDO> menuList = permissionService.listRoleMenusFromCache(getLoginUserRoleIds(),
+        List<SysMenuDO> menuList = permissionService.listRoleMenusFromCache(
+                getLoginUserRoleIds(), // 注意，基于登陆的角色，因为后续的权限判断也是基于它
                 SetUtils.asSet(MenuTypeEnum.DIR.getType(), MenuTypeEnum.MENU.getType(), MenuTypeEnum.BUTTON.getType()),
                 SetUtils.asSet(CommonStatusEnum.ENABLE.getStatus()));
         // 拼接结果返回
@@ -74,7 +75,8 @@ public class SysAuthController {
     @GetMapping("list-menus")
     public CommonResult<List<SysAuthMenuRespVO>> listMenus() {
         // 获得用户拥有的菜单列表
-        List<SysMenuDO> menuList = permissionService.listRoleMenusFromCache(getLoginUserRoleIds(),
+        List<SysMenuDO> menuList = permissionService.listRoleMenusFromCache(
+                getLoginUserRoleIds(), // 注意，基于登陆的角色，因为后续的权限判断也是基于它
                 SetUtils.asSet(MenuTypeEnum.DIR.getType(), MenuTypeEnum.MENU.getType()), // 只要目录和菜单类型
                 SetUtils.asSet(CommonStatusEnum.ENABLE.getStatus())); // 只要开启的
         // 转换成 Tree 结构返回

src/main/java/cn/iocoder/dashboard/modules/system/dal/mysql/dao/dict/SysDictDataMapper.java

@@ -10,6 +10,7 @@ import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import org.apache.ibatis.annotations.Mapper;
 
+import java.util.Date;
 import java.util.List;
 
 import static com.baomidou.mybatisplus.core.metadata.OrderItem.asc;
@@ -42,4 +43,10 @@ public interface SysDictDataMapper extends BaseMapper<SysDictDataDO> {
                         .likeIfPresent("dict_type", reqVO.getDictType())
                         .eqIfPresent("status", reqVO.getStatus()));
     }
+
+    default boolean selectExistsByUpdateTimeAfter(Date maxUpdateTime) {
+        return selectOne(new QueryWrapper<SysDictDataDO>().select("id")
+                .gt("update_time", maxUpdateTime).last("LIMIT 1")) != null;
+    }
+
 }

src/main/java/cn/iocoder/dashboard/modules/system/mq/consumer/dict/SysDictDataRefreshConsumer.java

@@ -0,0 +1,29 @@
+package cn.iocoder.dashboard.modules.system.mq.consumer.dict;
+
+import cn.iocoder.dashboard.framework.redis.core.pubsub.AbstractChannelMessageListener;
+import cn.iocoder.dashboard.modules.system.mq.message.dict.SysDictDataRefreshMessage;
+import cn.iocoder.dashboard.modules.system.service.dict.SysDictDataService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.Resource;
+
+/**
+ * 针对 {@link SysDictDataRefreshMessage} 的消费者
+ *
+ * @author 芋道源码
+ */
+@Component
+@Slf4j
+public class SysDictDataRefreshConsumer extends AbstractChannelMessageListener<SysDictDataRefreshMessage> {
+
+    @Resource
+    private SysDictDataService dictDataService;
+
+    @Override
+    public void onMessage(SysDictDataRefreshMessage message) {
+        log.info("[onMessage][收到 DictData 刷新消息]");
+        dictDataService.initLocalCache();
+    }
+
+}

src/main/java/cn/iocoder/dashboard/modules/system/mq/consumer/SysMenuRefreshConsumer.java → src/main/java/cn/iocoder/dashboard/modules/system/mq/consumer/permission/SysMenuRefreshConsumer.java

@@ -1,6 +1,6 @@
-package cn.iocoder.dashboard.modules.system.mq.consumer;
+package cn.iocoder.dashboard.modules.system.mq.consumer.permission;
 
-import cn.iocoder.dashboard.framework.redis.core.listener.AbstractMessageListener;
+import cn.iocoder.dashboard.framework.redis.core.pubsub.AbstractChannelMessageListener;
 import cn.iocoder.dashboard.modules.system.mq.message.permission.SysMenuRefreshMessage;
 import cn.iocoder.dashboard.modules.system.service.permission.SysMenuService;
 import lombok.extern.slf4j.Slf4j;
@@ -8,9 +8,14 @@ import org.springframework.stereotype.Component;
 
 import javax.annotation.Resource;
 
+/**
+ * 针对 {@link SysMenuRefreshMessage} 的消费者
+ *
+ * @author 芋道源码
+ */
 @Component
 @Slf4j
-public class SysMenuRefreshConsumer extends AbstractMessageListener<SysMenuRefreshMessage> {
+public class SysMenuRefreshConsumer extends AbstractChannelMessageListener<SysMenuRefreshMessage> {
 
     @Resource
     private SysMenuService menuService;
@@ -18,12 +23,7 @@ public class SysMenuRefreshConsumer extends AbstractMessageListener<SysMenuRefre
     @Override
     public void onMessage(SysMenuRefreshMessage message) {
         log.info("[onMessage][收到 Menu 刷新消息]");
-        menuService.init();
-    }
-
-    @Override
-    public String getChannel() {
-        return SysMenuRefreshMessage.TOPIC;
+        menuService.initLocalCache();
     }
 
 }

src/main/java/cn/iocoder/dashboard/modules/system/mq/message/dict/SysDictDataRefreshMessage.java

@@ -0,0 +1,17 @@
+package cn.iocoder.dashboard.modules.system.mq.message.dict;
+
+import cn.iocoder.dashboard.framework.redis.core.pubsub.ChannelMessage;
+import lombok.Data;
+
+/**
+ * 字典数据数据刷新 Message
+ */
+@Data
+public class SysDictDataRefreshMessage implements ChannelMessage {
+
+    @Override
+    public String getChannel() {
+        return "system.dict-data.refresh";
+    }
+
+}

src/main/java/cn/iocoder/dashboard/modules/system/mq/message/package-info.java

@@ -1 +0,0 @@
-package cn.iocoder.dashboard.modules.system.mq.message;

src/main/java/cn/iocoder/dashboard/modules/system/mq/message/permission/SysMenuRefreshMessage.java

@@ -1,13 +1,17 @@
 package cn.iocoder.dashboard.modules.system.mq.message.permission;
 
+import cn.iocoder.dashboard.framework.redis.core.pubsub.ChannelMessage;
 import lombok.Data;
 
 /**
  * 菜单数据刷新 Message
  */
 @Data
-public class SysMenuRefreshMessage {
+public class SysMenuRefreshMessage implements ChannelMessage {
 
-    public static final String TOPIC = "system.menu.refresh";
+    @Override
+    public String getChannel() {
+        return "system.menu.refresh";
+    }
 
 }

src/main/java/cn/iocoder/dashboard/modules/system/mq/producer/dict/SysDictDataProducer.java

@@ -0,0 +1,27 @@
+package cn.iocoder.dashboard.modules.system.mq.producer.dict;
+
+import cn.iocoder.dashboard.framework.redis.core.util.RedisMessageUtils;
+import cn.iocoder.dashboard.modules.system.mq.message.dict.SysDictDataRefreshMessage;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.Resource;
+
+/**
+ * DictData 字典数据相关消息的 Producer
+ */
+@Component
+public class SysDictDataProducer {
+
+    @Resource
+    private StringRedisTemplate stringRedisTemplate;
+
+    /**
+     * 发送 {@link SysDictDataRefreshMessage} 消息
+     */
+    public void sendMenuRefreshMessage() {
+        SysDictDataRefreshMessage message = new SysDictDataRefreshMessage();
+        RedisMessageUtils.sendChannelMessage(stringRedisTemplate, message);
+    }
+
+}

src/main/java/cn/iocoder/dashboard/modules/system/mq/producer/package-info.java

@@ -1 +0,0 @@
-package cn.iocoder.dashboard.modules.system.mq.producer;

src/main/java/cn/iocoder/dashboard/modules/system/mq/producer/permission/SysMenuProducer.java

@@ -1,7 +1,7 @@
 package cn.iocoder.dashboard.modules.system.mq.producer.permission;
 
+import cn.iocoder.dashboard.framework.redis.core.util.RedisMessageUtils;
 import cn.iocoder.dashboard.modules.system.mq.message.permission.SysMenuRefreshMessage;
-import cn.iocoder.dashboard.util.json.JSONUtils;
 import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.stereotype.Component;
 
@@ -21,7 +21,7 @@ public class SysMenuProducer {
      */
     public void sendMenuRefreshMessage() {
         SysMenuRefreshMessage message = new SysMenuRefreshMessage();
-        stringRedisTemplate.convertAndSend(SysMenuRefreshMessage.TOPIC, JSONUtils.toJSONString(message));
+        RedisMessageUtils.sendChannelMessage(stringRedisTemplate, message);
     }
 
 }

src/main/java/cn/iocoder/dashboard/modules/system/service/dict/SysDictDataService.java

@@ -18,9 +18,9 @@ import java.util.List;
 public interface SysDictDataService extends DictDataFrameworkService {
 
     /**
-     * 初始化，主要是初始化缓存
+     * 初始化字典数据的本地缓存
      */
-    void init();
+    void initLocalCache();
 
     /**
      * 获得字典数据列表

src/main/java/cn/iocoder/dashboard/modules/system/service/dict/impl/SysDictDataServiceImpl.java

@@ -1,8 +1,10 @@
 package cn.iocoder.dashboard.modules.system.service.dict.impl;
 
+import cn.hutool.core.collection.CollUtil;
 import cn.iocoder.dashboard.common.enums.CommonStatusEnum;
 import cn.iocoder.dashboard.common.exception.util.ServiceExceptionUtil;
 import cn.iocoder.dashboard.common.pojo.PageResult;
+import cn.iocoder.dashboard.framework.mybatis.core.dataobject.BaseDO;
 import cn.iocoder.dashboard.modules.system.controller.dict.vo.data.SysDictDataCreateReqVO;
 import cn.iocoder.dashboard.modules.system.controller.dict.vo.data.SysDictDataExportReqVO;
 import cn.iocoder.dashboard.modules.system.controller.dict.vo.data.SysDictDataPageReqVO;
@@ -11,15 +13,19 @@ import cn.iocoder.dashboard.modules.system.convert.dict.SysDictDataConvert;
 import cn.iocoder.dashboard.modules.system.dal.mysql.dao.dict.SysDictDataMapper;
 import cn.iocoder.dashboard.modules.system.dal.mysql.dataobject.dict.SysDictDataDO;
 import cn.iocoder.dashboard.modules.system.dal.mysql.dataobject.dict.SysDictTypeDO;
+import cn.iocoder.dashboard.modules.system.mq.producer.dict.SysDictDataProducer;
 import cn.iocoder.dashboard.modules.system.service.dict.SysDictDataService;
 import cn.iocoder.dashboard.modules.system.service.dict.SysDictTypeService;
 import com.google.common.collect.ImmutableTable;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.PostConstruct;
 import javax.annotation.Resource;
 import java.util.ArrayList;
 import java.util.Comparator;
+import java.util.Date;
 import java.util.List;
 
 import static cn.iocoder.dashboard.modules.system.enums.SysErrorCodeConstants.*;
@@ -30,12 +36,22 @@ import static cn.iocoder.dashboard.modules.system.enums.SysErrorCodeConstants.*;
  * @author ruoyi
  */
 @Service
+@Slf4j
 public class SysDictDataServiceImpl implements SysDictDataService {
 
+    /**
+     * 排序 dictType > sort
+     */
     private static final Comparator<SysDictDataDO> COMPARATOR_TYPE_AND_SORT = Comparator
             .comparing(SysDictDataDO::getDictType)
             .thenComparingInt(SysDictDataDO::getSort);
 
+    /**
+     * 定时执行 {@link #schedulePeriodicRefresh()} 的周期
+     * 因为已经通过 Redis Pub/Sub 机制，所以频率不需要高
+     */
+    private static final long SCHEDULER_PERIOD = 5 * 60 * 1000L;
+
     /**
      * 字典数据缓存，第二个 key 使用 label
      *
@@ -50,6 +66,10 @@ public class SysDictDataServiceImpl implements SysDictDataService {
      * key2：字典值 value
      */
     private ImmutableTable<String, String, SysDictDataDO> valueDictDataCache;
+    /**
+     * 缓存字典数据的最大更新时间，用于后续的增量轮询，判断是否有更新
+     */
+    private volatile Date maxUpdateTime;
 
     @Resource
     private SysDictTypeService dictTypeService;
@@ -57,20 +77,56 @@ public class SysDictDataServiceImpl implements SysDictDataService {
     @Resource
     private SysDictDataMapper dictDataMapper;
 
+    @Resource
+    private SysDictDataProducer dictDataProducer;
+
     @Override
     @PostConstruct
-    public void init() {
-        // 获得字典数据
-        List<SysDictDataDO> list = this.listDictDatas();
+    public void initLocalCache() {
+        // 获取字典数据列表，如果有更新
+        List<SysDictDataDO> dataList = this.loadDictDataIfUpdate(maxUpdateTime);
+        if (CollUtil.isEmpty(dataList)) {
+            return;
+        }
+
         // 构建缓存
         ImmutableTable.Builder<String, String, SysDictDataDO> labelDictDataBuilder = ImmutableTable.builder();
         ImmutableTable.Builder<String, String, SysDictDataDO> valueDictDataBuilder = ImmutableTable.builder();
-        list.forEach(dictData -> {
+        dataList.forEach(dictData -> {
             labelDictDataBuilder.put(dictData.getDictType(), dictData.getLabel(), dictData);
             valueDictDataBuilder.put(dictData.getDictType(), dictData.getValue(), dictData);
         });
         labelDictDataCache = labelDictDataBuilder.build();
         valueDictDataCache = valueDictDataBuilder.build();
+        assert dataList.size() > 0; // 断言，避免告警
+        maxUpdateTime = dataList.stream().max(Comparator.comparing(BaseDO::getUpdateTime)).get().getUpdateTime();
+        log.info("[init][缓存字典数据，数量为:{}]", dataList.size());
+    }
+
+    @Scheduled(fixedDelay = SCHEDULER_PERIOD, initialDelay = SCHEDULER_PERIOD)
+    public void schedulePeriodicRefresh() {
+        initLocalCache();
+    }
+
+    /**
+     * 如果字典数据发生变化，从数据库中获取最新的全量字典数据。
+     * 如果未发生变化，则返回空
+     *
+     * @param maxUpdateTime 当前字典数据的最大更新时间
+     * @return 字典数据列表
+     */
+    private List<SysDictDataDO> loadDictDataIfUpdate(Date maxUpdateTime) {
+        // 第一步，判断是否要更新。
+        if (maxUpdateTime == null) { // 如果更新时间为空，说明 DB 一定有新数据
+            log.info("[loadDictDataIfUpdate][首次加载全量字典数据]");
+        } else { // 判断数据库中是否有更新的字典数据
+            if (!dictDataMapper.selectExistsByUpdateTimeAfter(maxUpdateTime)) {
+                return null;
+            }
+            log.info("[loadDictDataIfUpdate][增量加载全量字典数据]");
+        }
+        // 第二步，如果有更新，则从数据库加载所有字典数据
+        return dictDataMapper.selectList();
     }
 
     @Override
@@ -104,6 +160,8 @@ public class SysDictDataServiceImpl implements SysDictDataService {
         // 插入字典类型
         SysDictDataDO dictData = SysDictDataConvert.INSTANCE.convert(reqVO);
         dictDataMapper.insert(dictData);
+        // 发送消息
+        dictDataProducer.sendMenuRefreshMessage();
         return dictData.getId();
     }
 
@@ -114,6 +172,8 @@ public class SysDictDataServiceImpl implements SysDictDataService {
         // 更新字典类型
         SysDictDataDO updateObj = SysDictDataConvert.INSTANCE.convert(reqVO);
         dictDataMapper.updateById(updateObj);
+        // 发送消息
+        dictDataProducer.sendMenuRefreshMessage();
     }
 
     @Override
@@ -122,6 +182,8 @@ public class SysDictDataServiceImpl implements SysDictDataService {
         this.checkDictDataExists(id);
         // 删除字典数据
         dictDataMapper.deleteById(id);
+        // 发送消息
+        dictDataProducer.sendMenuRefreshMessage();
     }
 
     @Override

src/main/java/cn/iocoder/dashboard/modules/system/service/permission/SysMenuService.java

@@ -16,9 +16,9 @@ import java.util.List;
 public interface SysMenuService {
 
     /**
-     * 初始化菜单
+     * 初始化菜单的本地缓存
      */
-    void init();
+    void initLocalCache();
 
     /**
      * 获得所有菜单列表

src/main/java/cn/iocoder/dashboard/modules/system/service/permission/impl/SysMenuServiceImpl.java

@@ -77,8 +77,8 @@ public class SysMenuServiceImpl implements SysMenuService {
      */
     @Override
     @PostConstruct
-    public synchronized void init() {
-        // 获取
+    public synchronized void initLocalCache() {
+        // 获取菜单列表，如果有更新
         List<SysMenuDO> menuList = this.loadMenuIfUpdate(maxUpdateTime);
         if (CollUtil.isEmpty(menuList)) {
             return;
@@ -100,7 +100,7 @@ public class SysMenuServiceImpl implements SysMenuService {
 
     @Scheduled(fixedDelay = SCHEDULER_PERIOD, initialDelay = SCHEDULER_PERIOD)
     public void schedulePeriodicRefresh() {
-        init();
+        initLocalCache();
     }
 
     /**