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// $Id$
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/**
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* Copyright (C) 2015 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package org.bgbm.biovel.drf.store;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import org.apache.jena.query.Dataset;
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import org.apache.jena.query.ReadWrite;
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import org.apache.jena.rdf.model.Model;
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import org.apache.jena.tdb.TDBFactory;
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import org.apache.jena.tdb.base.file.Location;
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/**
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* @author a.kohlbecker
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* @date Oct 19, 2015
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*
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*/
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public class TDBStore extends Store {
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private Dataset dataset = null;
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/**
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* @throws Exception
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*/
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public TDBStore() throws Exception {
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super();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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protected String storeName() {
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return "tdb";
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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protected void initStoreEngine() throws Exception {
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Location location = Location.create(storeLocation.toString());
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Dataset dataset = TDBFactory.createDataset(location);
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dataset.begin(ReadWrite.READ) ;
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// Get model inside the transaction
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Model model = dataset.getDefaultModel() ;
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logger.info("Dataset in TDB has " + dataset.asDatasetGraph().size() + " named graphs");
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logger.info("Model-size: " + model.size());
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dataset.end();
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}
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/**
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* WARNING!!! This needs at least 1.5GB of heap space!!!
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* set -Xmx1500M
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*
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* NOTE: The bulkloader is a faster way to load data into an empty dataset than just using the Jena update operations.
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* the bulkloader also requires less memory
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* It is accessed through the command line utility tdbloader.
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*
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* rm /tmp/drf_tnb_store/*; bin/tdbloader2 -l /tmp/drf_tnb_store /tmp/species.rdf
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* @throws IOException
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*/
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@Override
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protected void load(File rdfFile) throws IOException {
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logger.info("Using TDB store at " + storeLocation);
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dataset.begin(ReadWrite.WRITE);
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Model model = dataset.getDefaultModel();
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// parse InputStream as RDF in Turtle format
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InputStream fin = new FileInputStream(rdfFile);
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logger.info("loading RDF/XML into TDB store");
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model.read(fin, null, "RDF/XML");
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logger.info("loading RDF/XML done");
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logger.info("Dataset in TDB has " + dataset.asDatasetGraph().size() + " named graphs");
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logger.info("Model-size: " + model.size());
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dataset.commit();
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dataset.end();
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logger.info("rdf loaded into TDB store at " + storeLocation);
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this.setDataset(dataset);
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}
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/**
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* @return the dataset
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*/
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public Dataset getDataset() {
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return dataset;
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}
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/**
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* @param dataset the dataset to set
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*/
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public void setDataset(Dataset dataset) {
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this.dataset = dataset;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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protected void stopStoreEngine() throws Exception {
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// TODO Auto-generated method stub
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}
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}
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