org.meresco.lucene.suggestion.SuggestionHttpServer.java Source code

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Here is the source code for org.meresco.lucene.suggestion.SuggestionHttpServer.java

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/* begin license *
 *
 * "Meresco Lucene" is a set of components and tools to integrate Lucene (based on PyLucene) into Meresco
 *
 * Copyright (C) 2015 Koninklijke Bibliotheek (KB) http://www.kb.nl
 * Copyright (C) 2015-2016 Seecr (Seek You Too B.V.) http://seecr.nl
 *
 * This file is part of "Meresco Lucene"
 *
 * "Meresco Lucene" is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * "Meresco Lucene" is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with "Meresco Lucene"; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * end license */

package org.meresco.lucene.suggestion;

import java.nio.charset.Charset;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.TimeUnit;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.MissingOptionException;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.PosixParser;
import org.eclipse.jetty.server.HttpConnectionFactory;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.util.thread.ExecutorThreadPool;
import org.meresco.lucene.OutOfMemoryShutdown;
import org.meresco.lucene.Shutdown;

import sun.misc.Signal;
import sun.misc.SignalHandler;

public class SuggestionHttpServer {

    private static final int COMMIT_COUNT = 10000;
    private static final int MIN_SHINGLE_SIZE = 2;
    private static final int MAX_SHINGLE_SIZE = 6;

    public static void main(String[] args) throws Exception {
        Options options = new Options();

        Option option = new Option("p", "port", true, "Port number");
        option.setType(Integer.class);
        option.setRequired(true);
        options.addOption(option);

        option = new Option("d", "stateDir", true, "Directory in which lucene data is located");
        option.setType(String.class);
        option.setRequired(true);
        options.addOption(option);

        PosixParser parser = new PosixParser();
        CommandLine commandLine = null;
        try {
            commandLine = parser.parse(options, args);
        } catch (MissingOptionException e) {
            HelpFormatter helpFormatter = new HelpFormatter();
            helpFormatter.printHelp("start-suggestion-server", options);
            System.exit(1);
        }

        Integer port = new Integer(commandLine.getOptionValue("p"));
        String stateDir = commandLine.getOptionValue("d");

        if (Charset.defaultCharset() != Charset.forName("UTF-8")) {
            System.err.println("file.encoding must be UTF-8.");
            System.exit(1);
        }

        SuggestionIndex suggestionIndex = new SuggestionIndex(stateDir + "/suggestions", stateDir + "/ngram",
                MIN_SHINGLE_SIZE, MAX_SHINGLE_SIZE, COMMIT_COUNT);

        ExecutorThreadPool pool = new ExecutorThreadPool(50, 200, 60, TimeUnit.SECONDS,
                new ArrayBlockingQueue<Runnable>(1000));
        Server server = new Server(pool);
        ServerConnector http = new ServerConnector(server, new HttpConnectionFactory());
        http.setPort(port);
        server.addConnector(http);

        OutOfMemoryShutdown shutdown = new SuggestionShutdown(server, suggestionIndex);
        registerShutdownHandler(shutdown);

        server.setHandler(new SuggestionHandler(suggestionIndex, shutdown));
        server.start();
        server.join();
    }

    public static void registerShutdownHandler(final Shutdown shutdown) {
        Signal.handle(new Signal("TERM"), new SignalHandler() {
            public void handle(Signal sig) {
                shutdown.shutdown();
            }
        });
        Signal.handle(new Signal("INT"), new SignalHandler() {
            public void handle(Signal sig) {
                shutdown.shutdown();
            }
        });
    }
}