lucene 实例创建及实时索引

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lucene 实例创建及实时索引0

public class LuceneFactory
{
// song索引
private static IndexReader songReader = null;
private static IndexSearcher songSearcher = null;
private static Directory songDirectory = null;
private static File songDir = new File(ConstantsData.SONG_INDEX_PATH);

public static synchronized IndexReader getSongIndexReader(File file)
throws IOException {

if (songReader == null) {
songDirectory = FSDirectory.open(file);
songReader = DirectoryReader.open(songDirectory);
} else {
songReader = DirectoryReader.openIfChanged((DirectoryReader)songReader);
}

return songReader;
}

public static synchronized IndexSearcher getSongIndexSearcher()
throws IOException {

if (songReader == null)
{
songDirectory = FSDirectory.open(songDir);
songReader = DirectoryReader.open(songDirectory);
} else
{
IndexReader newReader = DirectoryReader.openIfChanged((DirectoryReader) songReader);
if (newReader != null)
{
songReader.close();
songReader = newReader;
}else{
}
}

songSearcher = new IndexSearcher(songReader);

return songSearcher;
}

}

///////////////////////////////////////////////////////////

public class WriteIndex
{
//new File("C:\\Tomcat\\webapps\\index\\ad\\"); //
public static File songDir = new File(ConstantsData.SONG_INDEX_PATH);
public static IndexWriter songWriter = null;
public static Directory songDirectory = null;

static{
initSongWrite();
}

public static void initSongWrite()
{
try
{
// 创建song索引目录
if (songDir.exists()) {
songDirectory = FSDirectory.open(songDir);
if (IndexWriter.isLocked(songDirectory)) {
IndexWriter.unlock(songDirectory);
}
songWriter = new IndexWriter(songDirectory, new IndexWriterConfig(Version.LUCENE_4_9, ConstantsData.ana));
} else {
songDir.mkdirs();
songDirectory = FSDirectory.open(songDir);
songWriter = new IndexWriter(songDirectory, new IndexWriterConfig(Version.LUCENE_4_9, ConstantsData.ana));
}
} catch (Exception e)
{
e.printStackTrace();
}
}

//添加song索引
public static void createsongIndex(Song bean)
{
if(songWriter == null || bean == null)
return;

try
{

Document doc = SongSearch.getSongDocument(bean);
songWriter.addDocument(doc);

songWriter.commit();
} catch (Exception e)
{
e.printStackTrace();
}

}
}

1、LuceneFactory 这种方式创建单例IndexReader 和 IndexSearcher 对不对？
能实时索引吗？效率高吗？有没有更好的方式。。

2、WriteIndex 创建索引效果咋样？能实时索引吗？如果频繁添加索引， songWriter.commit();效率好吗？