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Scalable machine learning libraries

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.mahout.cf.taste.model;

import javax.sql.DataSource;

import org.apache.mahout.cf.taste.common.TasteException;
import org.apache.mahout.cf.taste.impl.common.FastByIDMap;
import org.apache.mahout.cf.taste.impl.common.FastIDSet;

public interface JDBCDataModel extends DataModel {
  
  /**
   * @return {@link DataSource} underlying this model
   */
  DataSource getDataSource();
  
  /**
   * Hmm, should this exist elsewhere? seems like most relevant for a DB implementation, which is not in
   * memory, which might want to export to memory.
   * 
   * @return all user preference data
   */
  FastByIDMap exportWithPrefs() throws TasteException;
  
  FastByIDMap exportWithIDsOnly() throws TasteException;
  
}