Commons Net example source code file (TimeTCPClientTest.java)

This example Commons Net source code file (TimeTCPClientTest.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 - Commons Net tags/keywords

calendar, exception, exception, io, ioexception, net, network, testcase, timetcpclient, timetcpclient, timetcpclienttest, timetestsimpleserver, timetestsimpleserver, timezone, timezone, utc, util

The Commons Net TimeTCPClientTest.java source code

/*
 * 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.
 */
package org.apache.commons.net.time;

import java.net.InetAddress;
import java.util.Calendar;
import java.io.IOException;
import java.util.TimeZone;

import junit.framework.TestCase;

public class TimeTCPClientTest extends TestCase
{
    private TimeTestSimpleServer server1;

    private int _port = 3333; // default test port

    /***
     * open connections needed for the tests for the test.
     ***/
    protected void openConnections() throws Exception
    {
    try {
            server1 = new TimeTestSimpleServer(_port);
            server1.connect();
    } catch (IOException ioe)
    {
        // try again on another port
        _port = 4000;
            server1 = new TimeTestSimpleServer(_port);
            server1.connect();
    }
        server1.start();
    }

    /***
     *  tests the constant basetime used by TimeClient against tha
     *  computed from Calendar class.
     */
    public void testInitial() {
        TimeZone utcZone = TimeZone.getTimeZone("UTC");
        Calendar calendar = Calendar.getInstance(utcZone);
        calendar.set(1900, Calendar.JANUARY, 1, 0, 0, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        long baseTime = calendar.getTime().getTime() / 1000L;

        assertEquals(baseTime, -TimeTCPClient.SECONDS_1900_TO_1970);
    }

    /***
     * tests the times retrieved via the Time protocol implementation.
     ***/
    public void testCompareTimes() throws Exception
    {
        openConnections();

        long time, time2;
        long clientTime, clientTime2;
        try
        {
            TimeTCPClient client = new TimeTCPClient();
            try
            {
                // We want to timeout if a response takes longer than 60 seconds
                client.setDefaultTimeout(60000);
                client.connect(InetAddress.getLocalHost(), _port);
                clientTime = client.getDate().getTime();
                time = System.currentTimeMillis();
            } finally
            {
              if(client.isConnected())
                client.disconnect();
            }

            try
            {
                // We want to timeout if a response takes longer than 60 seconds
                client.setDefaultTimeout(60000);
                client.connect(InetAddress.getLocalHost(), _port);
                clientTime2 = (client.getTime() - TimeTCPClient.SECONDS_1900_TO_1970)*1000L;
                time2 = System.currentTimeMillis();
            } finally
            {
              if(client.isConnected())
                client.disconnect();
            }

        } finally
        {
            closeConnections();
        }

      // current time shouldn't differ from time reported via network by 5 seconds
      assertTrue(Math.abs(time - clientTime) < 5000);
      assertTrue(Math.abs(time2 - clientTime2) < 5000);
    }

    /***
     * closes all the connections
     ***/
    protected void closeConnections()
    {
        try
        {
            server1.stop();
            Thread.sleep(1000);
        } catch (Exception e)
        {
        }
    }
}