请先看

https://my.oschina.net/u/3866531/blog/1840386

CompositeCacheManager类

Composite，混合的，混成的

Spring提供CompositeCacheManager的主要目的就是为了混合使用多种缓存时进行管理。

一、实际测试--CompositeCacheManager中打断点

断点打在getCache上

GuavaDataCache源码--去掉类上的@CacheConfig(cacheManager = "guavaCacheManager")注解

package com.ding.data.cache;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.annotation.PostConstruct;import org.springframework.cache.annotation.CacheEvict;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;@Service//@CacheConfig(cacheManager = "guavaCacheManager")public class GuavaDataCache {private Map<Long, String> dataMap = new HashMap<Long, String>();/*** 初始化*/@PostConstructpublic void init() {dataMap.put(1L, "张三");dataMap.put(2L, "李四");dataMap.put(3L, "王五");}/*** 查询* 如果数据没有缓存,那么从dataMap里面获取,如果缓存了,* 那么从guavaDemo里面获取* 并且将缓存的数据存入到 guavaDemo里面* 其中key 为 #id+dataMap*/@Cacheable(value="guavaDemo" ,key="#id + 'dataMap'")public String query(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : query id is " + id);return dataMap.get(id);}/*** 插入 或者更新* 插入或更新数据到dataMap中* 并且缓存到 guavaDemo中* 如果存在了那么更新缓存中的值* 其中key 为 #id+dataMap*/@CachePut(value="guavaDemo" ,key="#id + 'dataMap'")public String put(Long id, String value) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : add data ,id is "+ id);dataMap.put(id, value);// data persistencereturn value;}/*** 删除* 删除dataMap里面的数据* 并且删除缓存guavaDemo中的数据* 其中key 为 #id+dataMap*/@CacheEvict(value="guavaDemo" , key="#id + 'dataMap'")public void remove(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : remove id is "+ id + " data");dataMap.remove(id);// data remove  }}

RedisDataCache源码--去掉类上的@CacheConfig(cacheManager = "redisCacheManager")注解

package com.ding.data.cache;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.annotation.PostConstruct;import org.springframework.cache.annotation.CacheEvict;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;@Service//@CacheConfig(cacheManager = "redisCacheManager")public class RedisDataCache {private Map<Long, String> dataMap = new HashMap<Long, String>();/*** 初始化*/@PostConstructpublic void init() {dataMap.put(1L, "111");dataMap.put(2L, "222");dataMap.put(3L, "333");}/*** 查询* 如果数据没有缓存,那么从dataMap里面获取,如果缓存了,* 那么从guavaDemo里面获取* 并且将缓存的数据存入到 guavaDemo里面* 其中key 为 #id+dataMap*/@Cacheable(value="redisDemo" ,key="#id + 'dataMap'")public String query(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : query id is " + id);return dataMap.get(id);}/*** 插入 或者更新* 插入或更新数据到dataMap中* 并且缓存到 guavaDemo中* 如果存在了那么更新缓存中的值* 其中key 为 #id+dataMap*/@CachePut(value="redisDemo" ,key="#id + 'dataMap'")public String put(Long id, String value) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : add data ,id is "+ id);dataMap.put(id, value);// data persistencereturn value;}/*** 删除* 删除dataMap里面的数据* 并且删除缓存guavaDemo中的数据* 其中key 为 #id+dataMap*/@CacheEvict(value="redisDemo" , key="#id + 'dataMap'")public void remove(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : remove id is "+ id + " data");dataMap.remove(id);// data remove  }}

访问http://localhost:8080/get?id=1，进入断点，看到如下

访问http://localhost:8080/getr?id=1，进入断点，看到如下

所以可见此时是通过CompositeCacheManager进行管理的，CacheConfig类中的CompositeCacheManager 起作用了

package com.ding.data.config;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.concurrent.TimeUnit;import javax.annotation.Resource;import org.springframework.boot.ApplicationArguments;import org.springframework.boot.ApplicationRunner;import org.springframework.cache.CacheManager;import org.springframework.cache.guava.GuavaCacheManager;import org.springframework.cache.support.CompositeCacheManager;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.data.redis.cache.RedisCacheManager;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.serializer.StringRedisSerializer;import com.google.common.cache.CacheBuilder;import com.google.common.collect.Lists;@Configurationpublic class CacheConfig implements ApplicationRunner {@Resourceprivate List<CacheManager> cacheManagers;public void run(ApplicationArguments args) throws Exception {System.out.println("CacheManager大小为=========" + cacheManagers.size());System.out.println("=================================================");for(CacheManager c:cacheManagers){System.out.println(c.getCacheNames());}}@Bean(name = "redisCacheManager")public RedisCacheManager redisCacheManager(RedisTemplate<Object, Object> redisTemplate) {redisTemplate.setKeySerializer(new StringRedisSerializer());RedisCacheManager redisCacheManager = new RedisCacheManager(redisTemplate);redisCacheManager.setCacheNames(Arrays.asList("redisDemo"));redisCacheManager.setUsePrefix(true);return redisCacheManager;}@Bean(name = "guavaCacheManager")public GuavaCacheManager getGuavaCacheManager() {GuavaCacheManager guavaCacheManager = new GuavaCacheManager();guavaCacheManager.setCacheBuilder(CacheBuilder.newBuilder().expireAfterWrite(3600, TimeUnit.SECONDS).maximumSize(1000));ArrayList<String> guavaCacheNames = Lists.newArrayList();guavaCacheNames.add("guavaDemo");guavaCacheManager.setCacheNames(guavaCacheNames);return guavaCacheManager;}@Bean(name = "cacheManager")@Primarypublic CompositeCacheManager cacheManager(RedisCacheManager redisCacheManager,GuavaCacheManager guavaCacheManager) {CompositeCacheManager cacheManager = new CompositeCacheManager(redisCacheManager, guavaCacheManager);return cacheManager;}}

• 二、实际测试--CompositeCacheManager中打断点

断点打在getCache上

GuavaDataCache源码--加上类上的@CacheConfig(cacheManager = "guavaCacheManager")注解

package com.ding.data.cache;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.annotation.PostConstruct;import org.springframework.cache.annotation.CacheEvict;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;@Service@CacheConfig(cacheManager = "guavaCacheManager")public class GuavaDataCache {private Map<Long, String> dataMap = new HashMap<Long, String>();/*** 初始化*/@PostConstructpublic void init() {dataMap.put(1L, "张三");dataMap.put(2L, "李四");dataMap.put(3L, "王五");}/*** 查询* 如果数据没有缓存,那么从dataMap里面获取,如果缓存了,* 那么从guavaDemo里面获取* 并且将缓存的数据存入到 guavaDemo里面* 其中key 为 #id+dataMap*/@Cacheable(value="guavaDemo" ,key="#id + 'dataMap'")public String query(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : query id is " + id);return dataMap.get(id);}/*** 插入 或者更新* 插入或更新数据到dataMap中* 并且缓存到 guavaDemo中* 如果存在了那么更新缓存中的值* 其中key 为 #id+dataMap*/@CachePut(value="guavaDemo" ,key="#id + 'dataMap'")public String put(Long id, String value) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : add data ,id is "+ id);dataMap.put(id, value);// data persistencereturn value;}/*** 删除* 删除dataMap里面的数据* 并且删除缓存guavaDemo中的数据* 其中key 为 #id+dataMap*/@CacheEvict(value="guavaDemo" , key="#id + 'dataMap'")public void remove(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : remove id is "+ id + " data");dataMap.remove(id);// data remove  }}

RedisDataCache源码--去掉类上的@CacheConfig(cacheManager = "redisCacheManager")注解

package com.ding.data.cache;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.annotation.PostConstruct;import org.springframework.cache.annotation.CacheEvict;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;@Service@CacheConfig(cacheManager = "redisCacheManager")public class RedisDataCache {private Map<Long, String> dataMap = new HashMap<Long, String>();/*** 初始化*/@PostConstructpublic void init() {dataMap.put(1L, "111");dataMap.put(2L, "222");dataMap.put(3L, "333");}/*** 查询* 如果数据没有缓存,那么从dataMap里面获取,如果缓存了,* 那么从guavaDemo里面获取* 并且将缓存的数据存入到 guavaDemo里面* 其中key 为 #id+dataMap*/@Cacheable(value="redisDemo" ,key="#id + 'dataMap'")public String query(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : query id is " + id);return dataMap.get(id);}/*** 插入 或者更新* 插入或更新数据到dataMap中* 并且缓存到 guavaDemo中* 如果存在了那么更新缓存中的值* 其中key 为 #id+dataMap*/@CachePut(value="redisDemo" ,key="#id + 'dataMap'")public String put(Long id, String value) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : add data ,id is "+ id);dataMap.put(id, value);// data persistencereturn value;}/*** 删除* 删除dataMap里面的数据* 并且删除缓存guavaDemo中的数据* 其中key 为 #id+dataMap*/@CacheEvict(value="redisDemo" , key="#id + 'dataMap'")public void remove(Long id) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");System.out.println(sdf.format(new Date()) + " : remove id is "+ id + " data");dataMap.remove(id);// data remove  }}

访问http://localhost:8080/get?id=1，没进入断点

访问http://localhost:8080/getr?id=1，没进入断点

所以可见，此时因为标注上了 @CacheConfig(cacheManager = "guavaCacheManager") 和 @CacheConfig(cacheManager = "redisCacheManager") ，所以直接就知道需要用哪个CacheManager了，不需要CompositeCacheManager去匹配了

直接去掉CacheConfig类中的CompositeCacheManager ，在不同的缓存上加上 @CacheConfig(cacheManager = "guavaCacheManager") 和 @CacheConfig(cacheManager = "redisCacheManager")，是否可以？——测试一下

此时的CacheConfig类代码

package com.ding.data.config;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.concurrent.TimeUnit;import javax.annotation.Resource;import org.springframework.boot.ApplicationArguments;import org.springframework.boot.ApplicationRunner;import org.springframework.cache.CacheManager;import org.springframework.cache.guava.GuavaCacheManager;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.cache.RedisCacheManager;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.serializer.StringRedisSerializer;import com.google.common.cache.CacheBuilder;import com.google.common.collect.Lists;@Configurationpublic class CacheConfig implements ApplicationRunner {@Resourceprivate List<CacheManager> cacheManagers;public void run(ApplicationArguments args) throws Exception {System.out.println("CacheManager大小为=========" + cacheManagers.size());System.out.println("=================================================");for(CacheManager c:cacheManagers){System.out.println(c.getCacheNames());}}@Bean(name = "redisCacheManager")public RedisCacheManager redisCacheManager(RedisTemplate<Object, Object> redisTemplate) {redisTemplate.setKeySerializer(new StringRedisSerializer());RedisCacheManager redisCacheManager = new RedisCacheManager(redisTemplate);redisCacheManager.setCacheNames(Arrays.asList("redisDemo"));redisCacheManager.setUsePrefix(true);return redisCacheManager;}@Bean(name = "guavaCacheManager")public GuavaCacheManager getGuavaCacheManager() {GuavaCacheManager guavaCacheManager = new GuavaCacheManager();guavaCacheManager.setCacheBuilder(CacheBuilder.newBuilder().expireAfterWrite(3600, TimeUnit.SECONDS).maximumSize(1000));ArrayList<String> guavaCacheNames = Lists.newArrayList();guavaCacheNames.add("guavaDemo");guavaCacheManager.setCacheNames(guavaCacheNames);return guavaCacheManager;}// @Bean(name = "cacheManager")// @Primary// public CompositeCacheManager cacheManager(// RedisCacheManager redisCacheManager,// GuavaCacheManager guavaCacheManager) {// CompositeCacheManager cacheManager = new CompositeCacheManager(// redisCacheManager, guavaCacheManager);// return cacheManager;// }}

结果启动时就报错了

java.lang.IllegalStateException: No CacheResolver specified, and no unique bean of type CacheManager found. Mark one as primary (or give it the name 'cacheManager') or declare a specific CacheManager to use, that serves as the default one.

at org.springframework.cache.interceptor.CacheAspectSupport.afterSingletonsInstantiated(CacheAspectSupport.java:186) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:792) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]

at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]

at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]

at com.ding.data.App.main(App.java:33) [classes/:na]

上面报错是因为Spring Context 中存在多个实现了 CacheManager.class 的 Bean，需要使用 @Primary 注解指定优先选择的 CacheManager

那么指定 GuavaCacheManager 为 @Primary，此时的CacheConfig类代码

package com.ding.data.config;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.concurrent.TimeUnit;import javax.annotation.Resource;import org.springframework.boot.ApplicationArguments;import org.springframework.boot.ApplicationRunner;import org.springframework.cache.CacheManager;import org.springframework.cache.guava.GuavaCacheManager;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.data.redis.cache.RedisCacheManager;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.serializer.StringRedisSerializer;import com.google.common.cache.CacheBuilder;import com.google.common.collect.Lists;@Configurationpublic class CacheConfig implements ApplicationRunner {@Resourceprivate List<CacheManager> cacheManagers;public void run(ApplicationArguments args) throws Exception {System.out.println("CacheManager大小为=========" + cacheManagers.size());System.out.println("=================================================");for(CacheManager c:cacheManagers){System.out.println(c.getCacheNames());}}@Bean(name = "redisCacheManager")public RedisCacheManager redisCacheManager(RedisTemplate<Object, Object> redisTemplate) {redisTemplate.setKeySerializer(new StringRedisSerializer());RedisCacheManager redisCacheManager = new RedisCacheManager(redisTemplate);redisCacheManager.setCacheNames(Arrays.asList("redisDemo"));redisCacheManager.setUsePrefix(true);return redisCacheManager;}@Bean(name = "guavaCacheManager")@Primarypublic GuavaCacheManager getGuavaCacheManager() {GuavaCacheManager guavaCacheManager = new GuavaCacheManager();guavaCacheManager.setCacheBuilder(CacheBuilder.newBuilder().expireAfterWrite(3600, TimeUnit.SECONDS).maximumSize(1000));ArrayList<String> guavaCacheNames = Lists.newArrayList();guavaCacheNames.add("guavaDemo");guavaCacheManager.setCacheNames(guavaCacheNames);return guavaCacheManager;}// @Bean(name = "cacheManager")// @Primary// public CompositeCacheManager cacheManager(// RedisCacheManager redisCacheManager,// GuavaCacheManager guavaCacheManager) {// CompositeCacheManager cacheManager = new CompositeCacheManager(// redisCacheManager, guavaCacheManager);// return cacheManager;// }}

正常启动，刚才的报错消失

测试，一切正常

所以不需要使用CompositeCacheManager类，在使用缓存的地方通过 @CacheConfig 指定CacheManager，就可以混合使用多种缓存组件了。同时，要记得在配置类中指定一个 @Primary 缓存