package lia.searching;
/**
* Copyright Manning Publications Co.
*
* Licensed 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 lan
*/
import org.apache.lucene.util.Version;
import org.apache.lucene.store.*;
import org.apache.lucene.index.*;
import org.apache.lucene.search.*;
import org.apache.lucene.document.*;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import junit.framework.TestCase;
// From chapter 3
public class NearRealTimeTest extends TestCase {
public void testNearRealTime() throws Exception {
Directory dir = new RAMDirectory();
IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(Version.LUCENE_30), IndexWriter.MaxFieldLength.UNLIMITED);
for(int i=0;i<10;i++) {
Document doc = new Document();
doc.add(new Field("id", ""+i, Field.Store.NO, Field.Index.NOT_ANALYZED_NO_NORMS));
doc.add(new Field("text", "aaa", Field.Store.NO, Field.Index.ANALYZED));
writer.addDocument(doc);
}
IndexReader reader = writer.getReader(); // #1
IndexSearcher searcher = new IndexSearcher(reader); // #A
Query query = new TermQuery(new Term("text", "aaa"));
TopDocs docs = searcher.search(query, 1);
assertEquals(10, docs.totalHits); // #B
writer.deleteDocuments(new Term("id", "7")); // #2
Document doc = new Document(); // #3
doc.add(new Field("id", // #3
"11", // #3
Field.Store.NO, // #3
Field.Index.NOT_ANALYZED_NO_NORMS)); // #3
doc.add(new Field("text", // #3
"bbb", // #3
Field.Store.NO, // #3
Field.Index.ANALYZED)); // #3
writer.addDocument(doc); // #3
IndexReader newReader = reader.reopen(); // #4
assertFalse(reader == newReader); // #5
reader.close(); // #6
searcher = new IndexSearcher(newReader);
TopDocs hits = searcher.search(query, 10); // #7
assertEquals(9, hits.totalHits); // #7
query = new TermQuery(new Term("text", "bbb")); // #8
hits = searcher.search(query, 1); // #8
assertEquals(1, hits.totalHits); // #8
newReader.close();
writer.close();
}
}
/*
#1 Create near-real-time reader
#A Wrap reader in IndexSearcher
#B Search returns 10 hits
#2 Delete 1 document
#3 Add 1 document
#4 Reopen reader
#5 Confirm reader is new
#6 Close old reader
#7 Verify 9 hits now
#8 Confirm new document matched
*/
/*
#1 IndexWriter returns a reader that's able to search all previously committed changes to the index, plus any uncommitted changes. The returned reader is always readOnly.
#2,#3 We make changes to the index, but do not commit them.
#4,#5,#6 Ask the reader to reopen. Note that this simply re-calls writer.getReader again under the hood. Because we made changes, the newReader will be different from the old one so we must close the old one.
#7, #8 The changes made with the writer are reflected in new searches.
*/