6

现在我有以下配置：

@Configuration
@EnableCaching
public class EhcacheConfig {
    @Bean
    public CacheManager cacheManager() throws URISyntaxException {
        return new JCacheCacheManager(Caching.getCachingProvider().getCacheManager(
                getClass().getResource("/ehcache.xml").toURI(),
                getClass().getClassLoader()
        ));
    }
}

它引用以下 XML：

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://www.ehcache.org/v3"
        xmlns:jsr107="http://www.ehcache.org/v3/jsr107"
        xsi:schemaLocation="
            http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
            http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">

    <cache alias="pow_cache">
        <key-type>org.springframework.cache.interceptor.SimpleKey</key-type>
        <value-type>java.lang.Double</value-type>
        <expiry>
            <ttl unit="seconds">15</ttl>
        </expiry>

        <listeners>
            <listener>
                <class>my.pack.CacheEventLogger</class>
                <event-firing-mode>ASYNCHRONOUS</event-firing-mode>
                <event-ordering-mode>UNORDERED</event-ordering-mode>
                <events-to-fire-on>CREATED</events-to-fire-on>
                <events-to-fire-on>EXPIRED</events-to-fire-on>
            </listener>
        </listeners>

        <resources>
            <heap unit="entries">2</heap>
            <offheap unit="MB">10</offheap>
        </resources>
    </cache>

</config>

服务看起来像这样：

@Cacheable(value = "pow_cache", unless = "#pow==3||#result>100", condition = "#val<5")
public Double pow(int val, int pow) throws InterruptedException {
    System.out.println(String.format("REAL invocation myService.pow(%s, %s)", val, pow));
    Thread.sleep(3000);
    return Math.pow(val, pow);
}

它工作正常，但我想摆脱 xml 配置。

我已阅读并尝试应用以下答案（最后一段代码）但它仅适用于 Ehcache 2 但我将使用 Eehcache 3

我怎样才能实现它？

4

2 回答 2

9

由于 EhCache似乎与 JSR-107 兼容，因此您需要以这种方式使用它来进行编程配置：

@Bean
public CacheManager cacheManager() throws URISyntaxException {
    CachingProvider provider = Caching.getCachingProvider();  
    CacheManager cacheManager = provider.getCacheManager();   

    CacheConfigurationBuilder<SimpleKey, Double> configuration = 
    CacheConfigurationBuilder.newCacheConfigurationBuilder(org.springframework.cache.interceptor.SimpleKey.class,
        java.lang.Double.class, 
        ResourcePoolsBuilder.heap(2).offheap(10, MemoryUnit.MB))
        .withExpiry(Expirations.timeToLiveExpiration(new Duration(15, TimeUnit.SECONDS)));

    Cache cache = cacheManager.createCache("pow_cache", configuration);
    cache.getRuntimeConfiguration().registerCacheEventListener(listener, EventOrdering.UNORDERED,
        EventFiring.ASYNCHRONOUS, EnumSet.of(EventType.CREATED, EventType.EXPIRED)); 
    return cacheManager;
}

自己没有测试过，但这应该对你有用。

查看这个程序示例，其中包含来自 EhCache 存储库的更多配置选项以及有关如何以编程方式注册侦听器的文档部分。

于 2019-09-16T14:34:27.247 回答
6

这是我的解决方案

@Bean
CacheManager getCacheManager() {

    CachingProvider provider = Caching.getCachingProvider();
    CacheManager cacheManager = provider.getCacheManager();

    CacheConfigurationBuilder<String, String> configurationBuilder =
            CacheConfigurationBuilder.newCacheConfigurationBuilder(
                    String.class, String.class,
                    ResourcePoolsBuilder.heap(1000)
                                        .offheap(25, MemoryUnit.MB))
                                     .withExpiry(ExpiryPolicyBuilder.timeToLiveExpiration(Duration.ofHours(3)));

    CacheEventListenerConfigurationBuilder asynchronousListener = CacheEventListenerConfigurationBuilder
            .newEventListenerConfiguration(new CacheEventLogger()
                    , EventType.CREATED, EventType.EXPIRED).unordered().asynchronous();

    //create caches we need
    cacheManager.createCache("productCatalogConfig",
                             Eh107Configuration.fromEhcacheCacheConfiguration(configurationBuilder.withService(asynchronousListener)));

    return cacheManager;
}

相当于：

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.ehcache.org/v3"
    xmlns:jsr107="http://www.ehcache.org/v3/jsr107"
    xsi:schemaLocation="
        http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
        http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">

<cache alias="productCatalogConfig">
    <key-type>java.lang.String</key-type>
    <value-type>java.lang.String</value-type>
    <expiry>
        <ttl unit="seconds">1600</ttl>
    </expiry>

    <listeners>
        <listener>
            <class>com.klarna.config.CacheEventLogger</class>
            <event-firing-mode>ASYNCHRONOUS</event-firing-mode>
            <event-ordering-mode>UNORDERED</event-ordering-mode>
            <events-to-fire-on>CREATED</events-to-fire-on>
            <events-to-fire-on>EXPIRED</events-to-fire-on>
        </listener>
    </listeners>

    <resources>
        <heap unit="entries">1000</heap>
        <offheap unit="MB">25</offheap>
    </resources>
</cache>
于 2020-09-29T15:46:11.930 回答