org.codelibs.elasticsearch.taste.recommender.svd.PersistenceStrategy Maven / Gradle / Ivy
/**
* 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.codelibs.elasticsearch.taste.recommender.svd;
import java.io.IOException;
/**
* Provides storage for {@link Factorization}s
*/
public interface PersistenceStrategy {
/**
* Load a factorization from a persistent store.
*
* @return a Factorization or null if the persistent store is empty.
*
* @throws IOException
*/
Factorization load() throws IOException;
/**
* Write a factorization to a persistent store unless it already
* contains an identical factorization.
*
* @param factorization
*
* @throws IOException
*/
void maybePersist(Factorization factorization) throws IOException;
}