Spring Boot 使用Caffeine缓存

Caffeine是Java8重写Guava缓存，取代Guava缓存。
Spring Cache相关注解基础请查看这篇文章

Caffeine官方的介绍

caffeine官网
Caffeine是基于Java8的高性能，接近完美的缓存库。

demo

pom.xml
引入spring-context-support

		<dependency>
            <groupId>com.github.ben-manes.caffeine</groupId>
            <artifactId>caffeine</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>

或者spring-boot-starter-cache

		<dependency>
            <groupId>com.github.ben-manes.caffeine</groupId>
            <artifactId>caffeine</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>

Caffeine配置参数

• 注意
  refreshAfterWrite 要实例 LoadingCache 否则报错
  java.lang.IllegalStateException: refreshAfterWrite requires a LoadingCache

application.yml

spring:
  cache:
    cache-names:
      - cache1
      - cache2
    type: caffeine
    caffeine:
      spec:
        maximumSize=500,expireAfterAccess=600s

yml文件中的配置也可以通过bean来配置

CacheConfig.java

package com.jsong.wiki.blog.config;

import com.github.benmanes.caffeine.cache.CacheLoader;
import com.github.benmanes.caffeine.cache.Caffeine;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.springframework.cache.CacheManager;
import org.springframework.cache.caffeine.CaffeineCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.concurrent.TimeUnit;


@Configuration
public class CacheConfig {

    @Bean("caffeineCacheManager")
    public CacheManager caffeineCacheManager() {
        CaffeineCacheManager cacheManager = new CaffeineCacheManager();
        cacheManager.setCaffeine(Caffeine.newBuilder()
                .maximumSize(10_1000)
                .expireAfterAccess(5, TimeUnit.SECONDS));
        return cacheManager;
    }

    /* 如果配置refreshAfterWrite要有这个bean，否则报错
    java.lang.IllegalStateException: refreshAfterWrite requires a LoadingCache*/
    @Bean
    public CacheLoader<Object, Object> cacheLoader() {
        CacheLoader<Object, Object> cacheLoader = new CacheLoader<Object, Object>() {
            @Nullable
            @Override
            public Object load(@NonNull Object key) throws Exception {
                return null;
            }
        };
        return cacheLoader;
    }

}

CacheService.java

package com.jsong.wiki.blog.service;

import org.springframework.cache.annotation.*;
import org.springframework.stereotype.Component;

@EnableCaching
@CacheConfig(cacheNames = "caffeineCacheManager")
@Component
public class CacheService {

    @Cacheable(value = "cache1", key = "#root.target")
    public String getName() {
        System.out.println("cache1");
        return "cache1";
    }
}

最后

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