Caffeine本地缓存Demo
作者：互联网
- Gauva基于LRU算法，Caffeine基于W-TinyLFU算法（结合了LRU和LFU的特点） Caffeine支持异步加载 Caffeine性能和开销都优于Guava Caffeine的命中率更高
public class TestCaffeine {
public static void main(String[] args) throws Exception {
// 1、手动加载
Cache<String, String> cache = Caffeine.newBuilder()
.expireAfterWrite(10, TimeUnit.MINUTES)
.maximumSize(10)
.build();
cache.put("key1", "test1");
System.out.println("手动加载：" + cache.getIfPresent("key1"));
System.out.println("---");
// 2、LoadingCache自动加载
LoadingCache<String, String> cache1 = Caffeine.newBuilder()
.expireAfterWrite(10, TimeUnit.MINUTES)
.maximumSize(10)
.build(new CacheLoader<String, String>() {
@Override
public @Nullable
String load(@NonNull String s) throws Exception {
return s + "_value";
}
});
System.out.println("LoadingCache自动加载：" + cache1.get("key1"));
System.out.println("---");
// 3、异步手动加载
AsyncCache<String, String> cache2 = Caffeine.newBuilder()
.expireAfterWrite(10, TimeUnit.MINUTES)
.maximumSize(10)
.buildAsync();
CompletableFuture<String> future = cache2.get("key1", key -> {
return key + "_value111";
});
System.out.println("异步手动加载：" + future.get());
System.out.println("---");
// 4、异步自动加载
AsyncLoadingCache<String, String> cache3 = Caffeine.newBuilder()
.expireAfterWrite(10, TimeUnit.MINUTES)
.maximumSize(10)
.buildAsync(new CacheLoader<String, String>() {
@Override
public @Nullable
String load(@NonNull String s) throws Exception {
return s + "_syncvalue";
}
});
System.out.println("异步自动加载：" + cache3.get("key3").get());
}