osl.examples.gui.downloader.DLWorker.java Source code

Introduction

Here is the source code for osl.examples.gui.downloader.DLWorker.java

Source

/**
 * Developed by: The Open Systems Lab
 *             University of Illinois at Urbana-Champaign
 *             Department of Computer Science
 *             Urbana, IL 61801
 *             http://osl.cs.uiuc.edu
 *
 * Contact: http://osl.cs.uiuc.edu/af
 *
 * Copyright (c) 1998-2009
 * The University of Illinois Board of Trustees.
 *    All Rights Reserved.
 * 
 * Distributed under license: http://osl.cs.uiuc.edu/af/LICENSE
 * 
 */
package osl.examples.gui.downloader;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;

import osl.manager.Actor;
import osl.manager.ActorName;
import osl.manager.annotations.message;

public class DLWorker extends Actor {

    /**
     * 
     */
    private static final long serialVersionUID = -8070390419887885497L;

    @message
    public void downloadChunk(String url, Integer offset, Integer length, Long total, Integer chunkNumber,
            File tempDir, ActorName manager) {
        System.out.println("offset: " + offset + ", length: " + length);
        HttpClient client = new HttpClient();
        GetMethod request = new GetMethod(url);
        request.addRequestHeader("Range", "bytes=" + offset + "-" + (offset + length - 1)
        // + "/" + total
        );
        try {
            if (client.executeMethod(request) != HttpStatus.SC_PARTIAL_CONTENT) {
                System.out.println("Error in download");
                return;
            }

            BufferedInputStream in = new BufferedInputStream(request.getResponseBodyAsStream());
            File tempFile = new File(tempDir, "_" + offset + "_" + (new Random().nextInt(10000) + 1000) + ".part");
            FileOutputStream fos = new FileOutputStream(tempFile);

            // /*
            byte[] b = new byte[8192];
            int readSize = in.read(b);
            int totalW = 0;
            while (readSize != -1) {
                totalW += readSize;
                // System.out.println(chunkNumber+" <> "+readSize);
                fos.write(b, 0, readSize);
                readSize = in.read(b);
                // System.out.println(new Float(totalW+0.0)/(length+0.0));
                // if (((totalW+0.0)/(length+0.0)*100) % 8 < 3) {
                // System.out.println(new
                // Integer((int)((100.0*totalW)/(length+0.0))).toString());
                send(manager, "percentComplete", new Integer((int) ((100.0 * totalW) / (length + 0.0))),
                        chunkNumber);
                // }
            }
            // */
            /*
             * int readSize = in.read(); int totalW = 0; while (readSize != -1)
             * { fos.write(readSize); readSize = in.read(); totalW ++; }
             */
            // System.out.println(chunkNumber + ", totalW: " + totalW);
            fos.close();
            in.close();
            send(manager, "done", chunkNumber, tempFile.toString());
        } catch (HttpException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}