Metacat

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

import java.sql.SQLException;

import java.util.Collection;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

import org.apache.log4j.Logger;

import org.dataone.service.exceptions.InvalidSystemMetadata;

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

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

import com.hazelcast.core.MapLoader;

import com.hazelcast.core.MapStore;

import edu.ucsb.nceas.metacat.IdentifierManager;

import edu.ucsb.nceas.metacat.McdbDocNotFoundException;

/**

 * Storage implementation for Hazelcast System Metadata

 * @author leinfelder

 *

 */

public class SystemMetadataMap 

    implements MapStore<Identifier, SystemMetadata>, MapLoader<Identifier, SystemMetadata> {

  private Logger logMetacat = Logger.getLogger(SystemMetadataMap.class);

	@Override

	public void delete(Identifier arg0) {

		// we do not delete system metadata

	}

	@Override

	public void deleteAll(Collection<Identifier> arg0) {

		// we do not delete system metadata	

	}

	@Override

	public void store(Identifier pid, SystemMetadata sm) {

		try {

			logMetacat.debug("Storing System Metadata to store: " + pid.getValue());

			IdentifierManager.getInstance().insertOrUpdateSystemMetadata(sm);

		} catch (McdbDocNotFoundException e) {

			throw new RuntimeException(e.getMessage(), e);

		} catch (SQLException e) {

	      throw new RuntimeException(e.getMessage(), e);

    } catch (InvalidSystemMetadata e) {

        throw new RuntimeException(e.getMessage(), e);

        }

	}

	@Override

	public void storeAll(Map<Identifier, SystemMetadata> map) {

		for (Identifier key: map.keySet()) {

			store(key, map.get(key));

		}

	}

	@Override

	public SystemMetadata load(Identifier pid) {

		SystemMetadata sm = null;

    try {

			logMetacat.debug("loading from store: " + pid.getValue());

			sm = IdentifierManager.getInstance().getSystemMetadata(pid.getValue());

		} catch (McdbDocNotFoundException e) {

			//throw new RuntimeException(e.getMessage(), e);

			// not found => null

			return null;

		}

		catch (Exception e) {

			throw new RuntimeException(e.getMessage(), e);

		}

		return sm;

	}

	@Override

	public Map<Identifier, SystemMetadata> loadAll(Collection<Identifier> keys) {

		Map<Identifier, SystemMetadata> map = new HashMap<Identifier, SystemMetadata>();

		for (Identifier key: keys) {

			SystemMetadata value = load(key);

			map.put(key, value);

		}

		return map;

	}

	/**

	 * Returning null so that no entries are loaded on map initialization

	 * 

	 * @see http://www.hazelcast.com/docs/1.9.4/manual/single_html/#Map

	 * 

	 * As of 1.9.3 MapLoader has the new MapLoader.loadAllKeys API. 

	 * It is used for pre-populating the in-memory map when the map is first touched/used. 

	 * If MapLoader.loadAllKeys returns NULL then nothing will be loaded. 

	 * Your MapLoader.loadAllKeys implementation can return all or some of the keys. 

	 * You may select and return only the hot keys, for instance. 

	 * Also note that this is the fastest way of pre-populating the map as 

	 * Hazelcast will optimize the loading process by having each node loading owned portion of the entries.

	 */

	@Override

	public Set<Identifier> loadAllKeys() {

		return null;

	}

}