com.npower.dl.OMADownloadServlet.java Source code

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Here is the source code for com.npower.dl.OMADownloadServlet.java

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/**
  * $Header: /home/master/nWave-DM-Common/src/com/npower/dl/OMADownloadServlet.java,v 1.5 2007/08/29 06:21:00 zhao Exp $
  * $Revision: 1.5 $
  * $Date: 2007/08/29 06:21:00 $
  *
  * ===============================================================================================
  * License, Version 1.1
  *
  * Copyright (c) 1994-2006 NPower Network Software Ltd.  All rights reserved.
  *
  * This SOURCE CODE FILE, which has been provided by NPower as part
  * of a NPower product for use ONLY by licensed users of the product,
  * includes CONFIDENTIAL and PROPRIETARY information of NPower.
  *
  * USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
  * OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
  * THE PRODUCT.
  *
  * IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD NPower, ITS RELATED
  * COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY CLAIMS
  * OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR DISTRIBUTION
  * OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES ARISING OUT OF
  * OR RESULTING FROM THE USE, MODIFICATION, OR DISTRIBUTION OF PROGRAMS
  * OR FILES CREATED FROM, BASED ON, AND/OR DERIVED FROM THIS SOURCE
  * CODE FILE.
  * ===============================================================================================
  */
package com.npower.dl;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author Zhao DongLu
 * @version $Revision: 1.5 $ $Date: 2007/08/29 06:21:00 $
 */
public class OMADownloadServlet extends HttpServlet {
    public static Log log = LogFactory.getLog(OMADownloadServlet.class);

    //Initialize global variables
    public void init() throws ServletException {
        super.init();
    }

    public void doDownloadDescriptor(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String requestUrl = request.getRequestURL().toString();
        String requestUri = request.getRequestURI();
        log.info("Download Service: Download Descriptor: url: " + requestUrl);
        log.info("Download Service: Download Descriptor: uri: " + requestUri);

        String downloadID = DownloadFactory.parserDownloadID(requestUri);

        log.info("Download Service: Request download ID: " + downloadID);

        DownloadFactory ddFactory = DownloadFactory.newInstance();
        DownloadDescriptor descriptor = ddFactory.getDownloadDescriptor(downloadID);

        try {
            String serverURL = DownloadFactory.getServerURL(requestUrl);
            String baseURL = serverURL + request.getContextPath() + "/dl";

            //String baseURL = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
            //                + request.getContextPath() + "/dl";

            descriptor.setDownloadURI(baseURL + "/" + DownloadFactory.OPERATION_DOWNLOAD);
            descriptor.setInstallNotifyURI(baseURL + "/" + DownloadFactory.OPERARION_INSTALL_NOTIFICATION);

            String content = descriptor.getContent();
            response.setContentType(descriptor.getContentType());
            response.setContentLength(content.length());

            OutputStream out = response.getOutputStream();
            out.write(content.getBytes("UTF-8"));
            out.flush();
            out.close();

            log.debug("Download Descriptor Content: " + content);
        } catch (Exception ex) {
            throw new ServletException(ex);
        } finally {
        }
    }

    public void doDownload(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String uri = request.getRequestURI();
        log.info("Download Service: Download Content: uri: " + uri);

        String downloadID = DownloadFactory.parserDownloadID(uri);

        FumoDownloadUpdate download = new FumoDownloadUpdate();
        download.setDownloadID(downloadID);
        try {
            byte[] content = download.getContent();
            if (content != null && content.length > 0) {
                log.info("Download Service: Request download ID: " + downloadID + ",Content size: "
                        + content.length);
                response.setContentType(download.getContentType());
                response.setContentLength(content.length);
                OutputStream out = response.getOutputStream();
                out.write(content);
                out.flush();
                //out.close();
            }
        } catch (Exception ex) {
            throw new ServletException(ex);
        } finally {
        }
    }

    public void doInstallNotification(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String uri = request.getRequestURI();
        log.info("Download Service: Install Notification: uri: " + uri);
        //String downloadID = DownloadDescriptorFactory.parserDownloadID(uri);

        try {
            log.info("Receive Install Notification: " + uri);
        } catch (Exception ex) {
            throw new ServletException(ex);
        } finally {
        }
    }

    /**
     * @param request
     */
    private void logRequest(HttpServletRequest request) {
        Enumeration<String> names = request.getHeaderNames();
        while (names.hasMoreElements()) {
            String name = names.nextElement();
            String value = request.getHeader(name);
            log.info("Http header: " + name + "=" + value);
        }
        names = request.getParameterNames();
        while (names.hasMoreElements()) {
            String name = (String) names.nextElement();
            String value = request.getHeader(name);
            log.info("Http param: " + name + "=" + value);
        }
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String uri = request.getRequestURI();

        String operatoin = DownloadFactory.parserOperation(uri);

        this.logRequest(request);

        if (StringUtils.isEmpty(operatoin)) {
            throw new ServletException("Unknown Download Operation!");
        }

        if (operatoin.equals(DownloadFactory.OPERATION_DOWNLOAD_DESCRIPTOR)) {
            this.doDownloadDescriptor(request, response);
            return;
        } else if (operatoin.equals(DownloadFactory.OPERATION_DOWNLOAD)) {
            this.doDownload(request, response);
            return;
        } else if (operatoin.equals(DownloadFactory.OPERARION_INSTALL_NOTIFICATION)) {
            this.doInstallNotification(request, response);
            return;
        }
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }

}