traininfoservice/banedk/TimetableServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

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

import dk.thoerup.circuitbreaker.CircuitBreakerException;

/**
 * Servlet implementation class TimetableServlet
 */
public class TimetableServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
       
        
        Logger logger = Logger.getLogger( TimetableServlet.class.getName() );
        
        TimetableFetcher fetcher;
        
        @Override
        public void init() throws ServletException {
                super.init();
                
                boolean useTempSite =  Boolean.parseBoolean( getInitParameter("usetempsite") );
                logger.info( "TimetableServlet, use temp site=" + useTempSite );
                fetcher = new TimetableFetcher(useTempSite);
        }
        
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                if (request.getParameter("train") == null) {
                        response.sendError(400, "not enough parameters");
                        return;
                }
                
                String train = request.getParameter("train").trim();
                
                String sections[] = train.split(" ");
                if (sections.length != 2) {
                        response.sendError(400, "Invalid parameter");
                        return;
                }
                
                String type = lookupType(sections[0]);
                String trainID = sections[1];
                try
                {
                        List<TimetableBean> timetable = fetcher.cachedLookupTimetable(trainID, type);
                
                        String responseXML = formatTimetable(timetable);
                
                        response.setContentType("text/xml");
                        response.getWriter().print(responseXML);
                } catch (java.io.IOException ioe) {
                        logger.warning("(timetable) Read failed, train="+train + ". " + ioe.getMessage());
                        response.sendError(500, "Backend timed out");
                } catch (CircuitBreakerException cbe) {
                        logger.warning("Circuitbreaker - failing fast");
                        response.sendError(500);
                }catch (Exception e) {
                        logger.log(Level.WARNING, "failure looking up timetable: train=" +train, e);
                        response.sendError(500);
                }
                
        }
        
        String lookupType(String trainCode) {
                trainCode = trainCode.toLowerCase();
                
                if (trainCode.equals("a") || trainCode.equals("b") || trainCode.equals("bx") || trainCode.equals("c") || 
                                trainCode.equals("e") || trainCode.equals("f") || trainCode.equals("h")) {
                        return "S2";
                } else {
                        return "FJRN";
                }
        }
        
        String formatTimetable(List<TimetableBean> timetable) {
                StringBuffer sb = new StringBuffer();
                
                sb.append("<timetable>");
                
                for (TimetableBean bean : timetable) {
                        sb.append("<entry");
                        if (bean.isCurrent())
                                sb.append(" current=\"true\"");
                        sb.append(">");
                        
                        sb.append("<station>").append( bean.getStation() ).append("</station>");
                        sb.append("<arrival>").append( bean.getArrival() ).append("</arrival>");
                        sb.append("<departure>").append( bean.getDeparture() ).append("</departure>");
                        
                        sb.append("</entry>");
                }
                
                sb.append("</timetable>");
                
                return sb.toString();
        }

}
1	torben	350	package dk.thoerup.traininfoservice.banedk;
2
3			import java.io.IOException;
4			import java.util.List;
5	torben	378	import java.util.logging.Level;
6	torben	350	import java.util.logging.Logger;
7
8			import javax.servlet.ServletException;
9			import javax.servlet.http.HttpServlet;
10			import javax.servlet.http.HttpServletRequest;
11			import javax.servlet.http.HttpServletResponse;
12
13	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
14	torben	421
15	torben	350	/**
16			* Servlet implementation class TimetableServlet
17			*/
18			public class TimetableServlet extends HttpServlet {
19			private static final long serialVersionUID = 1L;
20
21
22			Logger logger = Logger.getLogger( TimetableServlet.class.getName() );
23
24	torben	581	TimetableFetcher fetcher;
25	torben	350
26	torben	425	@Override
27	torben	581	public void init() throws ServletException {
28			super.init();
29
30			boolean useTempSite = Boolean.parseBoolean( getInitParameter("usetempsite") );
31			logger.info( "TimetableServlet, use temp site=" + useTempSite );
32			fetcher = new TimetableFetcher(useTempSite);
33			}
34
35			@Override
36	torben	350	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
37	torben	458	if (request.getParameter("train") == null) {
38			response.sendError(400, "not enough parameters");
39			return;
40			}
41
42	torben	350	String train = request.getParameter("train").trim();
43
44			String sections[] = train.split(" ");
45			if (sections.length != 2) {
46			response.sendError(400, "Invalid parameter");
47			return;
48			}
49
50			String type = lookupType(sections[0]);
51			String trainID = sections[1];
52			try
53			{
54	torben	387	List<TimetableBean> timetable = fetcher.cachedLookupTimetable(trainID, type);
55	torben	350
56			String responseXML = formatTimetable(timetable);
57
58			response.setContentType("text/xml");
59			response.getWriter().print(responseXML);
60	torben	462	} catch (java.io.IOException ioe) {
61			logger.warning("(timetable) Read failed, train="+train + ". " + ioe.getMessage());
62	torben	378	response.sendError(500, "Backend timed out");
63	torben	421	} catch (CircuitBreakerException cbe) {
64			logger.warning("Circuitbreaker - failing fast");
65			response.sendError(500);
66	torben	451	}catch (Exception e) {
67	torben	378	logger.log(Level.WARNING, "failure looking up timetable: train=" +train, e);
68			response.sendError(500);
69	torben	350	}
70
71			}
72
73			String lookupType(String trainCode) {
74			trainCode = trainCode.toLowerCase();
75
76			if (trainCode.equals("a") \|\| trainCode.equals("b") \|\| trainCode.equals("bx") \|\| trainCode.equals("c") \|\|
77			trainCode.equals("e") \|\| trainCode.equals("f") \|\| trainCode.equals("h")) {
78			return "S2";
79			} else {
80			return "FJRN";
81			}
82			}
83
84			String formatTimetable(List<TimetableBean> timetable) {
85			StringBuffer sb = new StringBuffer();
86
87			sb.append("<timetable>");
88
89			for (TimetableBean bean : timetable) {
90			sb.append("<entry");
91			if (bean.isCurrent())
92			sb.append(" current=\"true\"");
93			sb.append(">");
94
95			sb.append("<station>").append( bean.getStation() ).append("</station>");
96			sb.append("<arrival>").append( bean.getArrival() ).append("</arrival>");
97			sb.append("<departure>").append( bean.getDeparture() ).append("</departure>");
98
99			sb.append("</entry>");
100			}
101
102			sb.append("</timetable>");
103
104			return sb.toString();
105			}
106
107			}