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feat:修改缓存策略

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Naccl
2021-03-26 23:11:22 +08:00
parent 474f83a517
commit 72a3a973ce
1 changed files with 9 additions and 3 deletions
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src/main/java/top/naccl/dwz/service/impl/UrlServiceImpl.java
+9 -3
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@@ -26,7 +26,7 @@ public class UrlServiceImpl implements UrlService {
StringRedisTemplate redisTemplate; StringRedisTemplate redisTemplate;
//自定义长链接防重复字符串 //自定义长链接防重复字符串
private static final String DUPLICATE = "*"; private static final String DUPLICATE = "*";
//最近使用的短链接过期时间(分钟) //最近使用的短链接缓存过期时间(分钟)
private static final long TIMEOUT = 10; private static final long TIMEOUT = 10;
//创建布隆过滤器 //创建布隆过滤器
private static final BitMapBloomFilter FILTER = BloomFilterUtil.createBitMap(10); private static final BitMapBloomFilter FILTER = BloomFilterUtil.createBitMap(10);
@@ -36,11 +36,17 @@ public class UrlServiceImpl implements UrlService {
//查找Redis中是否有缓存 //查找Redis中是否有缓存
String longURL = redisTemplate.opsForValue().get(shortURL); String longURL = redisTemplate.opsForValue().get(shortURL);
if (longURL != null) { if (longURL != null) {
//有缓存 //有缓存，延迟缓存时间
redisTemplate.expire(shortURL, TIMEOUT, TimeUnit.MINUTES);
return longURL; return longURL;
} }
//Redis没有缓存，从数据库查找 //Redis没有缓存，从数据库查找
return urlMapper.getLongUrlByShortUrl(shortURL); longURL = urlMapper.getLongUrlByShortUrl(shortURL);
if (longURL != null) {
//数据库有此短链接，添加缓存
redisTemplate.opsForValue().set(shortURL, longURL, TIMEOUT, TimeUnit.MINUTES);
}
return longURL;
} }
@Override @Override