缓存扩展

<dubbo:service cache="lru" />
<!-- 方法级缓存 -->
<dubbo:service><dubbo:method cache="lru" /></dubbo:service> 
<!-- 缺省值设置，当<dubbo:service>没有配置cache属性时，使用此配置 -->
<dubbo:provider cache="xxx,yyy" /> 

src
 |-main
    |-java
        |-com
            |-xxx
                |-XxxCacheFactory.java (实现CacheFactory接口)
    |-resources
        |-META-INF
            |-dubbo
                |-org.apache.dubbo.cache.CacheFactory (纯文本文件，内容为：xxx=com.xxx.XxxCacheFactory)

package com.xxx;
 
import org.apache.dubbo.cache.CacheFactory;
 
public class XxxCacheFactory implements CacheFactory {
    public Cache getCache(URL url, String name) {
        return new XxxCache(url, name);
    }
}

package com.xxx;
 
import org.apache.dubbo.cache.Cache;
 
public class XxxCache implements Cache {
    public Cache(URL url, String name) {
        // ...
    }
    public void put(Object key, Object value) {
        // ...
    }
    public Object get(Object key) {
        // ...
    }
}

xxx=com.xxx.XxxCacheFactory