Example usage for org.apache.mahout.cf.taste.impl.common RefreshHelper RefreshHelper

Introduction

In this page you can find the example usage for org.apache.mahout.cf.taste.impl.common RefreshHelper RefreshHelper.

Prototype

public RefreshHelper(Callable<?> refreshRunnable) 

Source Link

Usage

From source file:recommender.MyRecommender.java

/**
 * Create a custom SVDRecommender using a persistent store to cache
 * factorizations. A factorization is loaded from the store if present,
 * otherwise a new factorization is computed and saved in the store.
 *
 * The {@link #refresh(java.util.Collection) refresh} method recomputes the
 * factorization and overwrites the store.
 *
 * @param dataModel/*from   w ww.  java2s  . c o  m*/
 * @param factorizer
 * @param candidateItemsStrategy
 * @param persistenceStrategy
 *
 * @throws TasteException
 */
public MyRecommender(DataModel dataModel, Factorizer factorizer, CandidateItemsStrategy candidateItemsStrategy,
        PersistenceStrategy persistenceStrategy) throws TasteException {
    super(dataModel, candidateItemsStrategy);
    this.factorizer = Preconditions.checkNotNull(factorizer);
    this.persistenceStrategy = Preconditions.checkNotNull(persistenceStrategy);
    try {
        factorization = persistenceStrategy.load();
    } catch (IOException e) {
        throw new TasteException("Error loading factorization", e);
    }

    if (factorization == null) {
        train();
    }

    refreshHelper = new RefreshHelper(new Callable<Object>() {
        @Override
        public Object call() throws TasteException {
            train();
            return null;
        }
    });
    refreshHelper.addDependency(getDataModel());
    refreshHelper.addDependency(factorizer);
    refreshHelper.addDependency(candidateItemsStrategy);
}

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From source file:recommender.ReloadFromJDBCDataModelCustom.java

License:Apache License

public ReloadFromJDBCDataModelCustom(JDBCDataModel delegate) throws TasteException {
    this.delegate = Preconditions.checkNotNull(delegate);
    refreshHelper = new RefreshHelper(new Callable<Void>() {
        @Override/*  w  ww.j  a  va2s.c  o  m*/
        public Void call() {
            reload();
            return null; //To change body of implemented methods use File | Settings | File Templates.
        }
    });
    refreshHelper.addDependency(delegate);
    reload();
    if (delegateInMemory == null) {
        throw new TasteException("Failed to load data into memory");
    }
}

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