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Feedzai Open Scoring Server - Weka Implementation
/*
* $#
* FOS Weka
*
* Copyright (C) 2013 Feedzai SA
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program. If not, see
* .
* #$
*/
package com.feedzai.fos.impl.weka.utils.pool;
import com.feedzai.fos.common.validation.NotNull;
import com.feedzai.fos.impl.weka.exception.WekaClassifierException;
import org.apache.commons.pool.BasePoolableObjectFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import weka.classifiers.Classifier;
import java.io.*;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* The Classifier Factory.
* This factory is used to backup the {@link org.apache.commons.pool.ObjectPool} object life cycle.
*
* @author Rafael Marmelo
*/
public class ClassifierFactory extends BasePoolableObjectFactory {
private static final Logger logger = LoggerFactory.getLogger(ClassifierFactory.class);
private File modelPath;
/**
* Create a new classifier factory using the given cloner.
*
* @param modelPath The path to the model.
*/
public ClassifierFactory(File modelPath) {
checkNotNull(modelPath, "The path cannot be null");
checkArgument(modelPath.exists(), "The model must exist");
checkArgument(modelPath.canRead(), "The model must be readable.");
this.modelPath = modelPath;
}
/**
* Make on object of the factory type.
*
* Uses the cloner to create a new instance.
*
* @return a new object of the specified type
* @throws WekaClassifierException when the object could not be clonned
*/
@Override
@NotNull
public Classifier makeObject() throws WekaClassifierException {
logger.debug("Creating classifier");
long time = System.currentTimeMillis();
try (FileInputStream fileInputStream = new FileInputStream(this.modelPath);
BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream, 1024 * 1024);
ObjectInputStream objectInputStream = new ObjectInputStream(bufferedInputStream)) {
Classifier classifier = (Classifier) objectInputStream.readObject();
logger.debug("Loaded model {} in {} ms.", this.modelPath, (System.currentTimeMillis() - time));
return classifier;
} catch (IOException e) {
throw new WekaClassifierException(e);
} catch (ClassNotFoundException e) {
throw new WekaClassifierException(e);
}
}
}
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