com.mathworks.xzheng.tools.remote.SearchClient.java Source code

Introduction

Here is the source code for com.mathworks.xzheng.tools.remote.SearchClient.java

Source

package com.mathworks.xzheng.tools.remote;

/**
 * Copyright Manning Publications Co.
 *
 * Licensed 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 lan      
*/

import java.rmi.Naming;
import java.util.Date;
import java.util.HashMap;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;

// From chapter 9
public class SearchClient {
    private static HashMap searcherCache = new HashMap();

    public static void main(String[] args) throws Exception {
        if (args.length != 1) {
            System.err.println("Usage: SearchClient <query>");
            System.exit(-1);
        }

        String word = args[0];

        for (int i = 0; i < 5; i++) { //1
            search("LIA_Multi", word); //1
            search("LIA_Parallel", word); //1
        } //1
    }

    private static void search(String name, String word) throws Exception {
        TermQuery query = new TermQuery(new Term("word", word));

        IndexSearcher searcher = //2
                (IndexSearcher) searcherCache.get(name); //2

        if (searcher == null) {
            searcher = new IndexSearcher(new MultiReader[] { lookupRemote(name) }); //3
            searcherCache.put(name, searcher);
        }

        long begin = new Date().getTime(); //4
        TopDocs hits = searcher.search(query, 10); //4
        long end = new Date().getTime(); //4

        System.out.print("Searched " + name + " for '" + word + "' (" + (end - begin) + " ms): ");

        if (hits.scoreDocs.length == 0) {
            System.out.print("<NONE FOUND>");
        }

        for (ScoreDoc sd : hits.scoreDocs) {
            Document doc = searcher.doc(sd.doc);
            String[] values = doc.getValues("syn");
            for (String syn : values) {
                System.out.print(syn + " ");
            }
        }
        System.out.println();
        System.out.println();
        // 5
    }

    private static IndexSearcher lookupRemote(String name) throws Exception {
        return (IndexSearcher) Naming.lookup("//localhost/" + name); // 6
    }
}

/*
  #1 Multiple identical searches
  #2 Cache searchers
  #3 Wrap Searchable in MultiSearcher
  #4 Time searching
  #5 Don't close searcher!
  #6 RMI lookup
*/