使用 spring 自定义 ehcache 驱逐策略

Question

如果我们想要自定义除 LRU LFU FIFO 之外的逐出策略，文档建议的方法是实现接口 Policy，然后设置 MemoryStoreEvictionPolicy，如下所示：

manager = new CacheManager(EHCACHE_CONFIG_LOCATION);
cache = manager.getCache(CACHE_NAME);
cache.setMemoryStoreEvictionPolicy(new MyPolicy());

但是如果我使用 spring，请使用 @cacheable 和 xml 文件，例如

<bean id="cacheManagerFactory" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
    <property name="configLocation" value="classpath:ehcache.xml" ></property>
</bean>


<!-- cacheManager -->
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
    <property name="cacheManager" ref="cacheManagerFactory" />
</bean>

如何在 Spring Way 中注入自己的策略？

谢谢大家

Answer 1

您最好实现自己的类，在 Spring 初始化时设置缓存的逐出策略。

例如：

public class MyEvictionPolicySetter implements InitializingBean {

    public static final String CACHE_NAME = "my_cache";

    private CacheManager manager;
    private Policy evictionPolicy;

    @Override
    public void afterPropertiesSet() {
        Cache cache = manager.getCache(CACHE_NAME);
        cache.setMemoryStoreEvictionPolicy(evictionPolicy);
    }

    public void setCacheManager(CacheManager manager) {
        this.manager = manager;
    }

    public void setEvictionPolicy(Policy evictionPolicy) {
        this.evictionPolicy = evictionPolicy;
    }
}

然后在你的 Spring 配置中：

<bean id="cacheManagerFactory" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
    <property name="configLocation" value="classpath:ehcache.xml" ></property>
</bean>

<!-- Specify your eviction policy as a Spring bean -->
<bean id="evictionPolicy" class="MyPolicy"/>

<!-- This will set the eviction policy when Spring starts up -->
<bean id="evictionPolicySetter" class="EvictionPolicySetter">
    <property name="cacheManager" ref="cacheManagerFactory"/>
    <property name="evictionPolicy" ref="evictionPolicy"/>
</bean>