add cacheService

Author: yennanliu

springBootBlog/src/main/java/com/yen/mdblog/service/CacheService.java

@@ -0,0 +1,28 @@
+package com.yen.mdblog.service;
+
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.stereotype.Service;
+
+/** Cache service created by gpt */
+@Service
+public class CacheService {
+
+    /**
+     * Generic method to cache a result.
+     *
+     * @param cacheName the name of the cache
+     * @param key       the cache key
+     * @param operation the operation to cache
+     * @param <T>       the type of the cached result
+     * @return the cached result
+     */
+    @Cacheable(value = "#{cacheName}", key = "#{key}")
+    public <T> T cacheResult(String cacheName, String key, CacheableOperation<T> operation) {
+        return operation.execute();
+    }
+
+    @FunctionalInterface
+    public interface CacheableOperation<T> {
+        T execute();
+    }
+}

springBootBlog/src/main/java/com/yen/mdblog/service/impl/PostServiceImpl.java

@@ -3,6 +3,7 @@
 import com.yen.mdblog.entity.Dto.SearchRequest;
 import com.yen.mdblog.entity.Po.Post;
 import com.yen.mdblog.mapper.PostMapper;
+import com.yen.mdblog.service.CacheService;
 import com.yen.mdblog.service.PostService;
 import java.util.List;
 import lombok.extern.slf4j.Slf4j;
@@ -16,14 +17,28 @@ public class PostServiceImpl implements PostService {
 
   @Autowired PostMapper postMapper;
 
-  @Override
-  @Cacheable(value = "authorId", key = "#authorId")
-  public List<Post> getPostsById(Integer authorId) {
-    // Simulate a time-consuming database operation
-    simulateDelay();
-    System.out.println(">>> Query slow DB get post by userId");
-    return postMapper.findById(authorId);
-  }
+  @Autowired private CacheService cacheService;
+
+    @Override
+    @Cacheable(value = "authorId", key = "#authorId")
+    public List<Post> getPostsById(Integer authorId) {
+      // Simulate a time-consuming database operation
+      simulateDelay();
+      System.out.println(">>> Query slow DB get post by userId");
+      return postMapper.findById(authorId);
+    }
+//
+//  @Override
+//  public List<Post> getPostsById(Integer authorId) {
+//    return cacheService.cacheResult(
+//        "authorId",
+//        "#authorId",
+//        () -> {
+//          simulateDelay();
+//          System.out.println(">>> Query slow DB get post by userId");
+//          return postMapper.findById(authorId);
+//        });
+//  }
 
   @Override
   public List<Post> getAllPost() {