package org.thrudb.thrudex.lucene;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.log4j.Logger;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.FieldSelector;
import org.apache.lucene.document.MapFieldSelector;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ParallelMultiSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Searchable;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.NIOFSDirectory;
import org.apache.lucene.store.RAMDirectory;
import org.thrudb.thrudex.Element;
import org.thrudb.thrudex.SearchQuery;
import org.thrudb.thrudex.SearchResponse;
import org.thrudb.thrudex.ThrudexException;
import org.thrudb.thrudex.ThrudexExceptionImpl;
public class RealTimeLuceneIndex implements LuceneIndex, Runnable {
Analyzer analyzer = new StandardAnalyzer();
IndexWriter ramWriter;
IndexReader ramReader;
IndexSearcher ramSearcher;
RAMDirectory ramDirectory;
IndexReader prevRamReader;
IndexSearcher prevRamSearcher;
RAMDirectory prevRamDirectory;
IndexWriter diskWriter;
IndexReader diskReader;
IndexSearcher diskSearcher;
Directory diskDirectory;
RealTimeDiskFilter diskFilter;
Set<Term> deletedDocuments; //disk only
AtomicBoolean hasWrite = new AtomicBoolean(false);
CountDownLatch shutdownLatch;
Thread monitor;
Logger logger = Logger.getLogger(getClass());
RealTimeLuceneIndex(String indexRoot, String indexName) throws IOException, ThrudexException {
File rootFile = new File(indexRoot);
if(!rootFile.isDirectory())
throw new IOException("invalid index root: " + indexRoot);
String indexLocation = indexRoot + "/" + indexName;
boolean createIndex = !IndexReader.indexExists(indexLocation);
if(createIndex){
diskWriter = new IndexWriter(indexLocation,analyzer,createIndex,IndexWriter.MaxFieldLength.UNLIMITED);
diskDirectory = NIOFSDirectory.getDirectory(indexLocation);
}else{
diskDirectory = NIOFSDirectory.getDirectory(indexLocation);
if(IndexWriter.isLocked(indexLocation)){
logger.warn("Removing lock on "+indexName);
IndexWriter.unlock(diskDirectory);
}
diskWriter = new IndexWriter(diskDirectory,analyzer,IndexWriter.MaxFieldLength.UNLIMITED);
}
//open this read only
diskReader = IndexReader.open(diskDirectory, true);
diskSearcher = new IndexSearcher(diskReader);
diskFilter = new RealTimeDiskFilter(diskReader);
deletedDocuments = new HashSet<Term>();
//
ramDirectory = new RAMDirectory();
ramWriter = new IndexWriter(ramDirectory,analyzer,true, IndexWriter.MaxFieldLength.UNLIMITED);
ramReader = IndexReader.open(ramDirectory,true);
ramSearcher = new IndexSearcher(ramReader);
//Monitors the index
monitor = new Thread(this);
monitor.start();
}
public synchronized void put(String key, Document document, Analyzer analyzer) throws ThrudexException{
Term term = new Term(DOCUMENT_KEY,key);
try{
ramWriter.updateDocument(term, document, analyzer);
if(diskFilter.hideTerm(term))
deletedDocuments.add(term);
hasWrite.set(true);
}catch(IOException e){
throw new ThrudexExceptionImpl(e.toString());
}
}
public synchronized void remove(String key) throws ThrudexException {
Term term = new Term(DOCUMENT_KEY, key);
try{
ramWriter.deleteDocuments(term);
hasWrite.set(true);
if(diskFilter.hideTerm(term))
deletedDocuments.add(term);
}catch(IOException e){
throw new ThrudexExceptionImpl(e.toString());
}
}
public SearchResponse search(SearchQuery query, Analyzer analyzer) throws ThrudexException {
if(!query.isSetQuery() || query.query.trim().equals(""))
throw new ThrudexExceptionImpl("Empty Query");
//Parse Query
Query parsedQuery;
SearchResponse response = new SearchResponse();
//Construct the multiSearcher
ParallelMultiSearcher multiSearcher = null;
RealTimeDiskFilter myFilter = null;
try{
//This section needs to be thread safe
synchronized(this){
//Commit any prev writes
if(hasWrite.getAndSet(false)){
ramWriter.commit();
//Reopen index reader
IndexReader newReader = ramReader.reopen();
if(ramReader != newReader){
//ramReader.close();
ramSearcher.close();
ramReader = newReader;
ramSearcher = new IndexSearcher(ramReader);
}
}
List<Searchable> searchersList = new ArrayList<Searchable>();
if(ramSearcher.maxDoc() > 0)
searchersList.add(ramSearcher);
if(prevRamSearcher != null && prevRamSearcher.maxDoc() > 0)
searchersList.add(prevRamSearcher);
if(diskSearcher.maxDoc() > 0)
searchersList.add(diskSearcher);
//empty index
if(searchersList.size() == 0)
return response;
Searchable[] searchers = new Searchable[]{};
multiSearcher = new ParallelMultiSearcher(searchersList.toArray(searchers));
myFilter = diskFilter;
}
QueryParser queryParser = new QueryParser(DOCUMENT_KEY, analyzer);
//parse query
//TODO: Cache?
try{
parsedQuery = queryParser.parse(query.getQuery());
}catch(org.apache.lucene.queryParser.ParseException e){
throw new ThrudexExceptionImpl(e.toString());
}
//Set Sort
Sort sortBy = new Sort();
if(query.isSetSortby() && !query.sortby.trim().equals(""))
sortBy.setSort(query.getSortby() + "_sort", query.desc);
//Search
TopDocs result = null;
try{
result = multiSearcher.search(parsedQuery,myFilter,query.offset + query.limit,sortBy);
}catch(Exception e){
logger.debug("Sortby failed, trying non sorted search");
result = multiSearcher.search(parsedQuery,myFilter,query.offset + query.limit);
}
response.setTotal(result.totalHits);
FieldSelector fieldSelector;
if(query.isPayload()){
fieldSelector = new MapFieldSelector(new String[]{DOCUMENT_KEY,PAYLOAD_KEY});
}else{
fieldSelector = new MapFieldSelector(new String[]{DOCUMENT_KEY});
}
for(int i=query.offset; i<result.totalHits && i<(query.offset + query.limit); i++){
Element el = new Element();
el.setIndex(query.index);
Document d = multiSearcher.doc(result.scoreDocs[i].doc,fieldSelector);
el.setKey(d.get(DOCUMENT_KEY));
if(query.isSetPayload() && query.payload)
el.setPayload(d.get(PAYLOAD_KEY));
response.addToElements(el);
}
return response;
}catch(IOException e){
throw new ThrudexException(e.toString());
}
}
public void run() {
while(true){
try{
logger.debug("ram dir size: "+ramDirectory.sizeInBytes());
//do nothing until we have enough changes
if(ramDirectory.sizeInBytes() < 1024*1024*1 && shutdownLatch == null){
Thread.currentThread().sleep(10000);
continue;
}
//We need to merge the indexes together and reopen
synchronized(this){
prevRamDirectory = ramDirectory;
prevRamReader = ramReader;
prevRamSearcher = ramSearcher;
IndexWriter prevRamWriter = ramWriter;
//
ramDirectory = new RAMDirectory();
ramWriter = new IndexWriter(ramDirectory,analyzer,true, IndexWriter.MaxFieldLength.UNLIMITED);
ramReader = IndexReader.open(ramDirectory,true);
ramSearcher = new IndexSearcher(ramReader);
//Commit any prev writes
hasWrite.getAndSet(false);
prevRamWriter.commit();
prevRamWriter.close(); //done forever
//Reopen index reader
IndexReader newReader = prevRamReader.reopen();
if(prevRamReader != prevRamReader){
prevRamReader.close();
prevRamSearcher.close();
prevRamReader = newReader;
prevRamSearcher = new IndexSearcher(prevRamReader);
}
}
//Now write the changes to disk
synchronized(this){
logger.debug("deleted "+deletedDocuments.size()+" documents");
for(Term term : deletedDocuments){
diskWriter.deleteDocuments(term);
}
deletedDocuments.clear();
}
logger.debug("Writing "+prevRamReader.numDocs() + " docs to disk");
//now merge the indexes
diskWriter.addIndexesNoOptimize(new Directory[]{prevRamDirectory});
synchronized(this){
//any new disk updates?
for(Term term : deletedDocuments){
diskWriter.deleteDocuments(term);
}
deletedDocuments.clear();
diskWriter.commit();
diskReader = diskReader.reopen();
diskSearcher = new IndexSearcher(diskReader);
diskFilter = new RealTimeDiskFilter(diskReader);
logger.debug("Have "+diskReader.numDocs()+" docs on disk");
prevRamSearcher = null;
prevRamReader = null;
prevRamDirectory= null;
}
logger.debug("finsihed updating disk");
}catch(Exception e){
logger.info(e);
}
if(shutdownLatch != null){
shutdownLatch.countDown();
logger.info("index sync complete");
break;
}
}
}
public void shutdown() {
shutdownLatch = new CountDownLatch(1);
try{
shutdownLatch.await();
}catch(InterruptedException e){
Thread.currentThread().interrupt();
}
logger.info("Index shutdown complete");
}
public void optimize() throws ThrudexException{
/*try{
this.writer.optimize();
}catch(IOException e){
throw new ThrudexException(e.toString());
}*/
}
}