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Lucene example source code file (TestRemoteCachingWrapperFilter.java)

This example Lucene source code file (TestRemoteCachingWrapperFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

a, a, b, document, exception, indexwriter, querywrapperfilter, remotecachingwrapperfilterhelper, remotecachingwrapperfilterhelper, searchable, term, term, termquery, termquery

The Lucene TestRemoteCachingWrapperFilter.java source code

package org.apache.lucene.search;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.analysis.SimpleAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

/**
 * Tests that the index is cached on the searcher side of things.
 */
public class TestRemoteCachingWrapperFilter extends RemoteTestCase {
  private static Directory indexStore;
  private static Searchable local;
  
  @BeforeClass
  public static void beforeClass() throws Exception {
    // construct an index
    indexStore = newDirectory();
    IndexWriter writer = new IndexWriter(indexStore, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new SimpleAnalyzer(
        TEST_VERSION_CURRENT)));
    Document doc = new Document();
    doc.add(newField("test", "test text", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(newField("type", "A", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(newField("other", "other test text", Field.Store.YES, Field.Index.ANALYZED));
    writer.addDocument(doc);
    //Need a second document to search for
    doc = new Document();
    doc.add(newField("test", "test text", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(newField("type", "B", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(newField("other", "other test text", Field.Store.YES, Field.Index.ANALYZED));
    writer.addDocument(doc);
    writer.optimize();
    writer.close();
    local = new IndexSearcher(indexStore, true);
    startServer(local);
  }

  @AfterClass
  public static void afterClass() throws Exception {
    local.close();
    indexStore.close();
    indexStore = null;
  }
  
  private static void search(Query query, Filter filter, int hitNumber, String typeValue) throws Exception {
    Searchable[] searchables = { lookupRemote() };
    Searcher searcher = new MultiSearcher(searchables);
    ScoreDoc[] result = searcher.search(query,filter, 1000).scoreDocs;
    assertEquals(1, result.length);
    Document document = searcher.doc(result[hitNumber].doc);
    assertTrue("document is null and it shouldn't be", document != null);
    assertEquals(typeValue, document.get("type"));
    assertTrue("document.getFields() Size: " + document.getFields().size() + " is not: " + 3, document.getFields().size() == 3);
  }

  @Test
  public void testTermRemoteFilter() throws Exception {
    CachingWrapperFilterHelper cwfh = new CachingWrapperFilterHelper(new QueryWrapperFilter(new TermQuery(new Term("type", "a"))));
    
    // This is what we are fixing - if one uses a CachingWrapperFilter(Helper) it will never 
    // cache the filter on the remote site
    cwfh.setShouldHaveCache(false);
    search(new TermQuery(new Term("test", "test")), cwfh, 0, "A");
    cwfh.setShouldHaveCache(false);
    search(new TermQuery(new Term("test", "test")), cwfh, 0, "A");
    
    // This is how we fix caching - we wrap a Filter in the RemoteCachingWrapperFilter(Handler - for testing)
    // to cache the Filter on the searcher (remote) side
    RemoteCachingWrapperFilterHelper rcwfh = new RemoteCachingWrapperFilterHelper(cwfh, false);
    search(new TermQuery(new Term("test", "test")), rcwfh, 0, "A");

    // 2nd time we do the search, we should be using the cached Filter
    rcwfh.shouldHaveCache(true);
    search(new TermQuery(new Term("test", "test")), rcwfh, 0, "A");

    // assert that we get the same cached Filter, even if we create a new instance of RemoteCachingWrapperFilter(Helper)
    // this should pass because the Filter parameters are the same, and the cache uses Filter's hashCode() as cache keys,
    // and Filters' hashCode() builds on Filter parameters, not the Filter instance itself
    rcwfh = new RemoteCachingWrapperFilterHelper(new QueryWrapperFilter(new TermQuery(new Term("type", "a"))), false);
    rcwfh.shouldHaveCache(false);
    search(new TermQuery(new Term("test", "test")), rcwfh, 0, "A");

    rcwfh = new RemoteCachingWrapperFilterHelper(new QueryWrapperFilter(new TermQuery(new Term("type", "a"))), false);
    rcwfh.shouldHaveCache(true);
    search(new TermQuery(new Term("test", "test")), rcwfh, 0, "A");

    // assert that we get a non-cached version of the Filter because this is a new Query (type:b)
    rcwfh = new RemoteCachingWrapperFilterHelper(new QueryWrapperFilter(new TermQuery(new Term("type", "b"))), false);
    rcwfh.shouldHaveCache(false);
    search(new TermQuery(new Term("type", "b")), rcwfh, 0, "B");
  }
}

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