org.glassfish.grizzly.samples.simpleauth.Client Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of grizzly-framework-samples Show documentation
The newest version!
/*
 * Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.glassfish.grizzly.samples.simpleauth;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.filterchain.FilterChainBuilder;
import org.glassfish.grizzly.filterchain.TransportFilter;
import org.glassfish.grizzly.nio.transport.TCPNIOTransport;
import org.glassfish.grizzly.nio.transport.TCPNIOTransportBuilder;
import org.glassfish.grizzly.utils.Charsets;

/**
 * Client implementation, which sends a message to a {@link Server} and checks the response.
 *
 * Client and server exchange String based messages:
 *
 * (1) MultiLinePacket = command *(parameter LF) LF parameter = TEXT (ASCII)
 *
 * Server filters are built in a following way:
 *
 * {@link TransportFilter} - reads/writes data from/to network {@link MultiStringFilter} - translates Buffer <->
 * List<String> {@link MultiLineFilter} - translates List<String> <-> MultiLinePacket (see 1)
 * {@link ClientAuthFilter} - checks, if client is authenticated. If not - initialize client authentication, and only
 * then sends the message. {@link ClientFilter} - client filter, which gets server echo and prints it out.
 *
 * @author Alexey Stashok
 */
public class Client {
    private static final Logger logger = Logger.getLogger(Client.class.getName());

    @SuppressWarnings("unchecked")
    public static void main(String[] args) throws Exception {
        // Create a FilterChain using FilterChainBuilder
        FilterChainBuilder filterChainBuilder = FilterChainBuilder.stateless();
        // Add TransportFilter, which is responsible
        // for reading and writing data to the connection
        filterChainBuilder.add(new TransportFilter());
        // MultiStringFilter is responsible for parsing list of string lines
        filterChainBuilder.add(new MultiStringFilter(Charset.forName("ASCII"), "\n") {
            @Override
            protected List createInList() {
                // overwrite createInList to return LinkedList instead of ArrayList
                return new LinkedList<>();
            }
        });

        // MultiLineFilter is responsible for gathering parsed lines in a single multi line packet
        filterChainBuilder.add(new MultiLineFilter(""));
        // AuthFilter is responsible for client authentication
        filterChainBuilder.add(new ClientAuthFilter());
        // Client filter, which prints out the server echo message
        filterChainBuilder.add(new ClientFilter());

        // Create TCP transport
        final TCPNIOTransport transport = TCPNIOTransportBuilder.newInstance().build();
        transport.setProcessor(filterChainBuilder.build());

        try {
            // start the transport
            transport.start();

            Future connectFuture = transport.connect(Server.HOST, Server.PORT);

            final Connection connection = connectFuture.get(10, TimeUnit.SECONDS);

            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in, Charsets.ASCII_CHARSET));

            while (true) {
                System.out.print("Type the message (Empty line for quit): ");
                String input = reader.readLine();

                if ("".equals(input)) {
                    break;
                }

                // Send echo message
                final MultiLinePacket request = MultiLinePacket.create("echo", input);
                logger.log(Level.INFO, "--------- Client is sending the request:\n{0}", request);

                connection.write(request);
            }

        } finally {
            logger.info("Stopping transport...");
            // stop the transport
            transport.shutdownNow();

            logger.info("Stopped transport...");
        }
    }
}