/*
* Copyright 2010 Bizosys Technologies Limited
*
* Licensed to the Bizosys Technologies Limited (Bizosys) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The Bizosys 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 com.bizosys.hsearch.inpipe.util;
import java.io.IOException;
import java.util.List;
import java.util.Set;
import org.apache.lucene.analysis.StopFilter;
import com.bizosys.oneline.ApplicationFault;
import com.bizosys.oneline.SystemFault;
import com.bizosys.oneline.services.batch.BatchTask;
import com.bizosys.oneline.util.StringUtils;
import com.bizosys.hsearch.dictionary.DictLog;
import com.bizosys.hsearch.filter.IStorable;
import com.bizosys.hsearch.filter.Storable;
import com.bizosys.hsearch.hbase.HReader;
import com.bizosys.hsearch.hbase.HWriter;
import com.bizosys.hsearch.hbase.NV;
import com.bizosys.hsearch.inpipe.InpipeLog;
import com.bizosys.hsearch.schema.IOConstants;
import com.bizosys.hsearch.util.LuceneConstants;
import com.bizosys.hsearch.util.RecordScalar;
/**
* Scheduler stopword refresh task
* @author karan
*
*/
public class StopwordRefresh implements BatchTask {
private static final char STOPWORD_SEPARATOR = '\t';
private static byte[] STOP_WORD_LISTS_KEY = "STOP_WORDS".getBytes();
public String getJobName() {
return "StopWordRefresh";
}
public Object process() throws ApplicationFault, SystemFault {
NV nv = new NV(IOConstants.NAME_VALUE_BYTES, IOConstants.NAME_VALUE_BYTES);
RecordScalar scalar = new RecordScalar(STOP_WORD_LISTS_KEY,nv);
HReader.getScalar(IOConstants.TABLE_CONFIG, scalar);
if ( null != scalar.kv.data) {
String words = new String(scalar.kv.data.toBytes());
List<String> wordLst = StringUtils.fastSplit(words, STOPWORD_SEPARATOR);
if (DictLog.l.isInfoEnabled() ) {
DictLog.l.info("StopwordRefresh task is refreshing stopword lists");
}
StopwordManager.getInstance().stopWords = buildStopwords(wordLst);
}
return null;
}
public void setJobName(String arg0) {
}
/**
* This refreshes the stopword list.
* @param allStopWords
* @return
* @throws ApplicationFault
*/
@SuppressWarnings("unchecked")
private Set<String> buildStopwords(List<String> allStopWords) throws SystemFault{
if ( null == allStopWords) {
InpipeLog.l.warn(" FilterStopWords: No stop words." );
return null;
}
try {
Set wordSet = StopFilter.makeStopSet(LuceneConstants.version, allStopWords);
if (InpipeLog.l.isInfoEnabled()) {
InpipeLog.l.info(" StopwordManager: stopWords.size - " + wordSet.size());
}
return (Set<String>) wordSet;
} catch (Exception ex) {
throw new SystemFault(ex);
}
}
public static void add(List<String> lstWord, boolean concurrency) throws SystemFault{
if ( null == lstWord) return;
IStorable wordB = new Storable(
StringUtils.listToString(lstWord, STOPWORD_SEPARATOR));
NV nv = new NV(
IOConstants.NAME_VALUE_BYTES, IOConstants.NAME_VALUE_BYTES,wordB);
RecordScalar scalar = new RecordScalar(STOP_WORD_LISTS_KEY,nv);
try {
HWriter.getInstance(concurrency).insertScalar(IOConstants.TABLE_CONFIG, scalar);
} catch (IOException ex) {
InpipeLog.l.fatal("StopwordRefresh > ", ex);
throw new SystemFault(ex);
}
}
}