package org.gcube.application.framework.core.cache;

import java.util.HashMap;
//import org.gcube.common.core.scope.GCUBEScope;
//import org.gcube.common.core.utils.logging.GCUBELog;
//import org.gcube.informationsystem.cache.ISCache;
//import org.gcube.informationsystem.cache.ISCacheManager;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;

import org.gcube.informationsystem.cache.ISCache;
import org.gcube.informationsystem.cache.ISCacheManager;
import org.gcube.resources.discovery.icclient.ICClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * This class manages the running harvester threads.
 * 
 * @author Valia Tsagkalidou (KNUA)
 *
 */

public class RIsManager {

	
	/**
	 * Defines the manager's instance
	 */
	private static RIsManager instance = null;
	
	/**
	 * keeps the ISCache per scope
	 */
	
//	protected HashMap<String, ISCache> isCaches;
	
	protected HashMap<String, ISCache> caches;  //(scope,iccache) pairs

	/** Object logger. */
	
	protected static final Logger logger = LoggerFactory.getLogger(RIsManager.class);
	
	/**
	 * Initializes RIsManager 
	 */
	private RIsManager() { 
		caches = new HashMap<String, ISCache>();
	}

	/**
	 * Retrieves the singleton
	 * @return the only instance of RIsManager
	 */
	synchronized public static RIsManager getInstance() {
		if (instance == null)
			instance = new RIsManager();
		return instance;
	}
	
	
	/**
	 * @param scope the GGUBEScope for which the RIs are requested
	 * @return the ISCache for this specific scope
	 */
	public synchronized ISCache getISCache(String scope)
	{
		ISCache info = caches.get(scope);
		
// TODO: UNCOMMENT when ISCache is FeatherWeight Stack compatible
		
//		if(info == null)
//		{
//			// If the ISCache in not already created, then it creates a new instance and adds it to the HashMap 
//			try {
//				ISCacheManager.addManager(scope);
//				info = ISCacheManager.getCacheManager(scope).getManager(scope).getCache();
//				caches.put(scope, info);
//				try {
//					Thread.sleep(5000);
//				} catch (InterruptedException e1) {
//					logger.error("", e1);
//				}
//			} catch (Exception e) {
//				logger.error("", e);
//			}
//		}
		
		logger.debug("RI in cache is probably null");
		logger.info("RI in cache is probably null");
		
		return info;
	}

}