package com.yiidata.intergration.web.modules.sys.cache;


import com.google.common.collect.ImmutableSet;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;


/**
 *
 * 支持缓存， @Cacheable 注解。
 *
 * CAcheManager 无须自己 shutdown，创建 该 Cache 的 Factory 在销毁是会 shutdown
 *
 * <pre>
 *
 * User: zhenqin
 * Date: 14/11/9
 * Time: 10:43
 *
 * </pre>
 *
 * @author zhenqin
 */
@Component("cacheManager")
public class ICacheManager implements CacheManager {


    /**
     * 支持 cacheManager 的缓存
     */
    @Resource
    private ICache cache;


    /**
     * 已经获得的缓存
     */
    private Set<String> cacheNames = new HashSet<>();


    /**
     * Construct a dynamic ICacheManager,
     * lazily creating cache instances as they are being requested.
     */
    public ICacheManager() {
    }

    /**
     * 支持的 缓存 名称
     * @return
     */
    @Override
    public Collection<String> getCacheNames() {
        return ImmutableSet.copyOf(cacheNames);
    }

    @Override
    public Cache getCache(String name) {
        if(!cacheNames.contains(name)) {
            // 如果 cacheNames 中没有，说明是新建的
            cacheNames.add(name);
        }
        return new ProxyCache(cache);
    }


    public void setCache(ICache cache) {
        this.cache = cache;
    }
}