Metacat

package edu.ucsb.nceas.metacat.dataone.hazelcast;

import java.util.Collection;

import java.util.Collections;

import java.util.HashSet;

import java.util.Hashtable;

import java.util.List;

import java.util.Map;

import java.util.Set;

import org.dataone.service.types.v1.Identifier;

import com.hazelcast.core.MapLoader;

import edu.ucsb.nceas.metacat.IdentifierManager;

import edu.ucsb.nceas.metacat.McdbDocNotFoundException;

import edu.ucsb.nceas.metacat.properties.PropertyService;

import edu.ucsb.nceas.metacat.shared.ServiceException;

import edu.ucsb.nceas.utilities.FileUtil;

import edu.ucsb.nceas.utilities.PropertyNotFoundException;

/**

 * MapLoader implementation for a hazelcast hzObjectPath.  This class is called

 * when the ObjectPathMap needs to refresh against the persistent data-store.

 * The use case for this class is to communicate the filepath between JVMs on

 * the same machine, specifically between the metacat instance and the d1_indexer.

 * 

 * d1_indexer will get Identifiers from elsewhere, but use this class to get

 * the paths to their associated files.  The getAllKeys() method can (and should)

 * return null in a live setting.  For unit testing, it may be useful to use

 * it to get some 

 * 

 * @author rnahf

 *

 */

public class ObjectPathMap implements MapLoader<Identifier, String> {

	private static IdentifierManager im;

	private static String dataPath;

	private static String metadataPath;

	private static boolean hasDataStore;

	/**

	 * creates an ObjectPathMap

	 */

	public ObjectPathMap() {

//		try {

//			PropertyService ps = PropertyService.getInstance();

//			dataPath = PropertyService.getProperty("application.datafilepath");

//			metadataPath = PropertyService.getProperty("application.documentfilepath");

//		} catch (PropertyNotFoundException e) {

//			// TODO Auto-generated catch block

//			e.printStackTrace();

//		} catch (ServiceException e) {

//			// TODO Auto-generated catch block

//			e.printStackTrace();

//		}

		dataPath = "/data/";

		metadataPath = "/metadata/";

		im = IdentifierManager.getInstance();

		String role = System.getProperties().getProperty("hazelcast.hzObjectPathRole");

		if (role != null && role.equals("consumer")) {

			hasDataStore = false;

			System.out.println("new instance of ObjectPathMap: role = " + role);

		} else {

			hasDataStore = true;

			System.out.println("new instance of ObjectPathMap: role = " + role);

		}

	}

	/*

	 * Metadata is stored in a different place on the filesystem than

	 * the data.  The doctype value for metadata can vary, but for data

	 * is always 'BIN', so using a simple if-then-else to separate

	 */

	private String pathToDocid(String localid) throws McdbDocNotFoundException  {

		return "/some/path/" + localid; 

//		Hashtable<String, Object> ht = im.getDocumentInfo(localid);

//		if (ht.get("doctype").equals("BIN")) {

//			return dataPath + FileUtil.getFS() + localid;

//		} else {

//			return metadataPath + FileUtil.getFS() + localid;

//		}		

	}

	/**

	 *  Implementation of hazelcast MapLoader interface method.

	 *  For the provided Identifier (as key), returns the path to the

	 *  document on the local filesystem.  Returns null if it can't 

	 *  create the path. 

	 */

	@Override

	public String load(Identifier key) 

	{

		if (hasDataStore) {

			String docid = null;

			String path = null;

//			try {

//				docid = im.getLocalId(key.getValue());

//				path = pathToDocid(docid);			

//			} catch (McdbDocNotFoundException e) {

//				// TODO Auto-generated catch block

//				e.printStackTrace();

//				return null;

//			}

			path = "/path/" + key.getValue();

			return path;

		} else {

			return null;

		}

	}

	/**

	 *  Implementation of hazelcast MapLoader interface method.  This method loads

	 *  mappings for all Identifiers in the parameters.  Any Identifier not found

	 *  is not included in the resulting map.

	 */

	@Override

	public Map<Identifier, String> loadAll(Collection<Identifier> identifiers) {

		if (hasDataStore) {

			Hashtable<Identifier,String> map = new Hashtable<Identifier,String>();

			for (Identifier id : identifiers) {

				map.put(id, "/path/" + id.getValue());

//				try {

//					String docid = im.getLocalId(id.getValue());

//					map.put(id, pathToDocid(docid));

//

//				} catch (McdbDocNotFoundException e) {

//					// TODO should the map load an empty path instead of

//					// leaving out the entire entry?

//					e.printStackTrace();

//				}

			}

			return map;

		} else {

			return null;

		}

	}

	/**

	 * Return the full set of guids in the local metacat repository as

	 * dataone Identifiers.

	 * 

	 * (Hazelcast allows avoiding pre-loading by returning NULL, so consider

	 * re-implementing if that serves the purpose of this class better)

	 */

	@Override

	public Set<Identifier> loadAllKeys() {

		if (hasDataStore) {

			//		List<String> guids = im.getAllGUIDs();

			//		

			Set<Identifier> set = Collections.synchronizedSet(new HashSet<Identifier>());

			//		for (String guid : guids) {

			//			Identifier id = new Identifier();

			//			id.setValue(guid);

			//			set.add(id);

			//		}

			for (int i=1; i< 100; i++) {

				Identifier id = new Identifier();

				id.setValue("testID." + i);

				set.add(id);

			}

			return set;

		} else {

			return null;

		}

	}

}