Examples with SearcherManager org.apache.lucene.search.SearcherManager used on opensource projects

Example 21 with SearcherManager

use of org.apache.lucene.search.SearcherManager in project OpenGrok by OpenGrok.

the class RuntimeEnvironment method getIndexSearcher.

/**
 * Get IndexSearcher for given project.
 * Each IndexSearcher is born from a SearcherManager object. There is one SearcherManager for every project.
 * This schema makes it possible to reuse IndexSearcher/IndexReader objects so the heavy lifting
 * (esp. system calls) performed in FSDirectory and DirectoryReader happens only once for a project.
 * The caller has to make sure that the IndexSearcher is returned back
 * to the SearcherManager. This is done with returnIndexSearcher().
 * The return of the IndexSearcher should happen only after the search result data are read fully.
 *
 * @param projectName project
 * @return SearcherManager for given project
 * @throws IOException I/O exception
 */
@SuppressWarnings("java:S2095")
public SuperIndexSearcher getIndexSearcher(String projectName) throws IOException {
    SearcherManager mgr = searcherManagerMap.get(projectName);
    SuperIndexSearcher searcher;
    if (mgr == null) {
        File indexDir = new File(getDataRootPath(), IndexDatabase.INDEX_DIR);
        Directory dir = FSDirectory.open(new File(indexDir, projectName).toPath());
        mgr = new SearcherManager(dir, new ThreadpoolSearcherFactory());
        searcherManagerMap.put(projectName, mgr);
    }
    searcher = (SuperIndexSearcher) mgr.acquire();
    searcher.setSearcherManager(mgr);
    return searcher;
}