谷歌开源框架Guava Cache实现本地缓存，封装API

一.Guava Cache基本介绍

github地址：https://github.com/google/guava/wiki/CachesExplained

全内存的本地缓存实现

⾼性能且功能丰富

线程安全，操作简单 (底层实现机制类似ConcurrentMap)

 

二.在pom.xml中添加相应的依赖

<!--guava依赖包-->
 <dependency>
 <groupId>com.google.guava</groupId>
 <artifactId>guava</artifactId>
 <version>19.0</version>
 </dependency>

三.封装api

 private Cache<String,Object> cache = CacheBuilder.newBuilder()
 //设置缓存初始⼤⼩，应该合理设置，后续会扩容
 .initialCapacity(10)
 //最⼤值
 .maximumSize(100)
 //并发数设置
 .concurrencyLevel(5)
 //缓存过期时间，写⼊后10分钟过期
 .expireAfterWrite(600,TimeUnit.SECONDS)
 //统计缓存命中率
 .recordStats()
 .build();
 public Cache<String, Object> getcache() {
 return cache;
 }
 public void setcache(Cache<String, Object> cache) {
 this.cache = cache;
 }

四.serviceImpl中具体实现

 @Autowired
 BaseCache baseCache;
 public List<Video> videoList()
    {
        try{
            Object cacheObj =
                    baseCache.getCache().get(CacheKeyManager.INDEX_VIDEO_LIST,()->{
                        List<Video> videoList = videoMapper.videoList();
                        return videoList;
                    });
            if(cacheObj instanceof List){
                List<Video> videoList = (List<Video>)cacheObj;
                return videoList;
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }