96微信编辑器官网,重庆百度seo整站优化,聊城阳谷网站建设,自己的卡盟网站怎么做分站java接口的查询如何能提高性能#xff0c;比每次都去数据库中查询要快的方案有了#xff0c;就是下面要介绍的。
一、添加依赖 dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-cache/artifactId…java接口的查询如何能提高性能比每次都去数据库中查询要快的方案有了就是下面要介绍的。
一、添加依赖 dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-cache/artifactId/dependencydependencygroupIdcom.github.ben-manes.caffeine/groupIdartifactIdcaffeine/artifactId/dependency
二、启动类上添加注解
org.springframework.cache.annotation.EnableCaching
三、配置 1、采用spring自带配置
############# 缓存配置 不推荐 建议自定义 #############
spring.cache.cache-namesUSER,ADVERT
spring.cache.caffeine.specinitialCapacity50,maximumSize500,expireAfterWrite30s,refreshAfterWrite7s
spring.cache.typecaffeine
2、自定义配置 /*** p 缓存名分类 /p*/
public enum CacheNameEnum {/*** 用户*/USER(5, 20L, 60L),/*** 推荐*/ADVERT(5, 10L, 120L);private final Integer initialCapacity;private final Long maximumSize;private final Long expire;CacheNameEnum(Integer initialCapacity, Long maximumSize, Long expire) {this.initialCapacity initialCapacity;this.maximumSize maximumSize;this.expire expire;}public Long getMaximumSize() {return maximumSize;}public Integer getInitialCapacity() {return initialCapacity;}public Long getExpire() {return expire;}
}
import com.coocaa.system.enums.CacheNameEnum;
import com.github.benmanes.caffeine.cache.Caffeine;
import org.springframework.cache.CacheManager;
import org.springframework.cache.caffeine.CaffeineCache;
import org.springframework.cache.support.SimpleCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import java.time.Duration;
import java.util.ArrayList;
import java.util.List;/*** author songjianyong* p 本地缓存配置 /p*/
Configuration
public class CaffeineCacheConfig {private static final SimpleCacheManager SIMPLE_CACHE_MANAGER new SimpleCacheManager();Beanpublic CacheManager caffeineCacheManager() {ListCaffeineCache caches new ArrayList();for (CacheNameEnum value : CacheNameEnum.values()) {com.github.benmanes.caffeine.cache.CacheObject, Object cache Caffeine.newBuilder().initialCapacity(value.getInitialCapacity()).maximumSize(value.getMaximumSize())//写入后失效时间.expireAfterWrite(Duration.ofSeconds(value.getExpire())).build();caches.add(new CaffeineCache(value.name(), cache));}SIMPLE_CACHE_MANAGER.setCaches(caches);return SIMPLE_CACHE_MANAGER;}}
四、使用注解
org.springframework.cache.annotation.Cacheable(value USER, key#p0.id)
五、进阶处理
自定义 CaffeineCacheManager
import com.coocaa.ops.admin.common.enums.CacheNameEnum;
import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.CacheLoader;
import com.github.benmanes.caffeine.cache.Caffeine;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.cache.caffeine.CaffeineCacheManager;
import org.springframework.context.annotation.Configuration;
import org.springframework.lang.NonNull;
import org.springframework.lang.Nullable;import java.util.HashMap;
import java.util.Map;/*** 自定义 CaffeineCacheManager** author songjianyong*/
Configuration
public class SongCaffeineCacheManager extends CaffeineCacheManager implements InitializingBean {private final MapString, CaffeineObject, Object builders new HashMap();Nullableprivate CacheLoaderObject, Object cacheLoader;Overridepublic void afterPropertiesSet() throws Exception {for (CacheNameEnum value : CacheNameEnum.values()) {builders.put(value.getCacheName(), Caffeine.from(value.getSpec()));}}OverrideNonNullprotected CacheObject, Object createNativeCaffeineCache(NonNull String name) {CaffeineObject, Object builder builders.get(name);if (builder null) {return super.createNativeCaffeineCache(name);}if (this.cacheLoader ! null) {return builder.build(this.cacheLoader);} else {return builder.build();}}Overridepublic void setCacheLoader(NonNull CacheLoaderObject, Object cacheLoader) {super.setCacheLoader(cacheLoader);this.cacheLoader cacheLoader;}
}
辅助代码
/*** 缓存名称枚举** author songjianyong*/
public enum CacheNameEnum {/*** 接口响应结果缓存名称*/SONG_API_RESPONSE(SONG:API:RESPONSE, initialCapacity5,maximumSize50,expireAfterWrite1d),JIAN_API_RESPONSE(JIAN:API:RESPONSE, initialCapacity10,maximumSize100,expireAfterWrite15d);/*** 缓存名称*/private final String cacheName;/*** spec*/private final String spec;CacheNameEnum(String cacheName, String spec) {this.cacheName cacheName;this.spec spec;}public String getCacheName() {return cacheName;}public String getSpec() {return spec;}
} 补充下注解
Cacheable表示该方法支持缓存。当调用被注解的方法时如果对应的键已经存在缓存则不再执行方法体而从缓存中直接返回。当方法返回null时将不进行缓存操作。CachePut表示执行该方法后其值将作为最新结果更新到缓存中每次都会执行该方法。CacheEvict表示执行该方法后将触发缓存清除操作。Caching用于组合前三个注解例如
Caching(cacheable Cacheable(CacheConstants.GET_USER),evict {CacheEvict(CacheConstants.GET_DYNAMIC,allEntries true)}
public User find(Integer id) {return null;
}
cacheNames/value缓存组件的名字即cacheManager中缓存的名称。key缓存数据时使用的key。默认使用方法参数值也可以使用SpEL表达式进行编写。keyGenerator和key二选一使用。cacheManager指定使用的缓存管理器。condition在方法执行开始前检查在符合condition的情况下进行缓存unless在方法执行完成后检查在符合unless的情况下不进行缓存sync是否使用同步模式。若使用同步模式在多个线程同时对一个key进行load时其他线程将被阻塞。
