springboot看看这个Guavacache与caffeine看来Guavacache不能再用了

今天天看这个发现 ecache 对多线程的处理还要自己加锁来处理&＃xff0c;Guava cache 是有问题的&＃xff0c;现在最新的caffeine是不要再加锁来处理。

https://softwaremill.com/race-condition-cache-guava-caffeine/

我空我写个测试来测一下上边的问题&＃xff0c;现用caffeine做个对比&＃xff0c;现在没空先记录一下。

http://www.manongjc.com/article/48915.html

这个是使用caffeine的好文章。

来个测试用例吧&＃xff1a;

1. 

org.springframework.bootspring-boot-starter-cachecom.github.ben-manes.caffeinecaffeine2.6.2>

2.

import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.CaffeineSpec;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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;&＃64;Configuration
&＃64;EnableCaching
public class InitConfig {private static final Logger logger &＃61; LoggerFactory.getLogger(InitConfig.class);/*** caffeine CacheManager* &＃64;return*/&＃64;Bean("caffeine")public CacheManager cacheManager() {String caffeineSpec &＃61; "initialCapacity&＃61;50,maximumSize&＃61;500,refreshAfterWrite&＃61;10s";CaffeineSpec spec &＃61; CaffeineSpec.parse(caffeineSpec);Caffeine caffeine &＃61; Caffeine.from(spec);CaffeineCacheManager cacheManager &＃61; new CaffeineCacheManager();cacheManager.setCaffeine(caffeine);cacheManager.setAllowNullValues(false);CacheLoader cacheLoader &＃61; key -> null;cacheManager.setCacheLoader(cacheLoader);return cacheManager;}
}

3. 单独调用( 10s 后过期 )&＃xff1a;

import org.springframework.cache.CacheManager;
import org.springframework.test.context.junit4.SpringRunner;import javax.annotation.Resource;&＃64;RunWith(SpringRunner.class)
&＃64;SpringBootTest
public class Demo2ApplicationTests {&＃64;Resource&＃64;Qualifier("caffeine")private CacheManager cacheManager;&＃64;Testpublic void contextLoads() {while(true){//System.out.println(cacheManager.getCacheNames());Cache cache &＃61; cacheManager.getCache("");if ( cache !&＃61; null ) {String s &＃61; cache.get("123", String.class);System.out.println(s);if ( s &＃61;&＃61; null ) {cache.put("123", "456");String s1 &＃61; cache.get("123", String.class);System.out.println( "null....."&＃43;s1 );}System.out.println(s);}try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}}}}