More control of CaffeineCacheManager, PreprocessService as interface

src/main/java/com/backend/hls/proxy/config/CacheConfig.java

@@ -1,18 +1,37 @@
 package com.backend.hls.proxy.config;
 
+import java.util.concurrent.TimeUnit;
+
 import org.springframework.cache.CacheManager;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.caffeine.CaffeineCacheManager;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
+import com.backend.hls.proxy.model.SimpleResponse;
+import com.github.benmanes.caffeine.cache.Caffeine;
+
 @Configuration
 @EnableCaching
 public class CacheConfig {
 
     @Bean
     public CacheManager cacheManager() {
-        return new CaffeineCacheManager("hlsPlaylistContent", "playlistSegmentContent");
+        CaffeineCacheManager cacheManager = new CaffeineCacheManager("hlsPlaylistContent", "playlistSegmentContent");
+        cacheManager.setCaffeine(Caffeine.newBuilder()
+                .expireAfterAccess(1, TimeUnit.HOURS)
+                .weigher((Object key, Object value) -> {
+                    if (value instanceof byte[] valueBytes) {
+                        return valueBytes.length;
+                    }
+                    if (value instanceof SimpleResponse<?> response && response.getBody() instanceof byte[] body) {
+                        return body.length;
+                    }
+                    return 0;
+                })
+                .maximumWeight(500 * 1024 * 1024)
+                .recordStats());
+        return cacheManager;
     }
 
 }