From ee248b483dab04b6ad312c255392cab67e08c8f8 Mon Sep 17 00:00:00 2001
From: none <none>
Date: Mon, 20 Mar 2023 18:02:13 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BA=BF=E4=B8=8A=E8=AF=BE=E7=BC=93=E5=AD=98?=
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---
 .../xyz/playedu/api/caches/CourseCache.java   | 42 +++++++++++++++++++
 .../controller/frontend/HourController.java   | 16 ++++---
 2 files changed, 52 insertions(+), 6 deletions(-)
 create mode 100644 src/main/java/xyz/playedu/api/caches/CourseCache.java

diff --git a/src/main/java/xyz/playedu/api/caches/CourseCache.java b/src/main/java/xyz/playedu/api/caches/CourseCache.java
new file mode 100644
index 0000000..e5bdb04
--- /dev/null
+++ b/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);
+    }
+
+}
diff --git a/src/main/java/xyz/playedu/api/controller/frontend/HourController.java b/src/main/java/xyz/playedu/api/controller/frontend/HourController.java
index e83335d..8137dc0 100644
--- a/src/main/java/xyz/playedu/api/controller/frontend/HourController.java
+++ b/src/main/java/xyz/playedu/api/controller/frontend/HourController.java
@@ -4,6 +4,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 import xyz.playedu.api.PlayEduFCtx;
+import xyz.playedu.api.caches.CourseCache;
 import xyz.playedu.api.caches.UserCanSeeCourseCache;
 import xyz.playedu.api.domain.*;
 import xyz.playedu.api.exception.NotFoundException;
@@ -31,18 +32,21 @@ public class HourController {
     @Autowired
     private CourseHourService hourService;
 
-    @Autowired
-    private UserCanSeeCourseCache userCanSeeCourseCache;
-
     @Autowired
     private ResourceService resourceService;
 
     @Autowired
     private UserCourseHourRecordService userCourseHourRecordService;
 
+    @Autowired
+    private UserCanSeeCourseCache userCanSeeCourseCache;
+
+    @Autowired
+    private CourseCache courseCache;
+
     @GetMapping("/{id}/play")
     public JsonResponse play(@PathVariable(name = "courseId") Integer courseId, @PathVariable(name = "id") Integer id) throws NotFoundException, ServiceException {
-        Course course = courseService.findOrFail(courseId);
+        Course course = courseCache.findOrFail(courseId);
         userCanSeeCourseCache.check(PlayEduFCtx.getUser(), course, true);
         CourseHour hour = hourService.findOrFail(id, courseId);
         Resource resource = resourceService.findOrFail(hour.getRid());
@@ -63,7 +67,7 @@ public class HourController {
         }
         User user = PlayEduFCtx.getUser();
         // 线上课检测
-        Course course = courseService.findOrFail(courseId);
+        Course course = courseCache.findOrFail(courseId);
         // 权限校验
         userCanSeeCourseCache.check(user, course, true);
         // 课时检测
@@ -76,7 +80,7 @@ public class HourController {
 
     @PostMapping("/{id}/ping")
     public JsonResponse ping(@PathVariable(name = "courseId") Integer courseId, @PathVariable(name = "id") Integer id) throws NotFoundException, ServiceException {
-        Course course = courseService.findOrFail(courseId);
+        Course course = courseCache.findOrFail(courseId);
         userCanSeeCourseCache.check(PlayEduFCtx.getUser(), course, true);
         return JsonResponse.success();
     }