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package dk.thoerup.traininfoservice.banedk; |
package dk.thoerup.traininfoservice.banedk; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
import java.io.IOException; |
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import java.io.StringWriter; |
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import java.util.logging.Level; |
import java.util.logging.Level; |
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import java.util.logging.Logger; |
import java.util.logging.Logger; |
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import javax.servlet.http.HttpServlet; |
import javax.servlet.http.HttpServlet; |
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import javax.servlet.http.HttpServletRequest; |
import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
import javax.servlet.http.HttpServletResponse; |
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import javax.xml.parsers.DocumentBuilderFactory; |
import javax.xml.transform.Templates; |
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import javax.xml.transform.TransformerFactory; |
import javax.xml.transform.TransformerFactory; |
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import org.simpleframework.xml.Serializer; |
import org.simpleframework.xml.Serializer; |
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import org.simpleframework.xml.core.Persister; |
import org.simpleframework.xml.core.Persister; |
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import dk.thoerup.android.traininfo.common.DepartureBean; |
import dk.thoerup.android.traininfo.common.DepartureBean; |
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import dk.thoerup.android.traininfo.common.StationBean; |
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import dk.thoerup.circuitbreaker.CircuitBreakerException; |
import dk.thoerup.circuitbreaker.CircuitBreakerException; |
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import dk.thoerup.traininfoservice.Statistics; |
import dk.thoerup.traininfoservice.Statistics; |
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import dk.thoerup.traininfoservice.TraininfoSettings; |
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import dk.thoerup.traininfoservice.banedk.DepartureFetcher.FetchTrainType; |
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import dk.thoerup.traininfoservice.db.StationDAO; |
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/** |
/** |
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* Servlet implementation class DepartureServlet |
* Servlet implementation class DepartureServlet |
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Logger logger = Logger.getLogger( DepartureServlet.class.getName() ); |
Logger logger = Logger.getLogger( DepartureServlet.class.getName() ); |
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DepartureFetcher fetcher; |
DepartureFetcher fetcher; |
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TransformerFactory transformerFactory = TransformerFactory.newInstance(); |
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DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance(); |
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TransformerFactory xslTransFact; |
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Templates xslTemplate; |
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@Override |
@Override |
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public void init() throws ServletException { |
public void init() throws ServletException { |
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super.init(); |
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") ); |
TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings"); |
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int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") ); |
fetcher = new DepartureFetcher(settings); |
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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 |
@Override |
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { |
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { |
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if (req.getParameter("station") == null) { |
if (req.getParameter("station") == null || req.getParameter("station").equals("") ) { |
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resp.sendError(400, "not enough parameters"); |
resp.sendError(400, "not enough parameters (station)"); |
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return; |
return; |
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} |
} |
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if (req.getParameter("format") == null || req.getParameter("format").equals("")) { |
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resp.sendError(400, "not enough parameters (format)"); |
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return; |
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} |
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boolean arrival = false; |
boolean arrival = false; |
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try { |
try { |
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int station = Integer.parseInt( req.getParameter("station") ); |
int station = Integer.parseInt( req.getParameter("station") ); |
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String format = req.getParameter("format"); |
String format = req.getParameter("format"); |
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DepartureBean beans; |
DepartureBean beans; |
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DepartureFetcher.FetchTrainType type = FetchTrainType.BOTH; |
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if ( req.getParameter("type") != null) { |
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type = FetchTrainType.valueOf( req.getParameter("type") ); |
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} |
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try { |
try { |
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beans = fetcher.cachedLookupDepartures(station, arrival); |
beans = fetcher.cachedLookupDepartures(station, arrival, type); |
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beans.arrival = arrival; |
beans.arrival = arrival; |
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} catch (java.io.IOException ioe) { |
} catch (java.io.IOException ioe) { |
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logger.warning("Read failed, station="+station + ". " + ioe.getMessage() ); |
logger.warning("Read failed, station="+station + ". " + ioe.getMessage() ); |
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Statistics.getInstance().incrementDepartureErrors(); |
Statistics.getInstance().incrementDepartureErrors(); |
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resp.sendError(500); |
resp.sendError(500, "backend didnt answer"); |
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return; |
return; |
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} catch (CircuitBreakerException cbe) { |
} catch (CircuitBreakerException cbe) { |
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logger.warning("Circuitbreaker - failing fast"); |
logger.warning("Circuitbreaker - failing fast, station=" +station); |
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Statistics.getInstance().incrementDepartureErrors(); |
Statistics.getInstance().incrementDepartureErrors(); |
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resp.sendError(500); |
beans = generateErrorBean(1); |
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return; |
} catch (StationDAO.NostationException nse) { |
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logger.log(Level.WARNING, "Station not in Database, station=" +station); |
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Statistics.getInstance().incrementDepartureErrors(); |
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resp.sendError(400, "invalid station ID"); |
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return; |
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} catch (Exception e) { |
} catch (Exception e) { |
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logger.log(Level.WARNING, "Unknown exception, station=" +station, e); |
logger.log(Level.WARNING, "Unknown exception, station=" +station, e); |
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Statistics.getInstance().incrementDepartureErrors(); |
Statistics.getInstance().incrementDepartureErrors(); |
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req.setAttribute("departurebeans", beans); |
req.setAttribute("departurebeans", beans); |
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req.setAttribute("stationID", station ); |
req.setAttribute("stationID", station ); |
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getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp); |
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 { |
} else { |
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resp.sendError(400, "Unknown format"); |
resp.sendError(400, "Unknown format"); |
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} |
} |
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} |
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protected DepartureBean generateErrorBean(int code) { |
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DepartureBean bean = new DepartureBean(); |
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bean.stationName=""; |
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bean.errorCode = code; |
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return bean; |
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} |
} |
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protected String formatXml(DepartureBean beans) throws ServletException{ |
protected String formatXml(DepartureBean beans) throws ServletException{ |
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Serializer serializer = new Persister(); |
Serializer serializer = new Persister(); |
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ByteArrayOutputStream out = new ByteArrayOutputStream(); |
StringWriter out = new StringWriter(); |
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try { |
try { |
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serializer.write(beans, out); |
serializer.write(beans, out); |
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return out.toString(); |
return out.toString(); |
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} |
} |
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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 StringReader(input)); |
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StringWriter out = new StringWriter(); |
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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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} |
} |