如何在沒有xml的情況下使用spring boot 2和ehcache 3？

Question

現在我有以下配置：

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

它指的是以下 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>

服務看起來像這樣：

@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，但我想擺脫 xml 配置。

我已經閱讀並嘗試應用以下答案（最后一段代碼）但它僅適用於 Ehcache 2 但我將使用 Eehcache 3

我怎樣才能實現它？

Answer 1

由於 EhCache 似乎與 JSR-107 兼容，您需要以這種方式使用它來進行編程配置：

@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;
}

自己還沒有測試過，但這應該對你有用。

查看此編程示例，其中包含來自 EhCache 存儲庫的更多配置選項以及有關如何以編程方式注冊偵聽器的文檔部分。

Answer 2

這是我的解決方案

@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;
}

相當於：

<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.paynow.card.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>