java - 适用于 Google App Engine 的最佳 Java 文本索引库是什么？

Question

目前我知道 compass 可以处理这项工作。但是用罗盘索引看起来很昂贵。有没有更轻的替代品？

Answer 1

老实说，我不知道 Lucene 在索引方面是否会比 Compass 更轻(为什么会这样，Compass 不为此使用 Lucene？)。

无论如何，因为您要求替代品，所以有 GAELucene .我在引用 its announcement下面:

Enlightened by the discussion "Can I run Lucene in google app engine?", I implemented a google datastore based Lucene component, GAELucene, which can help you to run search applications on google app engine.

The main clazz of GAELucene include:

• GAEDirectory - a read only Directory based on google datastore.
• GAEFile - stands for an index file, the file's byte content will be splited into multi GAEFileContent.
• GAEFileContent - stands for a segment of index file.
• GAECategory - the identifier of different indices.
• GAEIndexInput - a memory-resident IndexInput? implementation like the RAMInputStream.
• GAEIndexReader - wrapper for IndexReader? that cached in GAEIndexReaderPool
• GAEIndexReaderPool - pool for GAEIndexReader

The following code snippet demonstrates the use of GAELucene do searching:

Query queryObject = parserQuery(request);
GAEIndexReaderPool readerPool = GAEIndexReaderPool.getInstance();
GAEIndexReader indexReader = readerPool.borrowReader(INDEX_CATEGORY_DEMO);
IndexSearcher searcher = newIndexSearcher(indexReader);
Hits hits = searcher.search(queryObject);
readerPool.returnReader(indexReader);

我强烈建议阅读有关 nabble 的整个讨论，内容非常丰富。

为了以防万一，关于 Compass，Shay Banon 在这里写了一篇博客文章，详细介绍了如何在 App Engine 中使用 Compass:http://www.kimchy.org/searchable-google-appengine-with-compass/