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package dk.thoerup.traininfoservice.banedk; |
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import java.io.IOException; |
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import java.util.List; |
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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 dk.thoerup.circuitbreaker.CircuitBreakerException; |
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import dk.thoerup.traininfoservice.Statistics; |
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/** |
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* Servlet implementation class TimetableServlet |
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*/ |
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public class TimetableServlet extends HttpServlet { |
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private static final long serialVersionUID = 1L; |
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Logger logger = Logger.getLogger( TimetableServlet.class.getName() ); |
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TimetableFetcher fetcher; |
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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 useTempSite = Boolean.parseBoolean( getServletContext().getInitParameter("usetempsite") ); |
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int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") ); |
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logger.info( "TimetableServlet, use temp site=" + useTempSite + ", cache=" + cacheTimeout); |
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fetcher = new TimetableFetcher(useTempSite,cacheTimeout); |
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} |
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@Override |
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { |
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if (request.getParameter("train") == null) { |
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response.sendError(400, "not enough parameters (train)"); |
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return; |
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} |
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if (request.getParameter("type") == null) { |
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response.sendError(400, "not enough parameters (type)"); |
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return; |
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} |
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Statistics.getInstance().incrementTimetableLookups(); |
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String train = request.getParameter("train").trim(); |
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String type = request.getParameter("type").trim(); |
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try |
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{ |
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List<TimetableBean> timetable = fetcher.cachedLookupTimetable(train, type); |
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String responseXML = formatTimetable(timetable); |
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response.setContentType("text/xml"); |
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response.getWriter().print(responseXML); |
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} catch (java.io.IOException ioe) { |
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logger.warning("(timetable) Read failed, type=" + type + ", train="+train + ". " + ioe.getMessage()); |
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Statistics.getInstance().incrementTimetableErrors(); |
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response.sendError(500, "Backend timed out"); |
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} catch (CircuitBreakerException cbe) { |
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logger.warning("Circuitbreaker - failing fast"); |
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Statistics.getInstance().incrementTimetableErrors(); |
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response.sendError(500); |
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}catch (Exception e) { |
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logger.log(Level.WARNING, "failure looking up timetable: type=" + type + ",train=" +train, e); |
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Statistics.getInstance().incrementTimetableErrors(); |
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response.sendError(500); |
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} |
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} |
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String formatTimetable(List<TimetableBean> timetable) { |
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StringBuffer sb = new StringBuffer(); |
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sb.append("<timetable>"); |
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for (TimetableBean bean : timetable) { |
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sb.append("<entry"); |
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if (bean.isCurrent()) |
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sb.append(" current=\"true\""); |
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sb.append(">"); |
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sb.append("<station>").append( bean.getStation() ).append("</station>"); |
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sb.append("<arrival>").append( bean.getArrival() ).append("</arrival>"); |
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sb.append("<departure>").append( bean.getDeparture() ).append("</departure>"); |
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sb.append("<stationid>").append( bean.getStationId() ).append("</stationid>"); |
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sb.append("</entry>"); |
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} |
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sb.append("</timetable>"); |
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return sb.toString(); |
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} |
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} |