org.neo4j.kernel.api.impl.index.IndexWriterFactories.java Source code

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Here is the source code for org.neo4j.kernel.api.impl.index.IndexWriterFactories.java

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/**
 * Copyright (c) 2002-2014 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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 <http://www.gnu.org/licenses/>.
 */
package org.neo4j.kernel.api.impl.index;

import java.io.IOException;

import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.LogByteSizeMergePolicy;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.Version;
import org.neo4j.index.impl.lucene.LuceneDataSource;
import org.neo4j.index.impl.lucene.MultipleBackupDeletionPolicy;

public class IndexWriterFactories {
    public static LuceneIndexWriterFactory standard() {
        return new LuceneIndexWriterFactory() {
            @Override
            public IndexWriter create(Directory directory) throws IOException {
                IndexWriterConfig writerConfig = new IndexWriterConfig(Version.LUCENE_36,
                        LuceneDataSource.KEYWORD_ANALYZER);
                writerConfig.setMaxBufferedDocs(100000); // TODO figure out depending on environment?
                writerConfig.setIndexDeletionPolicy(new MultipleBackupDeletionPolicy());
                writerConfig.setTermIndexInterval(14);

                LogByteSizeMergePolicy mergePolicy = new LogByteSizeMergePolicy();
                mergePolicy.setUseCompoundFile(true);
                mergePolicy.setNoCFSRatio(1.0);
                mergePolicy.setMinMergeMB(0.1);
                mergePolicy.setMergeFactor(2);
                writerConfig.setMergePolicy(mergePolicy);

                return new IndexWriter(directory, writerConfig);
            }
        };
    }
}