import org.apache.commons.pool.KeyedObjectPool;

import org.apache.commons.pool.impl.GenericKeyedObjectPool;

import org.apache.commons.pool.impl.GenericKeyedObjectPoolFactory;

import org.apache.lucene.document.Document;

import org.apache.lucene.index.IndexReader;

import org.apache.lucene.index.Term;

import org.apache.lucene.search.IndexSearcher;

import org.apache.lucene.search.NGramPhraseQuery;

import org.apache.lucene.search.ScoreDoc;

import org.apache.lucene.search.TopDocs;

public class LuceneSearcherPool {

    public static void main(String[] args) {

        GenericKeyedObjectPool.Config config = new GenericKeyedObjectPool.Config();

        GenericKeyedObjectPoolFactory<String, IndexReader> poolFactory = new GenericKeyedObjectPoolFactory<String, IndexReader>(new IndexReaderFactory("/var/data/ostree/index"), config);

        KeyedObjectPool<String, IndexReader> pool = poolFactory.createPool();

        try {

            String[] dates = {"2012-01-01", "2011-01-04", "2012-01-05"};

            for (String date : dates) {

                for (int i = 0; i < 10; i++) {

                    long start = System.currentTimeMillis();

                    IndexReader reader = pool.borrowObject(date);

                    test(reader);

                    pool.returnObject(date, reader);

                    System.out.println(date + ":" + i + ";" + (System.currentTimeMillis() - start));

                }

            }

            pool.close();

        } catch (Exception ex) {

        }

    }

    public static void test(IndexReader reader) throws Exception {

        String input = "java";

        int num = 5;

        IndexSearcher searcher = new IndexSearcher(reader);

        TopDocs hits = searcher.search(query, num);

        for (ScoreDoc scoreDoc : hits.scoreDocs) {

            Document doc = searcher.doc(scoreDoc.doc);

        }

        searcher.close();

    }

}