package org.apache.solr.core;
/**
* 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.
*/
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MMapDirectory;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
/**
* Directly provide MMapDirectory instead of relying on {@link org.apache.lucene.store.FSDirectory#open}
*
* Can set the following parameters:
* <ul>
* <li>unmap -- See {@link org.apache.lucene.store.MMapDirectory#setUseUnmap(boolean)}</li>
* <li>maxChunkSize -- The Max chunk size. See {@link org.apache.lucene.store.MMapDirectory#setMaxChunkSize(int)}</li>
* </ul>
*
**/
public class MMapDirectoryFactory extends DirectoryFactory {
private transient static Logger log = LoggerFactory.getLogger(MMapDirectoryFactory.class);
boolean unmapHack;
private int maxChunk;
@Override
public Directory open(String path) throws IOException {
MMapDirectory mapDirectory = new MMapDirectory(new File(path));
try {
mapDirectory.setUseUnmap(unmapHack);
} catch (Exception e) {
log.warn("Unmap not supported on this JVM, continuing on without setting unmap", e);
}
mapDirectory.setMaxChunkSize(maxChunk);
return mapDirectory;
}
@Override
public void init(NamedList args) {
SolrParams params = SolrParams.toSolrParams( args );
maxChunk = params.getInt("maxChunkSize", MMapDirectory.DEFAULT_MAX_BUFF);
if (maxChunk <= 0){
throw new IllegalArgumentException("maxChunk must be greater than 0");
}
unmapHack = params.getBool("unmap", true);
}
}