在没有 XML 配置的情况下将 Ehcache CacheManager (v 3.x) 转换为 Spring CacheManager答案

【问题标题】：Converting Ehcache CacheManager (v 3.x) to Spring CacheManager without XML configuration在没有 XML 配置的情况下将 Ehcache CacheManager (v 3.x) 转换为 Spring CacheManager
【发布时间】：2019-05-24 14:00:08
【问题描述】：

我正在尝试在我的应用程序中使用 Ehcache 管理器。我想在没有 xml 配置的情况下设置它。我有下一个依赖项：

<dependency>
    <groupId>org.ehcache</groupId>
    <artifactId>ehcache</artifactId>
    <version>3.6.0</version>
</dependency>
<dependency>
    <groupId>javax.cache</groupId>
    <artifactId>cache-api</artifactId>
    <version>1.0.0</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
    <version>5.1.1.RELEASE</version>
</dependency>

我有这样的 CacheManager bean：

@Bean
public org.springframework.cache.CacheManager cacheManager() {
    org.ehcache.CacheManager mainPageCache = CacheManagerBuilder
            .newCacheManagerBuilder()
            .withCache("mainPageCache", CacheConfigurationBuilder
                    .newCacheConfigurationBuilder(
                            Pageable.class,
                            Collection.class,
                            ResourcePoolsBuilder.heap(10))
                    .withExpiry(ExpiryPolicyBuilder
                            .timeToLiveExpiration(Duration
                                    .of(10, ChronoUnit.SECONDS))))
            .build(true);
    // ...
}

是否可以将 Ehcache CacheManager 转换为 Spring CacheManager？我认为应该是这样的：return new JCacheCacheManager(/*some code*/);

【问题讨论】：

您构建的缓存管理器根本没有使用 JCache，因此您需要先这样做，请参阅ehcache.org/documentation/3.0/107.html

标签： java spring ehcache spring-cache ehcache-3

【解决方案1】：

您不能简单地将 ehcache CacheManager 转换为 spring CacheManager。

您可以使用org.ehcache.jsr107.EhcacheCachingProvider 获取javax.cache.CacheManager 并将其提供给org.springframework.cache.jcache.JCacheCacheManager，这是org.springframework.cache.CacheManager for jcache（又名jsr107）的实现。

import java.util.HashMap;
import java.util.Map;

import javax.cache.CacheManager;
import javax.cache.Caching;

import org.ehcache.config.CacheConfiguration;
import org.ehcache.config.ResourcePools;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.config.units.EntryUnit;
import org.ehcache.config.units.MemoryUnit;
import org.ehcache.core.config.DefaultConfiguration;
import org.ehcache.jsr107.EhcacheCachingProvider;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.jcache.JCacheCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableCaching
public class CacheConfig {


    @Bean
    public JCacheCacheManager jCacheCacheManager() {
        JCacheCacheManager jCacheManager = new JCacheCacheManager(cacheManager());
        return jCacheManager;
    }

    @Bean(destroyMethod = "close")
    public CacheManager cacheManager() {

        ResourcePools resourcePools = ResourcePoolsBuilder.newResourcePoolsBuilder()
                .heap(2000, EntryUnit.ENTRIES)
                .offheap(100, MemoryUnit.MB)
                .build();


        CacheConfiguration<Object,Object> cacheConfiguration = CacheConfigurationBuilder.newCacheConfigurationBuilder(
                Object.class,
                Object.class,
                resourcePools).
                build();

        Map<String, CacheConfiguration<?, ?>> caches = new HashMap<>();
        caches.put("myCache", cacheConfiguration);

        EhcacheCachingProvider provider = (EhcacheCachingProvider) Caching.getCachingProvider("org.ehcache.jsr107.EhcacheCachingProvider");
        org.ehcache.config.Configuration configuration = new DefaultConfiguration(caches, provider.getDefaultClassLoader());

        return  provider.getCacheManager(provider.getDefaultURI(), (org.ehcache.config.Configuration) configuration);
    }

}

如果您使用的是 spring-boot，它应该为您自动配置 JCacheCacheManager。然后您可以使用JCacheManagerCustomizer 来配置缓存。

【讨论】：