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package dk.thoerup.traininfoservice.banedk;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.xml.transform.Source;
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import javax.xml.transform.Templates;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.transform.stream.StreamSource;
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import org.simpleframework.xml.core.Persister;
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import dk.thoerup.android.traininfo.common.DepartureBean;
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import dk.thoerup.circuitbreaker.CircuitBreakerException;
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import dk.thoerup.traininfoservice.Statistics;
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/**
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* Servlet implementation class DepartureServlet
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*/
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public class DepartureServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
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DepartureFetcher fetcher;
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TransformerFactory xslTransFact;
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Templates xslTemplate;
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@Override
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public void init() throws ServletException {
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super.init();
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boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
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int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
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int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
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logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
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fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
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xslTransFact = TransformerFactory.newInstance();
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String xslPath = getServletContext().getRealPath("/departures.xsl");
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Source stylesheet = new StreamSource( new File(xslPath) );
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try {
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//xslTemplate = xslTransFact.newTemplates(stylesheet);
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} catch (Exception e) {
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throw new ServletException(e);
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}
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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if (req.getParameter("station") == null) {
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resp.sendError(400, "not enough parameters");
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return;
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}
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boolean arrival = false;
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try {
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arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
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} catch (Exception e) {}
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Statistics.getInstance().incrementDepartureLookups();
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int station = Integer.parseInt( req.getParameter("station") );
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String format = req.getParameter("format");
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DepartureBean beans;
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try {
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beans = fetcher.cachedLookupDepartures(station, arrival);
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beans.arrival = arrival;
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} catch (java.io.IOException ioe) {
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logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
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Statistics.getInstance().incrementDepartureErrors();
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resp.sendError(500);
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return;
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} catch (CircuitBreakerException cbe) {
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logger.warning("Circuitbreaker - failing fast");
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Statistics.getInstance().incrementDepartureErrors();
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resp.sendError(500);
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return;
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} catch (Exception e) {
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logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
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Statistics.getInstance().incrementDepartureErrors();
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resp.sendError(500);
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return;
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}
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resp.setDateHeader("Expires", 0);
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resp.setHeader("Cache-Control", "no-cache, must-revalidate");
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if (format.equalsIgnoreCase("xml")) {
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resp.setContentType("text/xml; charset=utf-8");
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resp.getWriter().print( formatXml(beans) );
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} else if (format.equalsIgnoreCase("html")) {
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/*
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String advStr = req.getParameter("advanced");
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boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
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req.setAttribute("advanced", advanced);
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req.setAttribute("departurebeans", beans);
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req.setAttribute("stationID", station );
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getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);*/
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resp.setContentType("text/html");
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resp.getWriter().print( xmlToHtml(formatXml(beans)) );
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} else {
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resp.sendError(400, "Unknown format");
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}
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}
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protected String formatXml(DepartureBean beans) throws ServletException{
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Persister serializer = new Persister();
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StringWriter out = new StringWriter();
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try {
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serializer.write(beans, out);
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} catch (Exception e) {
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throw new ServletException(e);
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}
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return out.toString();
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}
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protected String xmlToHtml(String input) throws ServletException {
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try {
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Transformer trans = xslTemplate.newTransformer();
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Source xml = new StreamSource( new ByteArrayInputStream(input.getBytes() ));
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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trans.transform(xml, new StreamResult(out));
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return out.toString();
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} catch (Exception e) {
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throw new ServletException(e);
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}
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}
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}
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