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package kim.sesame.framework.cache;


import kim.sesame.framework.cache.exception.CacheConfigException;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


/**
* Description: 对缓存进行门面处理，所有的缓存策略通过应用根据场景去适配 应用只用实现对应的DataProvider 即可
*/
public final class CacheManager {

	@SuppressWarnings("rawtypes")
	private static final CacheManager INSTANCE = new CacheManager();

	/**
	 * 保存所有缓存实例
	 */
	private final Map> uuidCaches = new ConcurrentHashMap>();

	/**
	 *  禁止从外部拿到实例
	  * 创建一个新的实例 CacheManager.
	  * @since 0.6
	 */
	private CacheManager() {
	}

	@SuppressWarnings("rawtypes")
	public static CacheManager getInstance() {
		return INSTANCE;
	}

	/**
	 * 系统启动后自动注册所有的缓存类别
	 * 
	 * @param cache cache
	 */
	public void registerCacheProvider(ICache cache) {
		// 不允许UUID重复，应用必须在实现的Cache接口确保命名不重复
		String uuid = cache.getUUID();
		if (uuidCaches.containsKey(uuid)) {
			throw new CacheConfigException("Dumplicate uuid " + uuid
					+ " to cache provider " + cache.getClass().getName()
					+ " and " + uuidCaches.get(uuid).getClass().getName());
		}

		uuidCaches.put(uuid, cache);
	}

	/**
	 * 根据uuid获取缓存实例
	 * @param uuid uuid
	 * @return ICache
	 */
	public ICache getCache(String uuid) {
		ICache cache = uuidCaches.get(uuid);
		if (cache == null) {
			throw new CacheConfigException(
					"No register cache provider for cache UUID " + uuid);
		}
		return cache;
	}


	public void shutdown() {
		uuidCaches.clear();
	}
}