ReadHttp.java

/*
    BeepBeep, an event stream processor
    Copyright (C) 2008-2017 Sylvain Hallé

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package io;

import ca.uqac.lif.cep.Connector;
import ca.uqac.lif.cep.ProcessorException;
import ca.uqac.lif.cep.io.HttpGet;
import ca.uqac.lif.cep.io.Print;
import ca.uqac.lif.cep.tmf.Pump;

/**
 * Read bytes from a remote source using HTTP. 
 * 
 * @author Sylvain Hallé
 * @difficulty Easy
 */
public class ReadHttp
{
    public static void main(String[] args) throws ProcessorException, InterruptedException 
    {
        /* We create an HttpGet processor stream reader, and instruct it to send
         * requests to some URL (change it to a valid URL to make the program
         * work). */
        ///
        HttpGet get = new HttpGet("http://example.com/some-url");
        
        /* We connect the reader to a pump, which will periodically ask
         * the reader to read new characters from the input stream */
        Pump pump = new Pump(10000);
        Thread pump_thread = new Thread(pump);
        Connector.connect(get, pump);
        
        /* We connect the output of the stream reader to a Print processor,
         * that will merely re-print to the standard output what was received
         * from the standard input. */
        Print print = new Print();
        Connector.connect(pump, print);
        
        /* We need to call start() on the pump's thread so that it can start
         * listening to its input stream. */
        pump_thread.start();
        
        /* Since our program does nothing else, it would stop right away.
         * We put here an idle loop. You can stop it by pressing Ctrl+C. */
        while (true)
        {
            Thread.sleep(10000);
        }
        ///
    }

}