线上课缓存

src/main/java/xyz/playedu/api/caches/CourseCache.java

@@ -0,0 +1,42 @@
+package xyz.playedu.api.caches;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import xyz.playedu.api.domain.Course;
+import xyz.playedu.api.exception.NotFoundException;
+import xyz.playedu.api.service.CourseService;
+import xyz.playedu.api.util.RedisUtil;
+
+/**
+ * @Author 杭州白书科技有限公司
+ * @create 2023/3/20 17:57
+ */
+@Component
+public class CourseCache {
+
+    @Autowired
+    private CourseService courseService;
+
+    private final static String keyTemplate = "course:%d";
+
+    private final static int expire = 3600;//s
+
+    public Course findOrFail(Integer id) throws NotFoundException {
+        String keyName = key(id);
+        if (RedisUtil.exists(keyName)) {
+            return (Course) RedisUtil.get(keyName);
+        }
+        Course course = courseService.findOrFail(id);
+        put(course);
+        return course;
+    }
+
+    public void put(Course course) {
+        RedisUtil.set(key(course.getId()), course, expire);
+    }
+
+    private String key(Integer courseId) {
+        return String.format(keyTemplate, courseId);
+    }
+
+}