--- Otis Gospodnetic <[EMAIL PROTECTED]> wrote:
> No, you can't add documents to an index once you close the IndexWriter.
> You can re-open the IndexWriter and add more documents, of course.
>
> Otis
That's what I expected at first, but:
1- It's a disappointment, because such a 'feature' would have made IndexeWriter
management much easier. You would open an IndexWriter at startup and reuse it
during all the life of the application, just flushing on a regular base using
the close() method and without worrying if other objects are currently using
the writer.
2- When you say you can't add, do you mean it's impossible or that you
shouldn't because for example it could corrupt the index?
Maybe I'm wrong, but I think it's possible. Let's look at the follwoing code:
"
public static void main(String[] args) throws IOException
{
final IndexWriter writer1 = new IndexWriter("/tmp/test-reuse", new
StandardAnalyzer(), true);
// First write with the writer
Document doc = new Document();
doc.add(new Field("name", "John", Field.Store.YES,
Field.Index.UN_TOKENIZED));
writer1.addDocument(doc);
System.out.println("1 ---- After first write, before closing the writer
---");
Searcher searcher = new IndexSearcher("/tmp/test-reuse");
Query query = new TermQuery(new Term("name", "John"));
Hits hits = searcher.search(query);
System.out.println("===> hits: " + hits.length());
System.out.println();
// CLOSING THE WRITER ONCE
writer1.close();
System.out.println("2 ---- After first write, after closing the writer
---");
searcher = new IndexSearcher("/tmp/test-reuse");
hits = searcher.search(query);
System.out.println("===> hits: " + hits.length());
System.out.println();
// Second write, THE WRITER HAS ALREADY BEEN CLOSED ONCE
writer1.addDocument(doc);
System.out.println("3 ---- After second write, the writer has been
closed once
---");
hits = searcher.search(query);
System.out.println("===> hits: " + hits.length());
System.out.println();
// Closing the writer again
writer1.close();
System.out.println("4 ---- After second write, the writer has been
closed
twice ---");
searcher = new IndexSearcher("/tmp/test-reuse");
hits = searcher.search(query);
System.out.println("===> hits: " + hits.length());
}
== Results ==
1 ---- After first write, before closing the writer ---
===> hits: 0
2 ---- After first write, after closing the writer ---
===> hits: 1
3 ---- After second write, the writer has been closed once ---
===> hits: 1
4 ---- After second write, the writer has been closed twice ---
===> hits: 2
As your can see, not only does the code above execute without complain but it
also gives the right results.
Thanks for your comments.
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