lucene 近实时搜索实例

package com.jiepu.lucene_30;

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;

//lucene 近实时搜索的实现
// 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
*/