/*
* 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.
*/
package org.apache.uima.lucas.indexer;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.HashSet;
import java.util.Properties;
import java.util.Random;
import java.util.Set;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriter.MaxFieldLength;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.uima.resource.DataResource;
import org.apache.uima.resource.ResourceInitializationException;
import org.apache.uima.resource.SharedResourceObject;
public class IndexWriterProviderImpl implements IndexWriterProvider, SharedResourceObject{
public static final String USE_COMPOUND_FILE_FORMAT_PROPERTY = "useCompoundFileFormat";
public static final String RAMBUFFER_SIZE_PROPERTY = "RAMBufferSize";
public static final String INDEX_PATH_PROPERTY = "indexPath";
public static final String MAX_FIELD_LENGTH_PROPERTY = "maxFieldLength";
private static final String UNIQUE_INDEX_PROPERTY = "uniqueIndex";
private static Set<Integer> randomNumbers = new HashSet<Integer>();
public IndexWriter indexWriter;
public IndexWriter getIndexWriter() {
return indexWriter;
}
public void load(DataResource dataResource) throws ResourceInitializationException {
Properties properties = loadProperties(dataResource);
String indexPath = getIndexPath(properties);
if (getUniqueIndexOrDefault(properties))
indexPath = createUniqueIndexPath(indexPath);
MaxFieldLength maxFieldLength = getMaxFieldLengthOrDefault(properties);
createIndexWriter(indexPath, maxFieldLength);
Double ramBufferSize = getRAMBufferSizeOrDefault(properties);
Boolean useCompoundFileFormat = getUseCompoundFormatOrDefault(properties);
configureIndexWriter(ramBufferSize, useCompoundFileFormat);
}
private Properties loadProperties(DataResource dataResource)
throws ResourceInitializationException {
Properties properties = new Properties();
try {
properties.load(dataResource.getInputStream());
} catch (IOException e) {
throw new ResourceInitializationException(e);
}
return properties;
}
private Boolean getUseCompoundFormatOrDefault(Properties properties) {
String useCompoundFileFormatAsString = properties.getProperty(USE_COMPOUND_FILE_FORMAT_PROPERTY);
Boolean useCompoundFileFormat = true;
if( useCompoundFileFormatAsString != null )
useCompoundFileFormat = new Boolean(useCompoundFileFormatAsString);
return useCompoundFileFormat;
}
private String getIndexPath(Properties properties){
return properties.getProperty(INDEX_PATH_PROPERTY);
}
private synchronized int createRandom() {
Random randomGenerator = new Random();
int randomInt = randomGenerator.nextInt(1000000);
while (randomNumbers.contains(randomInt)) {
randomInt = randomGenerator.nextInt(1000000);
}
randomNumbers.add(randomInt);
return randomInt;
}
private String createUniqueIndexPath(String indexPath){
String uniqueIndexPath = indexPath + "-" + getHostName() + "-" + getPID() +
"-" + createRandom();
return uniqueIndexPath;
}
private Boolean getUniqueIndexOrDefault(Properties properties) {
String uniqueIndexAsString = properties.getProperty(UNIQUE_INDEX_PROPERTY);
Boolean uniqueIndex = false;
if( uniqueIndexAsString != null )
uniqueIndex = new Boolean(uniqueIndexAsString);
return uniqueIndex;
}
private Double getRAMBufferSizeOrDefault(Properties properties) {
String ramBufferSizeAsString = properties.getProperty(RAMBUFFER_SIZE_PROPERTY);
Double ramBufferSize = IndexWriter.DEFAULT_RAM_BUFFER_SIZE_MB;
if( ramBufferSizeAsString != null )
ramBufferSize = new Double(ramBufferSizeAsString);
return ramBufferSize;
}
private MaxFieldLength getMaxFieldLengthOrDefault(Properties properties) {
String maxFieldLengthAsString = properties.getProperty(MAX_FIELD_LENGTH_PROPERTY);
if( maxFieldLengthAsString == null )
return IndexWriter.MaxFieldLength.UNLIMITED;
else{
Integer maxFieldLength = new Integer(maxFieldLengthAsString);
return new MaxFieldLength(maxFieldLength);
}
}
private void createIndexWriter(String indexPath, MaxFieldLength maxFieldLength) throws ResourceInitializationException {
try {
indexWriter = new IndexWriter(indexPath, new StandardAnalyzer(), true, maxFieldLength);
} catch (CorruptIndexException e) {
throw new ResourceInitializationException(e);
} catch (LockObtainFailedException e) {
throw new ResourceInitializationException(e);
} catch (IOException e) {
throw new ResourceInitializationException(e); }
}
private void configureIndexWriter(Double ramBufferSize, Boolean useCompoundFileFormat) {
indexWriter.setRAMBufferSizeMB(ramBufferSize);
indexWriter.setUseCompoundFile(true);
}
private String getPID() {
String id = ManagementFactory.getRuntimeMXBean().getName();
return id.substring(0, id.indexOf("@"));
}
private String getHostName() {
InetAddress address;
String hostName;
try {
address = InetAddress.getLocalHost();
hostName = address.getHostName();
} catch (UnknownHostException e) {
throw new IllegalStateException(e);
}
return hostName;
}
}